TERASAKI TemPower AR650S User manual

KRB-5331g
INSTRUCTION MANUAL FOR AIR CIRCUIT BREAKERS
(With Draw-out Cradle and Type AGR-11B Overcurrent Protective Device)
Types: AR650S,AR663S,AR663H
Notice
Be sure to read this manual before installing, operating, servicing, or inspecting the ACB.
Please retain this manual for future reference.
Electrical work must be done by competent persons.
ACB maintenance, inspection, parts replacement, OCR field tests and setting changes must be
performed by competent persons.

KRB-5331g
1. SAFETY NOTICES 5
2. RECEIVING AND HANDLING 7
2-1. Transportation Precautions 7
2-1-1. Transporting the ACB 7
2-1-2. Transporting the breaker body 8
2-1-3. Transporting the draw-out cradle 9
2-2. Storage Precautions 10
2-3. Installation Precautions 10
3. GENERAL 14
3-1. Types and Descriptions 14
3-2. Parts and Functions 17
3-3. Circuits and Ratings 21
4. OPERATION 25
4-1. Charging and Opening operation 25
4-1-1. Charging operation 25
4-1-2. Closing operation 26
4-1-3. Opening operation 26
4-1-4. Motion of trip indication and spring charge
indication switches 26
4-1-5. Motion of operation mechanisms 27
4-2. Draw-out and Insertion Operation 29
4-2-1. General 29
4-2-2. Draw-out operation 30
4-2-3. Putting the breaker body back into the draw-out
cradle 31
4-2-4. Contact status of auxiliary and position switches 33
4-3. ON-OFF Button Cover Locking Procedure 33
4-4. Lock in OFF Procedure 34
4-5. Position Lock Lever Locking Procedure 34
4-6. Breaker Fixing Bolt Securing Procedure 35
4-7. OCR Cover Locking Procedure 35
5. OVERCURRENT RELEASE (OCR) 36
5-1. Specifications 36
5-2. Characteristics 37
5-2-1. L characteristic for general feeder 37
5-3. OCR Setting Procedure 39
5-4. Operation Indication 40
6. MAINTENANCE, INSPECTION AND PARTS
REPLACEMENT 41
6-1. Inspection Procedures 42
6-2. Parts Replacement Procedure 45
6-2-1. Preparation 45
6-2-2. Arc chambers 48
6-2-3. Stationary arc contact and moving arc contact 49
6-2-4 Latch release coil (LRC) 51
6-2-5. Shunt trip device (SHT) 52
6-2-6. Control relay 53
6-2-7. Magnet hold trigger (MHT) 56
6-2-8. Auxiliary switches 57
7. TROUBLESHOOTING FLOWCHARTS 59
TABLE OF CONTENTS

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1. SAFETY NOTICES
Thank you for purchasing the TERASAKI AR-series Air Circuit Breaker (TemPower2).
This chapter contains important safety information.7
Be sure to carefully read these safety notices, instruction in this manual, and other documents accompanying the Air Circuit Breaker
(hereinafter referred to as the ACB) to familiarize yourself with safe and correct procedures or practices before installing, operating,
or servicing the ACB.
In this manual, safety notices are divided into “DANGER” and “CAUTION” according to the hazard level:
DANGER : A danger notice with this symbol indicates a potentially hazardous situation which, if not avoided, could result
in death or serious injury.
CAUTION : A caution notice with this symbol indicates a potentially hazardous situation which, if not avoided, may result in
minor or moderate injury and/or property damage.
Note that failure to observe a caution notice could result in serious injury/damage in some situations. Because safety notices contain
important information, be sure to read and observe them.
Transportation Precaution
DANGER
 Never stand under the ACB that has been lifted or suspended by a lifter or lifting attachments. The weight of the ACB may
cause serious injury.
Installation Precautions
CAUTION

Electrical work must be done by competent persons.
Do not place the ACB in such an area that is subject to high temperatures, high humidity, dusty air, corrosive gases, strong
vibration and shock, or other unusual conditions. Mounting the ACB in such an area could cause a fire or malfunction.
Be careful to prevent foreign objects (such as debris, concrete powder, dust, chippings, and iron powder) and oil or rainwater
from entering the ACB. These materials inside the ACB could cause a fire or malfunction.
Prior to commencing any work on the ACB, open an upstream circuit breaker or the like to isolate all sources of
power/voltage. Otherwise, electric shock may result.
Fix the draw-out cradle of the ACB firmly on a flat, level surface using mounting screws. Otherwise, the draw-out operation
may cause the breaker body or the draw-out cradle to fall, resulting in damage to the ACB or personal injury.
Lower the breaker body onto a flat, level surface. Otherwise, the breaker body to fall, resulting in damage to the ACB
personal injury.
Take care not to deform or bend protrusions in the bottom face of the draw-out cradle when fixing the draw-out cradle with
mounting screws. Deformation of the protrusions may cause a malfunction.
Connect conductors (including screws) to the main circuit terminals in the specified area. Otherwise, a short-circuit may
result.
When terminating conductors to the ACB, tighten terminal screws to the torque specified in this manual. Otherwise, a fire
could result.
For 4-pole ACBs, be sure to connect a 3-phase, 4-wire neutral conductor to the N-phase pole (on the right end). Otherwise, an
overcurrent may hinder the ACB from tripping, resulting in a fire.
Operation Precautions
DANGER
 Never touch live terminal parts. Doing so will result in electric shock.
Do not leave the ACB body in the draw-out position. If the ACB body is accidentally dropped, its weight may cause serious
injury.

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Operation Precautions (continued)
CAUTION

Do not force down the charging handle after completion of manual charging operation. Doing so may cause a malfunction.
The permissible operating voltage of the spring charging motor is 85 to 110% of the rated ac voltage or 75 to 110% of the
rated dc voltage. Be sure to supply a voltage within the above ranges to the motor. Otherwise, a malfunction, burnout, or fire
may result.
Repeated open/close operation by the motor charging mechanism without pause should not exceed 15 times. If repeated
continuous open/close operation is inevitable, a pause of at least 20 minutes should be provided after the repetitions of 15
times. Otherwise, a spring charging motor may be burnt out.
Do not bring your hand or face close to arc gas vent of the arc chamber while the ACB is closed. Otherwise, a burn may result
from high-temperature arc gas blowing out of the arc gas vent when the ACB trips open.
If the ACB trips open automatically, remove the cause of tripping operation before re-closing the ACB. Otherwise, a fire
could result.
If the ACB has the breaker fixing bolts, be sure to loose the fixing bolts before draw-out operation. Otherwise, damage to the
ACB may result.
Make sure the draw-out cradle is secured with mounting screws before inserting or drawing out the breaker body. Otherwise,
the insertion or draw-out operation may cause the breaker body or the draw-out cradle to fall, resulting in damage to the ACB
or personal injury.
When retracting the draw-out rail into the draw-out cradle, be sure to push the rail end. Do not hold the hook pin, body
stopper, or body stopper shaft. Doing so may cause your fingers to be pinched, resulting in injury.
Do not forcedly turn the draw-
out handle clockwise when the breaker body is in the “CONN.” position. Doing so may cause a
malfunction.
If the ACB has the breaker fixing bolts, make sure the bolts on both sides are securely tightened before using the ACB.
Loosened fixing bolts may cause a malfunction of the ACB, in particular when it is installed in such an area that is subject to
strong vibrations.
OCR (Overcurrent Release) Handling Precautions
CAUTION
 OCR setting changes must be performed by competent persons.
After setting changes are made, the settings be checked with e.g., a type ANU-1 OCR checker (optional).
After completion of OCR tests, be sure to return the settings to the original values. Failure to do so may cause a fire or
burnout.
Before changing OCR settings, open the ACB and then lock the OFF button to prevent the ACB from being closed
inadvertently.
Use a small flatblade screwdriver with a torque of
not more than 0.1 N·m or a force of not more than 0.1 N when adjusting the
setting switches (rotary step switches or slide switches). An excessive torque or force may cause a malfunction.
Maintenance and Inspection Precautions
CAUTION

ACB maintenance, inspection and parts replacement must be performed by competent persons.
Do not touch ACB current carrying parts and ACB structural parts close to a current carrying part immediately after the ACB
trips open. Remaining heat may cause a burn.
Prior to commencing any work on the ACB, open an upstream circuit breaker or the like to isolate all sources of
power/voltage from the main and control circuits. Otherwise, electric shock may result.
Take care to avoid adhesion of dust to main and control circuit contacts. Dust on the contacts may result in a fire.
Prior to commencing maintenance, inspection, or parts replacement, make sure that the closing springs are released and the
ACB is open. Otherwise, unintentional open/close operation may lead to fingers or tools to be pinched by the open/close
mechanism, resulting in injury.
Retighten the terminal screws periodically to the specified torque. Otherwise, a fire could result.
When grinding a contact tip, be careful to prevent grinding dust from entering the breaker operating mechanism. Wipe the tip
clean after grinding. Otherwise, a malfunction or fire could result.
Do not perform dielectric withstand tests under other conditions than specified. Doing so may cause a malfunction.
Be sure to reinstall the arc chamber
if removed. Failure to do so or incorrect installation of the arc chamber may result in a fire
or burn.
When charging the closing springs or performing open/close operation of the ACB with the arc chamber, front cover and/or
side covers removed during maintenance or inspection work, do not touch parts other than those required for the above
operation (charging handle, ON/OFF buttons, moving core and the like). Doing so may cause fingers or tools to be pinched,
resulting in injury.
When replacing an auxiliary, do not damage the control wire for the auxiliary or pinch the wire between the auxiliary and the
breaker body. Doing so may cause a malfunction.

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Breaker body
Breaker fixing bolt
Control circuit terminals
Auxiliary switches
Control terminal
block cover
Lifting hole (ø20mm)
Arc gas barrier
2. RECEIVING AND HANDLING
Upon receipt of your ACB, check the following. If you have any question or problem, contact us at the indicated on the back cover
of this manual.
Check that the ACB received is as ordered and that the accessories are as specified.
Check that the ACB is not damaged during shipment.
2-1. Transportation Precautions
DANGER
 Never stan
d under the ACB that has been lifted or suspended by a lifter or lifting attachments. If the ACB body is accidentally
dropped, its weight may cause serious injury.
2-1-1. Transporting the ACB
Before transporting the ACB, make sure the breaker body is in the CONN. position. If the ACB has breaker fixing bolts, make
sure the breaker body is secured to the draw-out cradle with the fixing bolts.
When lifting the ACB, hold it using lifting attachments or wire ropes through the lifting holes. Take care that the control circuit
terminals, auxiliary switches, arc gas barrier and control terminal block cover which are shown in Fig. 1 are not damaged by the
lifting rope. Lift the ACB carefully and gently. For transportation, place the ACB on a pallet and carry slowly and carefully.
Avoid shock and vibration to the ACB during transportation.
Do not lay the ACB during transportation.
When transporting the ACB over great distances, crate it for protection against shock and vibration and secure the crate package
with wood or ropes.
When transporting the ACB while it is installed in a switchboard, you should fix the breaker body in the draw-out cradle with the
breaker fixing bolts (optional).
Lower the ACB onto a flat, level surface.
*When lifting the ACB, the length of the rope
do not be beyond the range of the angle to
show in figure.
Front view
Rear view
Fig. 1 Transporting the ACB
ACB Lifting attachment
Rope

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Control circuit contact
Breaker body Lifting attachment
Lifting plate
Rope
2-1-2. Transporting the breaker body
Use an optional lifter or lifting plate to transfer the breaker body.
When transporting the breaker body on a lifter, move the lifter with the lifter fork held at the lowest possible position.
Lower the breaker body onto a flat, level surface. Otherwise, the breaker body to fall, resulting in damage to the ACB personal
injury.
Take care not to exert forces on the front cover and the control circuit contacts shown in Fig. 2 . Otherwise, a deformation or
damage may result.
Front view
Rear view
*When lifting the breaker body, the length of the rope do
not be beyond the range of the angle to show in figure.
Fig. 2 Transporting the breaker body
Front cover
Lifting plate

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Control circuit terminals
Auxiliary switches
Control circuit contacts
Control terminal block cover
Arc gas barrier
Lifting hole (ø20mm)
Draw-out arm
2-1-3. Transporting the draw-out cradle
When transporting the draw-out cradle, hold it using lifting attachments or wire ropes through the lifting holes or carry it by the
portions (4 points) marked with the arrows shown in Fig 3. When carrying the draw-out cradle, take care not to exert forces on the
arc gas barrier, the draw-out arm, the auxiliary switches, the control circuit terminals, the control terminal block cover, and the
control circuit contacts.
Front view
Rear view
*When lifting the draw-out cradle, the length of the rope do
not be beyond the range of the angle to show in figure.
Fig. 3 Transporting the draw-out cradle
Draw-out cradle Lifting attachment
Rope

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2-2. Storage Precautions
It is recommended that the ACB be used as soon as you have received it. If it is necessary to store the ACB, note the following:
Store the ACB in a dry indoor location to prevent condensation due to sudden changes in ambient temperature. Condensation has
a harmful effect on the ACB insulation.
Store the ACB in a clean place free of corrosive gases and dust. In particular, exposure to a mixture of moisture and cement dust
may cause corrosion damage to metal parts of the ACB.
Place the ACB on a flat, level surface in its normal position (Do not lay the ACB).
Do not place the ACB directly on the floor. Do not stack the ACBs during storage.
2-3. Installation Precautions
CAUTION

Electrical work must be done by competent persons.
Do not place the ACB in such an area that is subject to high temperatures, high humidity, dusty air, corrosive gases, strong
vibration and shock, or other unusual conditions. Mounting the ACB in such an area could cause a fire or malfunction.
Be careful to prevent foreign objects (such as debris, concrete powder, dust, chippings, and iron powder) and oil or rainwater
from entering the ACB. These materials inside the ACB could cause a fire or malfunction.
Prior to commencing any work on the ACB, open an upstream circuit breaker or the like to isolate all sources of
power/voltage. Otherwise, electric shock may result.
Fix the draw-out cradle of the ACB firmly on a flat, level surface using mounting screws. Otherwise, the draw-out operation
may cause the breaker body or the draw-out cradle to fall, resulting in damage to the ACB or personal injury.
Take care to put the breaker body on a flat, level surface. Otherwise, the breaker body to fall, resulting in damage to the ACB
personal injury.
Take care not to deform or bend protrusions in the bottom face of the draw-out cradle when fixing the draw-out cradle with
mounting screws. Deformation of the protrusions may cause a malfunction. (see Fig. 4)
Connect conductors (including screws) to the main circuit terminals in the specified area. Otherwise, a short-circuit may
result.
When terminating conductors to the ACB, tighten terminal screws to the torque specified in this manual. Otherwise, a fire
could result.
For 4-pole ACBs, be sure to connect a 3-phase, 4-wire neutral conductor to the N-phase pole (on the right end). Otherwise, an
overcurrent may hinder the ACB from tripping, resulting in a fire.
Fig. 4 Protrusion on the bottom of the draw-out cradle
Do not install the ACB in such an area that is exposed to direct sunlight.
Make sure that the mounting base has a sufficient capacity of bearing the weight of the ACB (see Table 3 and Table 4). The
mounting base must be protected against vibration. Take appropriate measures to provide a perfect protection to the mounting
base against resonance. Otherwise, open/close operation of the ACB may cause a malfunction of other devices in the switchboard
or vibrations of the switchboard may cause a malfunction of the ACB.
Draw-out cradle mounting screws
Hex head M12 (4) (not supplied)
with spring washer, flat washers (2)
and nut
Tightening torque: 41 - 52 N·m
Draw-out cradle
mounting screw hole
Protrusion

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Use the following screws with appropriate length for the main circuit terminals.
Main circuit terminal screws: Hex head M10, with flat washers (2), spring washer (1) and nut (1) per screw
Tightening torque: 22.5 - 37.2 N·m
Table 1 Number of main circuit terminal screws required
ACB type AR650S, AR663S, AR663H
Number of main circuit
terminal screws
(3/4-pole)
Vertical terminals 48/64
Horizontal terminals*36/48
Use the following screw for the ground terminal. The screw must have a length that allows it to be inserted 4 - 9 mm into the
ground terminal M8 tapped hole.
Ground terminal screw: M8 (1) with spring washer and flat washer
Tightening torque: 11.8 - 14.7 N·m
Connect conductors to the main circuit terminals in the conductor connection area as shown in Fig. 5.
●Vertical terminals, 3 Poles
Right side view Back view
●Vertical terminals, 4 Poles
Right side view Back view
Fig. 5 Conductor (include screw) connection area

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ACB
Support
Conductor
ACB
Support
Conductor
Use a support to hold conductors securely at distance L as shown in Fig. 6 and Table 2. Such a support will help preventing the
conductors and main circuit terminals from being deformed or damaged due to a large electromagnetic force caused by any fault
current.
Table 2 Distance L
Short-circuit current (kA) 30 50 65 80 100 120 135
Distance
L (mm) Type AR650S,663S,663H 350 300 250 150 150 150 150
Fig. 6 Support mounting
The following procedure makes it easy to make connections with screw terminals of position switches, control circuit terminals,
and auxiliary switches.
(1) Draw out the breaker body to the removed position, and remove it using an optional lifter or lifting plate. Refer to sections 4-2-2
and 2-1-2.
(2) If the ACB is equipped with the control terminal block cover, loosen both the cover fixing screws shown in Fig.10 and remove
the cover.
(3) Remove the control circuit terminals fixing screws shown in Fig. 7.
Fig. 7 Control circuit terminals fixing screws
(4) Remove the terminal block fixing screws shown in Fig. 8.
Fig. 8 Terminal block fixing screws
Terminal block fixing screws
Hex head M6 x 10 (4) (red),
with spring washer and
flat washer
Tightening torque: 4.7 - 5.9 N·m
Auxiliary switches
Control circuit terminals
Control circuit terminals
fixing screw
Pan head M4 x 8 (2) (red),
with spring and flat washer
Tightening torque: 1.3 - 1.7 N·m

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(5) Tilt the terminal block down as shown in Fig. 9. After connecting wires, tilt the terminal block up again and fix it with the
terminal block fixing screws.
Fig. 9 Terminal block tilted down
If any work is done near the ACB that have been installed, protect the openings of the ACB with appropriate covers to prevent
spatters, metal chips, wire cuttings or other foreign objects from entering the ACB.
Auxiliary switch terminal screw
(Control terminal screw)
(Position switch terminal screw)
Pan head M4 x 8,
with spring washer and terminal
washer
Tightening torque: 1.3 - 1.7 N·m

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3. GENERAL
3-1. Types and Descriptions
TemPower2is available in types shown in Tables 3 and 4.
Table 3 Standard types
Frame size (A) 5000 6300
Type
AR650S
AR663S
Max. rated current [In] (A) *1 IEC, EN, AS 5000 6300
Marine use
6300
N-phase rated current (A) 5000 6300
Number of poles *2, *3
3
4
3
4
Dielectric withstand voltage [U
i
] (50/60Hz) 1000 1000
Operating voltage [Ue] (50/60Hz)
690
690
Rated breaking/making current [kA sym rms/kA peak]
IEC ,EN, AS [ICS = ICU]
JIS C 8201-2-1 Ann.1 Ann.2
AC 690V *585/187
AC 500V 120/264
AC 440V
NK *4 AC 690V 85/201
AC 450V
120/287
For DC DC 600V *640/40
DC 250V
Rated short-time current [ICW] [kA rms] 1 sec. 120
3 sec.
85
Rated latching current (kA) 120
Endurance
in number of
ON-OFF cycles
*7
Mechanical
With maintenance
10000
Without maintenance 5000
Electrical
Without
mainte-n
ance
AC 460V 1000
AC 690V 500
Installation Draw-out type
Mass (kg) 200 260 220 285
External dimensions (mm)
a
799
1034
799
1034
b 460
c
380
d 60
Connection method
Line side
Vertical terminals
Load side Vertical terminals
Control circuit terminal type
screw terminals
Spring charging method Manual or motor charging
Overcurrent release (OCR)
No OCR, or L-characteristic for general feeder protection
Operation indication Group indication
Tripping device
Tripping coil
(TC)
Standard equipment for OCR-equipped ACB
Shunt trip device
(SHT) Optional
undervoltage trip
device (UVT)
Optional
Auxiliary switches Number of switches 4C (standard), 7C or 10C; available for general feeder or microload
Terminal type
screw terminals
Operation power*8 Rated voltage
AC100V, AC110V, AC120V, AC200V, AC220V, AC240V, DC24V,
DC48V, DC100V, DC110V, DC125V, DC200V or DC220V
*1: Ambient temperature: 40°C (45°C for marine used)）
*2: For 2-pole applications, use two poles at both ends.
*3: 4-pole ACBs are not applicable to power distribution IT systems unless N-phase protection is provided.
*4: Applicable to 3-pole ACBs
*5: For applicability to power distribution IT systems, consult us
*6: Applicable under 3-pole serial connection scheme.
*7: Expected service life based on endurance test. The service life of ACB depends on the working and environmental conditions. Refer to chapter 6 “Maintenance, Inspection and
Parts Replacement”.
*8: For more information, please refer to page 22.

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Table 4 High-performance types
Frame size (A)
6300
Type AR663H
Max. rated current [In] (A) *1
IEC, EN, AS
6300
Marine use
6300
N-phase rated current (A) 6300
Number of poles *2, *3
3
4
Dielectric withstand voltage [Ui] (50/60Hz)
1000
Operating voltage [U
e
] (50/60Hz) 690
Rated breaking/making current [kA sym rms/kA peak] *4
IEC ,EN, AS [ICS = ICU]
JIS C 8201-2-1 Ann.1 Ann.2
AC 690V *6
85/187
AC 500V 135/297
AC 440V
NK *5
AC 690V
85/201
AC 450V 138/322
For DC
DC 600V *7
40/40
DC 250V
Rated short-time current [ICW] [kA rms] 1 sec.
135
3 sec.
85
Rated latching current (kA)
120
Endurance
in number of
ON-OFF cycles
*8
Mechanical With maintenance 10000
Without maintenance
5000
Electrical
Without
mainte-n
ance
AC 460V 1000
AC 690V 500
Installation Draw-out type
Mass (kg) for draw-out type
220
285
External dimensions (mm)
a 799 1034
b
460
c
380
d 60
Connection method
Line side
Vertical terminals
Load side
Vertical terminals
Control circuit terminal type screw terminals
Spring charging method
Manual or motor charging
Overcurrent release (OCR)
No OCR, or L-characteristic for general feeder protection
Operation indication Group indication
Tripping device
Tripping coil
(TC)Standard equipment for OCR-equipped ACB
Shunt trip device
(SHT)
Optional
U
ndervoltage trip
device (UVT) Optional
Auxiliary switches Number of switches
4C (standard), 7C or 10C; available for general feeder or
microload
Terminal type
screw terminals
Operation power*9 Rated voltage
AC100V, AC110V, AC120V, AC200V, AC220V, AC240V,
DC24V, DC48V, DC100V, DC110V, DC125V, DC200V or
DC220V
*1: Ambient temperature: 40°C (45°C for marine used)
*2: For 2-pole applications, use two poles at both ends.
*3: 4-pole ACBs are not applicable to power distribution IT systems unless N-phase protection is provided.
*4: Setting the instantaneous trip function to NON reduces the rated breaking current to the rated latching current.
*5: Applicable to 3-pole ACBs
*6: For applicability to power distribution IT systems, consult us
*7: Applicable under 3-pole serial connection scheme.
*8: Expected service life based on endurance test. The service life of ACB depends on the working and environmental conditions. Refer to chapter 6 “Maintenance, Inspection and
Parts Replacement”.
*9: For more information, please refer to page 22.
Use the ACBs in the environmental conditions specified in Table 5.
Table 5 Operating environment
Standard
environment
(Standard equipped
ACBs)
Altitude 2000 m max.
Ambient temperature -5°C to +40°C The average temperature for 24 hours must not exceed 35°C
Humidity 45 to 85% rel. max.
Vibration 0.7G max.
Shock 200 m/s
2
(20G) max.
Atmosphere
No excessive water vapor, oil vapor, dust, or corrosive gases. No sudden change in temperature and no condensation.
Ammonia (NH3): 0.5 ppm max, Hydrogen sulfide (H2S)/sulfur dioxide (SO2)/hydrogen chloride (HCl): 0.1 ppm max.,
Chlorine (Cl2): 0.05 ppm max.
Special
environment
(Optional)
Tropical environment
package
Different from standard ACBs in that Ambient temperature: 60°C max. and Humidity: 95% rel. max. (no condensation)
Cold environment
package Different from standard ACBs in that Ambient temperature: -25°C min. for use and -40°C min. for storage (no condensation)
Corrosion-resistant
package
Different from standard ACBs in that NH3: 50 ppm max, H2S: 10 ppm max., SO2/HCl: 5 ppm max., and Cl2: 1 ppm max.

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Table 6 shows the dielectric withstand voltage and the insulation resistance of the ACBs.
CAUTION
 Do not perform dielectric withstand/insulation resistance tests under other conditions than specified. Doing so may cause a
malfunction.
Table 6 Dielectric withstand voltage and insulation resistance
Circuit Dielectric withstand voltage (50/60Hz) Impulse withstand
voltage Uimp
Insulation
resistance
(DC500V Megger
used)
Main circuit
Between poles, and terminal group and ground
AC3500V
1 minute
12kV
300M
Ω
Control circuit
Auxiliary
switches
For general feeder
Between terminal group and ground
AC2500V
1 minute
6kV
100MΩ
For microload
Between terminal group and ground
AC2000V
1 minute
4kV
100M
Ω
Position switches
Between terminal group and ground
AC2000V
1 minute
4kV
100MΩ
Overcurrent release
Between terminal group and ground
AC2000V
1 minute
4kV
100M
Ω
Undervoltage trip device,
Reverse power trip device Between terminal group and ground AC2500V 1 minute 6kV 100MΩ
Other accessories
Between terminal group and ground
AC2000V
1 minute
4kV
100M
Ω
The above data applies to new ACBs. Device terminals within ACBs are not covered. Use a DC500V Megger to measure the insulation resistance.
Table 7 shows the internal resistance and power consumption of the ACBs.
Table 7 Internal resistance and power consumption
Type
AR650S
AR663S
AR663H
Frame size (A)
5000
6300
6300
DC internal resistance (m
Ω
) (for 1-pole ACB)
0.012
0.010
0.010
AC power consumption (W) (for 3-pole ACB)
1620
1910
1910
Table 8 shows applicable current of the ACBs. The applicable current varies depending on the ambient temperatures.
Table 8 Dependence of applicable current on ambient temperature
Type
AR650S
AR663S
AR663H
Standard
Conductor size
Ambient
temperature (°C)
3 ×200 ×10t 4 ×200 ×10t 4 ×200 ×10t
IEC60947-2
EN60947-2
AS3947-2
JIS C8201-2-1
Ann.1 Ann.2
40 (standard ambient temperature)
5000
6300
6300
45
5000
6300
6300
50
4950
6000
6000
55
4710
5680
5680
60
4450
5370
5370
NEMA,SG-3
ANSI C37.13
40 (standard ambient temperature)
4700
5680
5680
45
4450
5370
5370
50
4180
5050
5050
55
3900
4710
4710
60
3610
4350
4350
JEC-160
40 (standard ambient temperature)
4300
5000
5000
45
4120
4750
4750
50
3940
4530
4530
55
3750
4310
4310
60
3540
4080
4080
Notes: The above values may vary depending on the switchboard configuration.

KRB-5331g
-17-
Control terminal block cover ◯
38
Front cover ◯
19
ON-OFF cycle counter ◯
16
Specification nameplate ◯
22
3-2. Parts and Functions
Fig. 10 provides a general views of the ACB.
◯
1ACB
◯
2Draw-out cradle
Fig. 10-1 General view and parts designation (front view)
OFF button ◯
4
ON-OFF button cover ◯
15
Lock-in-OFF plate
◯
14
◯
5ON button
◯
15 ON-OFF button cover
◯
6ON-
OFF indicator
◯
7Charge indicator
◯
39
Cover fixing
screw
Overcurrent release (OCR) ◯
18
OCR cover ◯
17
◯
21 Rating nameplate
◯
9Position indicator
◯
50 Draw-out handle
Position padlock lever ◯
13
Release button ◯
12
Draw-out handle
insertion hole ◯
11
Side cover◯
20
Breaker fixing bolt (red) ◯
29
Control circuit terminals ◯
37
Control circuit contact ◯
25
Main circuit contact ◯
24
Draw-out rail ◯
30
Draw-out rail end ◯
31
Rail stopper ◯
35
Protrusion ◯
49
Specification nameplate ◯
21
◯
47 Lifting hole (ø20mm, for
ACB + Draw-out cradle)
◯
48 Lifting hole (ø20mm, for
Draw-out cradle)
◯
40 Auxiliary switches
◯
41 Terminal block
◯
33 Body stopper
◯
32 Hook pin
◯
34 Body stopper shaft

KRB-5331g
-18-
◯
3Breaker body (rear view)
◯
2Draw-out cradle (rear view)
Fig. 10-2 General view and parts designation (rear view)
Arc chamber ◯
26
Main circuit contact ◯
24
Mold base ◯
28
◯
25 Control circuit contact
◯
27 Mold cover
◯
23 Breaker body roller
◯
36 Transport roller
◯
10 Grip
Gas exhaust port ◯
43
Arc gas barrier ◯
44
Main circuit terminal ◯
46
Breaker draw-out arm ◯
45
◯
42 Ground terminal M8 tapped hole

KRB-5331g
-19-
◯
1
ACB
Consists of breaker body
◯
3
and draw-out cradle
◯
2
.
◯
2
Draw-out cradle
Comes with main circuit terminals
◯
45
, control circuit terminals
◯
36
, auxiliary switches
◯
39
.
◯
3Breaker body Contains the ON-OFF mechanism, the closing coil，
the tripping device, and overcurrent
release ◯
18 .
◯
4
OFF button Push to open the ACB.
◯
5ON button Push to close the ACB.
◯
6ON-OFF indicator Shows “OFF” when the ACB is open and “ON” when it is closed.
◯
7Charge indicator Shows “CHARGED” when the closing springs are charged and “DISCHARGED” when it
is released.
◯
8
Charging handle
Pump to charge the closing springs.
◯
9
Position indicator Indicates the present breaker body position: CONN., TEST, or ISOLATED.
◯
10 Grip Hold to draw out the breaker body.
◯
11
Draw-out handle
insertion hole
Insert the draw-out handle into this hole to move the breaker body.
◯
12 Release button Push to move the breaker body from the TEST position.
◯
13 Position padlock
lever (optional)
Accommodates up to three padlocks to lock the breaker body in the CONN., TEST or
ISOLATED position. (Padlocks are not supplied. Use padlocks with a 6 mm-diameter
shackle.)
◯
14
Lock-in-OFF plate
(optional)
Padlocking this plate allows the ACB to be locked in the open (OFF) state. (Padlocks are
not supplied. Use padlocks with a 6 mm-diameter shackle.)
◯
15 ON-OFF button cover
Provides protection against inadvertent button operation and can be padlocked. (Padlocks
are not supplied. Use padlocks with a 6 mm-
diameter shackle.) Up to three padlocks can be
installed.
◯
16
ON-OFF cycle
counter (optional)
Reads the number of ON-OFF cycles. It counts a series of operations from close to open as
one cycle.
◯
17 OCR cover Padlocking this plate prevents settings of overcurrent release ◯
18
to be inadvertently
changed. (Padlocks are not supplied. Use padlocks with a 6 mm-diameter shackle.)
◯
18 Overcurrent release
(OCR)
This protective device is supplied power via the power CT installed in the ACB main
circuit. When the current sensor detects an overcurrent in the main circuit, the OCR
instructs the magnet hold trigger (MHT) to trip open the ACB.
◯
19 Front cover A plastic cover of the breaker body front panel.
◯
20 Side cover A metal cover of the breaker body front panel
◯
21
Rating nameplate
Indicates the type, applicable standards and rated breaking capacity of the ACB.
◯
22
Specification
nameplate
Indicates the number of poles, operation method, accessories, and serial number of the
ACB.
◯
23 Breaker body roller Allows breaker body ◯
3to be moved on draw-out rail ◯
30 .
◯
24
Main circuit contact
Closes when the breaker body is in the CONN. position.
◯
25
Control circuit
contact
Closes when the breaker body is in the CONN. or TEST position.
◯
26 Arc chamber
Extinguishes the arc that occurs in the breaking operation. Two arc chambers are fitted per
pole. See 6-2-2. "Arc chambers".
◯
27 Mold cover A plastic cover of the breaker body side face.
◯
28 Mold base A plastic cover of the breaker body rear face.
◯
29
Breaker fixing bolt
(red) (optional)
Allows the breaker body to be locked in the CONN. position even if the ACB is subject to
strong vibrations.
◯
30
Draw-out rail
Use to draw out the breaker body from the draw-out cradle.
◯
31
Draw-out rail end Refer to chapter 1 “Operation Precautions”.
◯
32 Hook pin Refer to chapter 1 “Operation Precautions”.
◯
33 Body stopper
Prevents the breaker body from falling when the body is drawn out from the draw-out
cradle.
◯
34 Body stopper shaft
Refer to chapter 1 “Operation Precautions”.
◯
35
Rail stopper (red) Allows the draw-out rail to be locked in the drawn-out or retracted state.
◯
36 Transport roller
Allows breaker body
◯
3
to be moved on horizontal surface. Breaker body moves to front
and back.

KRB-5331g
-20-
◯
37
Control circuit
terminals
Allow connections of external control wire to the control circuits. Wire connections are
made through M4 screw terminals. Fig. 11 shows the control circuit terminals.
Fig. 11 Control circuit terminals
◯
38
Control terminal
block cover (optional)
Protects the position switches, the control circuit terminals and the auxiliary switches from
damage.
◯
39 Cover fixing screw Secures the control terminal block cover.
◯
40 Auxiliary switches
(optional)
Indicate the state of the ACB (ON or OFF). The auxiliary switches are available in 4C
configuration (standard), or 7C or 10C configuration (optional). Connections to the
switches are made through M4 screw terminals.
◯
41
Terminal block Contains position switches, control circuit terminals ◯
36 , and auxiliary switches ◯ 39 .
◯
42
Ground terminal M8
tapped hole
Allows connection of a ground terminal.
◯
43 Gas exhaust port
Allows the arc gas to be discharged from arc chamber
◯
26
in a horizontal direction when
the ACB trips open.
◯
44 Arc gas barrier Prevents the arc gas from being discharged upwards from arc chamber ◯
26 when the ACB
trips open.
◯
45
Breaker draw-out arm
Is retracted in the draw-out cradle when the breaker body is in the CONN. position.
◯
46
Main circuit terminals Allow connections of external conductors.
◯
47
Lifting hole (ø20mm,
for ACB + Draw-out
cradle)
Allows lifting attachments or wire ropes to be used for lifting the ACB.
◯
48 Lifting hole (ø20mm,
for Draw-out cradle)
Allows lifting attachments or wire ropes to be used for lifting the Draw-out cradle.
◯
49
Protrusion
Refer to section 2-3. “Installation Precautions”.
◯
50
Draw-out handle
(removable) Use to draw out /insert the breaker body from/into the draw-out cradle.