TERASAKI AME Series User manual

KRB-5200h
Air Circuit Breakers
AME Series
Instruction Manual
Applicable Breaker Types:
AME3B
AME4B
AME6B
AME8B
AME10B
Please retain this manual for future reference.

KRB-5200h

KRB-5200h
INTRODUCTION
Thank you for purchasing the Terasaki AME Series Air Circuit Breaker for generator
protection (hereinafter referred to as the ACB).
Please read this manual thoroughly to ensure correct use of the ACB.
To Customers:
This manual is to be delivered to the user after completion of the installation work.
To Users:
Please keep this manual safely for later reference.
Safety Notices
Be sure to read this manual and other associated documents accompanying the product thoroughly to
be familiarize yourself with the product handling, safety information, and all other precautions before
mounting, using, servicing, or inspecting the product.
In this manual, safety notices are divided into "Warning" and "Caution" according to the hazard level:
Warning :
A warning notice with this symbol indicates that neglecting the suggested procedure or practice
could be fatal or result in serious personal injury.
Caution :
A caution notice with this symbol indicates that neglecting the suggested procedure or practice
could result in moderate or slight personal injury and/or property damage.
Note that failing to observe caution notices could result in serious injury/damage in some situations.
Because safety notices contain important information, be sure to read and observe them.
Operation Precautions See pages 13, 15, 18 and 19.
Warning
Never touch live terminal parts
Otherwise, electric shock may result.
Caution
If the ACB trips open automatically, remove the cause before closing the ACB.
Otherwise, a fire could result.

KRB-5200h
Installation Precautions See pages 4 to 8.
Warning
Be sure to open or trip the live ACB before mounting or dismounting it.
Otherwise, a fire or personal injury may result.
Never touch live parts or terminals when mounting or dismounting the live ACB.
Otherwise, electric shock may result.
Caution
Installation work must be performed by competent persons.
Prior to commencing any work on the ACB, stop the generator and open a disconnector or
the like to isolate all sources of power/voltage from both the primary and auxiliary circuits.
Otherwise, electric shock may result.
Be sure to bring the connecting conductors into close contact with the stud bar or the
plug-in mounting base terminal.
Otherwise, a fire could result.
When terminating conductors to the ACB, tighten terminal screws to the torque specified in
this instruction manual.
Otherwise, a fire could result.
Avoid blocking the arc gas vents of the ACB to ensure adequate arc space (insulation
distance).
Blocking the vents could result in failure of ACB tripping.
Do not place the ACB in such an area that is subject to high temperature, high humidity,
dusty air, corrosive gas, strong vibration and shock, or other unusual conditions.
Mounting in such areas could cause a fire, non-tripping, or malfunction.
Be careful to prevent foreign objects (debris, concrete powder, iron powder, etc.) and
rainwater from entering the ACB.
These materials inside the ACB could cause a fire or non-tripping.
Use both hands to support the ACB when mounting or dismounting it. A heavy ACB
should be carried by two persons.
Dropping or toppling the ACB may cause damage to it or personal injury.
OCR Field Tests Precautions See pages 20, 21, 23 and 25.
Caution
Field tests must be performed by competent persons.
Never touch live terminal parts.
Otherwise, electric shock may result.
For testing of characteristic by injection to terminal: Ka, Kb, Kc, l, injection current should
be cut off immediately after OCR is operated.
Maintenance and Inspection Precautions See page 28.
Caution
ACB maintenance, inspection and/or parts replacement must be performed by competent
persons.
Prior to commencing any work on the ACB, stop the generator and open a disconnector or
the like to isolate all sources of power/voltage from both the primary and auxiliary circuits.
Otherwise, electric shock may result.
Retighten the terminal screws periodically to the specified torque.
Otherwise, a fire could result.

KRB-5200h
Table of Contents
1. OUTERVIEW .........................................................................................................................................1
2. RECEIVINGANDHANDLING...................................................................................................................2
2.1 Unpacking Precautions...................................................................................................................2
2.2 Transportation Precautions.............................................................................................................2
2.3 Storage Precautions .......................................................................................................................2
3. INSTALLATION.......................................................................................................................................4
3.1 Installing Rear-Connected ACB......................................................................................................4
3.2 Installing Plug-in ACB.....................................................................................................................6
3.3 Connection and Specifications of Accessories...............................................................................9
3.3.1 Undervoltage Trip Device (UVT)..............................................................................................9
3.3.2 Shunt Trip Device (SHT)........................................................................................................10
3.3.3 Auxiliary Switch (AX) and Alarm Switch (AL).........................................................................11
3.3.4 Motor Operator.......................................................................................................................12
4. OPERATION.........................................................................................................................................13
4.1 Direct-Manual Operation...............................................................................................................13
4.2 External-Manual Operation...........................................................................................................15
4.3 Motorized Operation .....................................................................................................................17
4.3.1 Motorized Operator...................................................................................................................17
4.3.2 Manual Operation.....................................................................................................................19
5. OVERCURRENTTRIPDEVICE.............................................................................................................20
5.1 Setting Change .............................................................................................................................20
5.2 OCR Field Tests ...........................................................................................................................21
5.2.1 Tests with Current Applied to the Main Circuit ......................................................................21
5.2.2 Tests with Current Applied to the OCR Test Terminal ..........................................................23
5.2.3 Tests Using OCR Checker (type ANS1)................................................................................25
5.3 Operation Characteristic Curves...................................................................................................26
6. PRECAUTIONSONTEMPERATURE-RISETEST...................................................................................27
7. PRECAUTIONSONINSULATIONRESISTANCETESTANDDIELECTRICWITHSTANDVOLTAGETEST .27
7.1 Insulation Resistance Measurement.............................................................................................27
7.2 Dielectric Withstand Voltage Test.................................................................................................27
7.2.1 Main Circuit............................................................................................................................27
7.2.2 Auxiliary and Control Circuits.................................................................................................27
8. MAINTENANCEANDINSPECTION........................................................................................................28
8.1 Guideline of Inspection Interval ....................................................................................................28
8.2 Inspection Procedures..................................................................................................................29
9. TROUBLESHOOTING...........................................................................................................................31

KRB-5200h
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1. OUTER VIEW
Breaker nameplate
Auxiliary circuit
terminals
(for SHT or UVT)
OCR test terminals
Transparent OCR
cover
Trip button
Main circuit terminals
Handle
Auxiliary circuit
terminals
(for auxiliary/alarm
switch)
Seal for OCR cover
mounting screw
OCR nameplate
Accessory (motor
operator) nameplate
Breaker nameplate
Trip button
Control circuit
terminals
Main circuit terminals
Manual operating
handle
Auxiliary circuit
terminals
(for auxiliary/alarm
switch)
Indicator
Lock plate
Motor-operated AME4B
(rear-connected type)
Direct-operated AME6B
(rear-connected type)

KRB-5200h
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2. RECEIVING AND HANDLING
2.1 Unpacking Precautions
The ACB from Terasaki is completely assembled, inspected and tested both electrically and
mechanically at the factory, then shipped in fully guaranteed conditions in construction and
operation. Upon receipt of your ACB, check the following. If you have any question or any
problem, contact your local agent or our branch office.
1) Check that the ACB is not damaged during shipment.
Caution : During unpacking, do not lay the plug-in type ACB on a flat surface with the backside
down.
Doing so may cause damage to the auxiliary terminals.
2) Check that the ratings shown on the ACB nameplate, OCR nameplate, and accessory
nameplate are as you specified.
When the ACB is equipped with the XMD4M motor operator, remove the motor operator
before checking the OCR nameplates. The motor operator is hinged. For procedures for
removing and mounting the operator, see [3] Before and After Checking the Trip Settings,
XMD Series Motor Operator - Operating Instructions.
2.2 Transportation Precautions
1) Use both hands to transport the ACB. A heavy ACB should be carried by two persons.
Dropping or toppling the ACB may cause damage to it or personal injury.
ACB Mass (kg)
ACB type
Manual operated
Motor operated
Rear-connected
Plug-in
Rear-connected
Plug-in
AME3B, AME4B
6.5
5
11.2
9.7
AME6B
10
9.6
15.6
15.2
AME8B, AME10B
19.5
16
25.9
22.4
2) Do not carry the ACB by the auxiliary terminal block or stud bar.
Doing so may cause damage or dropping.
3) Avoid strong vibration or shock to the ACB during transportation or installation.
Otherwise, damage may result.
2.3 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 for some time before its installation, please note the following for proper storage:
1) Store the ACB in a dry indoor location to prevent condensation due to sudden changes in
temperature.
Condensation has a harmful effect on the ACB insulation.
2) Store the ACB in a clean place free of corrosive gases, dirt and dust. In particular, a mixture
of cement dust and moisture can cause corrosion in the various metal parts of the ACB, and
fully protect the ACB from such mixtures.
Floor
Terminal contacting with floor surface

KRB-5200h
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3) Place the ACB on a flat, level surface in its normal standing position.
(Do not turn the ACB sideways.)
4) Do not place the ACB directly on the floor.
5) Do not expose the ACB to direct sunlight for a long time.

KRB-5200h
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3. INSTALLATION
3.1 Installing Rear-Connected ACB
For details of ACB mounting dimensions, see the catalogue.
Caution
(1) Installation work must be performed by competent persons.
(2) Prior to commencing any work on the ACB, stop the generator and open a disconnector or
the like to isolate all sources of power/voltage from both the primary and auxiliary circuits.
Otherwise, electric shock may result.
(3) When terminating conductors to the ACB, tighten terminal screws to the torque specified in
the following table.
Otherwise, a fire could result.
Terminal Screws and Tightening Torque Units in N·m
ACB type
Main circuit
Auxiliary circuit
Terminal screw
Tightening torque
Terminal screw
Tightening torque
AME3B, AME4B
AME6B, AME8B, AME10B
Hex. socket head
screw M12
40.2 - 65.7
Pan head screw
M3.5
0.88 - 1.18
(4) Be sure to bring the connecting conductors into close contact with the stud bars.
Otherwise, a fire could result.
(5) Avoid blockage of the arc gas vents to ensure adequate arc space (insulation distance).
Blocking the arc gas vents could prevent the ACB from tripping.
(6) Do not place the ACB in such an area that is subject to high temperature, high humidity,
dusty air, corrosive gas, strong vibration and shock, or other unusual conditions.
Mounting in such areas could cause a fire, non-tripping, or malfunction.
(7) Be careful to prevent foreign objects (debris, concrete powder, iron powder, etc.) and
rainwater from entering the ACB.
These materials inside the products could cause a fire or non-tripping.
(8) Use both hands to support the ACB
when mounting or dismounting it.
A heavy ACB, in particular, should
be held by two persons.
Dropping or toppling the ACB may
cause damage to it or personal injury.
ACB Mass (kg)
ACB type
Manual operated
Motor operated
AME3B, AME4B
6.5
11.2
AME6B
10
15.6
AME8B, AME10B
19.5
25.9
Fig. 1 Installation Example (AME4B with horizontal stud bar)
ACB Mounting Screws and Tightening Torque
ACB type
Screw diameter
Tightening torque N·m
AME3B, AME4B
M8
11.8 - 18.6
AME6B,
M10
22.5 - 37.2
AME8B, AME10B
M8
11.8 - 18.6
ACB
Mounting screw
Mounting plate
Stud
Terminal screw
Connecting
conductor
Mounting angle
(not supplied)
Stud

KRB-5200h
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Other Precautions
1) Install the ACB main unit vertically.
For AME3B, AME4B and AME6B, the stud bar direction can be changed from horizontal to
vertical in the field.
When changing the stud bar direction, observe the following safety notice. This work must be
done by competent persons.
Caution
(1) Remove the stud fixing screw and then rotate the stud 90° to the vertical position.
Fig. 2
Stud Assembly
(2) Clean the stud mounting face which comes into contact with the ACB terminal.
Dust or foreign materials on the mounting face may cause a fire.
(3) Insert the stud until it comes into contact with the ACB terminal.
Insufficient contact may cause a fire.
(4) Tighten the stud fixing screw to a torque of 19 - 29 N·m.
Insufficient torque may cause a fire. Excessive torque may damage the screw.
(5) Attach the accessory insulating tube to the center pole (S phase) in order to ensure the
insulation distance between phases.
2) Ensure that a mounting angle has sufficient strength to support the ACB mass.
Vibration, in particular, must be taken into consideration.
Be sure to avoid resonance.
Otherwise, vibration of the switchboard could result in false tripping of the ACB.
3) Do not place the ACB in such an area that is subject to direct sunlight.
4) Clean the connecting surface.
It is recommended that the connecting surface of the connecting conductors be subject to
silver-plating or the like in order to reduce the contact resistance on the surface.
5) When applying the frame current continuously, use the connecting conductors whose size is
equal to or larger than shown below.
Otherwise, overheat may result.
ACB Type
AME3B
AME4B
AME6B
AME8B
AME10B
Frame current *
250A
400A
630A
800A
1000A
Conductor size
150 mm2
2 x 100 mm2
2 x 50 x 5
2 x 50 x 5
2 x 60 x 5
*) At ambient temperature of 45 ℃
6) Ensure adequate insulation distance (specified per your switchboard) from bare live parts of
terminals and connecting conductors to a mounting angle and bare live parts of other
components.
7) attach the accessory insulating tube to the center pole (S-phase) to ensure insulation against
other poles.
8) Secure the connecting conductors firmly using supporting means so that an electromagnetic
force caused by a large current flowing through the ACB or other harmful force does not directly
act upon the ACB stud.
Stud fixing screw
(hex. socket head screw M10)
ACB
ACB terminal
Mounting face
Insulation base
Stud (Rotate 90°)

KRB-5200h
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3.2 Installing Plug-in ACB
For details of ACB mounting dimensions, see the catalogue.
Warning
(1) Be sure to open or trip the live ACB before mounting or dismounting it.
Otherwise, a fire or personal injury may result.
(2) Never touch live parts or terminals when mounting or dismounting the live ACB.
Otherwise, electric shock may result.
Caution
(1) Installation work must be performed by competent persons.
(2) Prior to commencing any work on the ACB, stop the generator and open a disconnector or
the like to isolate all sources of power/voltage from both the primary and auxiliary circuits.
Otherwise, electric shock may result.
(3) Tighten the terminal screws to the torque specified in the following table.
Otherwise, a fire could result.
Terminal Screws of Plug-in Mounting Base and Tightening Torque Units in N·m
ACB Type
Main circuit
Auxiliary circuit
Terminal screw
Tightening torque
Terminal screw
Tightening torque
AME3B, AME4B
Hex. nut
M10
18.6 - 29.4
Pan head
M3.5
0.88 - 1.18
AME6B
Hex. nut
M16
51.5 - 84.3
AME8B, AME10B
Hex. nut
M12
40.2 - 65.7
(4) Be sure to bring the connecting conductors into close contact with the plug-in mounting
base terminal.
Otherwise, a fire could result.
(5) Avoid blocking the arc gas vents of the ACB to ensure adequate arc space (insulation
distance).
Blocking the vents could result in failure of ACB tripping.
(6) Do not place The ACB in such an area that is subject to high temperature, high humidity,
dusty air, corrosive gas, strong vibration and shock, or other unusual conditions.
Mounting in such areas could cause a fire, non-tripping, or malfunction.
(7) Be careful to prevent foreign objects (debris, concrete powder, iron powder, etc.) and
rainwater from entering the ACB.
These materials inside the ACB could cause a fire or non-tripping.
(8) Use both hands to support the ACB
when mounting or dismounting it.
A heavy ACB should be carried by
two persons.
Dropping or toppling the ACB may
cause damage to it or personal injury.
ACB Mass (kg)
ACB type
Manual operated
Motor operated
AME3B, AME4B
5
9.7
AME6B
9.6
15.2
AME8B, AME10B
16
22.4

KRB-5200h
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Fig. 3
Mounting and Connection Example (AME4B)
Other Precautions
1) Install the plug-in mounting base vertically with the label mark upward.
Combination of ACB and Mounting Base
ACB type
Mounting base
Mounting bolt diameter
AME3B, AME4B
XDM4
M8
AME6B
XDM6
M10
AME8B, AME10B
XDM8
M10
2) For the procedure for mounting the auxiliary circuit terminal block see the accompanying
document.
Mount the terminal block on the mounting base according to the following arrangement.
Terminal Arrangement Viewed from Rear Side
ACB
type
With UVT
With SHT
Arrangement 1
Arrangement 2
(with alarm switch)
Arrangement 3
Arrangement 4
(with alarm switch)
AME3B
AME4B
ON side
ON side
ON side
ON side
AXc1
AXa1
AXb1
AXc2
AXa2
AXb2
T1
T2
U1
U2
AXc1
AXa1
AXb1
ALc1
ALa1
ALb1
T1
T2
U1
U2
AXc1
AXa1
AXb1
AXc2
AXa2
AXb2
S1
S2
AXc1
AXa1
AXb1
ALc1
ALa1
ALb1
S1
S2
OFF side
OFF side
OFF side
OFF side
AME6B
AME8B
AME10B
ON side
ON side
ON side
ON side
AXc1
AXa1
AXb1
AXc3
AXa3
AXb3
T1
T2
U1
U2
AXc1
AXa1
AXb1
ALc1
ALa1
ALb1
T1
T2
U1
U2
AXc1
AXa1
AXb1
AXc3
AXa3
AXb3
S1
S2
AXc1
AXa1
AXb1
ALc1
ALa1
ALb1
S1
S2
AXc2
AXa2
AXb2
AXc4
AXa4
AXc2
AXa2
AXb2
AXc2
AXa2
AXb2
AXc4
AXa4
AXc2
AXa2
AXb2
OFF side
OFF side
OFF side
OFF side
ON
SIDE
Control wire
ACB
ACB mounting screw
Plug-in mounting base
(for XMD4)
Mounting angle (not supplied)
Mounting base
fixing screw
Connecting conductor
Auxiliary circuit
terminal block
M3.5 screw
Terminal screw
Terminal screw

KRB-5200h
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3) Check to be sure that a mounting angle has sufficient strength to support the ACB mass.
Vibration, in particular, must be taken into account. Vibration of the switchboard could result in
false tripping of the ACB.
Be sure to avoid resonance.
4) Do not place the ACB in such an area that is subject to direct sunlight.
5) Clean the connecting surface.
It is recommended that the connecting surface of the connecting conductors be subject to
silver-plating or the like in order to reduce the contact resistance on the surface.
6) When applying the frame current continuously, use the connecting conductors whose size is
equal to or larger than shown below.
Otherwise, overheat could result.
ACB type
AME3B
AME4B
AME6B
AME8B
AME10B
Frame current *
250 A
400 A
630 A
800 A
1000 A
Conductor size
150 mm2
2 x 100 mm2
2 x 50 x 5
2x 50 x 5
2x 60 x 5
*) At ambient temperature of 45 ℃
7) Ensure adequate insulation distance (specified per your switchboard) from bare live parts of
terminals and connecting conductors to a mounting angle and bare live parts of other
components.
8) Secure the connecting conductors firmly using supporting means so that an electromagnetic
force caused by a large current flowing through the ACB or other harmful force does not directly
act upon the ACB plug-in mounting base terminals.
9) How to mount the ACB:
①Open or trip the ACB before mounting it.
(This applies to dismounting.)
②Install the ACB so that the ACB mounting bolts are inserted into the four mounting holes (with
cap nuts). (See Fig. 3.)
③Tighten the four cap nuts gradually in diagonal order
Do not tighten a particular nut intensively.
Cap Nut Tightening Torque and Tool
ACB type
Tightening torque N·m
Tool
AME3B, AME4B
3.6 - 6.0
Flat-head screw driver
AME6B, AME8B, AME10B
8.8 - 14.7
Allen wrench (nominal size 8)

KRB-5200h
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3.3 Connection and Specifications of Accessories
3.3.1 Undervoltage Trip Device (UVT)
The UVT is optional.
Check if the rated voltage shown on the accessory
nameplate (attached on the ACB left side) is
suitable for the working voltage.
The UVT trips the ACB when the supply voltage
(between U1and U2) lowers to the opening voltage
with a delay of 50 ms to 120 ms, and closes the ACB
when the supply voltage returns to the resettable voltage.
The UVT also allows ACB remote instantaneous tripping by closing the path between T1and T2.
The UVT operating mechanism permits the ACB to trip open at the open-circuit voltage or less,
only when the ACB operating handle is in the ON position. Accordingly, reset operation is
allowed even if the UVT coil is not excited.
The UVT coil also serves as an overcurrent trip coil.
1) Connection
Connect the trip signal wire and power supply wire to the auxiliary circuit terminals as shown in
Fig. 4.
For the rear-connected ACB, connect the wires to the specified terminals on the left side of the
ACB.
For the plug-in ACB, connect the wires to the specified terminals on the rear side of the mounting
base.
Fig. 4
UVT Connection Diagram
Caution : The voltage between terminals T1 and T2 is 20 VDC and the operating current is 10
mA.
Caution : For rear-connected ACB, be sure to replace the terminal cover (transparent) after
connecting the wires.
2) Ratings
Operating Voltage and Exciting Current
Rated voltage
(at 50/60 Hz)
Opening voltage
Resettable voltage
Exciting current U1 - U2
(at 60 Hz)
100 - 115 VAC
41 -70 V
85V or less
21 mA
200 - 230 VAC
81 - 140 V
170V or less
11 mA
380 - 450 VAC
158 - 266 V
323V or less
6 mA
UVT CONTROL DEVICE
AC 450 V,50 / 60Hz
Electrical
Trip Terminal Source
1A0321SAA
450
T 1
T 2
U 1
U 2
CONTROL DEVICE
U1
U2
T1
T2
OCR controller
Y
Z
TN
UVT
Trip signal
Power
supply
Interlock switch
Note: The voltage between
terminals Y and Z is 24 VDC

KRB-5200h
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3.3.2 Shunt Trip Device (SHT)
The SHT is optional.
Check if the rated voltage shown on the accessory nameplate (attached on the ACB left side) is
suitable for the working voltage.
The SHT is used to trip the ACB electrically from a remote position.
The SHT is equipped with the anti-burnout switch (see Fig. 5), and trips the ACB after it is
closed. Consequently, note that the SHT does not provide electrical interlock.
1) Connection
Connect the power supply wire to the auxiliary circuit terminal as shown in Fig. 5.
For the rear-connected ACB, connect the power supply wire to the specified terminal on the left
side of the ACB.
For the plug-in ACB, connect the power supply wire to the specified terminal on the rear side of
the mounting base.
Fig. 5
SHT Connection Diagram
Caution : The SHT is rated for short time. Although it contains a switch which connects to the
SHT coil in serial and makes the coil unexcited, continuous signals should not be given to the
SHT.
Caution : Be sure to replace the terminal cover (transparent) after connecting the wires.
2) Ratings
Opening Voltage and Exciting Current
Rated voltage
(at 50/60 Hz)
Operating voltage range
Exciting current *
(peak value)
100 - 115 VAC
70 - 127 V
1.1 A
200 - 480 VAC
140 - 528 V
0.93 A
*) At max. rated voltage (60 Hz)
SHUNT TRIP
V 50/60Hz
V DC
S2S1
200-480
S2
S1
Anti-burnout switch
SHT
Trip signal
Power
supply
Note: The anti-burnout switch
operates in the same way as
the auxiliary switch.

KRB-5200h
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3.3.3 Auxiliary Switch (AX) and Alarm Switch (AL)
The auxiliary switch is used to indicate the ON or OFF state of the ACB.
The alarm switch (optional) is used to indicate the TRIPPED state of the ACB.
Switch Operation
Contact arrangement
State of ACB
ON
OFF
TRIPPED
AX AXb AXa
AXc
AXc - AXa
Close
Open
AXc - AXb
Open
Close
AL ALb1 ALa1
ALc1
ALc1 - ALa1
Open
Close
ALc1 - ALb1
Close
Open
1) Connection
Connect the control wire to the auxiliary terminal.
For the rear-connected ACB, connect the control wire to the specified terminal on the right side of
the ACB.
For the plug-in ACB, connect the power supply wire to the specified terminal on the rear side of
the mounting base.
2) Contact ratings
Caution : The contact load must fall within the range from the minim load to the rated load.
Caution : The ratings shown on the accessory nameplate are for the resistive/inductive load.
For lamp or motor load, see the following table.
(The lamp load involves an inrush current of 10 times the rated load. The inductive load has a
power factor of 0.4 (AC) and a time constant of 7 ms (DC). The motor load involves an inrush
current of 6 times the rated load.)
Applied current
(at 50/60 Hz)
Current (A)
Minimum
load
Resistive load
Lamp load
Inductive load
Motor load
480 VAC
1
0.2
1
0.3
250 VAC
5
1.5
5
2
30 VDC
125 VAC
5
2
5
3
26.7 mA,
250 VDC
0.3
0.05
0.3
0.05
5 VDC
125 VDC
0.6
0.1
0.6
0.1
150 mA
30 VDC
5
3
4
3

KRB-5200h
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3.3.4 Motor Operator
The motor operator (optional) permits the ACB to be electrically closed, opened (reset) from a
remote position.
1) Connection
Remove the terminal cover (transparent) and connect the operating switch control wire and the
power supply wire to the control circuit terminals as follows:
Fig. 6
Motor Operator Connection Diagram
Caution : Be sure to replace the terminal cover (transparent) after connecting the wires.
Caution : Motor operator XMD4M is hinged type. Sag the wire so that the motor operator can
be uplifted as shown in Fig. 7. For removing the motor operator, see the XMD Series Motor
Operator - Operating Instructions.
Fig. 7
XMD4M (hinged type)
2) Ratings
The following table shows the operating current at the maximum rated voltage.
The accessory nameplate indicates the steady-state current. For the operating switch ratings
and power capacity refer to the starting current.
Operating Current
Rated current
(at 50/60 Hz)
Operation
Steady-state current (A)/Starting current (A, peak)
XMD4M
XMD6M
XMD9M
100 - 115 VAC
Close (ON)
-/3.1
-/3.1
-/3.1
Open(OFF)/Reset
1.2/5.7
1.8/6.0
1.8/6.0
200 - 230 VAC
Close (ON)
-/1.2
-/1.2
-/1.2
Open(OFF)/Reset
0.7/3.0
1.0/3.2
1.0/3.2
Motor operator
ON switch
OFF/RESET
switch
Power
Supply
On
Off
MP1
MP2
E
XMD4M
Control circuit terminal
Hinge
ACB

KRB-5200h
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4. OPERATION
4.1 Direct-Manual Operation
Warning
Never touch live terminal parts
Otherwise, electric shock may result.
ON OFF TRIPPED (RESET)
Main contacts Main contacts Main contacts Main contacts
“Closed” “Open” “Open” “Open”
Fig. 8
Handle Positions and Status Indication
1) ON operation
Caution
If the ACB trips open automatically, remove the cause before closing the ACB.
Otherwise, a fire could result.
To close the ACB, set the operating handle to the ON position.
Caution : When the ACB is equipped with the undervoltage trip device (UVT), the UVT coil must
be excited to permit the ON operation.
2) OFF operation
To open the breaker, set the operating handle to the OFF position.
Caution : If the main contacts are damaged (welded), the ACB cannot open. In this case, the
operating handle will return to the ON position when the handle is released at the OFF position.
Replace the ACB.
3) Tripping operation
When the overcurrent trip device (OCR), UVT, or shunt trip device (SHT) is activated, the ACB
trips open and the operating handle moves to the TRIPPED position automatically.
To check the tripping mechanism or the alarm switch, use the trip button. Pressing the trip
button will trip the ACB. The trip button operating force is as follows:
ACB type
Trip button operating force N
AME3B, AME4B
19.6
AME6B, AME8B, AME10B
4.9
RESET position
TRIPPED position
OFF position
ON position

KRB-5200h
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4) Reset operation
To close the tripped ACB, the reset operation is necessary. To reset the ACB, move the
operating handle to the RESET position beyond the OFF position.
When the UVT coil is not excited, the ACB can be reset but not closed.
5) Extension handle
The use of the extension handle reduces the operating force as shown in the following table.
Operating Force
ACB type
Operation
Handle operating force N
Extension
handle
OFF ⇒ON
ON ⇒OFF
Tripped ⇒Reset
AME3B,
AME4B
Direct
86.2
68.6
92.1
Not supplied
AME6B
Direct
121
95.1
235
Supplied
Extension handle used
76.4
59.8
149
AME8B,
Direct
157
118
343
Supplied
AME10B
Extension handle used
97
72.5
212
Pulling both the lock pins in the arrow directions
will permit the extension handle to be installed.
(The extension handle will be spring-locked.)
To remove the extension handle, pull the lock
pins in the same way. The extension handle
will be unlocked and able to be removed.
ACB operating
handle
Lock pin
Extension handle