Mitsubishi Electric MS-T Series User manual

MS-TSeries
A
13
IB(NA)0200004ENG-A（1309）MEE
Magnetic Contactors and Magnetic Starters
INSTRUCTION MANUAL
Magnetic Contactors and Magnetic Starters
NSTRUCTION MANUAL
To ensure proper use of the products listed in this catalog,
please be sure to read the instruction manual prior to use.
Safety Warning
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www.MitsubishiElectric.co.jp/melfansweb
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Group,s environmental statement, and
expresses the Group,s stance on
environmental management. Through a
wide range of businesses, we are helping
contribute to the realization of a
sustainable society.

1
Safety Precautions
Please read this Instruction Manual and enclosed documents before starting mounting, operation,
maintenance and inspections to ensure correct usage. Thoroughly understand the equipment and device,
safety information and precautions before starting operation. The safety precautions are ranked as
"WARNING" and "CAUTION" in this Instruction Manual.
If handling is mistaken, a dangerous situation may occur, leading to fatal or major
injuries.
If handling is mistaken, a dangerous situation may occur, leading to medium or
minor injuries, or only material damage.
Note that some items described as ! CAUTION may lead to serious results depending on the situation.
Both instruction levels must be observed because they are very important for safety.
The contents of this Instruction Manual are subject to change without notice.
Mitsubishi Electric will not be held responsible for any damage caused by repairs, disassembly or
modifications by a party other than Mitsubishi or a Mitsubishi Electric Service Center.
For the use in high-reliability-requiring applications such as nuclear energy control, moving objects
including vehicles, traffic light control, medical purposes, etc., please contact Mitsubishi.
Despite our continuous efforts to improve the quality and reliability of our product, the product could fail.
Vibration, shocks, improper wiring to the magnetic contactor may also cause a failure and may also lead to
a serious consequence such as a machine malfunction and power supply short-circuit. Take measures to
prevent secondary damage such as personal injuries or fires resulting from this product’s failure and
malfunction.
Store the "Instruction manual" and "Precautions for Use" enclosed with the product in a place that is easily
accessible.
Always disconnect the product from the power source before starting installation, maintenance or
inspections. There is a risk of electric shock.
Failure to observe this could result in serious results (machine malfunction, power supply short-circuit, etc.)
caused by vibration or impact of the product or by improper wiring, etc.
Do not touch or go near the product (especially live sections such as terminals) while the power is ON.
Failure to observe this could lead to electric shocks or burns.
Do not modify or disassemble the MS-T series. The parts such as the contacts or coils cannot be replaced.
Failure to observe this could result in faults.
Secure a space larger than that specified in the Instruction Manual when mounting the product.
Failure to observe this could lead to burns or fires.
Use wires that meet the applied voltage, continuity current, and inrush current, and tighten them with the
tightening torque specified in the Instruction Manual.
Always confirm the ratings and specifications, and use the product within the specified ratings and
specifications.
Use in an environment that exceeds the ratings or specifications could lead to ground faults or short circuit
accidents due to destruction of insulation, fires due to overheating, and damage due to inhibited shut off.
CAUTION
WARNING
CAUTION
WARNING

2
The areas around the terminals and coils will become hot while the power is ON. Do not touch these
without proper care.
Never manually operate the product in the live state.
If contacts are by switched excessive currents, or if contacts are welded and do not open due to abnormal
wear, deterioration of the contacts, or the end of product life, the machine device could become
uncontrollable. Ensure safety by predicting such mechanical constraints and inhibited closing and releasing
caused by contact welding.
If chattering occurs in the operation command contacts, the contacts may become welded and lead to
malfunction or fires.
If smoke is generated due to a short circuit accident, etc., toxic gas may be generated. Make sure not to
inhale the toxic gas.
If the contacts are welded because of wear, there is a risk of fire. Always use this product together with a
suitable protection device such as a wiring breaker or fuse.
The coil’s voltage fluctuation range is 85 to 110%, however if a voltage exceeding 100% is applied for a
long time, deterioration of the coil insulation will increase, and the mechanical durability will drop. Always
use the coil within an average rated voltage of 95 to 100%.
If a voltage too low in operating a magnetic contactor is applied, a current exceeding the rating may flow to
the coil and could soon burn the coil or start a fire.
If the wiring for the operation circuit is long, the wiring impedance could lower the coil voltage and inhibit
contacts from closing when an instantaneous current flows through the coil.
Depending on the stray capacitance in the wiring, the contacts may not open even when the coil is
de-excited.
Use in a circuit that contains harmonics or surges could result in coil burning or fires.
CAUTION

3
Contents
1. Working Environment....................................................................................................................... 4
2. Storage and Transportation ............................................................................................................. 6
3. Mounting and Connection ................................................................................................................ 7
3.1 Mounting................................................................................................................................ 7
3.2 Connection ............................................................................................................................ 8
3.3 Installation Instruction for Accessories of MS-T Series ....................................................... 12
3.3.1 Additional auxiliary contact blocks........................................................................... 12
3.3.2 Mechanical interlock kits.......................................................................................... 13
3.3.3 Surge absorber........................................................................................................ 15
3.4 Wiring Diagram.................................................................................................................... 16
3.4.1 S-T□....................................................................................................................... 16
3.4.2 S-2×T□.................................................................................................................. 17
3.4.3 TH-T□(KP).............................................................................................................. 18
3.4.4 MSO-T□(KP) .......................................................................................................... 18
3.4.5 MSO-2×T□(KP)..................................................................................................... 19
4. Maintenance and Inspection of Thermal Overload Relay .............................................................. 20
5. Recommended Update Interval ..................................................................................................... 25
6. Maintenance and Inspection Check List ........................................................................................ 25
7. Troubleshooting List....................................................................................................................... 26

4
1. Working Environment
Using this product in an environment or atmosphere other than the normal working
conditions could lead to failure. Always use the product under the normal working
conditions.
The working environment varies as the controller is used in a wide range of applications. However, the
product has been manufactured to be used under the following normal working conditions. Measures such
as those given in section (2) are required when using the product in an environment differing from the
following conditions.
A special-environment model, which takes special environmental measures, is also available upon request.
(1) Normal working conditions
Ambient temperature: –10C to 40C (applies to outside of control panel)
Max. daily average temperature 35C, max. annual average temperature
25C
Maximum temperature: 55C, however, ambient temperature for boxed MS type is 40°C (annual
in the panel average temperature in the panel is 40°C or less)
Note that the magnetic contactor, magnetic motor starter and thermal
overload relay operation characteristics are affected by the ambient
temperature.
Relative humidity: 45 to 85%RH
Note that there must be no dew condensation or freezing.
Altitude: 2,000m or less
Vibration: 10 to 55Hz 19.6m/s2(Max.)
Impact: 49m/s2(Max.)
Atmosphere: Low levels of dust, smoke, corrosive gas, water or sodium.
When used in a sealed state for a long time, contact failure, etc., can occur.
Do not use the products in an atmosphere containing flammable gas.
Storage temperature/ : –30C to 65C / 45% to 85% RH
storage humidity Note that there must be no dew condensation or freezing.
Storage temperature refers to ambient temperature during transportation or
storage of product. When starting use of the product, the temperature must
be within the working temperature.
(2) Special environment measures
The main measures for when using the products under conditions that differ from the normal working
conditions are shown on the following page for reference.
There is a limit to how far the environment resistance of the product can be improved. Thus, an
appropriate structure for the outer box (panel) storing the product that is outdoor-proof, dust-proof, and
corrosion-proof must be used, to prevent damage.
CAUTION

5
For special environment
Special environment Problem points General measures Name Type
Sudden temperature
changes
Rusting or
malfunctioning due
to dew
condensation
(freezing)
Install a space
heater to lower the
relative humidity.
Move the product
to a place with little
temperature
change.
Low temperature
Freezer storage
Low temperature
room
Freezing
Malfunctioning or
rust due to dew
condensation.
Install a space
heater, etc., to
increase the
temperature.
Dry the area.
Consult
Mitsubishi when
the temperature
is –10C or less.
High temperature
Steel mill
Molding forming
plant
Malfunctioning
Heat resistance of
connected wires
Overheating of
insulator
Lower load
current.
Use heat resistant
wires.
Do not use in
places where the
temperature in the
panel exceeds
55C.
High humidity
Chemical plants
Pump room
Drop in insulation
resistance
Corrosion, rusting
Place in a
waterproof type
box, etc.
Inspect regulary.
Corrosion-
proof
treatment
MSO- YS
(supported by the
S-T type
magnetic
contactor as
standard.)
Corrosive gas, sodium
Petrol refining plant
Chemical plant
Coastline
City water pump
room (Chlorine
disinfectant)
Corrosion, rusting Place
anti-corrosive
product in
corrosion-proof
type box, etc. Corrosion-
proof
treatment
MSO- YS
(supported by the
S-T type
magnetic
contactor as
standard.)
Use it in
corrosion-proof
box.
Dust, moisture
Cement plant
Textile plant
Failure in contact
continuity
Failure in
mechanism
operation
Deterioration of
insulation
Place in a dust-
proof box, etc.

6
2. Storage and Transportation
Take caution to injuries from the edges of the packaging material or the product, or
from dropping the product.
Confirm that no parts have fallen off or been damaged due to accidents during
transportation.
After unpacking the product, do not leave it in a humid or dusty place.
Do not stand/sit on or place objects on the product.
(1) Storage and transportation
The ambient temperature/humidity when storing or transporting the product must be between –30C
and 65C / between 45% and 85%RH. The normal working conditions must be established before use.
Packing and storing
Do not place the product directly on a concrete floor, etc. Always place it on slats or a shelf.
Do not store the product exposed without packaging.
Avoid humidity
Do not leave the product for long periods in a place with a high humidity level.
Avoid corrosive gases
Do not leave the product in an atmosphere containing sulfuric gas, ammonium gas or chloric gas.
(2) Precautions for transportation
Carefully pack and transport.
Do not drop the product during transportation.
When transporting the product after mounting and wiring it to a panel, pack it carefully. The movable
parts do not need to be locked during transportation.
Do not hold by terminals or wires when transporting.
Holding by terminals, thermal overload relays or wires, etc., when transporting the product could lead
to damage or dropping.
(3) Long-term storage after mounting and before usage
After completing the product as a panel, the power might not be turned on over a long period. If the
product is delivered during construction, cement, concrete and water, etc., can enter the product.
In this case, always protect the product until it is to be used.
CAUTION

7
3. Mounting and Connection
Do not touch or go near the product while the power is ON. Failure to observe this
could lead to electric shocks or burns.
Make sure that foreign matter does not enter the product during mounting or wiring.
There is a risk of load damage or fires resulting from contact faults or operation faults.
Do not use a product that is damaged during transportation, mounting or wiring.
Failure to observe this could lead to fires or malfunctions.
If the mounting screw size is changed or an insufficient number is used, or if the
mounting onto the mounting rail (IEC35mm width) is incomplete, the product may fall off.
If the control circuit wiring is long, turning OFF the control voltage may not open the
circuit because of a stray capacitance.
Never manually operate the product in a live state. Failure to observe this could lead
to electric shocks or burns.
If the product is stored in a box, always close the cover while the power is ON.
Failure to observe this could lead to electric shocks.
Do not mount the product on the floor or ceiling. Mounting on the floor or ceiling will
affect the contact’s conductive performance, operation performance, durability, etc.
3.1 Mounting
Mount the product in a dry place that has little dust, corrosive gas or vibration.
The correct mounting position is a vertical surface. However, the product can be mounted vertically up to
30in each direction.
Tighten the mounting screw with the mounting torque shown in the Table below.
Correct
mounting
Tolerable limits to vertical surface
Screw
size
Mounting screw tightening
torque
Nm
M4 1.2 to 1.9
Horizontal mounting
(Excluding reversing type)
If horizontal mounting is unavoidable, turn the product 90in
the counterclockwise direction from the correct vertical
mounting state, and mount.
The characteristics will not change much from when the
product is mounted horizontally but mechanical endurance may
drop somewhat.
This mounting method is not available with the reversing type.
Also, the product cannot be mounted horizontally onto a
mounting rail (IEC35mm width).
Mounting on IEC35mm rail
The T10 to T32 series and SR-T series can be mounted
on an IEC35mm wide rail. The rail height is 7.5 or 15mm.
The rail dimensions are shown on the right.
When mounting the rail onto a panel, keep the rail
mounting screw pitch within the values shown on the
right to maintain the mechanical strength.
Always maintain the dimensions shown on page 8 as
these influence temperature rises and product life.
IEC35mm wide rail dimension
Height 7.5mm wide rail: P = 250 or less
Height 15mm wide rail: P = 500 or less
For each, the dimensions show the case when the device is mounted on a
7.5mm high mounting rail with the clearances shown in Table 1 on page 8.
Interval between mount screws for IEC35mm wide rail
CAUTION
WARNING
Height 7.5mm
"Z" details
Height 15mm
"Z" details
No burrs
0.3 or less
Rail mount screw
Top
Bottom

8
Minimum mounting clearance
Always observe the specified minimum mounting clearance and arc space. Hot
ionized gas will be discharged when the current switches.
Refer to Table 1.
When mounting the Magnetic Contactors side by side, be sure to keep the devices isolated by a distance
longer than the dimension shown in the following table. Also, the Magnetic Contactors and adjacent
grounding metal should be isolated by a distance longer than the dimension shown in the following table.
The content described in ( ) is applied when additionally mounting auxiliary contacts.
Although an arc space is not required in a position above the Magnetic Contactors, it is recommended to
provide a space longer than the E dimension shown in the following table in consideration of the product
movement caused by variation in depth dimension of Magnetic Contactors and the vibration produced
when turning on or releasing the contactor.
Table 1 Minimum mounting separation
Minimum mounting space
Frame A(A1, A2)
dimension
[mm]
B(B1, B2)
dimension
[mm]
C (C1)
dimension
[mm]
D
dimension
[mm]
Arc
Space
(Note 1)
Upper
mounting
space
E
T10 41
(A1= 53, A2= 65)
T12
T20
48
(A1= 60, A2= 72)
T21
T25
68
(A1= 80, A2= 92)
T32 48
(A1= 60, A2= 72)
SR-T5 48
(A1= 60, A2= 72)
5 (Note 2)
(B1= 17,
B2= 29)
10
(C1= 22)
5
(Note 3)
A1, B1, C1: When an auxiliary contact is added to
the shadowed area
A2, B2: When two auxiliary contacts are added
to the shadowed area
Mounting space and arc space SR-T9 48 5 (Note 2) 10
15 0
3
Note 1. The value of this arc space is a value of IEC and JIS Standards-based closed circuit shut-off
capacity test.
Note 2. Although the B dimension of T10 to T32 allows closely-attached mounting, when continuing to
apply current to the device or when mounting a product high in open/close frequency and high
utilization on the same rail, the device life may be shortened in terms of temperature increase
and impact, so please keep the space between the devices over the minimum value shown in the
above table as much as possible when mounting them.
Note 3. E dimension is 3mm when mounting UT-AX2 or UT-AX4 with magnetic contactors.
3.2 Connection
If the terminal screws become loose, overheating or fires may occur. Always tighten
with the specified tightening torque and tighten the screws periodically.
An excessive tightening torque could damage the terminal screw.

A
sufficient insulation distance must be secured for the crimp terminal and connection
conductor connected to the terminal, if not, short circuits could occur.
If the wire size is insufficient, overheating or fires could occur. Use wire appropriate
for the working conditions.
If lock paint or a thermo-label, etc., adheres to the wire connection section or contact,
overheating or fires could occur due to continuity failures.
If the terminal screws have been loosened, securely tighten them with the specified
tightening torque. Failure to observe this could lead to overheating or fires.
(1) Coil voltage and frequency
The voltage and frequency of the control circuit must match with the rated indicated voltage and
frequency of the coil.
(2) Connection to terminal screw with self-lifting plate
The provided terminal screw with self-lifting plate can be used even when a crimp terminal is used. For
the terminal screw with self-lifting plate, wires can be connected with their insulation sheath peeled off.
CAUTION
CAUTION
( On e w ire) (Tw o wir es)

9
(3) Connection to streamlined wiring terminal (For S-TBC, SR-TBC, TH-TBC)
Bare wire, single wire, Y-type crimp terminal
1) Insert the wire and Y-type crimp terminal into the terminal. (Fig. 1)
When doing so, make sure the insulator such as wire’s sleeve does not get
caught in the te rminal
2) Tighten the terminal screw with the specified tightening torque.
3) To remove the wire, loosen the terminal screw, and then pull out the wire
while holding down the terminal screw holder so it does not lift up.
Round crimp terminal
1) Confirm that the terminal screw has been loosened.
2) Lift the screw holder for each pole. (Fig. 2) (Note 2)
(a) Wiring procedure for one crimp terminal
3) Insert the crimp terminal. (Fig. 2)
4) Lower the screw holder. (Insert the end of the screw, and temporarily fix.)
5) Tighten the screw. (Note 3)
6) To remove the wire, follow the tightening procedure in reverse.
(b) Wiring procedure for two crimp terminals
3) Insert two crimp terminals. (Fig. 3)
4) Lower the terminal screw holder. (Temporarily fix the crimp terminals.)(Fig. 4)
5) Tighten the screw. (Note 3)
6) To remove the wire, completely loosen the screw, lift the screw holder,
lower the crimp terminal toward the terminal, and remove the wire.
Note 1. The terminal screw differs from the MS-N series, so make sure that differing types of screws are not used.
Note 2. If the screw holder cannot be lifted, completely loosen the terminal screw and then lift it up.
Note 3. When tightening the screw, slightly press down on the screwdriver while rotating it, so that the screw fits in securely.
Note 4. Also, tighten the terminal screws to which wires have not been connected.
(4) Precautions for connecting crimp terminal
(4-1) Application to circuits exceeding 380V
When using the following types of magnetic motor starters or magnetic relays in circuits where
the voltage exceeds 380V with crimp terminal wiring, use of a crimp terminal with insulation tube
is recommended.

Crimp terminal with insulation tube
Bare crimp terminal
MSO-T10,T12,T20 magnetic motor
starter
S-T10,T12,T20 magnetic contactor
SR-T5,T9 contactor relays
TH-T18 thermal overload relay
(4-2) Application to finger protection
When using the product as a finger protection type with crimp terminals, use the crimp terminal
with insulation tube.
Terminal screw holder
2)
3) 3)
4)
Fig. 2 Fig. 3 Fig. 4
1)
2)
Fig. 1

10
(5) For the applicable wire size and terminal screw tightening torque, refer to Table 2.
(6) Always ground the metal enclosure.
Table 2 Wire size and tightening torque
Model Terminal dimension and size/type of screw
Main circuit Operating
circuit
Applicable electric wire
size [φmm, mm2]
Connection
conductor
thickness
(D) [mm]
Applicable solderless
terminal size
(JST Cat No.)
Tightening torque of
terminal screw
[N·m]
Standard type
Contactor Relays
Magnetic Contactors
Thermal Overload
Relays
Dimension of
terminal
portion
A x B x C
[mm] (Note 1)
Screw
size
Screw
type
cross slot
screw with
pressure
plate
Main
circuit
Operating
circuit
Main
circuit
(Note 1)
Main circuit Operating
circuit
Main
circuit
Operating
circuit
SR-T5, T9 – – – M3.5×7.6 – – – –
S-T10, T12, T20 7.5×3.7×4.5 M3.5×7.6 M3.5×7.6 φ1.6
0.75 to 2.5 1.6 1.25-3.5 to 2-3.5 5.5-S3 0.9 to 1.5
S-T21, T25, T32 10.5×5.2×5.5 M4×10.5
cross slot
screw with
pressure
plate M3.5×7.6 φ1.6 - 2.6
1.25 to 6
φ1.6
0.75 to 2.5
3 1.25-4 to 5.5-4
1.25-3.5 to
2-3.5
1.2 to 1.9
0.9 to 1.5
TH-T18
(Load side) 7.5×4×4 M3.5×7.6 M3.5×7.6 φ1.6 0.75 to 2.5 2 1.25-3.5 to 2-3.5 5.5-S3 0.9 to 1.5
TH-T25
(Power side / Load side)
10.2×6.8×5/
10.2×5.7×5
M4×10.5/
M4×10.5
cross slot
screw with
pressure
plate M3.5×7.6 φ1.6 - 2.6
1.25 to 6
φ1.6
0.75 to 2.5 2.5 1.25-4 to 5.5-4
1.25-3.5 to
2-3.5 1.2 to 1.9
0.9 to 1.5
Note 1. The dimension of the main circuit terminal is a dimension for board
conductor wiring. (See the right diagram) The board conductor
thickness (D dimension) must be below the allowable connection
conductor thickness stated above because of the length of the
terminal screw. In case of wiring with two boards used, the total
value of two boards must be below the value (D dimension) shown in
the table.
Note 2. In each terminal, two wires or two solderless terminals are allowed to
be connected.
Note 3. The cross slot screw with pressure plate of T Series and N Series are same in size but different in
pressure plate dimension, so please avoid the mixed use of such screws. This may break the
insulation barrier or make the wire likely to fall out.
Note 4. When using IEC60529-based finger safe specification, be sure to use an insulation tube-attached
solderless terminal.
Note 5. Tightening the3 terminal screw excessively without wiring may break the screw and consequently
disable the tightening, so please avoid such excessive tightening.
Note 6. Operational circuits are coil terminals of magnetic contactors and control circuit terminals of
Thermal Overload Relays.
Note 7. Please use swaging tool which is recommended by JST.
Note 8. For the auxiliary a fixed contact elements of the S-T21 and T25 types, these elements could drop
off if its terminal screw is tightened with a screwdriver tilted towards the unit body. Do not tilt the
screwdriver towards the unit body when tightening the screw.
本体
ドライバ
補助a固定接触子
Note 9. Connection to magnetic contactor's load side auxiliary circuit terminal when using magnetic contactor
(MSO-(2) T10 to T20)
Bend the crimp terminal or wire as shown below and connect.
When connecting two crimp terminals or two wires, use a 0.75 to 1.25mm2wire for the "A" wire.
圧着端子の場合
A
サーマルリレー
110°
Thermal overload relay
For crimp terminal
Unit body
Screwdriver
Auxiliary a fixed contact element

11
Examples of general tightening torque
A typical male has an arm strength
of 200N, so if the tightening tool
handle’s length is 10cm, the torque
will be 20Nm.
(2000.1=20Nm)
Maximum tightening torque of screwdriver [Nm]
Phillips screwdriver
(made by VESSEL
)
Right
hand only
Left
hand only
Both
hands
No.1 bit
2.5 2.3 2.8
No.2 bit
3.6 3.0 3.9
No.3 bit
4.2 3.9 5.7
1. Hold the screwdriver horizontally, and rotate in the tightening
direction.
2. This is an example for a male having a right arm strength of 500N
and left arm strength of 450N.

12
3.3 Installation Instruction for Accessories of MS-T Series
3.3.1 Additional auxiliary contact blocks
(1) Types and applicable magnetic contactors and contactor relays
Types Contact
arrangement Method
Applicable magnetic
contactors and
contactor relays
Available nunmber of
accessories
4a (4NO)
3a1b (3NO1NC)
UT-AX4
2a2b (2NO2NC)
Front crip-on
S-T10,S-T12,
S-T20,S-T21,
S-T25,S-T32,SR-T5
1
(2) Additional auxiliary block mounting procedures
UT-AX4
Installation
Removing
Terminal cover Installation and Removing
1)
2)
Click
1)
2)
3)
Installation
Removing

13
3.3.2 Mechanical interlock kits
When two or more contactors are used, and a short circuit might occur if they turn
ON simultaneously. Provide a mechanical interlock to prevent simultaneously
contacting of the contacts.
(1) Types and applicable magnetic contactors
Types Applicable magnetic contactors
UT-ML11 S-T10,S-T12,S-T20
UN-ML21 S-T21,S-T25,S-T32
(2) Installation procedures
1) Confirm that combination of the interlock kit and magnetic contactors is correct.
2) Drill mounting holes according to the dimensions as shown in clause (3).
3) Install the interlock kit in both magnetic contactors as shown in clause (4).
4) Fix the magnetic contactors onto mounting surface with screws.
5) Provide a direct electrical interlock mutual to the magnetic contactors as shown in clause (4) for the
reversing type. Use the auxiliary contact on the inner side between the magnetic contactors for the
electrical interlock.
(3) Mounting hole dimensions
Model A'±0.7 A±0.2 B±0.2 C±0.3 D Hole drilling position
S-T10 74 - 60 - M3 E1, E2, E3, E4
S-T12, S-T20 - 35 60 19 M4 E1, E2, E3, E4
S-T21, S-T25 - 54 60 19 M4 E1, E2, E3, E5
S-T32 - 30 60 23 M4 E1, E2, E3, E4
CAUTION
A’
AC
AD screw
E1 F1
F2 E2
F3E3
F4 E4
B

14
(4) Interlock kits mounting procedures
UT-ML11········ T10, T12, T20
UN-ML21 ······· T21, T25, T32
Torque
0.3-0.5 N・m
T10, T12, T20
Interlock kit
Terminal
cover
Removing
Thread fastening
red
black
Wirin
g
Installation and Removing
T21, T25, T32
Coupling block

15
3.3.3 Surge absorber
The varistor (used in the coil , surge absorber , etc.) may emit smoke due to
deterioration. Make sure not to near the product during operation, and always use a
short-circuit protection device such as a fuse on the operating circuit.
A surge will be generated from the contact and coil during switching. Avoid danger by
connecting a surge absorber, etc.
Destruction or fires may occur if the surge absorber is used exceeding the rated
voltage.
(1) Types and applicable magnetic contactors
Types Applicable magnetic contactors
UT-SA21
UT-SA22
UT-SA23
UT-SA25
S-T10,S-T12,
S-T20,S-T21,
S-T25,SR-T5
(2) Applicable voltage range
Rated voltage Recommend applicable
voltage range
Minimum applicable
voltage Remarks
AC 48V AC24～AC50V, DC24～60V AC,DC12V UT-SA25
AC12V, DC12V UT-SA21, UT-SA23, UT-SA25
(CR type UT-SA23 is exclusive for AC)
AC 200V AC100～AC240V, DC100～220V
AC50V, DC60V UT-SA22
AC 400V AC346～480V AC12V UT-SA21
(3) Surge absorber mounting procedures
CAUTION
Installation
[Note]
Tighten the surge absorber
terminal with the coil terminal
Removing Stick
1)
2)
C
li
c
k

16
3.4 Wiring Diagram (representative example)
3.4.1 S-T□
S-T10(1NO) S-T10(1NC)
S-T12, T20 S-T12,T20(2NO)
S-T12, T20(2NC)
S-T21, T25 S-T32

17
3.4.2 S-2
×
T
□
S-2×T10 S-2×T12, T20
S-2×T21, T25
S-2×T32

18
3.4.3 TH-T□(KP)
TH-T18,T25 TH-T18KP,T25KP
3.4.4 MSO-T□(KP)
MSO-T10 MSO-T10KP
MSO-T12, T20 MSO-T12KP, T20KP
MSO-T21, T25 MSO-T21KP, T25KP