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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
A
D screw
E1 F1
F2 E2
F3E3
F4 E4
B
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