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10.2 Wiring diagram
(1) 3-wire control circuit
(2) 2-wire control circuit
In 2-wire control circuits, be careful of the following points when using thermal overload relay with setting reset
button to auto reset mode. If over-current flows, which is not large enough to blow the fuse or to operate the circuit
breaker, the magnetic contactor repeats make/break operations. It does this because the thermal overload relay
repeats the resets and the trips automatically. This repeated make/break operations would damage the magnetic
contactor and the thermal overload relay. Eventually, contact welding short-circuit (phase to phase) or grounding
occur, and the fuse blow or circuit breaker operate. In this case, check the magnetic contactor and the thermal
overload relay. Replace them if they have been damaged.
Master SW
by customer
Summary of Contents for TK13
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