Working principle of EN current sensing switch

1. The tested AC wire passes through the through-hole of the switch, and the wire is equivalent to the primary side of the transformer;

2. The internal magnetic core coil induces current in the circuit, generating induced electric energy and simultaneously supplying power to the internal circuit;

3. Pre-set the action current threshold through the potentiometer (CS adjustment knob);

4. Circuit comparison of induced signal magnitude:

✅ Normally open type (M3050): Through-core current < set value → output disconnected; current ≥ set value → output contact closed

✅ Normally closed type (M3056): Through-core current < set value → output is on; current ≥ set value → output contact is disconnected

5. The output is a dry contact switch signal, which is used to connect with PLCs, relays, buzzers, and alarms to achieve linkage, overload monitoring, and current presence/absence determination.

Key points: Only detect AC single live wire, do not test both live wire and neutral wire simultaneously; do not test DC.