SD (trip indication) and SDE (fault-trip indication) are the indication contacts for compact NSX, but the function for trip are different.

SD (trip indication) indicates that the circuit breaker has tripped due to:

• an overload
• a short-circuit
• an earth fault (Vigi) or a ground fault (Micrologic 6)
• operation of a voltage release
• operation of the "push to trip" button
• disconnection when the device is ON.

The SD contact returns to de-energised state when the circuit breaker is reset.

SDE (fault-trip indication) indicates that the circuit breaker has tripped due to:

• an overload
• a short-circuit
• an earth fault (Vigi) or a ground fault (Micrologic 6).

ComPacT NSX100/160/250 circuit breakers and switch-disconnectors

Released for:Schneider Electric Thailand