FAQ

The wiring instrument is equipped with two sets of contact wiring terminals as shown in the figure below. A1, B1, C1, A2, B2, C2, N1 are grouped together (used to test the main contact time). A3, B3, C3, A4, B4, C4, N2 are grouped together and can measure six auxiliary contacts or six main contacts. When A3 to C4 are set as auxiliary contacts, the fitting time of the A-phase main and auxiliary contacts is A3-A1, A4-A1 (similarly, the fitting time of the B and C phases is B3-B1, B4-B1, C3-C1, C4-C1), and the common terminals N1 and N2 are used separately.
Attachment:

Normally open auxiliary contact: When the circuit breaker is in the open position, the contact is in the disconnected state; When the circuit breaker is closed, the contacts are closed.
Normally closed auxiliary contact: When the circuit breaker is in the open position, the contact is in a closed state; When the circuit breaker is closed, the contacts are disconnected.