Note 1: The normally closed contacts (2 #, 22 #) of relay J1 in the figure are used as tripping protection sub contactors, while the normally open contacts (22 #, 23 #) of J1 can be used as alarm relays J2 As a programmable relay, it is commonly used as an alarm relay. When the protector has communication function, the relay can be connected to both ends of the start button in parallel via J2 to enable IR Used for startup
Note 2: The MCT in the diagram is a protective device with a built-in current transformer, with a current specification of ≤ 400A. The cables of the three-phase main line are threaded in the same direction once, and the MCT leads out the wires The built-in 4-core terminal is directly plugged into the three-phase electrical input port (4I # 46 #) of the protection panel, when the rated current of the motor is> At 400A, three-phase main line Three external protection CTs (P1 in, P2 out) were discarded in advance for the cable, and the 5A current lines on the secondary side of the three external CTs were defined as MCT abandonment holes in the same direction One turn passes through the three-phase hole of protector MCT6.3
Note 3: When selecting the leakage protection function, a suitable residual current transformer with a suitable threading aperture should be selected (the motor circuit A, B, and C three-phase lines should pass through the residual electricity of the distribution transformer at the same time) Current transformers.