Siemens SENTRON 3WA1 - ZSI200 Zone Selective Interlocking Module; Description

Accessories
4.11 Accessories for the ETU300 and ETU600 electronic trip units
3WA1 air circuit breaker
360 Equipment Manual, 02/2023, 92310000002-06
4.11.7 ZSI200 zone selective interlocking module
4.11.7.1 Description
The load on a power distribution system can be reduced under short-circuit and ground
fault conditions when circuit breakers are used in a ZSI system.
Short-circuits and ground faults are disconnected after a short delay, independently of
the coordination of the response characteristics of the circuit breakers. The zone
selective interlocking feature allows full selectivity to be achieved with a low break time.
This increases the supply reliability of the non-faulty feeders. You can find detailed
information in Chapter Zone-selective interlocking ZSI (Page 187).
(1)
CubicleBUS² connection
(4)
LEDs port A and port B
(2)
Power supply connection
(5)
LED CUB (CubicleBUS²)
(3)
ZSI interfaces port A and port B
(6)
ACT LED (Active)
The ZSI200 zone selective interlocking module has two ZSI interfaces:
• Port A
• Port B
Active interfaces are signaled via the LEDs port A and port B.