Square D Circuit Breaker Zone Selective Interlocking Module
The Square D S434212 is a zone selective interlocking (ZSI) module designed for use with compatible Square D circuit breakers. Zone selective interlocking improves the coordination of overcurrent protective devices in multi-level power distribution systems by allowing downstream breakers to communicate upstream, reducing fault clearing time at the fault location while minimizing unnecessary tripping of upstream devices. This reduces arc flash energy and limits equipment damage during fault events.
Specifications
- Model: S434212
- Type: Zone Selective Interlocking (ZSI) Module
- Compatible with: Square D circuit breakers
- UPC: 78590194193
Applications
- Multi-level power distribution systems requiring selective coordination
- Reducing arc flash incident energy in switchgear and panelboard installations
- Commercial and industrial power distribution systems







