⚡ Zone Selective Interlocking (0.05s Instantaneous Main Trip via Restraint Signal)

Zone Selective Interlocking (ZSI) Calculator

Coordinate Zone Selective Interlocking (ZSI) hardwired communication restraint networks between main, tie, and feeder electronic trip circuit breakers: calculate fault clearing time reductions (clearing main switchboard bus ground faults in 50ms instantaneously when no downstream restraint signal is detected while preserving downstream selectivity), and arc flash safety margins.

1. Project & Operating Inputs

Switchboard Breakers in ZSI Scheme (Breaker Count e.g. 16 Breakers)

Arched Fault Incident Energy Cut (% e.g. 75.0% Incident Energy Reduction)

Customer Bid Price for ZSI Hardwiring, Programming & Certification ($)

Belden ZSI Shielded Cable, Secondary Injection Test Rig, Relay Engineer ($)

2. Financial Breakdown & Yield

ZONE SELECTIVE INTERLOCKING

Turnkey ZSI Commissioning Profit

Power Systems Coordination Margin

0.0%

Gross Revenue / Bill

Total Project CapEx

Operating / Material Cost