With a breaking capacity of 187 kA at 240 V and 121 kA at 415 V, this MCCB handles high-fault scenarios common in industrial mains and sub-distribution — the 187 kA rating at 240 V is the highest short-circuit current it can safely interrupt without upstream coordination. The overload setting is adjustable from 95 A to 756 A, giving the integrator flexibility to match the breaker to the actual load without swapping the frame.
Breaking capacity drops with system voltage: 187 kA at 240 V, 121 kA at both 415 V and 440 V, 75.6 kA at 500 V, and 3.7 kA at 690 V. The 690 V figure is low — this breaker is not intended for 690 V main feeds; it's sized for 240–500 V distribution where the fault current is within its capability.
Thermal Performance and Derating
Communication and Monitoring
This MCCB includes a communication function and other measurement capability, plus ground-fault monitoring via summation current formation on L + N conductors — useful for remote status and leakage detection without an external relay.