MCCB for line protection with shunt trip
Rated 50 A continuously at 40 °C, it delivers a 121 kA interrupting capacity at 240 V — the figure that governs fault clearance on a 240 V line side.
At 415 V the interrupting rating is 75.6 kA; at 440 V it drops to 52.5 kA, and at 500 V and 690 V it holds at 11.9 kA. For a 400 V three-phase panel, the 75.6 kA figure gives headroom above typical 25–50 kA available fault currents, so selectivity coordination with an upstream feeder breaker is straightforward.
At 55 °C it derates to 49 A, at 60 °C to 48 A, at 65 °C to 46 A, and at 70 °C to 45 A.
The 76.2 mm width (3 inches) is the standard 3-pole MCCB footprint for a 200 A frame — it occupies three 25 mm DIN positions if base-mounted, or bolts directly to a mounting plate. Depth of 70 mm leaves clearance behind a 120 mm deep enclosure door. No undervoltage release or communication module is fitted on this variant.