MCCB for line protection — 125 A, 4-pole, TM240 release
Its TM240 thermal-magnetic release provides fixed overload and short-circuit protection without adjustable trip settings — a straightforward choice for feeder circuits where coordination studies have already locked in the pickup. The interrupting capacity reaches 187 kA at 240 V AC, 121 kA at 415 V, and 75.6 kA at 440 V, so it handles high-fault scenarios common in industrial mains without cascading upstream.
At 40 °C the breaker carries the full 125 A; derating begins above 55 °C, dropping to 243 A at 55 °C and 223 A at 70 °C. The 70 mm depth and 140 mm width fit standard MCCB panel footprints — verify gland-plate clearance against the existing cutout before committing the BOM. Maximum power loss of 57 W means the enclosure must dissipate that heat; adjacent devices in a sealed cabinet may need spacing or forced ventilation.
The supplied basic switch carries order code 3VA12255FF420AA0 — relevant when ordering spare internal mechanisms.