Rated current and thermal derating
The Siemens 3VA1112-6EF36-0JC0 SENTRON molded case circuit breaker carries a continuous current rating of 125 A at 40 °C ambient, holding that rating through 50 °C. Above that, the thermal trip curve derates: 122 A at 55 °C, 120 A at 60 °C, 117 A at 65 °C, and 114 A at 70 °C. For a panel builder, that means if this breaker lives in a non-ventilated enclosure near other heat sources, the 70 °C derated figure (114 A) is the safe continuous load limit — not the nameplate 125 A.
Breaking capacity by system voltage
This 3-pole MCCB delivers a massive 220 kA interrupting capacity at 240 V, dropping to 154 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. For a site electrical engineer sizing for SCCR compliance: at a typical 480 V distribution, the 75.6 kA rating gives substantial headroom above most transformer-fed fault currents, meaning this breaker can sit at the main without needing a current-limiting fuse upstream.
Line protection design with integrated shunt trip
The 3VA1112-6EF36-0JC0 is designed for line protection (feeder protection) rather than motor or generator protection. It ships with a shunt trip (STL) auxiliary release and two HQ auxiliary switches built in. The shunt trip allows remote tripping from a PLC or emergency-stop circuit — useful for a controls integrator wiring a safety circuit that needs to drop the main feeder on a zone stop. The basic switch supplied is order code 3VA11126EF360AA0.
Physical footprint and panel integration
At 70 mm deep, 76.2 mm wide, and 130 mm tall, this 3-pole MCCB fits a standard SENTRON panel footprint. The 76.2 mm width (3 inches) matches the standard 3-pole MCCB slot in most Siemens distribution panels. Depth at 70 mm (2.76 inches) is shallow enough to clear a 100 mm deep gland plate without box-outs. No undervoltage release, no communication module, no ground-fault monitoring — this is a straight feeder breaker with remote trip capability.
Environmental and electrical ratings
Rated insulation voltage is 800 V, giving headroom for 690 V systems. Operating temperature range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C. Maximum power loss at rated current is 28.1 W — relevant for a panel designer calculating thermal rise in a sealed enclosure. No trip indicator, no undervoltage release, no communication function, and no ground-fault monitoring on this variant.