125 A MCCB with TM240 trip — active line protection
The Siemens 3VA1112-3EF36-0KH0 is a SENTRON molded case circuit breaker (MCCB) rated for line-protection duty with a continuous current Iu of 125 A at 40 °C, holding that rating through 50 °C before beginning a gentle thermal derating curve — 120 A at 55 °C, 117.5 A at 60 °C, 115 A at 65 °C, and 112.5 A at 70 °C. Breaking capacity runs 75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, and 10.5 kA at 690 V — high enough for most industrial service-entrance or feeder applications where the available fault current is known and documented.
Three-pole footprint: 76.2 mm wide, 130 mm tall, 70 mm deep — standard SENTRON 3VA1 form factor that drops into existing DIN-rail or screw-mounted panel layouts without re-drilling.
Environmental and compliance profile
Front-face protection is IP40.