Line protection MCCB with undervoltage release
The Siemens SENTRON 3VA1110-5EE32-0BC0 is a 3-pole molded case circuit breaker (MCCB) rated at 100 A, designed for line protection in distribution panels. It carries a 187 kA interrupting capacity at 240 VAC, derating to 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V — so the available fault current at the installation point determines which voltage tap you use it on. The thermal curve holds a full 100 A from 40 °C through 50 °C, then steps down: 98 A at 55 °C, 96 A at 60 °C, 94 A at 65 °C, and 91 A at 70 °C. That derating matters if this breaker sits in a non-ventilated enclosure near other heat sources. This variant ships with an integrated undervoltage release (UVR) and two HQ auxiliary switches — the UVR trips the breaker when control voltage drops below a threshold, which is common in emergency-stop chains or upstream loss-of-mains protection schemes. The basic switch core is order code 3VA11105EE320AA0, so if you need a replacement internal mechanism that's the sub-assembly to reference.
Panel fit and mounting
Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a standard 3-pole MCCB footprint that drops into SENTRON distribution boards and most DIN-rail or screw-mount enclosures without re-drilling. Rated insulation voltage is 800 V, so it's cleared for 690 VAC line-to-line systems with margin. Maximum power loss at rated load is 27.5 W; factor that into enclosure thermal calculations if you're packing multiple breakers in a sealed cabinet.