MCCB for line protection with undervoltage release
The Siemens SENTRON 3VA1132-4EF32-0DA0 is a 3-pole molded case circuit breaker (MCCB) rated 32 A at 40 °C, designed for line protection. It carries a 121 kA breaking capacity at 240 V and 75.6 kA at 415 V, which means it can safely interrupt high fault currents on a 400 V panelboard without needing an upstream current-limiting fuse. The TM240 thermal-magnetic trip unit gives a fixed thermal pickup of 32 A and a magnetic trip threshold of 240 A — the magnetic setting is 7.5x the rated current, so it handles motor inrush without nuisance trips on pump or compressor starts. An undervoltage release (UVR) is built in, so if the control voltage drops below its dropout threshold the breaker opens — this is standard for safety circuits where a loss of control power must kill the load. The insulation voltage is rated 800 V, which covers 690 V line-to-line systems with margin. Power loss at full load is 13.1 W, manageable in a closed panel if you keep the ambient below 40 °C.
Physical fit and panel integration
The breaker measures 76.2 mm wide, 130 mm tall, and 70 mm deep — a standard 3-pole MCCB footprint that drops into a SENTRON panelboard or a DIN-rail adapter without re-drilling. The 70 mm depth means it clears a 100 mm deep enclosure with room for wiring gutters. No communication module or ground-fault monitoring is fitted on this variant; it's a straight line-protection device with the UVR as the only auxiliary release.