What this MCCB delivers
The Siemens SENTRON 3VA1132-4EF36-0CA0 is a 3-pole molded case circuit breaker rated at 32 A continuous current, with a TM240 thermal-magnetic release for line protection. Its interrupting capacity reaches 121 kA at 240 V AC, dropping to 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V — meaning it handles high-fault scenarios at lower voltages while still clearing substantial faults at distribution-level 690 V. An integrated undervoltage release (UVR) is built in, so the breaker trips automatically when supply voltage drops below the release threshold — useful for preventing motor re-acceleration after a dip or for emergency stop circuits that need a hard shunt.
Thermal derating and panel fit
The breaker holds full 32 A rating from 40 °C up to 50 °C ambient. At 55 °C it derates to 31 A, at 65 °C to 30 A, and holds 30 A through 70 °C — no steep cliff, so a panel running warm still gets most of the capacity. Dimensions are 130 mm height, 76.2 mm width, 70 mm depth; it mounts on a DIN rail or panel plate in a standard SENTRON 3VA footprint. Power loss is 13.1 W maximum, which matters for enclosure thermal calculations when grouping several breakers.
What the ratings mean for your panel
Rated insulation voltage is 800 V, so the breaker is suitable for 690 V AC systems with margin. The TM240 thermal-magnetic release provides fixed thermal pickup (for overload protection) and magnetic instantaneous trip (for short-circuit protection) — no adjustment dials, which simplifies specification but means the trip curve is fixed. No ground-fault monitoring module is included; if GFP is needed, an external module or a different 3VA variant with that option would be required. The UVR is an undervoltage release, not a shunt trip — it trips when voltage falls below a set level, not when a control signal is applied. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.