The Siemens 3VA1132-4EF36-0BH0 is a SENTRON molded case circuit breaker (MCCB) configured for line protection, carrying a 32 A rated continuous current (Iu) that holds across ambient temperatures from 40 °C through 50 °C before derating begins — at 55 °C it's still good for 30.72 A, and at 70 °C it delivers 28.8 A. That thermal stability matters when the breaker sits in a crowded panel near other heat sources.
Interrupting capacity and selectivity
The interrupting ratings climb to 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. That 121 kA figure at 240 V gives headroom for high-fault utility feeds or transformer-secondaries where the available fault current is stiff — you can coordinate downstream without cascading the main breaker open on a branch fault. Rated insulation voltage Ui is 800 V, which covers 480/277 V and 600 V delta systems with margin. The 3-pole design uses a TM240 thermal-magnetic overcurrent release — the thermal element handles overloads, the magnetic element clears short-circuits. No electronic trip unit here, so no auxiliary power needed for the trip logic.
Integrated undervoltage release and auxiliary contacts
This variant ships with an undervoltage release (UVR) built in — part of the auxiliary release design — so the breaker trips if control voltage drops below the dropout threshold. That's a common requirement for safety circuits or emergency-stop chains where loss of control power must open the main disconnect. The auxiliary contact block provides 2 auxiliary switches plus 1 trip alarm switch (HQ configuration), giving status feedback for PLC inputs or panel indication.
Mounting and environment
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth — fits standard SENTRON 3VA panel cutouts and busbar systems. Front face carries IP40 protection, so it's splash-resistant from the front but not sealed for washdown. Operating temperature range spans -25 °C to 70 °C; storage range extends from -40 °C to 80 °C. The latching endurance is rated at 15,000 operations, which is typical for a distribution MCCB — not a switching-duty device, but fine for infrequent manual operation and fault clearing.