The Siemens 3VA1132-3EF32-0JA0 is a 3-pole SENTRON molded case circuit breaker (MCCB) rated for 32 A at 40 °C, with a TM240 thermal-magnetic overcurrent release and an integrated shunt trip (STL) auxiliary release. It is designed for line protection in distribution panels and motor control centers, where the shunt trip allows remote or emergency-off tripping via a control voltage. Breaking capacity reaches 75.6 kA at 240 V AC, 52.5 kA at 415 V, and 32 kA at 440 V, tapering to 11.9 kA at both 500 V and 690 V. This SCCR profile covers most industrial low-voltage fault levels, and the 800 V rated insulation voltage confirms suitability for 690 V systems with adequate clearance.
Thermal derating and panel fit
At 55 °C the continuous rating derates to 31 A, and at 65 °C to 30 A. The 70 mm depth and 76.2 mm width fit standard 3-pole MCCB mounting footprints in distribution boards; the 130 mm height leaves clearance for cable entry from above or below. Maximum power loss is 10.6 W. In a sealed enclosure with multiple breakers ganged, this heat adds up — account for it in the thermal budget, especially above 50 °C where the derating curve starts to bite.
Sourcing and lifecycle
For a BOM line that needs this exact shunt-trip variant, the order code is the one to specify — the base breaker without the shunt trip is a different code, and adding a field-installed shunt trip later costs more in labor and panel rework.