32 A MCCB with undervoltage release — line protection for distribution panels
The Siemens SENTRON 3VA1132-3EF36-0CH0 is a 3-pole molded case circuit breaker rated 32 A at 40 °C, with a breaking capacity of 75.6 kA at 240 V. It is designed for line protection in distribution panels, meaning it sits on the feeder side to protect cables and busbars against overloads and short circuits. The built-in undervoltage release (UVR) automatically trips the breaker when supply voltage drops below a threshold — a standard requirement for safety circuits that need to drop loads on loss of control power. Rated current holds flat at 32 A from 40 °C through 50 °C, then derates to 30 A at 70 °C. That thermal stability means the breaker doesn't lose headroom in a warm panel unless ambient pushes past 55 °C. The 75.6 kA interrupting rating at 240 V gives ample SCCR headroom for most North American distribution transformers; at 415 V it still clears 52.5 kA, and at 690 V it holds 11.9 kA.
Physical fit and panel integration
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep. Width of 76.2 mm (3 inches) matches the standard 3-pole MCCB footprint for DIN-rail or panel-mount installation. The included undervoltage release and auxiliary switch configuration (2 auxiliary switches + 1 trip alarm switch HQ) add wiring points that need to be accounted for in the panel layout — plan for the additional terminal space alongside the main power lugs.
Approvals and compliance documentation
Rated insulation voltage is 800 V, and the breaker carries a -25 °C to 70 °C operating range with -40 °C to 80 °C storage limits. The SENTRON series holds UL, CSA, and IEC certifications standard for panelboard and distribution applications. Compliance documentation (RoHS, REACH, UL file, IEC test reports) is available through the manufacturer's documentation portal — the breaker itself carries the CE and UKCA marks for European and UK markets.