What this MCCB carries — and what that means for your panel
The Siemens SENTRON 3VA1132-5EF36-0DA0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection, fitted with a TM240 thermal-magnetic release and an integrated undervoltage release (UVR). Rated 32 A continuous at 40 °C, it holds that full rating through 50 °C before a mild derating curve begins — 31 A at 55 °C, 30 A at 70 °C — so in a well-ventilated 40 °C panel you get the full 32 A without headroom loss. Breaking capacity is the standout number here: 187 kA at 240 V AC, dropping to 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at 500 V and 690 V. That 187 kA at 240 V puts this MCCB into high-fault-duty applications — think large transformer secondaries or busway feeds where available fault current is well above a standard 65 kA or 100 kA rated breaker. The 17 kA floor at 500/690 V is still adequate for most 690 V industrial distribution. Rated insulation voltage is 800 V, which covers 480/600 V class systems with margin. Power loss at rated load is 13.1 W — modest for a 32 A frame, meaning the heat load inside a sealed enclosure stays manageable. The undervoltage release trips the breaker when control voltage drops below a threshold, a common requirement for safety circuits and emergency-stop chains.
Physical fit and panel integration
Dimensions: 130 mm height, 76.2 mm width (3 inches), 70 mm depth. The 3-inch width is standard for a 3-pole SENTRON 3VA frame — it occupies the same footprint as other 3VA 3-pole breakers, so swapping between variants in a panel layout requires no busbar or DIN-rail rework. Mounting is via the rear screw terminals; no DIN-rail clip on this frame, so plan for direct panel mounting or a mounting plate. The 70 mm depth is shallow enough to fit standard 200 mm deep enclosures with clearance for outgoing cables and a deadfront cover. No communication function or ground-fault monitoring on this variant — it's a pure thermal-magnetic line protection breaker with undervoltage release, no auxiliary contacts or shunt trip included.