What this MCCB does on the line
The Siemens 3VA1132-5EF36-0JC0 is a 3-pole SENTRON molded case circuit breaker rated for 32 A continuous current at 40 °C, with a TM240 thermal-magnetic release that handles both overload and short-circuit protection in one package. The interrupting capacity hits 187 kA at 240 V, 121 kA at 415 V, and still delivers 75.6 kA at 440 V — numbers that put it solidly in high-fault-duty panels where upstream transformer or bus capacity is substantial. The shunt trip (STL) release and two auxiliary switches HQ are built in, so you get remote tripping capability and status feedback without adding external modules.
Derating reality — where the 32 A holds and where it drops
The 32 A rating holds flat from 40 °C through 50 °C. At 55 °C it drops to 30.72 A, at 60 °C to 30.08 A, at 65 °C to 29.44 A, and at 70 °C to 28.8 A. That matters if this breaker lands in a crowded enclosure with other heat sources — the thermal-magnetic element responds to ambient, so you need to account for the real panel internal temperature, not the room setpoint. The rated insulation voltage is 800 V, and the front face carries IP40 protection — fine for a clean indoor panel, not for washdown zones.
Panel fit — dimensions and mounting
The case measures 130 mm high, 76.2 mm wide, and 70 mm deep. That 70 mm depth is the key number for gland-plate clearance and cover clearance in shallow enclosures. Three-pole footprint, front IP40. No communication module, no ground-fault monitoring, no undervoltage release on this variant — it is a straight thermal-magnetic line-protection breaker with shunt trip and auxiliary contacts. If the BOM calls for phase-failure detection or a separate UVR coil, this is not that version.