What this 3VA MCCB carries and where it fits
The Siemens SENTRON 3VA1132-4EF32-0AE0 is a 3-pole molded case circuit breaker rated for 32 A continuous current (Iu) with a TM240 thermal-magnetic release. The 121 kA breaking capacity at 240 V means it can safely interrupt a fault current that high without welding contacts or cascading upstream — sized for high-fault panelboards and transformer secondaries where the available fault current is substantial. At 415 V the interrupting rating is 75.6 kA, at 440 V it is 52.5 kA, and at 690 V it drops to 11.9 kA. That voltage-dependent curve is typical of MCCBs; the 690 V figure governs if the breaker lands on a 690 V line, so confirm your system voltage against the rating that applies. The TM240 release is fixed thermal-magnetic — no electronic adjustment, no communication module, no undervoltage or shunt trip fitted from the factory. It ships with four HQ auxiliary switches for status feedback back to a PLC or annunciator panel. This is a line-protection version, meaning it is configured for feeder and distribution protection rather than motor-circuit duty. If you are protecting a motor branch, check whether the TM240's magnetic pickup aligns with the motor's inrush — the datasheet's time-current curve is the final word.
Thermal derating — what the 32 A rating actually means at panel ambient
The 32 A rating holds from 40 °C through 50 °C ambient. At 55 °C it derates 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. If the panel ambient runs above 50 °C — common in a packed enclosure next to a drive or transformer — the continuous load must be backed off accordingly. The operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The storage limit governs shelf life, not running duty.
Panel fit — dimensions and mounting
The 3VA1132-4EF32-0AE0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. The 76.2 mm width is a standard 3-pole MCCB footprint — three 25.4 mm pole pitches — so it drops into the same DIN-rail or screw-mount space as other 3-pole SENTRON 3VA breakers. The IP40 front protection means the face is splash-resistant but the terminals are not sealed; mount it inside a panel, not in a washdown zone.