What this MCCB is and what the ratings mean for fit
The Siemens 3VA1132-4ED26-0AA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries 2 poles, rated 32 A at 40 °C ambient, with a TM210 thermal-magnetic overcurrent release — meaning the thermal element handles overloads and the magnetic element handles short-circuits, no electronic trip unit inside. The breaking capacity is 121 kA at 240 V AC and 75.6 kA at 415 V AC, which gives solid fault-clearing headroom for most industrial secondary distribution boards. The IP40 front protection keeps dust out of the enclosure face but doesn't seal the terminals — mount it in a clean, dry panel.
Thermal derating — what the 40–70 °C table tells you
This MCCB holds its full 32 A rating from 40 °C up to 50 °C. At 55 °C it derates to 31 A, at 65 °C to 30 A, and at 70 °C still carries 30 A. That's a shallow curve — only 2 A lost over a 30 °C rise — so it's well suited for a warm panel near a kiln or furnace line where ambient climbs but you can't oversize the breaker. The maximum operating temperature is 70 °C, storage from -40 °C to 80 °C.
Panel fit and integration notes
The breaker measures 70 mm deep, 50.8 mm wide, and 130 mm high. That 50.8 mm (2-inch) width per pole is standard for SENTRON 3VA MCCBs — it occupies roughly two 18 mm module spaces on a DIN rail. Maximum power loss is 7.06 W, so no special ventilation is needed in a typical steel enclosure. No undervoltage release, no ground-fault monitoring, no communication function — this is a plain thermal-magnetic line-protection breaker.