What this MCCB is and what it does
The Siemens 3VA1132-5ED42-0AA0 is a SENTRON-series molded case circuit breaker (MCCB) designed for line protection in distribution panels. It's a 4-pole unit rated 32 A continuous at 40 °C ambient, with a TM210 thermal-magnetic overcurrent release that handles both overload and short-circuit trip curves in one package. Breaking capacity is the headline number here: 187 kA at 240 V AC, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. That 187 kA at 240 V means this breaker can safely interrupt a fault current up to that level without welding contacts or venting plasma into the panel — critical for high-fault installations like transformer secondaries or large motor control centers. Rated insulation voltage is 800 V. Power dissipation maxes out at 10.6 W.
Mounting and panel fit
Footprint is 101.6 mm wide by 130 mm tall by 70 mm deep — a standard MCCB envelope that drops into most Siemens SENTRON distribution boards and third-party enclosures with a 4-pole cutout. Front IP40 means it's protected against tools and wires >1 mm, fine for indoor panel mounting but not washdown areas. No undervoltage release, no voltage trip, no communication module, and no ground-fault monitoring on this variant — it's a straight thermal-magnetic line protection breaker. If you need shunt trip or aux contacts, you're looking at a different suffix in the 3VA1 family.
Thermal derating and operating range
Rated current holds at 32 A from 40 °C through 50 °C, then gently steps down: 31 A at 55 °C and 60 °C, 30 A at 65 °C and 70 °C. That's a shallow derating curve — you don't lose much headroom in a warm panel. Ambient operating range is -25 °C to 70 °C, storage from -40 °C to 80 °C.