What the interrupting ratings mean for panel coordination
The 3VA1132-5EF32-0AA0: The 187 kA at 240 VAC is the maximum fault current this MCCB can safely interrupt at that voltage level — critical for service-entrance or high-fault locations where available short-circuit current exceeds typical 25–65 kA MCCB ratings. At 415 VAC (common in industrial 400 V distribution), the 121 kA figure still provides substantial headroom for most main or feeder breakers. The 17 kA rating at 500 V and 690 V is the limiting case; verify the available fault current at the point of installation against these values to maintain selective coordination downstream.
Thermal-magnetic release and thermal derating
The TM240 designation indicates a thermal-magnetic release with a fixed thermal pickup of 32 A at 40 °C ambient. The breaker holds 32 A continuously up to 50 °C, then derates to 31 A at 55–60 °C and 30 A at 65–70 °C. This matters for panel builders: if the breaker is enclosed in a cabinet with elevated internal ambient, the effective ampacity drops. The power loss at rated current is 10.6 W maximum, which contributes to the enclosure thermal budget.
Physical fit and panel integration
The breaker measures 130 mm high, 76.2 mm wide (3 inches), and 70 mm deep. The 3-pole width matches the standard 3-inch per-pole footprint for SENTRON 3VA MCCBs. Front-face protection is IP40, meaning tools and wires over 1 mm diameter are kept out, but the enclosure is not sealed against moisture. The part does not include a trip indicator, undervoltage release, or communication function — it is a straight thermal-magnetic line-protection device.