MCCB for line protection
The Siemens SENTRON 3VA1032-4ED36-0AF0 is a 3-pole molded case circuit breaker (MCCB) designed for line protection — not motor protection, not ground-fault monitoring. It carries a TM210 thermal-magnetic overcurrent release and a trip indicator that gives a clear visual signal when it has opened. Rated insulation voltage is 800 V, so it comfortably handles 400/480 V distribution panels.
Rated current and thermal derating
Rated current holds at 32 A from 40 °C through 50 °C. At 55 °C it derates to 31 A, and at 70 °C it is 30 A. That means in a warm panel — say 50 °C ambient — you still get full 32 A continuous. Only above 55 °C does the available current drop, and only by 1–2 A. This is a solid thermal curve for a 32 A frame; no surprise derating below 50 °C.
Interrupting capacity across voltages
Breaking capacity is 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and still 11.9 kA at 690 V. That 121 kA at 240 V makes this breaker suitable for high-fault locations like service-entrance panels where the available short-circuit current is high. Even on a 415 V system, 75.6 kA covers most industrial distribution boards without needing a current-limiting upstream breaker.
Dimensions and panel fit
Width 76.2 mm (3 in), height 130 mm (5.12 in), depth 70 mm (2.76 in). That 70 mm depth is compact for a 3-pole MCCB with this interrupting rating — it fits standard 200 mm deep enclosures without crowding the door. The auxiliary switch configuration supplied is 1 auxiliary switch + 1 trip alarm switch (HQ design), which gives both a NO/NC signal for status and a dedicated alarm contact that closes only on a trip event.