The Siemens 3VA2040-8JP36-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 40 A continuous current across the full ambient range from -40 °C to 70 °C, with no derating needed. It's a 3-pole unit built for line protection, carrying interrupting ratings that climb to 440 kA at 240 V — that's serious fault-clearing headroom for high-capacity distribution panels.
Interrupting ratings and selectivity
This breaker's interrupting capacity drops as voltage rises: 440 kA at 240 V, 330 kA at 415 V and 440 V, 220 kA at 500 V, and 53 kA at 690 V. For a 40 A frame, those numbers give you wide selectivity margins downstream — you can coordinate with smaller branch breakers without worrying about nuisance tripping on a fault upstream. The ETU550 electronic trip unit is adjustable, with short-time delay (tsd) settings from 0.5 s to 0.5 s, and thermal memory for repeated faults.
Integration and mounting
The breaker measures 105 mm wide, 181 mm tall, and 86 mm deep — it fits a standard MCCB panel footprint with bolt-on or plug-in mounting options. The front face carries an IP40 protection rating, so it's fine for enclosed panels but not for washdown environments. Communication function is built in, which simplifies integration with a BMS or power monitoring system without an external module.