Siemens SENTRON 3VA1140-5EE36-0AA0 — 40 A MCCB, Line Protection, TM220 Trip Unit
The Siemens SENTRON 3VA1140-5EE36-0AA0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying a continuous current of 40 A across its full ambient temperature range from 40 °C to 50 °C, with minor derating to 37 A at 70 °C. The TM220 thermal-magnetic overcurrent release provides fixed thermal and magnetic trip settings, suitable for protecting cable and distribution circuits against overload and short-circuit faults without the need for adjustment. Interrupting capacity reaches 187 kA at 240 VAC, 121 kA at 415 VAC, and 75.6 kA at 440 VAC, with a floor of 17 kA at 500 V and 690 VAC — sufficient for high-fault panelboards and main distribution switchboards where SCCR headroom is critical.
Mounting and Integration — DIN-Rail Panel Fit
The breaker occupies a 76.2 mm wide, 130 mm tall, 70 mm deep footprint — three standard 25 mm DIN-rail module widths — and mounts directly onto a DIN rail in the distribution panel. Front face carries an IP40 protection rating, meaning tools and fingers are kept out, but the enclosure is not sealed against moisture — suitable for indoor panel installation only. Rated insulation voltage is 800 V, so the breaker can be applied in 480/277 V and 600 V systems with full voltage withstand margin. Maximum power loss at rated current is 10.8 W — factor this into the panel thermal budget when stacking multiple breakers in a closed enclosure.