What this MCCB carries and where it fits
The Siemens SENTRON 3VM1450-4ED32-0AA0 is a 3-pole molded case circuit breaker rated for 500 A continuous current across a 40 °C to 50 °C ambient — no derating needed in that band. Above 50 °C the rating steps down linearly: 488 A at 55 °C, 476 A at 60 °C, 464 A at 65 °C, and 452 A at 70 °C. Breaking capacity is specified per voltage: 121 kA at 240 V AC, 76 kA at 415 V and 440 V AC, and 53 kA at 500 V AC. That gives solid fault-clearing headroom for most low-voltage distribution panels on common industrial supply voltages. It uses a TM210 thermal-magnetic overcurrent release — a fixed-trip design with no electronic adjustment, suited for straightforward line protection where you want a reliable, non-programmable trip curve. Insulation voltage is rated 800 V, operating voltage up to 690 V AC. The front face carries IP40 protection — fine for enclosed panel mounting where the breaker is behind a door.
Physical fit and panel integration
Dimensions are 248 mm high, 138 mm wide, 110 mm deep. That 110 mm depth (4.33 in) is the projection behind the panel face — check your enclosure depth before committing the mounting plate. No undervoltage release, no shunt trip, no communication function, no ground-fault monitoring on this variant — it is a straight thermal-magnetic breaker with no auxiliary electronics. The trip indicator is also absent, so visual trip status comes from the handle position only.
Lifecycle and sourcing
Power loss at full load is 123 W maximum — factor that into panel thermal calculations if the breaker is in a sealed enclosure with other heat sources. Storage temperature range is -40 °C to 80 °C; operating ambient is -25 °C to 70 °C. The storage spec governs handling and warehousing, not running conditions.