What this MCCB does on the line
The Siemens SENTRON 3VA1150-5ED46-0AA0 is a 4-pole molded case circuit breaker rated for 50 A continuous current (Iu) at 40 °C, with a TM210 thermal-magnetic overcurrent release for line protection. It interrupts fault currents up to 187 kA at 240 V AC and 121 kA at 415 V AC — that SCCR headroom means it clears high-energy faults without cascading upstream, critical for panel coordination studies. Rated insulation voltage is 800 V, operating voltage up to 690 V AC. The 70 mm depth and 101.6 mm width fit standard MCCB panel cutouts; IP40 on the front keeps dust out of the enclosure face.
Thermal derating and real-world current
The 50 A rating holds flat from 40 °C up to 50 °C. At 55 °C it derates to 49 A, at 60 °C to 48 A, at 65 °C to 46 A, and at 70 °C to 45 A. If the panel ambient runs hot — say a sealed enclosure near a furnace line — the 45 A floor at 70 °C still gives you margin on a 40 A continuous load. The TM210 release is fixed thermal-magnetic; no electronic adjustment, so coordination settings are mechanical.
Panel fit and mounting
The 3VA1150-5ED46-0AA0 mounts into a standard MCCB panel cutout. Depth of 70 mm and width of 101.6 mm mean it occupies the same footprint as other 4-pole SENTRON frames in the 3VA series. No DIN-rail clip — it bolts to the mounting plate. The IP40 front face keeps the breaker handle and nameplate accessible through the enclosure door.