Siemens 3VA1050-4ED32-0BC0 — SENTRON MCCB, 50 A, Line Protection
The Siemens 3VA1050-4ED32-0BC0 is a SENTRON molded case circuit breaker (MCCB) for line protection, rated at 50 A continuous current (Iu) across 40 °C to 50 °C ambient — no derating needed in a typical 40 °C panel. At 55 °C it holds 48 A, and at 70 °C it carries 45 A, so the thermal curve starts to bite above 50 °C; a panel builder should check the ambient at the breaker location if the enclosure runs hot. Rated insulation voltage is 800 V (Ui), and the interrupting ratings are 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V — that 121 kA at 240 V means it can clear a massive fault on a 240 V distribution bus without upstream coordination issues, while the 690 V figure (11.9 kA) is the limit for higher-voltage industrial loads. Three poles, no trip indicator, no voltage trigger, no communication module — it is a straightforward line-protection breaker with an undervoltage release (UVR) and 2 auxiliary switches (HQ type). The overcurrent release is a TM210 — a thermal-magnetic unit with a fixed thermal rating and magnetic trip setting. No ground-fault monitoring, no phase-failure detection, no other measurement function. The integrated auxiliary trip is order code 3VA9608-0BB11 (sold separately).
Physical Fit and Compliance
Dimensions: 70 mm depth, 76.2 mm width, 130 mm height — standard 3-pole MCCB footprint for SENTRON 3VA frames. The front face carries IP40 protection; the busbar connections are exposed (typical for panel-mount MCCBs). Mounts on a DIN rail or direct panel with the appropriate adapter. Storage temperature range -40 °C to 80 °C; operating range -25 °C to 70 °C. Reference code per DIN EN 81346-2 is Q.