Siemens 3VA1050-3ED32-0AD0 — 50 A SENTRON MCCB with TM210 Release
The Siemens 3VA1050-3ED32-0AD0 is a SENTRON molded case circuit breaker (MCCB) rated for 50 A continuous current at 40 °C, with a TM210 thermal-magnetic overcurrent release and three poles. It carries 75.6 kA interrupting capacity at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V — figures that define its fault-clearing capability at the panel's service voltage. The TM210 release is a fixed, non-adjustable thermal-magnetic trip unit — no field-configurable long-time or short-time pickup. That makes this a line-protection breaker for straightforward feeder or branch circuits where coordination studies don't require adjustable trip settings. Rated insulation voltage is 800 V, and the breaker carries 3 auxiliary switches (HQ type) for remote status indication. No undervoltage release, no shunt trip, no ground-fault monitoring, and no communication module are fitted — this is a basic interrupting device, not a smart breaker.
Thermal Derating and Ambient Temperature
The 50 A rating holds from 40 °C through 50 °C. Above that, the continuous current must be derated: 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. If the panel ambient runs above 50 °C, size the breaker for the derated value — not the nameplate 50 A. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The IP40 front protection means the breaker face is sealed against tools and small objects but not against moisture — keep it inside a rated enclosure.
Physical Fit and Panel Integration
The breaker measures 130 mm high, 76.2 mm wide, and 70 mm deep. The 76.2 mm width is a standard 3-pole MCCB footprint for DIN-rail or panel-mount installation — verify the mounting base and bus-bar spacing against the existing panel layout. Latching endurance is rated at 15,000 operations — a figure that governs mechanical life under normal switching, not fault interruption. For frequent switching duty, consider a contactor ahead of this MCCB.