Siemens SENTRON 3VA1050-4ED36-0AH0 – 50 A MCCB, TM210 Release, Line Protection
The Siemens 3VA1050-4ED36-0AH0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection, rated at 50 A at 40 °C with a TM210 thermal-magnetic release. It carries a breaking capacity of 121 kA at 240 V and 75.6 kA at 415 V, making it suited for high-fault-current industrial distribution panels where selectivity and SCCR headroom are critical. The TM210 release provides fixed thermal and magnetic trip settings — the thermal element handles overloads, the magnetic element clears short-circuits. This is a line-protection design, not a motor-protection or ground-fault variant, so it goes on feeder or branch circuits where the load is resistive or general-purpose, not on individual motor starters requiring adjustable overloads.
Key Ratings and What They Mean for Panel Fit
Rated current holds at 50 A from 40 °C through 50 °C ambient, then derates to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. In a warm enclosure — say a non-ventilated panel near a curing press or furnace — the 50 °C rating is the one to size against; at 70 °C you lose 5 A of headroom. Breaking capacity drops with system voltage: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V. For a 480 V panel (common in North American industrial), the 52.5 kA at 440 V is the closest published figure; the 11.9 kA at 500 V and 690 V means this breaker is not the first choice for 600 V class installations unless the available fault current is well under 12 kA. Rated insulation voltage is 800 V, and the breaker carries 3 poles with a TM210 release. It ships with 2 auxiliary switches plus 1 trip alarm switch (HQ configuration), which covers status feedback to a PLC or annunciator without needing a separate aux block. Maximum power loss is 14.6 W per pole — figure about 44 W total heat dissipated inside the enclosure at full load. That matters for thermal budgeting in a sealed stainless steel panel on a food line or a crowded cabinet with multiple breakers stacked.
Integration Notes
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth. The 3-pole footprint fits standard Siemens SENTRON 3VA panelboard and distribution-block mounting; no special adapter plate needed for a DIN-rail enclosure if the rail is sized for the 76.2 mm width. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The breaker is rated for the full industrial ambient span — no cold-start derating required down to -25 °C.