Siemens 3VA1050-3ED36-0JA0 — 50 A SENTRON MCCB with Shunt Trip
The Siemens 3VA1050-3ED36-0JA0 is a SENTRON molded case circuit breaker (MCCB) rated 50 A at 40 °C, with three poles and a TM210 thermal-magnetic overcurrent release. It carries a 75.6 kA interrupting capacity at 240 V and 52.5 kA at 415 V, with a rated insulation voltage of 800 V. The unit includes a shunt trip (STL) auxiliary release and is designed for line protection in distribution panels.
Breaking Capacity and Thermal Ratings
The 75.6 kA at 240 V and 52.5 kA at 415 V mean this MCCB can safely interrupt high fault currents on 240 V and 415 V three-phase systems — typical for industrial panel feeders and large motor branch circuits. At 690 V the rating drops to 7.5 kA, so verify the available fault current at the point of installation. The thermal derating curve is flat from 40 °C to 50 °C (50 A), then steps down to 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. If the panel ambient runs above 50 °C, the continuous load must be reduced accordingly.
Physical Integration and Panel Fit
The MCCB measures 76.2 mm wide, 130 mm high, and 70 mm deep. It mounts on a DIN rail or directly to a backplate via the SENTRON mounting base. The 3-pole footprint is standard for 50 A frames; verify gland-plate clearance for the 70 mm depth, especially in shallow enclosures. The shunt trip occupies the auxiliary slot and requires a separate control voltage — confirm polarity and suppression per the wiring diagram.
Power Loss and Operating Range
Maximum power loss is 14.6 W at rated current — relevant for thermal budgeting inside sealed enclosures. Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. The supplied basic switch is order code 3VA10503ED360AA0, which is the internal switching mechanism.