What this MCCB is and what it carries
The Siemens 3VA1050-3ED32-0CA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It is a 3-pole unit rated 50 A at 40 °C, with a TM210 thermal-magnetic overcurrent release and an integrated undervoltage release (UVR). The rated insulation voltage is 800 V, and the maximum power loss is 17.1 W.
Breaking capacity and what it means for coordination
The interrupting rating is 75.6 kA at 240 V AC, 52.5 kA at 415 V, 32 kA at 440 V, and 7.5 kA at both 500 V and 690 V. For a 50 A frame, these figures give substantial headroom for high-fault installations — the 75.6 kA at 240 V covers most North American panelboard applications, while the 52.5 kA at 415 V suits European industrial distribution. The 7.5 kA at 690 V is the limiting value for 690 V line-side faults; verify selectivity with upstream devices at that voltage level.
Thermal derating and operating range
The breaker holds its 50 A rating from 40 °C through 50 °C. Above that, derating is linear: 49 A at 55 °C, 48 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. The operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. If the panel ambient runs above 50 °C, the continuous current capability drops — factor that into the load calculation.
Physical fit and panel integration
Dimensions are 130 mm height, 76.2 mm width, 70 mm depth. The 3-pole width (76.2 mm) is standard for this SENTRON frame size; it mounts on a DIN rail or direct-panel bolted. The undervoltage release adds a control-wire termination — verify the coil voltage matches the control circuit before wiring.