Siemens 3VA1050-4ED32-0DA0 — 50 A SENTRON MCCB with TM210 Release
The Siemens 3VA1050-4ED32-0DA0 is a 3-pole SENTRON molded case circuit breaker rated for 50 A continuous current at 40 °C, with a TM210 thermal-magnetic overcurrent release. It carries a 121 kA interrupting rating at 240 V and 75.6 kA at 415 V, so it handles high-fault utility feeds and transformer secondaries where the available fault current is substantial. The TM210 release means the thermal element is fixed at 50 A (1× Iu) and the magnetic pickup is at 10× Iu — standard for line protection on motor branch circuits or distribution feeders where you want short-circuit protection without nuisance tripping on inrush.
Interrupting Capacity and Selectivity Planning
This MCCB's interrupting capacity drops from 121 kA at 240 V to 75.6 kA at 415 V, then 52.5 kA at 440 V, and 11.9 kA at 690 V. For a 480 V panel (common in North American industrial), the 52.5 kA at 440 V is the closest published figure — expect a similar value at 480 V, likely above 40 kA. That puts it in the high-fault range for a 50 A frame, suitable as a main or feeder breaker downstream of a transformer. The 800 V rated insulation voltage (Ui) confirms it is rated for 690 V systems, though the interrupting capacity at that voltage is 11.9 kA — adequate for most European 690 V distribution but not for high-fault locations.
Thermal Derating and Ambient Considerations
The 3VA1050-4ED32-0DA0 holds its full 50 A rating up to 50 °C ambient. Above that, it derates: 48 A at 55 °C, 47 A at 60 °C, 46 A at 65 °C, and 45 A at 70 °C. If this breaker sits in a non-air-conditioned enclosure near a heat source (like a drive cabinet or transformer vault), factor that derating into your load calculation. The operating range is -25 °C to 70 °C, with storage from -40 °C to 80 °C — fine for most indoor industrial environments. The IP40 front protection means it is dust-protected but not sealed; mount it inside a panel, not in a washdown area.
Panel Fit and Physical Integration
The 3VA1050-4ED32-0DA0 measures 130 mm high, 76.2 mm wide, and 70 mm deep. The 76.2 mm width (3 inches) is the standard 3-pole MCCB footprint for this frame size — it fits Siemens' own panelboard mounting and most DIN-rail adapter kits. No auxiliary contacts are included (without auxiliary contact version), so if you need status feedback to a PLC or alarm annunciator, order the auxiliary switch module separately. The undervoltage release (UVR) is built in — it trips the breaker when control voltage drops, which is common for emergency-stop circuits or undervoltage protection schemes.