Siemens 3VA1150-4EF32-0CC0 — 50 A MCCB for Line Protection
It carries a continuous current rating of 50 A at 40 °C and holds that rating through 50 °C, derating to 49 A at 55 °C and 45 A at 70 °C — useful to know when the breaker sits in a warm enclosure alongside other heat sources. Breaking capacity is the headline: 121 kA at 240 V AC, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at both 500 V and 690 V.
Built-in Undervoltage Release and Auxiliary Switches
That means the breaker trips automatically when supply voltage drops below a threshold, protecting downstream equipment from brownout conditions or preventing automatic restart after a power loss. The auxiliary switch complement is two HQ-style auxiliary switches, providing status feedback for the open/closed position without needing an add-on module. The breaker does not include a ground-fault monitoring version, a communication function, a trip indicator, or a voltage trigger. It is a straightforward line-protection MCCB with the UVR as the main accessory — no extra frills, which keeps the BOM clean for standard distribution duty.
Suitable for unconditioned electrical rooms or outdoor-rated enclosures within those limits.