What it is and what it does
The Siemens SENTRON 3VA1050-3ED36-0JH0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection in distribution panels. It carries 50 A continuously at ambient temperatures up to 50 °C, derating to 45 A at 70 °C — so for a 50 A feeder in a warm cabinet, you stay within rating without upsizing the frame. The interrupting capacity hits 75.6 kA at 240 V and 52.5 kA at 415 V, which covers most low-voltage fault scenarios in industrial and commercial mains.
Breaking capacity across voltages — the so-what
The 75.6 kA at 240 V is the headline figure, but the real-world selector is the 52.5 kA at 415 V — that's the common 400 V-class industrial supply. At 440 V it still holds 32 kA, and at 500 V or 690 V it drops to 7.5 kA. If your fault current at the panel exceeds those numbers at the service voltage, you need a current-limiting upstream device or a higher-rated frame. The insulation voltage is rated 800 V, so the breaker itself is safe on 690 V systems even though its breaking capacity there is limited.
Panel fit and auxiliaries
The 3VA1050-3ED36-0JH0 measures 70 mm deep, 76.2 mm wide, and 130 mm tall — a standard 3-pole MCCB footprint that fits most DIN-rail or panel-mount enclosures without surprises. It ships with a shunt trip (STL) release and two auxiliary switches plus one trip alarm switch (HQ configuration), so you get remote trip indication and status feedback without ordering add-on modules separately. The power loss at rated current is 14.6 W — worth factoring into enclosure thermal calculations if the panel is densely packed.