The Siemens SENTRON 3VA1050-4ED42-0HH0 is a 4-pole molded case circuit breaker (MCCB) rated for line protection, carrying 50 A continuous at 40 °C with no derating needed up to 50 °C — at 55 °C it still holds 49 A, and at 70 °C it's still good for 45 A. That thermal curve means you can run it near its nameplate in a warm panel without dropping frame size. Breaking capacity is the headline: 121 kA at 240 VAC, 75.6 kA at 415 VAC, 52.5 kA at 440 VAC, and still 11.9 kA at 690 VAC. That's a high-interrupting rating for a 50 A frame — it clears serious fault current without cascading upstream, which matters when you're coordinating downstream feeders in a distribution panel. Rated insulation voltage is 800 V, so it's comfortable on 480 V and 600 V class systems with headroom. The 14.6 W maximum power loss is moderate for a 4-pole 50 A MCCB — factor it into your enclosure thermal budget if you're packing several breakers in a small cabinet.
Fit and integration
Dimensions are 101.6 mm wide, 130 mm high, 70 mm deep — a standard SENTRON 3VA frame footprint. It mounts on a DIN rail or panel-mount plate in a distribution board. The 4-pole width is the same as a 3-pole plus one module; check your enclosure fill factor if you're replacing a 3-pole unit. Comes with 2 auxiliary switches plus a trip alarm switch (HQ) factory-installed, and a shunt trip release (STL) for remote tripping. No undervoltage release, no ground-fault monitoring, no communication module — this is a straightforward line-protection breaker with basic remote-trip capability. Trip indicator and voltage trigger are present — you get visual trip indication and the ability to wire a remote trip signal through the shunt release. The supplied basic switch is order code 3VA10504ED420AA0.
Lifecycle and sourcing
Operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. That covers most indoor electrical rooms and mild outdoor enclosures. The -25 °C minimum means it's fine for unheated shelters in temperate climates.