The Siemens 3VA1050-4ED32-0DH0 is a SENTRON molded case circuit breaker (MCCB) rated for 50 A continuous at 40 °C, with a 3-pole configuration and a TM210 thermal-magnetic release for line protection. It carries a 121 kA interrupting rating at 240 V and 75.6 kA at 415 V, so it handles high-fault-current service-entrance or distribution panels without cascading upstream — that's the spec that decides whether it clears a bolted fault or the main breaker trips instead.
Ratings and what they mean for the panel
Rated continuous current Iu is 50 A, and it holds that rating from 40 °C up to 50 °C without derating — only drops to 48 A at 55 °C and 45 A at 70 °C. That means in a warm enclosure you still get nearly full ampacity; no need to oversize for a 50 °C ambient. The interrupting ratings step down with voltage: 121 kA at 240 V, 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. At 415 V it's still well above typical utility fault levels, so it's a clean fit for most European 400 V distribution. Rated insulation voltage Ui is 800 V, so it's rated for 690 V line-to-line systems with margin. The TM210 release is thermal-magnetic — fixed thermal element for overload, magnetic for short-circuit — no electronic adjustment, which keeps it simple and reliable for standard line protection. No communication function, no phase-failure detection, no ground-fault monitoring: this is a basic, rugged MCCB for straightforward feeder or branch protection.
Built-in auxiliaries and release
Comes with 2 auxiliary switches plus 1 trip alarm switch (HQ version) factory-fitted — that's enough for remote status and a separate alarm signal without adding external relays. The undervoltage release (UVR) is also integrated, so the breaker trips on loss of control voltage, which is standard for safety circuits or emergency-stop chains. The auxiliary trip module order code is 3VA9608-0BB25 if you ever need a replacement.
Physical fit and environment
Dimensions: 130 mm high, 76.2 mm wide, 70 mm deep — that's a standard 3-pole MCCB footprint for a 50 A frame. Mounts on a DIN rail or panel-mount base. Front protection is IP40, so it's fine inside a closed panel but not for washdown areas. Operating temperature range is -25 °C to 70 °C; storage from -40 °C to 80 °C. Latching endurance is rated at 15,000 operations — typical for this class, not a high-cycle motor-starting breaker.