What it is and what it does
Siemens SENTRON 3VA1150-5GE46-0AA0 is a 4-pole molded case circuit breaker (MCCB) rated 50 A continuous with a TM220 thermal-magnetic release — fixed thermal, adjustable magnetic pickup up to 500 A. It's a line-protection device, not a motor-protection or ground-fault variant. The 4-pole construction (100% N-conductor protection) makes it a fit for three-phase-plus-neutral distribution panels where you need to break all four poles.
Breaking capacity — what the voltage tiers mean
This breaker delivers 187 kA at 240 V, 121 kA at 415 V, 75.6 kA at 440 V, and 17 kA at both 500 V and 690 V. That's a steep drop above 440 V — at 690 V the interrupting rating is only 9% of the 240 V figure. If your fault-current study shows available short-circuit above 17 kA at a 480/277 V or 600 V service, this breaker won't clear it. The 415 V rating (121 kA) is the sweet spot for most European industrial distribution.
Thermal derating — the real continuous current
Rated 50 A at 45 °C and 50 °C ambient. At 55 °C it's 49 A; at 60 °C it's 48 A; at 65 °C it's 46 A; at 70 °C it's 45 A. That's a 10% drop from 50 °C to 70 °C. If this breaker lives in a hot enclosure — say near a transformer or in a sun-baked panel — size the load at the derated figure, not the nameplate 50 A. The maximum operating temperature is 70 °C; storage range is -40 °C to 80 °C.
Footprint and panel fit
Measures 130 mm high, 101.6 mm wide, 70 mm deep. That's a 4-pole MCCB in a standard SENTRON 3VA frame — the width is the key dimension for DIN-rail or mounting-plate layout. Front IP40 protection; no communication module onboard. The design accepts an optional motor drive for remote tripping or re-closing.