What this MCCB carries and where it fits
The Siemens 3VA1150-3GE46-0AA0 is a SENTRON molded case circuit breaker (MCCB) rated for 50 A continuous, with a TM220 thermal-magnetic overcurrent release — that's a fixed thermal trip and a fixed magnetic short-circuit pickup, no adjustment knobs to dial in. Four poles, line protection design, no undervoltage release or ground-fault monitoring built in. The interrupting capacity at 240 V is 75.6 kA, which drops to 52.5 kA at 415 V and 32 kA at 440 V; at 690 V it still holds 11.9 kA. That's enough SCCR headroom for most 480 V distribution panels without needing a current-limiting fuse upstream. Dimensions are 130 mm high, 101.6 mm wide, 70 mm deep — that 70 mm depth is the key fit number when you're swapping into an existing panel can depth. The front face carries IP40 protection, so it's fine inside a closed enclosure but not for washdown areas. Ambient temperature derating starts at 55 °C: full 50 A up to 50 °C, then 49 A at 55 °C, 48 A at 60 °C, down to 45 A at 70 °C. Operating range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
What the TM220 release means for coordination
The TM220 designation tells you the thermal element is fixed at 50 A (the 220 indicates the frame size and release family), and the magnetic pickup is also fixed — no interchangeable trip units or dial-adjustable settings. That simplifies ordering but means you need to verify the short-circuit pickup level matches your downstream device coordination. For selectivity studies, the interrupting curve at each voltage level (75.6 kA at 240 V, 52.5 kA at 415 V, 32 kA at 440 V, 11.9 kA at 500 V and 690 V) is what you plug into the coordination study. The rated insulation voltage is 800 V, so it's suitable for 690 V systems with margin.