The Siemens SENTRON 3VA1150-3EF36-0AD0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, carrying 50 A continuously at 40 °C ambient with no derating needed up to 50 °C — at 55 °C it still holds 49 A, so it stays solid in a warm panel. Its TM240 thermal-magnetic release means the thermal element is sized for a 240 A frame, but the breaker is factory-set to 50 A — you get the higher interrupting capacity of the larger frame without oversizing the branch protection.
Breaking capacity and coordination
At 240 V it interrupts 75.6 kA, at 415 V it handles 52.5 kA, at 440 V it's rated for 32 kA, and at 500 V / 690 V it still manages 11.9 kA — so it works across common industrial voltages without needing a current-limiting upstream breaker for most fault levels. The 800 V rated insulation voltage (Ui) gives headroom for 690 V systems, and the 14.6 W maximum power loss means the breaker doesn't cook adjacent components in a tightly packed panel.
Physical fit and integration
At 130 mm high, 76.2 mm wide, and 70 mm deep, this MCCB fits standard DIN-rail or screw-mount panel layouts — the 3-pole width is three modules wide on a 25 mm grid, so it replaces an existing 3-pole MCCB without re-drilling the backplate. It accepts up to three auxiliary switches (HQ type) for remote status feedback, and there's no undervoltage release or ground-fault module on this variant — those are add-on options if needed later.