50 A MCCB with 75.6 kA interrupting — what the ratings mean for fit
The Siemens 3VA1150-3EF36-0CC0 is a SENTRON molded case circuit breaker (MCCB) rated for line protection in distribution panels. Its 50 A continuous current at 40 °C holds steady through 55 °C (49 A) and derates to 45 A at 70 °C — so the thermal curve matters if your panel runs hot. The 75.6 kA interrupting capacity at 240 V drops to 52.5 kA at 415 V and 32 kA at 440 V, meaning this breaker handles high-fault commercial and light-industrial mains, not just subfeeds. At 690 V it still interrupts 11.9 kA. The 3-pole design suits three-phase loads; the built-in undervoltage release and 2 auxiliary switches HQ are already fitted — no add-on modules needed for status feedback or UV protection.
Panel fit — dimensions and wiring integration
The 3VA1150-3EF36-0CC0 measures 130 mm height, 76.2 mm width, and 70 mm depth — a standard MCCB footprint for DIN-rail or backplate mounting in a distribution board. The 70 mm depth leaves clearance for wiring ducts and gland plates in a typical 200 mm deep enclosure. The 3-pole block accepts copper or aluminum conductors sized for 50 A continuous; the undervoltage release and auxiliary switches are pre-integrated, saving panel space versus add-on kits.