What this MCCB delivers in a panel
The Siemens 3VA1180-4EF32-0AC0 is a 3-pole SENTRON molded case circuit breaker rated 80 A continuous at 40 °C, with a TM240 thermal-magnetic release for line protection. Its interrupting capacity reaches 121 kA at 240 VAC — enough to handle high-fault utility feeds without cascading upstream breakers. At 415 VAC the breaker still clears 75.6 kA, and at 690 VAC it holds 11.9 kA, so the same frame covers 480Y/277 V and 600 V class panels with solid selectivity headroom. The insulation voltage is rated 800 V, meaning the internal clearances support 690 V line-to-line without derating the dielectric gap. Dimensions are 130 mm high, 76.2 mm wide, 70 mm deep — a compact 3-pole MCCB that fits standard Siemens switchboard mounting patterns and leaves room for auxiliary switch blocks (the design includes 2 auxiliary switches HQ).
Thermal-magnetic release and temperature derating
The TM240 release is a fixed thermal-magnetic trip unit rated for 80 A at 40 °C ambient. Unlike an electronic trip, the TM240 uses a bimetal thermal element for overload protection and a solenoid for short-circuit — no auxiliary power needed, no field-adjustable curves. Derating is minimal through 50 °C (still 80 A), then drops to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. If the panel ambient runs above 50 °C, the continuous current must be reduced accordingly.
Panel integration and mounting
Mounts on a standard DIN rail or direct to the backplate via screw terminals. The 70 mm depth fits within typical 200 mm deep enclosures, leaving room for rear-connected busbars. Spring-cage or box lug terminals accept copper or aluminum conductors; torque values follow the terminal marking on the breaker face. No undervoltage release or shunt trip is fitted on this variant — those are separate accessories added via the side-mounted mechanism slots.