What this MCCB is and what it carries
The Siemens 3VA1180-5EF32-0KA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It's a 3-pole unit rated 80 A continuous at 40 °C, with a TM240 thermal-magnetic overcurrent release and an integrated shunt trip (STL) auxiliary release for remote tripping. The interrupting capacity scales with system voltage: 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 high-interrupting frame — suitable for fault currents near the transformer secondary where SCCR headroom matters. Rated insulation voltage is 800 V, and maximum power loss is 19.2 W. The shunt trip (STL) lets a safety PLC or E-stop circuit drop the breaker remotely without a handle — common in emergency-off chains or undervoltage-coordination schemes.
Mounting and panel fit
Dimensions are 130 mm height, 76.2 mm width, and 70 mm depth — a standard 3-pole MCCB footprint that fits Siemens SENTRON distribution blocks and DIN-rail adapters. The 70 mm depth clears most 200 mm deep enclosures with room for rear-connected busbars or cable ducts. No communication function, no ground-fault monitoring, no undervoltage release on this variant. The trip indicator is also absent — so fault indication relies on the shunt trip's auxiliary contact or a separate signal contact added to the breaker.
Thermal derating and operating range
The 80 A rating holds from 40 °C through 50 °C. Above that it derates: 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. The operating ambient range is -25 °C to +70 °C, with storage from -40 °C to +80 °C.