80 A MCCB with 187 kA interrupting capacity
The Siemens SENTRON 3VA1180-5EF36-0AH0 is a 3-pole molded case circuit breaker rated for 80 A continuous at 40 °C, with a TM240 thermal-magnetic release. Its interrupting capacity reaches 187 kA at 240 V AC, dropping to 121 kA at 415 V and 75.6 kA at 440 V — numbers that matter when coordinating with upstream gear for arc-flash compliance. The 800 V rated insulation voltage (Ui) covers most 480/277 V and 600 V distribution panels with headroom. This is a line-protection design (not feeder or motor-protection), so it's sized for branch-circuit overcurrent protection in distribution panels. The TM240 release gives a fixed thermal curve with magnetic pickup at 240 A — 3× the 80 A frame rating — which suits general distribution loads rather than high-inrush motor starts.
Thermal derating and panel fit
The 80 A rating holds flat from 40 °C through 50 °C, then derates to 78 A at 55 °C, 77 A at 60 °C, 75 A at 65 °C, and 74 A at 70 °C. In a sealed enclosure with multiple breakers ganged, expect to apply that derating curve rather than the 40 °C nameplate. The 70 mm depth × 76.2 mm width × 130 mm height footprint fits standard Siemens 3VA panel-mounting patterns and accepts the same busbar kits as other 3VA1 frame sizes. Power loss at full load is 19.2 W — modest enough that adjacent breakers in a multi-pole group don't require forced ventilation in a typical 600 mm wide panel, but worth checking if the enclosure is undersized or densely packed.
Auxiliary contacts and trip indication
Factory-fitted with 2 auxiliary switches plus 1 trip alarm switch (HQ type). The trip alarm signals on overcurrent or short-circuit trip — useful for remote fault annunciation in a PLC or SCADA system. No undervoltage release or ground-fault module is included on this variant; those are separate add-on accessories if the spec requires them. The trip indicator flag on the front gives a visual at-a-glance confirmation that the breaker has tripped, not been manually switched off — saves a panel walk when troubleshooting.