80 A MCCB with TM240 release — line protection for distribution panels
The Siemens 3VA1180-3EF36-0AA0 is a SENTRON 3-pole molded case circuit breaker rated 80 A continuous current with a TM240 thermal-magnetic overcurrent release, designed for line protection in low-voltage distribution. The 80 A frame carries a 75.6 kA interrupting capacity at 240 V, derating to 52.5 kA at 415 V and 11.9 kA at 690 V — so the available fault current at the panelboard determines which voltage column governs the selection. The TM240 release provides fixed thermal and magnetic trip settings; there is no electronic adjustment or communication module on this variant.
Thermal derating and panel integration
The breaker holds its full 80 A rating from 40 °C through 50 °C ambient; above that it derates linearly to 74 A at 70 °C. In a sealed, uncooled enclosure that hits 55 °C, expect 78 A continuous capacity — factor that into the load schedule. The 70 mm depth and 76.2 mm width fit standard 3-pole MCCB mounting footprints on DIN rail or direct panel-mount, with 130 mm height clearing most distribution board gutters. Maximum power dissipation is 19.2 W at rated load, which matters for thermal rise calculations in multi-breaker panels.
Key ratings at a glance
Rated insulation voltage is 800 V, covering 480/600 V class systems with margin. Operating temperature range spans -25 °C to 70 °C; storage range extends from -40 °C to 80 °C. The breaker has no undervoltage release, no shunt trip, no ground-fault monitoring, and no communication function — it is a straight thermal-magnetic line-protection device. The 3-pole construction suits three-phase feeders, branch circuits, and panel main incomers.