Siemens 3VA1080-3ED42-0AA0 — 80 A SENTRON MCCB for Line Protection
The Siemens 3VA1080-3ED42-0AA0 is a SENTRON molded case circuit breaker (MCCB) designed for line protection in distribution panels. It carries 80 A continuously at 40 °C ambient, derating to 74 A at 70 °C, so the thermal curve is predictable across a warm enclosure — no surprise trip on a summer afternoon. The 4-pole configuration suits three-phase-plus-neutral or dual-feed applications where full isolation is required.
Breaking Capacity and Selectivity Headroom
Interrupting ratings climb to 75.6 kA at 240 V and hold 52.5 kA at 415 V, which gives solid selectivity headroom downstream of a larger main breaker or transformer secondary. At 440 V it still clears 32 kA, and at 500 V or 690 V it holds 7.5 kA — enough for most industrial motor-control centres on a 480Y/277 V service. The TM210 overcurrent release combines a thermal-magnetic trip with fixed time-current characteristics; no electronic adjustments, so the curve is repeatable across units in a multi-source BOM.
Physical Fit and Panel Integration
Footprint is 101.6 mm wide by 130 mm tall by 70 mm deep — a standard 4-pole MCCB envelope that drops into most SENTRON or third-party distribution blocks without re-drilling the gland plate. IP40 on the front means it is protected against tools and wires larger than 1 mm, which is typical for enclosed panel mounting; no special sealing required inside a NEMA 1 or IP54 cabinet. Rated insulation voltage is 800 V, so it can be wired into 690 V systems without de-rating the dielectric clearance.
Power Loss and Thermal Management
Maximum power loss is 19.2 W at rated current — negligible for most enclosure thermal budgets, but worth noting if the breaker sits in a densely packed sub-panel with multiple devices running near their limits. The operating temperature range spans -25 °C to 70 °C, with storage from -40 °C to 80 °C, so it handles cold warehouses and hot machine cabinets alike.