SENTRON 3VA1080-4ED42-0BH0 — 80 A Molded Case Circuit Breaker
The Siemens SENTRON 3VA1080-4ED42-0BH0 is a 4-pole molded case circuit breaker rated at 80 A continuous current at 40 °C ambient, with a breaking capacity of 121 kA at 240 V AC. It's designed for line protection in industrial distribution panels and motor control centers, carrying the full SENTRON series selectivity and coordination characteristics.
Breaking Capacity and Current Ratings
Rated uninterrupted current holds at 80 A from 40 °C up to 50 °C, then derates gradually to 74 A at 70 °C — useful for high-ambient enclosures without oversizing the frame. Breaking capacity drops with system voltage: 75.6 kA at 415 V, 52.5 kA at 440 V, and 11.9 kA at 690 V. Rated insulation voltage is 800 V, so it's suited for 480/277 V and 600 V panels with headroom.
Built-In Auxiliary and Release Options
This variant ships with an undervoltage release (UVR) and a configuration of 2 auxiliary switches plus 1 trip alarm switch (HQ). The UVR trips the breaker when control voltage drops below a threshold — standard for safety circuits or emergency-off chains where loss of control power must open the main contacts. The auxiliary and alarm contacts report breaker status back to a PLC or annunciator panel.