Siemens 3VA1080-3ED42-0DH0 — 80 A SENTRON MCCB with Undervoltage Release
The Siemens 3VA1080-3ED42-0DH0 is a SENTRON molded case circuit breaker (MCCB) rated 80 A at 40 °C, 4-pole, designed for line protection in distribution panels. Its interrupting capacity hits 75.6 kA at 240 V, 52.5 kA at 415 V, and 32 kA at 440 V, with a 7.5 kA floor at 500 V and 690 V — so it handles high-fault utility feeds or transformer secondaries where the available short-circuit current is substantial. The 800 V rated insulation voltage gives headroom for 480/600 V class systems. Power loss maxes at 21.7 W, manageable in a standard enclosure without forced cooling.
What the ratings mean for panel fit
The 80 A rating holds steady 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 (–). That flat thermal curve means you don't lose headroom until the ambient inside the enclosure passes 50 °C — useful for a crowded panel or a sunny roof location. The 4-pole configuration handles three-phase plus neutral switching, common in North American and European distribution where the neutral must be disconnected for isolation. A trip indicator is present, so a quick visual scan tells you which breaker opened without pulling the cover.
Integrated undervoltage release and auxiliary switch complement
This variant ships with an undervoltage release (UVR) factory-installed — the breaker trips when supply voltage drops below a threshold, protecting motors or process loads from a brownout restart. The auxiliary switch complement is 2 auxiliary switches plus 1 trip alarm switch HQ, giving you three dry contacts for remote status: one for breaker open/closed, one for the UVR state, and one dedicated to trip events. No communication module and no ground-fault monitoring — this is a pure line-protection MCCB with local signaling only.
Dimensions and panel integration
The MCCB measures 70 mm deep, 101.6 mm wide, and 130 mm tall (–). That 101.6 mm (4 in) width is a standard MCCB footprint for 4-pole breakers in this class — it fits the usual DIN-rail or panel-mount cutout without surprises. The 70 mm depth (2.76 in) leaves room for rear busbar connections in a typical distribution cabinet.