What you're looking at
The Siemens 3VA1080-2ED42-0CH0 is a SENTRON molded case circuit breaker (MCCB) rated for 80 A continuous current at 40 °C, with a 4-pole configuration for three-phase plus neutral protection. It's built for line protection — meaning it sits upstream protecting feeders and branch circuits, not motor overloads. The interrupting ratings tell the story: 52.5 kA at 240 V, 32 kA at 415 V, 13.6 kA at 440 V, and 7.5 kA at 690 V. That 32 kA at 415 V is the number most panel builders will check first for common industrial supply voltages. The TM210 overcurrent release is thermal-magnetic — fixed thermal pickup, magnetic trip set at 10x Iu. No electronic adjustment, no comms module. Simple, reliable, and what you want when the line-down call comes at 2 AM and the spare has to work first time.
Fit and panel integration
Physical size: 130 mm tall, 101.6 mm wide, 70 mm deep. That width — 101.6 mm — is a standard 4-pole MCCB footprint for this class. It'll drop into most SENTRON panel layouts without re-drilling the backplate. Front protection is IP40 — fine for a clean indoor panel, but not rated for washdown or outdoor exposure. The auxiliary contact complement is 2 auxiliary switches plus 1 trip alarm switch (HQ type), and an undervoltage release (UVR) is built in. If your safety circuit needs a UVR to drop the breaker on loss of control voltage, that's already covered. The integrated auxiliary trip order code is 3VA9608-0BB24 — if you're ordering spares, that's the trip unit to match.
Thermal performance and derating
This breaker holds 80 A continuous from 40 °C up to 50 °C. At 55 °C it derates to 76.8 A, at 60 °C to 75.2 A, at 65 °C to 73.6 A, and at 70 °C to 72 A. The operating temperature range is -25 °C to 70 °C; storage range is -40 °C to 80 °C. If your panel ambient runs hot, the 80 A rating is good until you cross 50 °C — after that, you need to account for the drop.