The Siemens 3VA1080-2ED42-0CA0 is a SENTRON molded case circuit breaker (MCCB) rated 80 A continuous at 40–50 °C, with a 4-pole configuration for three-phase plus neutral line protection. It carries an undervoltage release (UVR) as the auxiliary release, meaning the breaker trips on loss of control voltage — a common requirement for safety disconnects or emergency-stop chains.
Breaking capacity and selectivity
Rated breaking capacity reaches 52.5 kA at 240 V, 32 kA at 415 V, and 13.6 kA at 440 V, with a floor of 7.5 kA at 500 V and 690 V. These figures define where this breaker can be applied in a selective coordination study — it clears faults up to those levels without upstream devices needing to open, which is the core requirement for a distribution panel's fault-withstand rating.
Thermal derating and operating range
Continuous current holds at 80 A 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. The overcurrent release is the TM210 thermal-magnetic type, so the thermal element tracks ambient temperature — a panel running near 70 °C loses about 7.5 % of the nominal rating. Operating ambient range is -25 °C to 70 °C; storage range is -40 °C to 80 °C.
Physical fit and panel integration
Width is 101.6 mm (4 in), depth 70 mm (2.76 in), height 130 mm (5.12 in). The 4-pole body occupies a standard MCCB footprint on a DIN rail or panel-mount adapter. Insulation voltage rated 800 V, so it suits 690 V line-to-line systems with margin. Maximum power loss is 21.7 W — factor that into enclosure thermal calculations.