MCCB for line protection — 80 A, 3-pole, with undervoltage release
The Siemens SENTRON 3VA1080-3ED36-0CC0 is a 3-pole molded case circuit breaker (MCCB) rated for line protection, with a continuous current Iu of 80 A and a TM210 thermal-magnetic overcurrent release. It carries an undervoltage release (UVR) and two HQ auxiliary switches, making it suitable for applications where loss-of-voltage tripping and remote status feedback are required — common in safety interlock or emergency-stop circuits that must remain traceable under change control.
Breaking capacity and thermal derating — what the ratings mean for the panel
Breaking capacity is 75.6 kA at 240 V AC, 52.5 kA at 415 V AC, 32 kA at 440 V AC, and 7.5 kA at 690 V AC. At 415 V — the common European distribution voltage — 52.5 kA provides headroom for most industrial main feeders; selectivity with downstream breakers should be verified per the coordination tables in the 3VA manual. The rated continuous current holds at 80 A from 40 °C up to 50 °C, then derates linearly to 72 A at 70 °C. If the MCCB is installed in a high-ambient enclosure (e.g., near a drive or transformer), the 70 °C figure of 72 A governs the load current — do not size to the 80 A nominal without accounting for enclosure temperature rise.
Mounting and integration — panel fit and auxiliary wiring
The MCCB measures 130 mm high, 76.2 mm wide, and 70 mm deep — a 3-pole footprint that fits standard SENTRON panel cutouts. The front face carries IP40 protection, suitable for enclosed distribution boards. The two HQ auxiliary switches (rated for 2 A at 24 V DC, typical for PLC inputs) and the undervoltage release are factory-integrated; verify the UVR coil voltage matches the control supply before wiring. The integrated auxiliary trip is listed as order code 3VA9608-0BB24, which should be documented in the BOM for spare-part traceability.