Siemens 3VA5120-6ED31-0AA0 Three-Phase Circuit Breaker

Siemens 3VA5120-6ED31-0AA0 is a three‑pole molded‑case circuit breaker in the SENTRON 3VA5 family, designed to protect three‑phase loads with a 20 A rated current. It uses a TM210 thermal‑magnetic trip unit to provide long‑time and instantaneous protection (In = 20 A, Ir = 20 A, Ii = 15 × In), enabling reliable fault clearance while minimizing nuisance trips. Built on a UL Frame 125 platform, this device offers a breaking capacity of 65 kA at 480 V, suitable for demanding industrial feeders and panelboard protection. It is rated for an insulation voltage Ui of 800 V and a rated operating voltage Ue up to 690 V AC, making it compatible with broad European and North American distribution systems. For durability, the manufacturer specifies a mechanical service life of about 15,000 switching cycles and an electrical endurance of around 4,000 cycles at 600 V. The 3‑pole configuration ensures simultaneous disconnection of all phases, making it well suited for protecting motors, machines, and three‑phase distribution circuits in commercial and industrial environments.