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The Siemens 3VA5120-4EC31-0AA0 is a 3-pole molded-case circuit breaker from the SENTRON 3VA series. It is designed for system protection and features a TM230 overcurrent release with LI protection function.
Key electrical specifications include a maximum rated operational voltage of 690V AC and 500V DC. The current rating is 20A at 40°C, with derating at higher temperatures. It offers a breaking capacity of 55kA at 240V, 36kA at 415V, and 5kA at 690V according to IEC 60947 standards. Under UL 489, the breaking capacity is 25kA at 480V.
This circuit breaker has a mechanical service life of 15,000 switching cycles and an electrical endurance of up to 8,000 cycles at 380/415V. It is designed for DIN rail mounting and has dimensions of 140mm height, 76.2mm width, and 76.5mm depth. The maximum power loss is 12W.
The rated operational current is 20A at 40°C.
The maximum rated operational voltage is 690V AC at 50/60Hz and 500V DC.
The ultimate breaking capacity (Icu) at 415V AC is 36kA.
It provides LI (long-time and instantaneous) protection with an adjustable instantaneous response current from 150A to 300A.
The breaker mounts on a DIN rail and uses a lever actuator.
The typical mechanical service life is 15,000 switching cycles.