The Siemens 3VA9113-0RS20 is a SENTRON RCD510 residual current device (RCD) — a Type A side-mounted module designed as an accessory for 3VA1 molded-case circuit breakers with terminal connection. It provides adjustable earth-leakage protection for three-phase circuits up to 160 A at 50/60 Hz, with a rated voltage range of 127–480 V.
The adjustable residual current range spans 0.03 A to 5 A across seven selectable set points (0.03; 0.05; 0.1; 0.3; 0.5; 1; 3; 5 A) — covering everything from sensitive 30 mA personal protection to 5 A for equipment ground-fault backup. The non-tripping time delay is independently adjustable from 0 to 3000 ms in 0.06, 0.15, 0.3, 0.5, 1.0, 2.0, and 3.0 s steps, letting you coordinate selectivity downstream without nuisance trips on transient leakage. Rated operational current is 160 A at AC, which matches the frame size of the host 3VA1 breaker — the RCD does not reduce the circuit's continuous current rating. The module also includes a pre-alarm indication at 30% of the set residual current value, giving early warning before a trip event. Screw fixing secures the module to the breaker side; infeed can be from top or bottom.