The Siemens 3VA9214-0RS20 is a side-mounted residual current protection module — Type A, 4-pole, rated 250 A — designed as an accessory for the 3VA1 molded-case circuit breaker family with terminal connection. It belongs to the SENTRON RCD510 Basic line, meaning it covers the core ground-fault protection function without communication or remote-trip features. Type A detection handles AC sinusoidal and pulsed DC residual currents, which covers most industrial and commercial loads with rectifiers or switching power supplies upstream of the protected circuit.
What the adjustable settings mean on the line
The residual current trip threshold is selectable across seven fixed values: 0.03, 0.05, 0.1, 0.3, 0.5, 1, 3, and 5 A. That range lets you dial in sensitivity from personnel protection (30 mA) up to fire-prevention or equipment-protection levels (5 A) without swapping hardware. The non-tripping time delay is also adjustable: 0, 0.06, 0.15, 0.3, 0.5, 1.0, 2.0, or 3.0 seconds. Setting a delay avoids nuisance tripping on inrush or transient ground-leakage spikes — common on motor feeders or UPS-backed circuits. A pre-alarm indication triggers at 30 % of the set residual current value, giving the maintenance team a heads-up before the RCD trips. The module also supports selectable RCD or monitoring-only mode, so you can log leakage trends without disconnecting the load.
Mounts via screw fixing to the side of a 3VA1 breaker — it is not a standalone DIN-rail device. The infeed can enter from the top or bottom of the RCD component, which simplifies bus-bar routing inside the panel. Physical footprint: 170 mm wide, 228 mm high, 70 mm deep. The module is sealable (provision for a lead seal), which matters for utility or metering applications where tamper evidence is required.
Because it is an accessory tied to the 3VA1 breaker platform, availability follows that platform's production cadence. The 3VA1 series is Siemens' current-generation MCCB family, so the RCD module should remain available for the foreseeable future.