ABB – RD3P‑48 – Residual Current Monitoring Relay, 12–48 V AC/DC

Main Features

• Manufacturer: ABB, part of the RD3 series of electronic residual current relays  

• Model/MPN: RD3P‑48 (also known as 2CSJ203001R0001)  

• Device Type: DIN‑rail mounted residual current (earth‑fault) monitoring relay with remote power test capability  

• Power Supply Range: 12 – 48 V AC/DC, suitable for systems lacking standard mains supply  

• Protection Function: Detects leakage current to earth—complies with IEC/EN 60947‑2 Annex M, suitable for MCCB integration (S200, Tmax up to T5)  

• Adjustable Settings:

  • Trip current (IΔn): Adjustable via front-panel knob

  • Response time (tΔ): Programmable delay to differentiate transient from actual faults  

• Indicators & Outputs:

  • LED status indicators (ON, FAULT, pre‑alarm option)

  • Two independent relay outputs: one signaling fault, one controlling load disconnection  

• Test & Reset Features:

  • Built-in test/reset button

  • Remote-reset input for external control  

• Construction & Mounting:

  • Compact 3-module width housing (≈0.223 kg)

  • Snap-on DIN‑rail mounting  

• Power Consumption: ~3.6 W per pole under normal operation  

Application Highlights

• Ideal for earth-leakage protection in control panels or distribution boards using low-voltage DC supplies.

• Can be integrated with ABB circuit breakers—enabling residential, commercial, or industrial systems without 230 VAC.

• Optional pre-alarm (early warning) and auto-reset features add flexibility in fault handling.