ABB RD3M - User Manual

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2CSF423006D1002
RD3M
RD3M-48
Relè differenziale
elettronico
Electronic residual
current relay
Relais differentiel
électronique
Relé diferencial
electrónico
Elektronisches
Differentialschutzrelais
ABB_76x88mm_RD3M_rev4.indd 1 19/09/11 11:02

Summary

RD3 M Electronic Residual Current Relay

Description

Installation

Toroid-Relay Connection

Details the connection procedure between the toroid and the RD3M relay for proper installation.

Functions

Pre-alarm Function

Explains how to activate the pre-alarm function via a dip-switch and its output contact behavior.

Fail-safe Function

Describes the fail-safe feature where output contacts switch when no current is input to the RD3 device.

Signal Indications

Stand-by Signals

Illustrates the indicator lights and output contact status during the device's stand-by mode.

Fault Signal

Details the visual and output contact signal indications when a fault condition occurs.

No TR Connection Signals

Explains the signal behavior when the toroidal transformer (TR) is not connected to the device.

Fault Status and Operation

Shunt Trip Connection

Explains how the RD3 relay triggers a shunt trip to open the circuit breaker when residual current exceeds the threshold.

Undervoltage Release Connection

Describes the connection of the RD3 relay to an undervoltage release for fault tripping.

Test Procedures

Technical Specifications

Overall Dimensions

ABB RD3M Specifications

General

Number of outputs	1
Mounting	DIN rail
Width	22.5 mm
Protection rating	IP20
Rated Control Supply Voltage (Uc)	24-240V AC/DC
Supply voltage	24-240V AC/DC
Output	1 changeover (CO)
Terminal Type	Screw Terminals
Catalog Description	RD3M timing relay, 1 CO, 8A, multi-function, 24-240V AC/DC
Type	RD3M