Legrand DX3 RCBO 411325-25A Instruction Manual

1. Introduction

This instruction manual provides essential information for the safe installation, operation, and maintenance of the Legrand DX3 RCBO (Residual Current Breaker with Overcurrent protection) model 411325-25A. Please read this manual thoroughly before installation and retain it for future reference.

The Legrand DX3 RCBO 411325-25A is designed to provide protection against both residual current faults (earth leakage) and overcurrents (overload and short-circuit) in electrical circuits. It is a dual-pole device with a current rating of 25 Amps and a sensitivity of 30 mA, suitable for 240/415V AC systems.

2. Safety Information

WARNING: Electrical shock hazard. Installation and maintenance must be performed by qualified personnel only.

Always disconnect power at the main supply before working on electrical circuits or the RCBO.
Ensure proper grounding according to local electrical codes.
Do not operate the device if it appears damaged.
Verify correct wiring connections before restoring power.
The RCBO must be installed in an enclosure that provides adequate protection against environmental factors.

3. Product Overview

The Legrand DX3 RCBO 411325-25A integrates the functions of a Miniature Circuit Breaker (MCB) and a Residual Current Device (RCD) into a single unit, offering comprehensive protection for electrical installations.

Legrand DX3 RCBO 411325-25A device showing front view with switches in 'On' position, specifications, and test button.

Figure 1: Front view of the Legrand DX3 RCBO 411325-25A. This image displays the Legrand DX3 RCBO 411325-25A. It features two main switches, both indicating 'I. On', and a test button labeled 'Test frequently'. Visible markings include 'DX3 C25 10000', '240V- 50Hz', and 'IΔn 30mA', along with a schematic diagram for connection.

Key Features:

Dual Pole (DP): Provides protection for both live and neutral conductors.
Current Rating: 25 Amps.
Sensitivity: 30 mA (milliAmperes) for earth leakage protection.
Breaking Capacity: 10 kA (kiloAmperes), indicating its ability to safely interrupt high fault currents.
Voltage Rating: 240/415V AC.
Type AC: Detects sinusoidal alternating residual currents.

4. Setup and Installation

Installation should only be carried out by a qualified electrician in accordance with national wiring regulations and standards.

4.1 Mounting

The Legrand DX3 RCBO is designed for DIN rail mounting. Ensure the DIN rail is securely fixed within an appropriate electrical enclosure.

Hook the top edge of the RCBO onto the DIN rail.
Press the bottom edge of the RCBO firmly until it clicks into place on the DIN rail.
Verify that the RCBO is securely mounted and does not wobble.

4.2 Wiring Connections

Refer to the wiring diagram provided on the device and ensure all connections are tight and secure. Use appropriate cable sizes for the 25A current rating.

Input Terminals (Top): Connect the incoming live and neutral conductors from the main supply.
Output Terminals (Bottom): Connect the outgoing live and neutral conductors to the circuit being protected.
Ensure correct polarity for live and neutral connections.
Tighten terminal screws to the recommended torque to prevent loose connections and overheating.

Note: The schematic diagram on the device (visible in Figure 1) illustrates the internal wiring and connection points.

5. Operating Instructions

5.1 Switching On/Off

To switch the RCBO ON, push the operating lever upwards to the 'I. On' position.
To switch the RCBO OFF, push the operating lever downwards to the 'O. Off' position.
In case of a fault (overcurrent or earth leakage), the RCBO will automatically trip to the 'O. Off' position.

5.2 Test Button

The RCBO is equipped with a test button to verify its residual current protection function. This test button is labeled "Test frequently" on the device.

With the RCBO in the 'I. On' position, press the 'T' (Test) button.
The RCBO should immediately trip to the 'O. Off' position.
If the RCBO does not trip, it indicates a malfunction, and the device must be replaced.
To restore power after a test, reset the RCBO by pushing the lever fully down to 'O. Off' and then back up to 'I. On'.

6. Maintenance

The Legrand DX3 RCBO requires minimal maintenance. Regular testing is the primary maintenance activity.

6.1 Regular Testing

It is recommended to test the RCBO using the test button at least once every three months to ensure its proper functioning. Follow the procedure described in Section 5.2.

6.2 Cleaning

If necessary, clean the exterior of the RCBO with a dry, soft cloth. Do not use abrasive cleaners or solvents. Ensure power is disconnected before cleaning.

7. Troubleshooting

Problem	Possible Cause	Solution
RCBO trips frequently.	Overload in the circuit. Short-circuit fault. Earth leakage fault. Faulty appliance connected.	Reduce load on the circuit. Inspect wiring for short-circuits. Check appliances for earth leakage. Disconnect appliances one by one to identify the faulty one. Consult a qualified electrician.
RCBO does not reset after tripping.	Persistent fault in the circuit. RCBO mechanism jammed.	Ensure all loads are disconnected and attempt to reset. If it still trips, a fault persists. If no fault is present and it still won't reset, the RCBO may be faulty and requires replacement.
Test button does not trip the RCBO.	RCBO is faulty.	Immediately replace the RCBO. It is not providing earth leakage protection.

8. Specifications

Parameter	Value
Model Number	411325-25A
Brand	Legrand
Type	RCBO (Residual Current Breaker with Overcurrent)
Number of Poles	Dual Pole (DP)
Current Rating	25 Amps
Sensitivity (IΔn)	30 mA
Breaking Capacity	10 kA
Voltage Rating	240/415V AC
Frequency	50 Hz
Curve Type	C-curve (indicated by C25 on device)
Mounting	DIN Rail
Country of Origin	India

9. Support and Warranty

For technical support or warranty inquiries regarding your Legrand DX3 RCBO 411325-25A, please contact your local Legrand distributor or visit the official Legrand website. Specific warranty terms and conditions may vary by region and purchase location.

Note: No specific warranty details or direct support contact information were provided with this product data.

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Legrand 411325-25A