Legrand DPX-I 250 ER Free-Release Switch 4P 160A Instruction Manual

1. Product Overview

The Legrand DPX-I 250 ER (Model 025297) is a 4-pole, 160A free-release switch designed for low-voltage electrical circuits. It ensures on-load breaking and disconnection, providing essential protection and control. This device is compliant with the NF IEC 60947-3 standard and falls under the AC-23 A utilization category. It is designed to integrate seamlessly with corresponding DPX differential blocks or differential relays.

Figure 1: Legrand DPX-I 250 ER Free-Release Switch, front view.

2. Safety Information

WARNING: Installation, maintenance, and repair of this electrical device must only be performed by qualified and authorized personnel. Failure to comply with safety instructions can result in serious injury, death, or equipment damage.

• Always disconnect power before working on the device or associated circuits.
• Use appropriate personal protective equipment (PPE).
• Ensure all local and national electrical codes and regulations are followed.
• Verify correct voltage and current ratings before installation.
• Do not operate the device if it appears damaged.

3. Product Features

• Type: Free-release switch (Interrupteur à déclenchement libre).
• Poles: 4P (4-pole).
• Rated Current (In): 160A.
• Function: Ensures on-load breaking and disconnection of low-voltage electrical circuits.
• Compatibility: Designed to associate with corresponding DPX differential blocks or differential relays.
• Mounting: Mounts on symmetrical rail up to DPX 250 ER.
• Standards: Compliant with NF IEC 60947-3.
• Utilization Category: AC-23 A.

4. Installation and Setup

The Legrand DPX-I 250 ER is designed for mounting on a symmetrical rail.

1. Preparation: Ensure the power supply to the installation area is completely disconnected and locked out.
2. Mounting: Mount the DPX-I 250 ER onto a symmetrical rail. For DPX-I 125, use mounting plates reference 268 08. For DPX-I 160 and DPX 250 ER, use mounting plates reference 268 09.
3. Connections: The connection points are identical to those of corresponding DPX units. Ensure all connections are secure and tightened to the manufacturer's specified torque settings. Refer to Figure 2 for terminal access.
4. Differential Block Coupling: If coupling a differential block, follow the instructions provided with the differential block. The device has a removable section to facilitate this coupling.
5. Verification: After installation, visually inspect all connections and ensure the device is securely mounted.

Figure 2: Top view of the Legrand DPX-I 250 ER, showing the four terminal connections.

5. Operation

The DPX-I 250 ER functions as a free-release switch, meaning its tripping mechanism is independent of the operating handle. This ensures that the switch will trip and open the circuit even if the handle is held in the "ON" position, providing reliable protection against overcurrents or short circuits.

• ON/OFF Operation: Use the operating handle to manually switch the circuit ON or OFF.
• Tripping: In the event of an electrical fault (e.g., overcurrent, short circuit), the internal mechanism will automatically trip the switch, moving the handle to the "TRIPPED" position (often midway between ON and OFF, or fully OFF depending on design).
• Resetting: After a trip, investigate and resolve the fault condition. To reset the switch, move the handle fully to the OFF position, then back to the ON position. If the switch immediately trips again, the fault persists.

6. Maintenance

Regular maintenance helps ensure the longevity and reliable operation of your Legrand DPX-I 250 ER switch.

• Periodic Inspection: Annually inspect the switch for any signs of physical damage, discoloration, or loose connections.
• Cleaning: Ensure the device is free from dust and debris. Use a dry, soft cloth for cleaning. Do not use liquid cleaners.
• Connection Checks: Periodically verify that all terminal connections remain tight.
• Functional Test: If possible and safe to do so, perform a functional test according to local regulations or system requirements.

All maintenance procedures should be carried out by qualified personnel with the power supply disconnected.

7. Troubleshooting

If the Legrand DPX-I 250 ER switch is not functioning as expected, consider the following:

• Switch Trips Immediately: This indicates an ongoing fault in the circuit (e.g., short circuit, overload). Do not attempt to repeatedly reset the switch without identifying and resolving the underlying issue.
• Switch Does Not Trip: If a fault is suspected but the switch does not trip, it may indicate a malfunction of the switch or an issue with the fault detection system. Immediately disconnect power to the affected circuit.
• Loose Connections: Check all terminal connections for tightness. Loose connections can cause overheating and intermittent operation.
• Physical Damage: Inspect the switch for any visible damage. A damaged switch should be replaced.

For complex issues or if you are unsure about troubleshooting steps, contact a qualified electrician or Legrand technical support.

8. Specifications

Figure 3: Product packaging label showing model number and key specifications.

9. Warranty and Support

Specific warranty information for the Legrand DPX-I 250 ER (Model 025297) is not available in the provided product data. For detailed warranty terms, technical support, or service inquiries, please contact Legrand directly through their official website or customer service channels.

You can typically find contact information on the official Legrand website: www.legrand.com