Legrand 406280 Undervoltage Release 24-48V AC/DC for TX3, DX3, and FRX Series

The Legrand 406280 Undervoltage Release is a specialized auxiliary component engineered to enhance the safety and functionality of electrical distribution systems. Designed for seamless integration with TX3, DX3, and FRX series circuit breakers, this device monitors supply voltage levels and automatically triggers a trip when the voltage drops below a defined threshold. It serves as a critical safety mechanism, ensuring that connected equipment is protected during power instability or mains voltage drops.

Advantages

This undervoltage release offers a robust solution for remote tripping, providing reliable performance in various electrical configurations. Its design allows for easy installation on the left-hand side of compatible devices without the need for specialized tools, simplifying the assembly process. The unit is compact, occupying only one module of space, and supports the insertion of supply busbars, which helps maintain a clean and organized electrical panel layout. By enabling remote tripping via a normally closed push button or automatic voltage monitoring, it significantly improves the control and safety of your electrical infrastructure.

Suitable for

• Monitoring mains voltage drops in electrical distribution systems
• Remote tripping of MCBs, RCBOs, RCCBs, and remote trip isolating switches
• Integration with TX3, DX3, and FRX series circuit breakers
• Applications requiring safety-critical power disconnection during low voltage events

When it may not be suitable

This device is not intended for use with circuit breakers outside of the specified TX3, DX3, and FRX series. It is also not suitable for applications requiring voltage monitoring outside the 24-48V AC/DC range, as attempting to use it with incompatible voltage levels may result in failure to trigger or damage to the component.

Key specifications

• Operating voltage: 24-48V AC/DC
• Compatibility: TX3, DX3, and FRX series devices
• Installation position: Left-hand side
• Module width: 1 module
• Mounting: Tool-free attachment to the main device

How to use

The Legrand 406280 is designed for straightforward installation. It attaches directly to the left-hand side of your compatible circuit breaker or isolating switch without requiring any tools. Once physically joined, the device is ready to monitor the supply voltage. For remote tripping functionality, you can wire a normally closed push button to the unit. Ensure that the system voltage is within the 24-48V AC/DC range before energizing the circuit to prevent operational errors.

What to consider before purchase

• Verify that your existing circuit breaker belongs to the TX3, DX3, or FRX series.
• Ensure your control circuit provides a stable 24-48V AC/DC supply.
• Confirm that you have sufficient space on the left side of your current device for the 1-module wide auxiliary.
• Check if you already have a remote tripping auxiliary installed, as each device supports a maximum of one.

Usage recommendations

Always ensure the main power supply is disconnected before installing or modifying any electrical components. Consult a qualified electrician if you are unsure about the compatibility or wiring requirements of your specific electrical distribution system.