Undervoltage release (loss-of-voltage) 440-480 V AC 421025

Undervoltage Trip for Installation Protection

This undervoltage trip, designed to work with DPX3 series compact circuit breakers, provides effective protection against voltage loss. Its purpose is to disconnect the circuit in the event of voltage dropping below the set threshold, safeguarding connected devices from damage and malfunction. This is especially critical in applications sensitive to voltage fluctuations, such as control systems, industrial automation, and sensitive electrical loads.

Functionality and Applications

The trip responds to voltage drops in the range of 440–480 V AC (product code: 440-480), making it an ideal solution for installations with this rated voltage. It can be used with contactors, circuit breakers, motor starters, and thermal overload relays. Thanks to its screw-type connection, installation and wiring are simple and convenient. The absence of switching, make, or break contacts means the device performs solely as a voltage monitor that initiates disconnection upon voltage drop.

Specifications and Installation

The device is designed for use with DPX3 circuit breakers, ensuring compatibility and reliable operation. Its screw-terminal construction guarantees secure and durable electrical connections. Note that the trip has no time-delay function—it responds immediately upon detecting a voltage drop below the activation threshold. This rapid response minimizes the risk of damage to connected equipment.