Voltage monitoring relay with terminal block NZM1-XU208-240AC 259442

Undervoltage release for NZM and N circuit breakers – reliable disconnection in case of voltage drop

This undervoltage release, catalog number 259442, is a key element ensuring the safety and reliability of electrical installations. Designed to work with NZM and N series circuit breakers, it reacts to a drop in control voltage, automatically disconnecting the circuit. This is an ideal solution for systems requiring emergency shutdown in case of power supply problems.

This release is particularly useful in applications where protecting against the effects of sudden voltage drops is a priority, e.g., in devices requiring continuous power or where safe process shutdown is necessary. Installation is simple and flexible thanks to the screw connection.

Functionality and application

The NZM1-XU208-240AC undervoltage release is designed to work with NZM1(-4) and N(S)1(-4) circuit breakers. Its main task is to disconnect the power circuit breaker when the control voltage drops below 35-70% of the nominal value (Us). This ensures reliable operation of emergency shutdown systems, especially in conjunction with EMERGENCY STOP buttons.

An additional benefit is that when the release is not energized, it prevents accidental switching on of the circuit breaker, providing protection against contact with the main switch contacts during maintenance or service work. It should not be mounted simultaneously with the leading auxiliary switch NZM..-XHIV.. or the operating current release NZM..-XA....

Compatibility and characteristics

This release is characterized by a wide range of AC control voltage – from 208 to 240 V for frequencies of 50 Hz and 60 Hz. This is a universal solution compatible with both single-phase and three-phase networks. The possibility of using it as an accessory for the popular LZM/LN and NZM/N series makes it an economical choice for installers and end users. This means that one type of release can be used in various electrical installation configurations.