Product description
The power failure detector is a sensor for monitoring mains voltage. When 1 or more phases fail, the built-in relay switches.
This power failure detector has a universal alarm output with a voltage-free changeover contact. Optionally, you can have either an open or a closed contact, in the presence or absence of mains voltage at the input.
Reset occurs automatically on return of mains power.
Applications
Monitoring of technical installations
The power failure detector is housed in a 35 mm DIN rail enclosure and intended for fixed installations, such as in a control cabinet. Click for alternative: mobile phone power failure detector.
The alarm signal, in the form of a de-energised NO-NC contact, can be connected to a security system, control panel or other circuits for monitoring mains voltage.
Switching on auxiliary voltage
Special application: automatically control a relay to switch on another voltage as soon as the mains voltage is lost.
The red LED on the power failure detector illuminates when mains power is present. For power current, this means that all 3 phases are present.
Monitoring 1 or 3 phases
The power failure detector has 4 connections for monitoring 3-phase AC voltage (380/400 volts) with neutral connection. It can also be used for single-phase mains voltage (220/230 volts).
The output terminal has 3 connections, for NO-COM-NC. Both input and output are designed as plug-in terminals. See figure for connection.
What is power failure?
Power failure is the popular approximation for mains power failure. It can mean that mains power is no longer entering the building, or that a fault has occurred in the electrical system.
*Please note that a basic knowledge of electrical engineering is required (for installation) when purchasing some products on our webshop.
