A voltage monitoring relay is a device used to monitor the voltage levels in electrical systems, particularly to ensure safe operation when the voltage drops below a certain threshold. This means the electrical supply is turned off or not energised. Even when the supply is off, there can be situations where voltage might still be present due to backfeeding or residual energy in the system.
The voltage monitoring relay is designed to detect the presence of such residual voltage. It monitors the voltage levels in the system and triggers an alarm or an action (such as opening a circuit breaker) if voltage is detected above a safe threshold. Safety solutions provider since 2011, We offer Pilz safety relays, safety sensors, emergency stop, two hand control, swicthes and more.
This indicates that the system can be single-phase (1 phase) or three-phase (3 phases). http://www.pilz.com In both cases, if there is a neutral conductor present, the voltage monitoring relay can monitor the voltage across all phases as well as between each phase and the neutral conductor.
The main purpose of using a voltage monitoring relay in this context is safety. It ensures that maintenance personnel or workers are not exposed to unexpected voltage when they assume a system is de-energised. By providing a reliable indication of voltage presence, it helps prevent electrical shocks and ensures safe working conditions.