Monitoring devices perform a wide range of functions for protecting people and machines:Residual current monitors (RCMs) enable the detection of system malfunctions and facilatate troubleshooting before the protective device is switched off, which increases plant and operating safety, and cuts costs.

Current relays monitor, for example, emergency lighting installations and motor loads. Insulation monitors are used for the protection of persons against ungrounded systems – IT systems. Another function includes the monitoring of medicinal premises with automatic voltage switchover.