With the narrow PSR-MM25 zero-speed safety relays, machine downtime is monitored without the need for additional sensors, and an interlocking device, for example, is actuated. To detect downtime, a voltage induced in a motor winding is evaluated.
With PSR-MM30 zero-speed and over-speed safety relay, you can monitor up to three different operating modes in addition to zero-speed mode. PSR-MM30 ensures high system availability, due to reliable measuring procedure.