Monitoring Relays

The MachineAlert™ family of dedicated function motor protection relays offers supplementary protective functions that are easily added to your motor control circuits. These relays meet application requirements for supplemental voltage-, current-, thermistor-, power-, and power factor based protection. MachineAlert relays are an economical choice for protecting equipment investments and minimizing production downtime.

Bulletin 809S Current Monitoring Relay

809S Current Monitoring

Bulletin 809S Current Monitoring Relays offer state-of-the-art supplementary protective functions that are easily added and applied to your motor control circuits.


Bulletin 813S Voltage Monitoring Relay

813S Voltage Monitoring

Bulletin 813S Voltage Monitoring Relays offer state-of-the-art supplementary protective functions that you can easily add and apply to your motor control circuits.


Bulletin 814S Power Monitoring Relay

814S Power Monitoring

Bulletin 814S Power Factor Monitoring Relays and Power (kW) Monitoring Relays offer state-of-the-art supplementary protective functions that you can easily add and apply to your motor control circuits.


Bulletin 817S Thermistor Monitoring Relay

817S Thermistor Monitoring

Bulletin 817S Thermistor Monitoring Relays offer state-of-the-art supplementary motor protective functions that you can easily add and apply to your motor control circuits.