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Motogard Control Relay

All Motogard systems fully conform to the NEC requirements for integral motor thermal protection. The temperature inside of the motor is monitored at all times. Using Positive Temperature Coefficient (PTC) Thermistors embedded in or in contact with the surface, the Motogard system is able to continually sense when the equipment exceeds the pre-selected temperature limits.

Motogard systems are recommended for applications requiring high reliability under conditions of heavy duty or severe ambient contamination. Minimum RFI interference, absence of arcing, and maintenance free long life are built into the Motogard systems. 

The Motogard Over-Temperature Protection System uses PTC Thermistors to indicate when the equipment has exceeded the set temperature. These thermistors act as a switch, which when reaching the pre-selected temperature will cause the resistance to increase to virtually infinity. This causes the controller to change the state of the contacts. As the equipment cools the “switching action” reverses and the controller will then change the state of the contacts back indicating an “OK” circumstance.

Featuring
• Solid state logic circuitry assuring rapid, spark free noiseless operation with no drift or chatter
• “Fail Safe” operation protecting against sensor lead breakage or loss of power
• Protection against sensor lead short circuit (series 135 and 150 only)
• Solid state or electro-mechanical outputs (Triac in series 115 and 120, Form C electromechanical relay in series 135 and 150

  • Models +

    • 115 Series – Motogard Relay
      • The 115 Series Motogard is designed to take in up to 3 Thermistors wired in Parallel, and has two Triac output relays. The standard 115 Series Motogard relay is designed to operate off of 120VAC +/-10%, Single Phase, 50/60Hz, and is sold under part number 115101-2. There is a special 230VAC input power version available and sold under part number 115202-2.
    • 120 Series – Motogard Relay
      • The 120 Series Motogard is designed to take in up to 3 Thermistors wired in Parallel, and has a single Triac output relay. The 120 Series Motogard relay is designed to operate off of 120VAC +/-10%, Single Phase, 50/60Hz.
    • 135 Series – Motogard Relay
      • The 135 Series Motogard is designed to take in up to 3 Thermistors wired in Parallel, and has a Form C Mechanical Output relay. The 135 Series Motogard relay is designed to operate off of 120VAC +/-10%, Single Phase, 50/60Hz.
    • 150 Series – Motogard Relay
      • The 150 Series Motogard is designed to take in up to 3 Thermistors wired in Series (1 input), and has a Form C Mechanical Output relay. The 150 Series Motogard relay is designed to operate off of 120VAC +/-10%, Single Phase, 50/60Hz.
    • 9967 Series – Motogard Thermistor
      • The Motogard Over-Temperature Protection System uses PTC Thermistors to indicate when the equipment has exceeded the set temperature. These thermistors act as a switch, which when reaching the pre-selected temperature will cause the resistance to increase to virtually infinity. This provides “snap” action response and allows remotely locating the controller without modifications. All PTC thermistors feature high speed over-temperature sensing with no switch point drift or aging. Each Thermistor is encapsulated in a special epoxy for rugged mechanical duty, severe environments, and good thermal conductivity.

  • Documentation +