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PRESSURE SWITCHES > MDR3 Series Pressure Switches
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The MDR3 series Combination Pressure Switch with Integral Overload Relay offers a simple, straight forward way of directly controlling the compressor or pump motor and providing overload motor protection, without the need of a separate motor starter. This Patented pressure switch offers an industry first - an Integral Thermal Overload which has been incorporated into the pressure switch to prevent an overloaded condition from burning out the compressor or pump motor. The unique combination of the reliable Advance Controls pressure switch and an integral thermal overload allows the MDR3 to replace old fashioned separate pressure switch / starter combinations. It is UL Listed (UL 508) to start and stop a single or three phase compressor / pump motor directly across the line. No other device or method of controlling a compressor pump motor offers the flexibility, cost savings, compact size and value as does the MDR3 Series Combination Pressure Switch with Integral Overload Relay.

  • Combines functions of both a pressure switch and a motor starter
  • Wide variety of factory pressure settings
  • Integral adjustable motor overload
  • "Off / Auto" switch on cover - standard
  • Unloader valve - standard on air compressor switches
  • Four way flange available
  • Oversized inlet ports available


Ordering Information
Order the Advance Controls MDR3 series Pressure Switch by the Catalog Number as shown in the MDR3 Pressure Switch Selection Table

  1. Determine the factory pressure setting required.
  2. Determine the motor horsepower or the full load amps of the motor.
  3. Select the needed MDR3 Pressure Switch. In all cases, the motor full load amps must be within the "Overload Amp Range" as shown in the selection table.
  4. Select any required Accessories or Options.


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