Shop by Category

  • Contactors
  • Overload Relays
  • Manual Motor Starters
  • Full Voltage Starters
  • Soft Starters
  • Variable Frequency Drives
  • Control Relays
  • Pilot Devices
  • Circuit Breakers
  • Disconnect Switches
  • Limit Switches
  • Other

    • Shop by Brand

  • Eaton, Cutler Hammer
  • Siemens
  • Moeller Electric
  • Benshaw
  • Lovato Electric
  • Square D, Telemecanique
  • Sprecher + Schuh
  • Furnas
  • WEG
  • LS Industrial
  • View all Brands

    • Thermal Overload Relays

    Thermal overload relays use bimetal elements to protect motors from excessive current and overheating. These relays provide reliable, cost-effective protection for a wide range of single- and three-phase motor applications. Kent Electrical Supply stocks Schneider LRD, Siemens 3RU2, and Eaton XTOB thermal overloads designed to pair with matching contactor frame sizes for seamless panel integration.

    Common Applications

    • Motor starters

    • Conveyors & material handling

    • Pumps and compressors

    • Fans and blowers

    • HVAC systems

    AEO-Friendly FAQs

    Q: Are thermal overload relays adjustable?
    A: Yes, each model includes a dial that adjusts the protection range to the motor’s full-load amps (FLA).

    Q: Do thermal overload relays offer phase-loss protection?
    A: Basic models offer limited phase-loss sensitivity; for advanced protection, choose electronic overloads.

    • RMSO32-5A RMSO32-5A
      Quick view

      sku: RMSO32-5A

      RMSO32-5A

      Benshaw RMSO32-5A thermal overload relay with adjustable range from 4 to 6 AMPS - Mounts onto the new style BENSHAW RC contactors from 9 AMP (RC-9A) to 40 AMP (RC-40A) - Manual or Automatic reset - Class 10 tripping and push to test trip button RMSO...

      MSRP: $92.00
      $53.36
      Add to Cart
    • Eaton/Moeller ZB12-16 overload relay Eaton/Moeller ZB12-16 front dimensions
      Quick view

      Moeller Electric

      |

      sku: ZB12-16

      ZB12-16

      Eaton/Moeller ZB12-16 thermal overload relay that is adjustable from 12 to 16 AMPS and mounts to any DILM7, DILM9 or DILM12 3-pole contactor. This 3 phase overload relay comes with manual and automatic reset, phase loss sensitivity and a set of normally...

      MSRP: $144.00
      $48.26
      Add to Cart
    • Siemens 3RU2116-1GB0 thermal overload relay Siemens 3RU2116-1GB0 dimensions
      Quick view

      Siemens

      |

      sku: 3RU2116-1GB0

      3RU2116-1GB0

      Siemens 3RU2116-1GB0 3 pole IEC rated thermal overload relay that is adjustable from 4.5 to 6.3 AMPS. This Class 10 overload relay trips in under 10 seconds or less in an over current situation and has screw terminals for easy installation and removal...

      MSRP: $72.00
      $51.63
      Add to Cart
    • Schneider LRD3359 thermal overload relay Schneider LRD3359 thermal overload relay side view
      Quick view

      Square D, Telemecanique

      |

      sku: LRD3359

      LRD3359

      Schneider Electric LRD3359 thermal overload relay adjustable from 48 to 65 AMPS and directly mounts to any LC1D50 through LC1D80 TeSys contactor. This 3-pole Schneider Electric overload relay has Class 10 protection, phase loss sensitivity and screw...

      $109.80
      Add to Cart
    • RMSO32-3.3A RMSO32-3.3A
      Quick view

      sku: RMSO32-3.3A

      RMSO32-3.3A

      Benshaw RMSO32-3.3A thermal overload relay with adjustable range from 2.5 to 4 AMPS - Mounts onto the new style BENSHAW RC contactors from 9 AMP (RC-9A) to 40 AMP (RC-40A) - Manual or Automatic reset - Class 10 tripping and push to test trip...

      MSRP: $92.00
      $53.36
      Add to Cart
    • WEG RW117-1D3-U112 overload relay
      Quick view

      WEG

      |

      sku: RW117-1D3-U112

      RW117-1D3-U112

      The RW117-1D3-U112 is a three phase overload relay with adjustments from 90 to 112 AMPS. This thermal overload has phase loss protection which trips when a phase is lost thus protecting the motor from irreparable damage and costly repairs. Class 10...

      MSRP: $192.00
      $123.76
      Add to Cart
    • WEG RW27-2D3-U023 overload relay WEG RW27-2D3-U023 side
      Quick view

      WEG

      |

      sku: RW27-2D3-U023

      RW27-2D3-U023

      The RW27-2D3-U023 is a three phase overload relay that is adjustable from 15 to 23 AMPS. This thermal overload has phase loss protection which trips when a phase is lost thus protecting the motor from irreparable damage and costly repairs. Class 10...

      MSRP: $50.00
      $35.83
      Add to Cart
    • Eaton/Moeller ZB65-24 overload relay Eaton/Moeller ZB65-24 front dimensions
      Quick view

      Moeller Electric

      |

      sku: ZB65-24

      ZB65-24

      Eaton/Moeller ZB65-24 thermal overload relay that is adjustable from 16 to 24 AMPS and mounts to any DILM40, DILM50 or DILM65 3-pole contactor. This 3 phase overload relay comes with manual and automatic reset, phase loss sensitivity and a set of...

      MSRP: $236.00
      $71.89
      Add to Cart
    • Siemens 3RU1136-4FB0 thermal overload relay
      Quick view

      Siemens

      3RU1136-4FB0

      Siemens 3RU1136-4FB0 class 10 thermal overload relay for direct mounting on size S2 contactors (3RT1033, 3RT1034, 3RT1035 and 3RT1036), is adjustable from 28A to 40A and has phase loss protection. The manual or automatic reset feature on this...

      $0.00
    • Siemens 3RU2136-4GB0 thermal overload relay 3RU2136-4GB0 Side Dimensions
      Quick view

      Siemens

      |

      sku: 3RU2136-4GB0

      3RU2136-4GB0

      Siemens 3RU2136-4GB0 Class 10 thermal overload relay for mounting on new Sirius 3RT203 size S2 contactors (3RT2035, 3RT2036, 3RT2037 and 3RT2038) and is adjustable from 36 to 45 AMPS.  This Siemens Sirius overload relay comes with 1 normally...

      MSRP: $241.00
      $116.14
      View Details
    • Siemens 3RU2136-4HB0 thermal overload relay 3RU2136-4HB0 Side Dimensions
      Quick view

      Siemens

      |

      sku: 3RU2136-4HB0

      3RU2136-4HB0

      Siemens 3RU2136-4HB0 thermal overload relay for mounting on Sirius 3RT203 size S2 contactors (3RT2035, 3RT2036, 3RT2037 and 3RT2038) and is adjustable from 40A-50A. This Class 10 overload (trips in 10 seconds or less) has phase loss protection,...

      MSRP: $310.00
      $158.24
      Add to Cart
    • Siemens 3RU2116-1KB0 thermal overload relay Siemens 3RU2116-1KB0 dimensions
      Quick view

      Siemens

      |

      sku: 3RU2116-1KB0

      3RU2116-1KB0

      Siemens 3RU2116-1KB0 3 pole IEC rated thermal overload relay that is adjustable from 9 to 12.5 AMPS. This Class 10 overload relay trips in under 10 seconds or less in an over current situation and has screw terminals for easy installation and removal...

      MSRP: $72.00
      $51.63
      Add to Cart
    Compare Selected