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Thermal overload relays for IEC contactors provide reliable and accurate thermally-operated protection from device or component overload or phase loss. Available in various amperage capacities, these bi-metallic relays offer adjustable trip settings for application flexibility.
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Thermal Overload Relays
Category Selection
Thermal overload relays, when paired with IEC contactors, create across-the-line starters that reliably protect against device or component overloads. Modern design eliminates heater elements, and instead uses fixed bimetallic components. These Eaton, Fuji Electric, Schneider Electric, WEG Electric, and our own AutomationDirect and IronHorse brand overload relays are designed to mount directly to the corresponding series and size of the contactor, and will detect excessive current due to overloads, locked rotor current, or open phases which could result in damage to the motor windings.
For part listings and specifications, go to Shop Now
Fuji Electric TK-E Series
TK-E series thermal overload relays are designed for use with Fuji SC-E series contactors and feature an adjustable current range up to 160A.
- Overload, phase loss protection
- Isolated N.O. and N.C. contacts
- Ambient temperature compensation
- Trip indicator
- Finger protection terminals
- Optional base units for separate mounting
- IEC-947, UL, CSA, CE
Starting at
$44.00
(TK26E-1P1)
Fuji Electric 3N Series
3N series thermal overload relays are compatible with Fuji Odyssey 3N contactors and feature an adjustable current range up to 360A.
- Overload, phase loss protection
- Isolated N.O. and N.C. contacts
- Ambient temperature compensation
- Trip indicator
- Protective terminal covers available
- IEC-947, UL, CSA, CE
Starting at
$202.00
(3NK4QL)
WEG Electric RW17 Series
RW17 series adjustable motor overload relays are designed for use with WEG CWC series contactors, with current ratings up to 23A.
- (1) N.O. and (1) N.C. contact
- Class 10A trip class
- Adjustable trip current
- Phase-loss sensitivity (All phases must be connected - see motor wiring diagrams)
- Ambient temperature compensation
- Hand/Auto/Reset button
- IP20 finger protection
Priced at
$21.00
(RW17-1D3-D004)
WEG Electric RW27/67/117 Series
RW27/67/117 series adjustable motor overload relays are designed for use with WEG CWB series contactors, with current ratings up to 140A. Accessories are available for separate mounting.
- (1) N.O. and (1) N.C. contact
- Class 10A trip class
- Adjustable trip current
- 3-pole version available
- Ambient temperature compensation
- Phase-loss and current unbalance sensitivity protection
- Hand/Auto/Reset button
Starting at
$28.50
(RW27-2D3-D008)
Schneider Electric Easy TeSys Series
New!
Easy TeSys series IEC thermal overload relays are designed for direct connection to Easy TeSys (DPE) contactors and feature an adjustable current range. These three-pole thermal overload relays protect AC circuits and motors against overloads, phase failures, long starting times, and prolonged stalled rotor conditions.
- In ratings up to 32A
- Phase-loss and current unbalance sensitivity protection
- Class 10A trip class
- Isolated N.O. and N.C. contacts
- Ambient temperature compensation
- Test and reset button
- Lockable settings dial cover
- Selector for manual or automatic reset
Starting at
$29.50
(DPER01)
IronHorse HTOR Series
HTOR series bimetal-style overload relays protect AC circuits and motors against overloads, phase loss, long starting times, and prolonged stalling of the motor.
- Available in multiple frame sizes, in ratings up to 400A
- Phase-loss and current unbalance sensitivity protection
- Class 10A trip class
- Isolated N.O. and N.C. contacts
- Adjustable trip current
- Ambient temperature compensation
- IP20 finger protection
Starting at
$23.00
(HTOR32-0.16-S)
AutomationDirect RTD Series
RTD series adjustable motor overload relays are designed for use with GH15 Series contactors with current ratings up to 320A.
- (1) N.O. and (1) N.C. contact
- Adjustable current range
- Manual Stop button
- Test function
- Manual/Auto reset
- IP20 finger protection
Starting at
$74.00
(RTD32-60)
Eaton C306 Series
The C306 thermal overload relay is intended for use with Eaton Freedom Series AE16 motor starters. They feature electrically-isolated N.O. or N.C. contacts and require heater packs that are sold separately.
- Selectable manual or automatic reset operations
- Isolated N.O. or N.C. contacts
- Interchangeable Class 20 heater packs match motor FLA , calibrated for 1.0 and 1.15 service factors (ordered separately)
- Integral load lugs allow field wiring prior to heater pack installation
- Single-phase protection
- Ambient temperature compensation
- IP20 finger protection
Starting at
$262.00
(C306DN3B)
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