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.

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Moeller Electric
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sku: ZB65-16

ZB65-16

MSRP: $200.00

Now: $71.89

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Lovato Electric
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sku: 11RF915

11RF915

MSRP: $59.51

Now: $44.27

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Siemens

3RU1126-1DB0

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Now: $0.00

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Siemens

3RU1126-1FB0

MSRP: $72.00

Now: $50.59

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Siemens

3RU1126-1KB0

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Siemens

3RU1136-1KB0

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Siemens

3RU1136-4BB0

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Siemens

3RU1136-4DB0

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Siemens

3RU1146-4MB0

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Siemens

3RU2126-1DB0

MSRP: $86.00

Now: $55.46

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Siemens
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sku: 3RU2126-1EB1

3RU2126-1EB1

MSRP: $104.00

Now: $61.10

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Siemens
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sku: 3RU2126-1HB1

3RU2126-1HB1

MSRP: $104.00

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Moeller Electric
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sku: ZB65-16

ZB65-16

Eaton/Moeller ZB65-16 thermal overload relay that is adjustable from 10 to 16 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: $200.00

Now: $71.89
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Lovato Electric
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sku: 11RF915

11RF915

Lovato Electric 11RF915 overload relay adjustable from 9 to 15 AMP and mounts to any BG06, BG09 or BG12 miniature 3-pole contactors. This overload relay has phase loss protection (single phase sensitivity), manual reset option and screw terminals for...

MSRP: $59.51

Now: $44.27
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Siemens

3RU1126-1DB0

Siemens 3RU1126-1DB0 class 10 thermal overload relay for direct mounting on size S0 contactors (3RT1023, 3RT1024, 3RT1025 and 3RT1026), is adjustable from 2.2A to 3.2A and has phase loss protection. The manual or automatic reset feature on this...

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Siemens

3RU1126-1FB0

Siemens 3RU1126-1FB0 class 10 thermal overload relay for direct mounting on size S0 contactors (3RT1023, 3RT1024, 3RT1025 and 3RT1026), is adjustable from 3.5A to 5A and has phase loss protection. The manual or automatic reset feature on this...

MSRP: $72.00

Now: $50.59
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Siemens

3RU1126-1KB0

Siemens 3RU1126-1KB0 class 10 thermal overload relay for direct mounting on size S0 contactors (3RT1023, 3RT1024, 3RT1025 and 3RT1026), is adjustable from 9A to 12.5A and has phase loss protection. The manual or automatic reset feature on this...

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Siemens

3RU1136-1KB0

Siemens 3RU1136-1KB0 class 10 thermal overload relay for direct mounting on size S2 contactors (3RT1033, 3RT1034, 3RT1035 and 3RT1036), is adjustable from 9A to 12.5A and has phase loss protection. The manual or automatic reset feature on this...

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Now: $0.00
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Siemens

3RU1136-4BB0

Siemens 3RU1136-4BB0 class 10 thermal overload relay for direct mounting on size S2 contactors (3RT1033, 3RT1034, 3RT1035 and 3RT1036), is adjustable from 14A to 20A and has phase loss protection. The manual or automatic reset feature on this...

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Now: $0.00
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Siemens

3RU1136-4DB0

Siemens 3RU1136-4DB0 class 10 thermal overload relay for direct mounting on size S2 contactors (3RT1033, 3RT1034, 3RT1035 and 3RT1036), is adjustable from 18A to 25A and has phase loss protection. The manual or automatic reset feature on this...

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Now: $0.00
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Siemens

3RU1146-4MB0

Siemens 3RU1146-4MB0 class 10 thermal overload relay for direct mounting on size S3 contactors (3RT1044, 3RT1045, and 3RT1046), is adjustable from 80A to 100A and has phase loss protection. The manual or automatic reset feature on this Sirius...

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Siemens

3RU2126-1DB0

The Siemens 3RU2126-1DB0 overload relay is adjustable from 2.2 to 3.2 AMPS, has a manual or automatic reset option and mounts to any 3RT2 size 0 contactor from 9 to 38 AMPS. This UL rated thermal overload relay comes with phase loss...

MSRP: $86.00

Now: $55.46
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Siemens
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sku: 3RU2126-1EB1

3RU2126-1EB1

Siemens Sirius 3RT2126-1EB1 3 pole IEC rated separate mount thermal overload relay that is adjustable from 2.8 to 4.0 AMPS. Unit has class 10 tripping (trips in under 10 seconds or less), screw terminals, Manual or Automatic reset, 1 N.O. and 1 N.C...

MSRP: $104.00

Now: $61.10
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Siemens
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sku: 3RU2126-1HB1

3RU2126-1HB1

Siemens Sirius 3RT2126-1HB1 3 pole IEC rated separate mount thermal overload relay that is adjustable from 5.5 to 8.0 AMPS. Unit has class 10 tripping (trips in under 10 seconds or less), screw terminals, Manual or Automatic reset, 1 N.O. and 1 N.C...

MSRP: $104.00

Now: $61.10
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Common Applications

AEO-Friendly FAQs