Contactor Overload Relays

All electric motors have a lifespan, and to keep them running efficiently and safely they must be protected. One of the main causes of failure is electrical overload, sometimes called overcurrent. When a motor draws more current than it is designed to handle it causes the temperature to build-up resulting in overheating. This damages motor windings and coils. It is important to protect the motor and its circuit, and this is where the use of contactor overload relays can help.RS Components offer an extensive range of high-quality contactor overload relays from leading industry brands including Schneider Electric, Siemens, ABB, Eaton, Lovato, and Rockwell Automation.

What is overload protection?

Overload is where a motor draws a high current above its rated value for an extended amount of time. Overload causes overheating of the motor causing damage. To prevent this from happening devices such as contactor relays are specifically designed for industrial control motor protection. They are used with contactors as part of a motor starter or in a control panel or centre.

What are the different types of contactor overload relays?

The motor protection devices can be classified into two main types which are thermal types and electronic types.Thermal overload relaysUtilise a bi-metallic plate located near a heating element. When excessive current is passed through the heating element N/C (Normally Closed) contacts switch over and opens contacts. This interrupts power from flowing to the contactor's control circuit. Thermal overloads usually offer an adjustable current range as well as a manual or automatic reset option.Electronic RelaysElectronic overload relays don't have a bi-metallic mechanism, Instead, they work by using components such as temperature sensors to measure the load current. They are generally more accurate than thermal devices and they usually have a wider current range, a selectable trip class provides enhanced trip protection against single phasing against the motor.


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Description Price FLC Motor Rating Contact Current Rating Control Voltage Range Pole Configuration Mounting Style Contact Voltage Rating Series Normal State Configuration Supply Voltage Power Rating Reset Method Terminal Type Number Of Auxiliary Contacts
RS Stock No. 746-0730
Mfr. Part No.3RH2122-1AF00
BrandSiemens
TWD1,495.00
Each
units
- 10 A - SIRIUS Innovation - - 690 V ac 3RH2 2NO/2NC - - - Screw -
RS Stock No. 744-6747
Mfr. Part No.CA3KN40FD
TWD1,447.00
Each
units
- 10 A - TeSys K - - 690 V dc CA3KN 4NO - - - Screw -
RS Stock No. 493-1239
Mfr. Part No.278440 & ZB12-10
BrandEaton
TWD1,344.00
Each
units
6 → 10 A 10 A 500 V ac - - Direct Contactor 690 V ac ZB NO/NC - 6 W Automatic, Manual Screw 2
RS Stock No. 395-0425
Mfr. Part No.CAD32BD
TWD2,442.00
Each
units
- 10 A 24 V dc TeSys - DIN Rail 690 V dc CAD 3NO/2NC - - - Screw -
RS Stock No. 394-9419
Mfr. Part No.LRD06
TWD1,888.00
Each
units
1 → 1.6 A 1.6 A - TeSys 3P Direct Contactor 690 V ac LRD NO/NC - - Automatic, Manual Screw 2
RS Stock No. 455-6210
Mfr. Part No.BC7-30-10-P01
BrandABB
TWD1,699.00
Each
units
- 9 A - B Range - - 690 V ac BC7 3NO - 5.5 kW - PCB 1
RS Stock No. 746-0759
Mfr. Part No.3RH2140-1AP00
BrandSiemens
TWD1,646.00
Each
units
- 10 A - SIRIUS Innovation - - 690 V ac 3RH2 4NO - - - Screw 4
RS Stock No. 261-5682
Mfr. Part No.LT3SA00M
TWD7,585.00
Each
units
- - 115 V ac, 230 V ac TeSys - - 250 V ac LT3S NO/NC - 100 VA Automatic Cage Clamp 2
RS Stock No. 279-6292
Mfr. Part No.CA3KN31BD
TWD1,181.00
Each
units
- 10 A 24 Vdc TeSys K - DIN Rail Mount, Panel Mount 690 V ac CA3KN 3NO/NC - - - Screw -
RS Stock No. 122-9449
Mfr. Part No.3RT2026-1AL20
BrandSiemens
TWD3,353.00
Each
units
22 A 40 A 230 Vac Sirius Innovation 3P DIN Rail Mount 690 V ac 3RT2 3NO - - - Screw 2
RS Stock No. 746-0733
Mfr. Part No.3RH2122-1AP00
BrandSiemens
TWD1,646.00
Each
units
- 10 A - SIRIUS Innovation - - 690 V ac 3RH2 2NO/2NC - - - Screw -
RS Stock No. 326-813
Mfr. Part No.014565 & ZE-6
BrandEaton
TWD1,867.00
Each
units
4 → 6 A 6 A 600 V ac - - Direct Contactor 690 V ac ZE NO/NC - 6 W Automatic, Manual Screw 2
RS Stock No. 746-0749
Mfr. Part No.3RH2131-1AP00
BrandSiemens
TWD1,646.00
Each
units
- 10 A - SIRIUS Innovation - - 690 V ac 3RH2 3NO/1NC - - - Screw 4
RS Stock No. 323-072
Mfr. Part No.010094 & DILER-40(24V50HZ)
BrandEaton
TWD1,484.00
Each
units
- 3 A - XStart - - 400 V ac DILER 4NO - - - Screw -
RS Stock No. 746-0743
Mfr. Part No.3RH2131-1BB40
BrandSiemens
TWD1,228.00
Each
units
- 10 A - SIRIUS Innovation - - 690 V ac 3RH2 3NO/1NC - - - Screw 4
RS Stock No. 706-1535
Mfr. Part No.3RU2116-1AB0
BrandSiemens
TWD1,615.00
Each
units
1.1 → 1.6 A 1.6 A - Sirius Innovation 3P Direct Contactor 690 V ac 3RU NO/NC - 0.55 kW Automatic, Manual Screw 2
RS Stock No. 122-9438
Mfr. Part No.3RT2016-2JB41
BrandSiemens
TWD1,992.00
Each
units
9 A 22 A 24 Vdc Sirius Innovation 3P DIN Rail Mount 690 V ac 3RT2 3NO - - - Cage Clamp 1
RS Stock No. 837-6976
Mfr. Part No.1SBN020114R1000 TEF4-OFF
BrandABB
TWD2,979.00
Each
units
- 3 A - AF Range - Front Mount 240 V TEF4 1NO + 1NC - - - Screw -
RS Stock No. 818-8537
Mfr. Part No.LRD4367
TWD10,218.00
Each
units
- 95 → 120 A - TeSys - Direct Contactor - LRD - 600 V ac - - Screw -
RS Stock No. 758-989
Mfr. Part No.LR2K0314
TWD1,492.00
Each
units
5.5 → 8 A 8 A 250 V dc, 690 V ac TeSys 3P Direct Contactor 690 V ac LR2K NO/NC - 100 W Automatic, Manual Screw 2