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.


...
Read more Read less

Filters

Viewing 1 - 20 of 935 products
Results per page
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. 394-9318
Mfr. Part No.LRD32
€57.01
Each
units
23 → 32 A 32 A - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC - 600 V Automatic, Manual Screw 2
RS Stock No. 502-414
Mfr. Part No.700-K22Z-ZJ
€41.60
Each
units
- 10 A - 700 Series - - 690 V ac 700K 2NC - - - Screw -
RS Stock No. 758-989
Mfr. Part No.LR2K0314
€31.71
Each
units
5.5 → 8 A 8 A 250 V dc, 690 V ac TeSys 3P Direct Contactor 690 V ac LR2K 1NO + 1NC - 100 W Automatic, Manual Screw 2
RS Stock No. 727-6210
Mfr. Part No.LRD340
€66.85
Each
units
30 → 40 A 40 A - TeSys D - Under Contactor Mount 1 kV ac LRD 1NO + 1NC - - - Screw 2
RS Stock No. 394-9380
Mfr. Part No.LRD08
€36.42
Each
units
2.5 → 4 A 4 A - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC - - Automatic, Manual Screw 2
RS Stock No. 746-0759
Mfr. Part No.3RH2140-1AP00
BrandSiemens
€27.13
Each
units
- 10 A - SIRIUS Innovation - - 690 V ac 3RH2 4NO - - - Screw 4
RS Stock No. 394-9324
Mfr. Part No.LRD22
€46.89
Each
units
16 → 24 A 24 A - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC - - Automatic, Manual Screw 2
RS Stock No. 394-9368
Mfr. Part No.LRD12
€36.42
Each
units
5.5 → 8 A 8 A - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC - - Automatic, Manual Screw 2
RS Stock No. 394-9419
Mfr. Part No.LRD06
€36.42
Each
units
1 → 1.6 A 1.6 A - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC - - Automatic, Manual Screw 2
RS Stock No. 608-7261
Mfr. Part No.CAD32ED
€52.25
Each
units
- 10 A - TeSys - - 690 V dc CAD 2NO + 2NC - - - Screw -
RS Stock No. 394-9330
Mfr. Part No.LRD21
€43.92
Each
units
12 → 18 A 18 A - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC - - Automatic, Manual Screw 2
RS Stock No. 394-9425
Mfr. Part No.LRD05
€36.42
Each
units
0.63 → 1 A 1 A - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC - - Automatic, Manual Screw 2
RS Stock No. 394-9431
Mfr. Part No.LRD04
€36.42
Each
units
0.4 → 0.63 A 630 mA - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC - - Automatic, Manual Screw 2
RS Stock No. 608-7148
Mfr. Part No.CA2KN22P7
€25.67
Each
units
- 10 A - TeSys K - DIN Rail Mount 690 V ac CA2KN 2NO + 2NC - - - Screw -
RS Stock No. 527-3714
Mfr. Part No.193-EEDB
€99.70
Each
units
3.2 → 16 A 16 A 690 Vac Bulletin 3P Clip On 690 V ac 193-E1 Plus 1NO + 1NC - 150 mW Automatic, Manual Screw 2
RS Stock No. 394-9403
Mfr. Part No.LRD07
€36.42
Each
units
1.6 → 2.5 A 2.5 A - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC - - Automatic, Manual Screw 2
RS Stock No. 685-1309
Mfr. Part No.RF381000
BrandLovato
€37.34
Each
units
6.3 → 10 A 10 A - - 3P - - RF38 - - - Automatic, Manual - -
RS Stock No. 746-0737
Mfr. Part No.3RH2122-1BB40
BrandSiemens
€31.43
Each
units
- 10 A - SIRIUS Innovation - - 690 V ac 3RH2 2NO + 2NC - - - Screw -
RS Stock No. 122-9420
Mfr. Part No.3RH2140-2BB40
BrandSiemens
€31.43
Each
units
- 10 A 24 Vdc Sirius Innovation 4P DIN Rail Mount 690 V ac 3RH2 4NO - - - Screw 4
RS Stock No. 758-945
Mfr. Part No.LR2K0307
€31.71
Each
units
1.2 → 1.8 A 1.8 A 250 V dc, 690 V ac TeSys 3P Direct Contactor 690 V ac LR2K 1NO + 1NC - 100 W Automatic, Manual Screw 2