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 1120 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. 394-9368
Mfr. Part No.LRD12
kr 492,48
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. 394-9330
Mfr. Part No.LRD21
kr 596,16
Each
Units
12 → 18 A 18 A - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC - - Automatic, Manual Screw 2
RS Stock No. 395-0396
Mfr. Part No.CAD32P7
kr 427,68
Each
Units
- 10 A - TeSys - - 690 V ac CAD 2NO + 2NC - - - Screw -
RS Stock No. 685-1488
Mfr. Part No.11BG0022A230
BrandLovato
kr 214,43
Each
Units
- 10 A - Orange - - 690 V ac BG 2NO + 2NC - - - Screw -
RS Stock No. 394-9431
Mfr. Part No.LRD04
kr 492,48
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. 685-1453
Mfr. Part No.RF381800
BrandLovato
kr 352,66
Each
Units
13 → 18 A 18 A - - 3P - - RF38 - - - Automatic, Manual - -
RS Stock No. 781-2620
Mfr. Part No.LEV200A4ANA 1618387-3
kr 1 269,34
Each
Units
- 500 A - KILOVAC - - - LEV200 1NO - - - Lug Ring Terminal -
RS Stock No. 394-9352
Mfr. Part No.LRD14
kr 492,48
Each
Units
7 → 10 A 10 A - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC - - Automatic, Manual Screw 2
RS Stock No. 394-9403
Mfr. Part No.LRD07
kr 492,48
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. 609-8019
Mfr. Part No.LR9F7379
kr 5 482,08
Each
Units
300 → 500 A 630 A - TeSys - Direct Contactor 1 kV ac LR9F - 24 V dc 100 W Manual Screw -
RS Stock No. 394-9374
Mfr. Part No.LRD10
kr 492,48
Each
Units
4 → 6 A 6 A - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC - - Automatic, Manual Screw 2
RS Stock No. 394-9380
Mfr. Part No.LRD08
kr 492,48
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. 758-951
Mfr. Part No.LR2K0308
kr 427,68
Each
Units
1.8 → 2.6 A 2.6 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. 394-9425
Mfr. Part No.LRD05
kr 492,48
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. 261-5711
Mfr. Part No.LT3SA00MW
kr 1 866,24
Each
Units
- - 24 → 230 Vac/dc TeSys - - 250 V ac LT3S 1NO + 1NC - 100 VA Automatic Cage Clamp 2
RS Stock No. 394-9419
Mfr. Part No.LRD06
kr 492,48
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. 609-8003
Mfr. Part No.LR9F7375
kr 5 002,56
Each
Units
200 → 330 A 630 A - TeSys - Direct Contactor 1 kV ac LR9F - 24 V dc 100 W Manual Screw -
RS Stock No. 685-1309
Mfr. Part No.RF381000
BrandLovato
kr 312,19
Each
Units
6.3 → 10 A 10 A - - 3P - - RF38 - - - Automatic, Manual - -
RS Stock No. 122-9429
Mfr. Part No.3RT2015-1HB41
BrandSiemens
kr 446,81
Each
Units
6.1 A 18 A 24 Vdc Sirius Innovation 3P DIN Rail Mount 690 V ac 3RT2 3NO - - - Screw 1
RS Stock No. 395-0425
Mfr. Part No.CAD32BD
kr 803,52
Each
Units
- 10 A 24 Vdc TeSys - DIN Rail Mount 690 V dc CAD 2NO + 2NC - - - Screw -