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庫存編號 866-5882
製造零件編號3RH2244-1AK60
BrandSiemens
HK$533.41
單位
- 6 A - SIRIUS Innovation - - 690 V ac 3RH2 4NO + 4NC - - - Screw 8
RS庫存編號 394-9374
製造零件編號LRD10
HK$456.51
單位
4 → 6 A 6 A - TeSys 3P Direct Contactor 690 V ac LRD NO/NC - - Automatic, Manual Screw 2
RS庫存編號 394-9346
製造零件編號LRD16
HK$570.75
單位
9 → 13 A 13 A - TeSys 3P Direct Contactor 690 V ac LRD NO/NC - 6 kV Automatic, Manual Screw 2
RS庫存編號 394-9318
製造零件編號LRD32
HK$635.82
單位
23 → 32 A 32 A - TeSys 3P Direct Contactor 690 V ac LRD NO/NC - 600 V Automatic, Manual Screw 2
RS庫存編號 394-9403
製造零件編號LRD07
HK$437.24
單位
1.6 → 2.5 A 2.5 A - TeSys 3P Direct Contactor 690 V ac LRD NO/NC - - Automatic, Manual Screw 2
RS庫存編號 758-951
製造零件編號LR2K0308
HK$301.06
單位
1.8 → 2.6 A 2.6 A 250 V dc, 690 V ac TeSys 3P Direct Contactor 690 V ac LR2K NO/NC - 100 W Automatic, Manual Screw 2
RS庫存編號 394-9368
製造零件編號LRD12
HK$652.11
單位
5.5 → 8 A 8 A - TeSys 3P Direct Contactor 690 V ac LRD NO/NC - - Automatic, Manual Screw 2
RS庫存編號 394-9380
製造零件編號LRD08
HK$467.63
單位
2.5 → 4 A 4 A - TeSys 3P Direct Contactor 690 V ac LRD NO/NC - - Automatic, Manual Screw 2
RS庫存編號 394-9330
製造零件編號LRD21
HK$825.18
單位
12 → 18 A 18 A - TeSys 3P Direct Contactor 690 V ac LRD NO/NC - - Automatic, Manual Screw 2
RS庫存編號 638-7432
製造零件編號3RB2056-1FC2
BrandSiemens
HK$3,126.92
單位
50 → 200 A 315 A - Sirius Classic 3P Direct Contactor 1 kV ac 3RB NO/NC - 90 kW Automatic, Manual Screw 2
RS庫存編號 493-0539
製造零件編號276379 & DILA-31(24VDC)
BrandEaton
HK$395.65
單位
- 4 A - XStart - - 415 V ac DILA 3NO/1NC - - - Screw -
RS庫存編號 513-0308
製造零件編號278458 & ZB65-40
BrandEaton
HK$904.40
單位
24 → 40 A 40 A 500 V ac - - Direct Contactor 690 V ac ZB65 NO/NC - 7.5 W Automatic, Manual Screw 2
RS庫存編號 706-1572
製造零件編號3RU2116-1GC0
BrandSiemens
HK$447.20
單位
4.5 → 6.3 A 6.3 A - Sirius Innovation 3P Direct Contactor 690 V ac 3RU NO/NC - 2.2 kW Automatic, Manual Cage Clamp 2
RS庫存編號 133-179
製造零件編號8TT92RS
BrandEaton
HK$803.86
單位
7 → 10 A 10 A - - - Direct Contactor 415 V ac ADS8 NO/NC - 4 kW Automatic - 1
RS庫存編號 758-945
製造零件編號LR2K0307
HK$301.06
單位
1.2 → 1.8 A 1.8 A 250 V dc, 690 V ac TeSys 3P Direct Contactor 690 V ac LR2K NO/NC - 100 W Automatic, Manual Screw 2
RS庫存編號 394-9352
製造零件編號LRD14
HK$466.49
單位
7 → 10 A 10 A - TeSys 3P Direct Contactor 690 V ac LRD NO/NC - - Automatic, Manual Screw 2
RS庫存編號 727-6210
製造零件編號LRD340
HK$766.31
單位
30 → 40 A 40 A - TeSys D - Under Contactor Mount 1 kV ac LRD NO/NC - - - Screw 2
RS庫存編號 394-9324
製造零件編號LRD22
HK$605.33
單位
16 → 24 A 24 A - TeSys 3P Direct Contactor 690 V ac LRD NO/NC - - Automatic, Manual Screw 2
RS庫存編號 493-0387
製造零件編號278438 & ZB12-4
BrandEaton
HK$451.51
單位
2.4 → 4 A 4 A 500 V ac - - Direct Contactor 690 V ac ZB NO/NC - 6 W Automatic, Manual Screw 2
RS庫存編號 744-6725
製造零件編號CA2SK20B7
HK$349.86
單位
- 10 A - TeSys K - - 690 V ac CA2SK 2NO - - - Connector -