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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Omschrijving Prijs FLC Motor Rating Contact Current Rating Control Voltage Range Pole Configuration Mounting Style Contact Voltage Rating Series Normal State Configuration Power Rating Reset Method Terminal Type Number Of Auxiliary Contacts Width
RS-stocknr. 395-0396
FabrikantnummerCAD32P7
€ 37,31
Each
Aantal stuks
- 10 A - TeSys - - 690 V ac CAD 2NO + 2NC - - Screw - 45mm
RS-stocknr. 759-083
FabrikantnummerCA4KN22BW3
€ 37,36
Each
Aantal stuks
- 10 A 24 Vdc TeSys K - Plate 690 V ac CA4KN 2NO + 2NC - - Screw - 45mm
RS-stocknr. 394-9368
FabrikantnummerLRD12
€ 51,87
Each
Aantal stuks
5.5 → 8 A 8 A - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC - Automatic, Manual Screw 2 45mm
RS-stocknr. 122-9420
Fabrikantnummer3RH2140-2BB40
FabrikantSiemens
€ 38,43
Each
Aantal stuks
- 10 A 24 Vdc Sirius Innovation 4P DIN Rail Mount 690 V ac 3RH2 4NO - - Screw 4 73mm
RS-stocknr. 394-9330
FabrikantnummerLRD21
€ 55,91
Each
Aantal stuks
12 → 18 A 18 A - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC - Automatic, Manual Screw 2 45mm
RS-stocknr. 456-0231
Fabrikantnummer1SAZ311201R1002
FabrikantABB
€ 153,47
Each
Aantal stuks
22 → 32 A 32 A - A Line 3P Clip On 690 V ac TA42 1NO + 1NC 2.91 W Automatic, Manual Screw 2 54mm
RS-stocknr. 746-0737
Fabrikantnummer3RH2122-1BB40
FabrikantSiemens
€ 38,43
Each
Aantal stuks
- 10 A - SIRIUS Innovation - - 690 V ac 3RH2 2NO + 2NC - - Screw - 45mm
RS-stocknr. 493-0393
Fabrikantnummer278439 & ZB12-6
FabrikantEaton
€ 42,58
Each
Aantal stuks
4 → 6 A 6 A 500 Vac - - Direct Contactor 690 V ac ZB 1NO + 1NC 6 W Automatic, Manual Screw 2 45mm
RS-stocknr. 297-2395
Fabrikantnummer066168 & EMT6-DBK
FabrikantEaton
€ 187,42
Each
Aantal stuks
- 3 A 24 → 240 V ac/dc EMT - DIN Rail Mount 400 V ac EMT6 1NO + 1NC 2 W Automatic, Manual Screw 2 78mm
RS-stocknr. 279-6292
FabrikantnummerCA3KN31BD
€ 32,72
Each
Aantal stuks
- 10 A 24 Vdc TeSys K - Plate 690 V ac CA3KN 3NO + 1NC - - Screw - 45mm
RS-stocknr. 297-2373
Fabrikantnummer066167 & EMT6-DB
FabrikantEaton
€ 145,51
Each
Aantal stuks
- 3 A 24 → 240 V ac/dc EMT - DIN Rail Mount 400 V ac EMT6 1NO + 1NC 2 W Manual Screw 2 78mm
RS-stocknr. 685-1429
FabrikantnummerRF383800
FabrikantLovato
€ 50,87
Each
Aantal stuks
32 → 38 A 38 A - - 3P - - RF38 - - Automatic, Manual - - -
RS-stocknr. 394-9403
FabrikantnummerLRD07
€ 56,93
Each
Aantal stuks
1.6 → 2.5 A 2.5 A - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC - Automatic, Manual Screw 2 45mm
RS-stocknr. 394-9346
FabrikantnummerLRD16
€ 56,93
Each
Aantal stuks
9 → 13 A 13 A - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC 6 kV Automatic, Manual Screw 2 45mm
RS-stocknr. 394-9419
FabrikantnummerLRD06
€ 51,87
Each
Aantal stuks
1 → 1.6 A 1.6 A - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC - Automatic, Manual Screw 2 45mm
RS-stocknr. 758-939
FabrikantnummerLR2K0306
€ 41,40
Each
Aantal stuks
0.8 → 1.2 A 1.2 A 250 V dc, 690 V ac TeSys 3P Direct Contactor 690 V ac LR2K 1NO + 1NC 100 W Automatic, Manual Screw 2 45mm
RS-stocknr. 394-9324
FabrikantnummerLRD22
€ 58,47
Each
Aantal stuks
16 → 24 A 24 A - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC - Automatic, Manual Screw 2 45mm
RS-stocknr. 456-0225
Fabrikantnummer1SAZ311201R1001
FabrikantABB
€ 146,96
Each
Aantal stuks
18 → 25 A 25 A - A Line 3P Clip On 690 V ac TA42 1NO + 1NC 3.43 W Automatic, Manual Screw 2 54mm
RS-stocknr. 394-9352
FabrikantnummerLRD14
€ 56,93
Each
Aantal stuks
7 → 10 A 10 A - TeSys 3P Direct Contactor 690 V ac LRD 1NO + 1NC - Automatic, Manual Screw 2 45mm
RS-stocknr. 800-7377
Fabrikantnummer1SAZ811201R1006 TF65-60
FabrikantABB
€ 181,23
Each
Aantal stuks
60 A 6 A 690 Vac AF Range 3P Under Contactor Mount 600 V ac/dc TF65 1NO + 1NC - Automatic, Manual Flat 2 87.7mm