Contactors
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.
Showing 1–24 of 584 results
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CONTACTOR, DEFINITE PURPOSE, MODEL 96
IDR0.00 -
RED SAFETY COVER 9A TO 65A
IDR46,885.83 -
3P MINICONTACTOR BG09.10A 400V 50-60HZ
IDR461,096.44 -
CONTACTOR 3P 32 A 1NO AUX 24VAC
IDR2,554,595.95 -
AUX. SWITCH 2NO+2NC S00 & S0 SCREW
IDR608,257.11 -
CONTACTOR S00 16A 120VAC 1NO SCREW
IDR1,809,037.83 -
CONTACTOR S00 7A 120VAC 1NO SCREW
IDR1,116,868.72 -
4 POLE CONT 2NO + 2NC 25 AMP
IDR1,750,299.43 -
CONTACTOR 600VAC 18AMP IEC +OPTIONS
IDR1,411,190.06 -
CONTACTOR MINIATURE 3 HP 12 VDC 1 NO AUX
IDR448,719.42 -
LW205 TERMINAL ENLARGEMENT
IDR1,205,920.33 -
LW140 TERMINAL ENLARGEMENT
IDR297,258.26 -
LL146-30 CONN. SOCKET *PACK OF 6 PCS*
IDR405,190.07Pack (1 Pack of 6) -
LT140-30L TERMINAL SHROUD *PACK 2 PCS*
IDR403,616.72Pack (1 Pack of 2) -
3 POLE 65A 50-500V 50/60HZ-DC CONTACTOR
IDR3,363,612.52 -
ACTI9 ICT CONTACTOR 16A 2NO 230/240VAC
IDR1,062,221.03 -
-15.40%
ACTI9 OF+SD 24VDC AUXILIARY CONTACT TI24
IDR1,125,050.14IDR588,328.01 -
MODULAR CONTACTOR NO/NC 25A 12VAC/DC
IDR642,346.36 -
4 POLE CONTACTOR 24 TO 60V
IDR626,507.97 -
4 POLE CONTACTOR 25A 24-60VAC/DC 4NO
IDR509,345.84 -
3 POLE CONTACTOR 18.5KW 24-60AC, 20-60DC
IDR2,290,587.82 -
4 POLE CONTACTOR 55A 24-60VAC/DC 4NO
IDR1,951,898.01 -
AUX SWITCH BLOCK,1NO+1NC,S0-S12
IDR309,110.83 -
3 POLE CONTACTOR,7.5KW,16A,240VAC,1NO
IDR622,522.15
