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.
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Eaton Contactor Mounting Support for use with ZB65 Series
VND663,766.40 -
Eaton Auxiliary Contact - 4NO, 4 Contact, Front Mount, 4 A ac, 10 A dc
VND664,917.44 -
Schneider Electric TeSys K LC1K 3 Pole Contactor - 6 A, 230 V ac Coil, 3NO, 2.2 kW
VND666,644.00 -
Eaton Surge Suppressor for use with DILK12 to DILK25 Series, DILM17 to DILM32 Series, DILMP32 to DILMP45 Series
VND675,852.32 -
Schneider Electric Auxiliary Contact Block - 1NO + 3NC, 4 Contact, Front Mount
VND685,828.00 -
ABB Auxiliary Contact - 4NO, 4 Contact, Front Mount, 6 A
VND686,595.36 -
ABB Auxiliary Contact - 4NO, 4 Contact, Front Mount, 6 A
VND686,595.36 -
ABB Auxiliary Contact - 4NO, 4 Contact, Front Mount, 6 A
VND686,595.36 -
ABB Auxiliary Contact - 1NC + 3NO, 4 Contact, Front Mount, 6 A
VND686,595.36 -
Schneider Electric Link for use with LC Series
VND687,362.72 -
ABB Auxiliary Contact - 2NC + 2NO, 4 Contact, Front Mount, 6 A
VND687,746.40 -
Schneider Electric TeSys K LC1K 3 Pole Contactor - 6 A, 24 V ac Coil, 3NO, 2.2 kW
VND697,530.24 -
Siemens Sirius Innovation Contactor Surge Suppressor for use with 3RH2, Size S00
VND697,722.08 -
Schneider Electric TeSys Auxiliary Contact - 2NC + 2NO, 4 Contact, Front Mount, 10 A
VND699,640.48 -
Eaton Auxiliary Contact - 2NC + 2NO, 4 Contact, Front Mount, 2.5 A dc, 4 A ac
VND707,122.24 -
Eaton Auxiliary Contact - 4NO, 4 Contact, Front Mount, 2.5 A dc, 4 A ac
VND720,551.04 -
Siemens Sirius Innovation Auxiliary Switch Block - 1NC + 1NO, 2 Contact, Snap-On, 10 A
VND725,155.20 -
Eaton Auxiliary Contact - 2NC + 2NO, 4 Contact, Front Mount, 2.5 A dc, 4 A ac
VND728,032.80 -
ABB Terminal Cover for use with AF116 → AF370 Series
VND738,200.32Pack (1 Pack of 2) -
Phoenix Contact Motor Protection Circuit Breaker -
VND741,845.28 -
Eaton Surge Suppressor for use with DILK33 to DILK50 Series, DILM40 to DILM95 Series, DILMP63 to DILMP200 Series
VND747,024.96 -
DIN Rail Mount Auxiliary Contact, NC/NO, 10 A, 24 V ac/dc
VND755,274.08 -
Siemens Sirius Innovation Auxiliary Contact - 1NC + 1NO, 2 Contact, Plug In, 2 A dc, 10 A ac
VND761,796.64 -
Siemens Sirius Innovation Auxiliary Contact - 2NO, 2 Contact, Plug In, 2 A dc, 10 A ac
VND761,796.64