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Showing Results For: Contactor & Control Relay Overloads

Contactor & Control Relay Overloads

Contactor and control relay overloads are essential components in electrical systems that protect motors and other devices from damage due to overheating. These devices work in tandem to ensure that electrical circuits are safe and efficient. 

Contactor Overloads:

A contactor overload is a protective device to safeguard motors against damage caused by overheating. It measures the current flowing through the motor and interrupts the circuit if the current exceeds a predetermined value. A contactor overload typically comprises a bimetallic strip that heats-up when current flows through it, causing it to bend and trigger the overload relay. Contactor overloads are available in various sizes and ratings and can be either adjustable or non-adjustable.

Control Relay Overloads:

Control relay overloads are similar to contactor overloads in function and design but are used in different parts of the electrical system. They protect control circuits, such as those used in lighting or heating and cooling systems. Control relay overloads operate by sensing the current flowing through the circuit and breaking the circuit if the current exceeds a certain level. Control relay overloads are available in various sizes and ratings and can be either adjustable or non-adjustable.

Types of Overloads:

There are two types of overloads: thermal and electronic. Thermal overloads use bimetallic strips that heat up when current flows through them, causing them to bend and trigger the overload relay. Electronic overloads use sensors to detect changes in current flow and interrupt the circuit if the current exceeds a predetermined level.

Applications of Overloads:

Overloads are commonly used in industrial applications, such as manufacturing plants or extensive facilities where motors are used extensively. They are also used in HVAC systems, water treatment plants, and other facilities requiring precise control. Overloads are essential components in electrical systems, providing an extra layer of protection against damage and ensuring equipment runs efficiently.

Contactor and control relay overloads are essential components in electrical systems that protect motors and other devices from damage due to overheating. They come in various sizes and ratings and can be either adjustable or non-adjustable. There are two types of overloads: thermal and electronic, and they are commonly used in industrial applications, HVAC systems, water treatment plants, and other facilities where precise control is required. Proper selection and installation of overloads are critical for the safety and efficiency of electrical systems.


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276364 | DILA-31(230V50HZ,240V60HZ), Eaton
1 In Stock
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£ 39.60
278460 | ZB65-65, Eaton
3 In Stock
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£ 114.26
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£ 107.41
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£ 102.81
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278454 | ZB32-32, Eaton
4 In Stock
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£ 82.40
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£ 77.41
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£ 74.14
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278447 | ZB32-1,6, Eaton
24 In Stock
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£ 47.14
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278435 | ZB12-1, Eaton
2 In Stock
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£ 39.45
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276361 | DILA-31(110V50HZ,120V60HZ), Eaton
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278448 | ZB32-2,4, Eaton
4 In Stock
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£ 47.14
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276414 | DILA-22(24VDC), Eaton
23 In Stock
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£ 32.89
278458 | ZB65-40, Eaton
7 In Stock
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£ 55.35
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276344 | DILA-40(24VDC), Eaton
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276316 | DILA-40(24V50HZ), Eaton
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£ 27.78
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276379 | DILA-31(24VDC), Eaton
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276399 | DILA-22(230V50HZ,240V60HZ), Eaton
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278450 | ZB32-6, Eaton
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£ 33.91
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276351 | DILA-31(24V50HZ), Eaton
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278437 | ZB12-2,4, Eaton
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£ 29.61
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278446 | ZB32-1, Eaton
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276386 | DILA-22(24V50HZ), Eaton
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276329 | DILA-40(230V50HZ,240V60HZ), Eaton
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278440 | ZB12-10, Eaton
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278439 | ZB12-6, Eaton
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278449 | ZB32-4, Eaton
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278459 | ZB65-57, Eaton
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276396 | DILA-22(110V50HZ,120V60HZ), Eaton
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278441 | ZB12-12, Eaton
21 In Stock
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New Items
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278455 | ZB65-10, Eaton

278455 | ZB65-10, Eaton

ZB65 Overload Relays These are for use with DILM contactors DILM40 to DILM65 Fits below DILM 40 to DILM65 contactors Provides short circuit protection for motors When fitting overload relay remote from contactor, or using more than one overload relay, use remote mounting base (stock no. 513-0336 )
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051756 | DILER-40(110V50HZ,120V60HZ), Eaton

051756 | DILER-40(110V50HZ,120V60HZ), Eaton

DILER Mini Contactor Relay a.c only or dc only operated coils 10A contact rating with protection Surface or DIN rail mounting 500V a.c./250V d.c. maximum rating voltage Dimensions HxWXD 58 x 45 x 52 mm
New items
RS_136-3662, Siemens

RS_136-3662, Siemens

Contactor Relays - 3RH2 Range Climate-proof, finger safe contactor relays. RC elements, varistors, diodes or diode assemblies (combination of a diode and a Zener diode) can be plugged onto all contactor relays for damping opening surges in the coil. Size S00 High degree if contact stability at low voltages & current Suitable for use with solid-state circuits with currents ≥ 1 mA at a voltage of ≥ 17 V Capable of expansion by up to four contacts through use of snap-on auxiliary switch blocks Note The OFF-delay of the NO contact and the ON-delay of the NC contact are increased if the contactor coils are attenuated against voltage peaks (noise suppression diode 6 to 10 times; diode assemblies 2 to 6 times, varistor +2 to 5 ms). Standards IEC 60947-1, EN 60947-1, IEC 60947-4-1, EN 60947-4-1, IEC 60947-5-1, EN 60947-5-1. Siemens Sirius Range Contactor & Control Relays Siemens control gear for feeders up to 5.5kW. The complementary nature of the devices allows fast and simple assembly, for example, of motor starters and reversers. A perfect match between contactors, overloads, circuit breakers and accessories for the same power ratings provides a uniform panel appearance and the standard widths with no side-by-side mounting derating allows for space saving.
New items
RS_136-3667, Siemens

RS_136-3667, Siemens

Contactor Relays - 3RH2 Range Climate-proof, finger safe contactor relays. RC elements, varistors, diodes or diode assemblies (combination of a diode and a Zener diode) can be plugged onto all contactor relays for damping opening surges in the coil. Size S00 High degree if contact stability at low voltages & current Suitable for use with solid-state circuits with currents ≥ 1 mA at a voltage of ≥ 17 V Capable of expansion by up to four contacts through use of snap-on auxiliary switch blocks Note The OFF-delay of the NO contact and the ON-delay of the NC contact are increased if the contactor coils are attenuated against voltage peaks (noise suppression diode 6 to 10 times; diode assemblies 2 to 6 times, varistor +2 to 5 ms). Standards IEC 60947-1, EN 60947-1, IEC 60947-4-1, EN 60947-4-1, IEC 60947-5-1, EN 60947-5-1. Siemens Sirius Range Contactor & Control Relays Siemens control gear for feeders up to 5.5kW. The complementary nature of the devices allows fast and simple assembly, for example, of motor starters and reversers. A perfect match between contactors, overloads, circuit breakers and accessories for the same power ratings provides a uniform panel appearance and the standard widths with no side-by-side mounting derating allows for space saving.
New items
276364 | DILA-31(230V50HZ,240V60HZ), Eaton

276364 | DILA-31(230V50HZ,240V60HZ), Eaton

DILA Contactor Relay Current Rating 4A AC15 Note DILA -22 Contactor relay cannot be used with 4-pole auxiliary contact module.
New items
010223 | DILER-40-G(24VDC), Eaton

010223 | DILER-40-G(24VDC), Eaton

DILER Mini Contactor Relay a.c only or dc only operated coils 10A contact rating with protection Surface or DIN rail mounting 500V a.c./250V d.c. maximum rating voltage Dimensions HxWXD 58 x 45 x 52 mm
New items
051774 | DILER-22(110V50HZ,120V60HZ), Eaton

051774 | DILER-22(110V50HZ,120V60HZ), Eaton

DILER Mini Contactor Relay a.c only or dc only operated coils 10A contact rating with protection Surface or DIN rail mounting 500V a.c./250V d.c. maximum rating voltage Dimensions HxWXD 58 x 45 x 52 mm
New items
278460 | ZB65-65, Eaton

278460 | ZB65-65, Eaton

ZB65 Overload Relays These are for use with DILM contactors DILM40 to DILM65 Fits below DILM 40 to DILM65 contactors Provides short circuit protection for motors When fitting overload relay remote from contactor, or using more than one overload relay, use remote mounting base (stock no. 513-0336 )
New items
RS_136-3663, Siemens

RS_136-3663, Siemens

Contactor Relays - 3RH2 Range Climate-proof, finger safe contactor relays. RC elements, varistors, diodes or diode assemblies (combination of a diode and a Zener diode) can be plugged onto all contactor relays for damping opening surges in the coil. Size S00 High degree if contact stability at low voltages & current Suitable for use with solid-state circuits with currents ≥ 1 mA at a voltage of ≥ 17 V Capable of expansion by up to four contacts through use of snap-on auxiliary switch blocks Note The OFF-delay of the NO contact and the ON-delay of the NC contact are increased if the contactor coils are attenuated against voltage peaks (noise suppression diode 6 to 10 times; diode assemblies 2 to 6 times, varistor +2 to 5 ms). Standards IEC 60947-1, EN 60947-1, IEC 60947-4-1, EN 60947-4-1, IEC 60947-5-1, EN 60947-5-1. Siemens Sirius Range Contactor & Control Relays Siemens control gear for feeders up to 5.5kW. The complementary nature of the devices allows fast and simple assembly, for example, of motor starters and reversers. A perfect match between contactors, overloads, circuit breakers and accessories for the same power ratings provides a uniform panel appearance and the standard widths with no side-by-side mounting derating allows for space saving.
New items
E16DU2.7, ABB

E16DU2.7, ABB

Overload Relay ABB E16 electronic overload relay featuring a direct coupling connection type DIN Rail mount Screw terminal ABB E16 Series
New items
11RF95365, Lovato

11RF95365, Lovato

3-Pole Thermal Overload Relays 11 RF95 Manual resetting Direct mounting on BF50-BF110 contactors Lovato Orange Contactors, Control Relays and Accessories
New items
1SAZ111301R0001, ABB

1SAZ111301R0001, ABB

T19 - Thermal Overload Relay For miniature contactors B6, B7, BC6, BC7 For compact reversing contactors VB6, VB7 Mounts directly onto contactor Two integrated auxiliary switches (1 N/O / 1 N/C) Selection guide Stock no. Manuf. part no. Setting range [A] 445-7595 1SAZ 111 301 R 0001 0.1 to 0.16 445-7602 1SAZ 111 301 R 0002 0.16 to 0.24 445-7618 1SAZ 111 301 R 0003 0.24 to 0.4 445-7630 1SAZ 111 301 R 0004 0.4 to 0.6 445-7646 1SAZ 111 301 R 0005 0.6 to 1.0 445-7652 1SAZ 111 301 R 0006 1.0 to 1.6 445-7668 1SAZ 111 301 R 0007 1.6 to 2.4 445-7674 1SAZ 111 301 R 0008 2.4 to 4.0 445-7589 1SAZ 111 301 R 0009 4.0 to 6.0 445-7680 1SAZ 111 301 R 0010 6.0 to 9.0 445-7696 1SAZ 111 301 R 0011 9.0 to 12.0 Technical specifications Release class: 10 Ambient temperature: -25°C to +55°C Approvals CSA, UL, ATEX
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