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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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3RR2143-1AW30, Siemens
999997 In Stock
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£ 190.48
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3RU2126-1EC0, Siemens
999997 In Stock
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£ 63.25
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3RU19002AF71, Siemens
14 In Stock
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£ 26.73
3RB31134TB0, Siemens
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£ 95.95
3RB31234QB0, Siemens
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£ 107.78
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LRD3361, Schneider Electric
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£ 83.37
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£ 78.35
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£ 75.01
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LRD3353, Schneider Electric
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£ 64.64
Schneider Electric
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LR2D3559, Schneider Electric
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£ 159.54
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3RU1116-1KB0, Siemens
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£ 37.87
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£ 35.61
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£ 34.09
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3RU1116-1FB0, Siemens
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£ 34.09
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3RU19002AB71, Siemens
12 In Stock
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£ 22.71
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£ 21.35
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£ 20.44
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3RU19002AM71, Siemens
2 In Stock
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£ 22.71
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£ 21.35
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£ 20.44
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RS_136-3662, Siemens
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£ 34.82
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RS_136-3667, Siemens
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£ 34.82
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RS_136-3663, Siemens
9 In Stock
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£ 26.72
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RS_136-3674, Siemens
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£ 43.67
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RS_136-3680, Siemens
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£ 76.42
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RS_136-3654, Siemens
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£ 55.68
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RS_136-3679, Siemens
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£ 96.54
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RS_136-3651, Siemens
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£ 35.31
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RS_136-3677, Siemens
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£ 96.54
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RS_136-3675, Siemens
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£ 43.67
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RS_136-3657, Siemens
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£ 27.69
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RS_136-3661, Siemens
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RS_136-3669, Siemens
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3RH1131-1BC40, Siemens

3RH1131-1BC40, Siemens

Contactor Relays - 3RH1 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). Approvals UL listed / UL listed for Canada 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
ZB65-10, Eaton

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 )
New items
3RU11261GB0, Siemens

3RU11261GB0, Siemens

Overload Relays – 3RU11 Range Trip Class 10 Coil and auxiliary contact repeat terminals Trip fault indication Manual/auto reset Single phase differential protection Temperature compensated trip: -20°C to +60°C Note The width and height measurements of the overload relays are dependent on the contactor they are used on. Standards IEC947, VDE0990, EN60947 Approvals UL, CSA Warning This product is in obsolescence mode and is due for discontinuation by the manufacturer. We recommend that you review the alternative highlighted by the manufacturer. Alternatively, refer to the cross reference list in the Technical Reference section which highlights the upgrade path for your current generation of products.
New items
3RU11161KB0, Siemens

3RU11161KB0, Siemens

Overload Relays – 3RU11 Range Trip Class 10 Coil and auxiliary contact repeat terminals Trip fault indication Manual/auto reset Single phase differential protection Temperature compensated trip: -20°C to +60°C Note The width and height measurements of the overload relays are dependent on the contactor they are used on. Standards IEC947, VDE0990, EN60947 Approvals UL, CSA Warning This product is in obsolescence mode and is due for discontinuation by the manufacturer. We recommend that you review the alternative highlighted by the manufacturer. Alternatively, refer to the cross reference list in the Technical Reference section which highlights the upgrade path for your current generation of products.
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3RB2016-1RB0, Siemens

3RB2016-1RB0, Siemens

3RB20-series electronic overload relay Range of variants reduced thanks to large adjustment range Overload protection for three-phase motors On-site RESET is not necessary thanks to the automatic RESET function The 3RB20 cannot be used with DC current or behind frequency inverters Mechanically and electrically compatible with 3RT contactors and 3RW soft starters Internal power supply (no supply voltage required) Rapid triggering (With auxiliary contacts 1 N/O & 1 N/C, manual / automatic RESET, switch position indication, TEST function and STOP button Class 10; provides solutions for heavy start-up loads Power in kW (at 400 V) Adjustment range [A] Manuf. part no. Model size S00 with coil and auxiliary switch repeater terminal → 0.09 0.1 → 0.4 3RB2016-1RB0 Model size S0 1.1 → 5.5 3 to 12 3RB20261SB0 3 → 11 6 to 25 3RB20261QB0 Model size S2 7.5 → 22 13 → 50 3RB20361UB0 Electronic Overload Relays The 3RB2 range of Solid State Electronic overloads can be connected directly to Siemens SIRIUS contactors to provide accurate motor overload protection with enhanced single phase sensitivity,Application: Protection of 3 phase AC motors in sinusoidal 50/60Hz network. These relays are not suitable for the protection of single phase or DC loads,Select according to motor full load current and contactor frame size e,g. S00
New items
EF65-70, ABB

EF65-70, ABB

Electronic Overload Relay Electronic overload relays are the alternative to the thermal overload relays; they offer reliable and fast protection for motors in the event of overload or phase failure. Overload protection – trip class 10E, 20E, 30E selectable Phase loss sensitivity Adjustable current setting for overload protection Automatic or manual reset selectable Trip-free mechanism Status indication STOP and TEST function Sealable operating elements
New items
11RF95342, Lovato

11RF95342, Lovato

3-Pole Thermal Overload Relays 11 RF95 Manual resetting Direct mounting on BF50-BF110 contactors Lovato Orange Contactors, Control Relays and Accessories
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DILA-40(230V50HZ240V60HZ), Eaton

DILA-40(230V50HZ240V60HZ), Eaton

DILA Contactor Relay Current Rating 4A AC15 Note DILA -22 Contactor relay cannot be used with 4-pole auxiliary contact module.
New items
3RU1116-0FB0, Siemens

3RU1116-0FB0, Siemens

Overload Relays – 3RU11 Range Trip Class 10 Coil and auxiliary contact repeat terminals Trip fault indication Manual/auto reset Single phase differential protection Temperature compensated trip: -20°C to +60°C Note The width and height measurements of the overload relays are dependent on the contactor they are used on. Standards IEC947, VDE0990, EN60947 Approvals UL, CSA Warning This product is in obsolescence mode and is due for discontinuation by the manufacturer. We recommend that you review the alternative highlighted by the manufacturer. Alternatively, refer to the cross reference list in the Technical Reference section which highlights the upgrade path for your current generation of products.
New items
3RU11161EB0, Siemens

3RU11161EB0, Siemens

Overload Relays – 3RU11 Range Trip Class 10 Coil and auxiliary contact repeat terminals Trip fault indication Manual/auto reset Single phase differential protection Temperature compensated trip: -20°C to +60°C Note The width and height measurements of the overload relays are dependent on the contactor they are used on. Standards IEC947, VDE0990, EN60947 Approvals UL, CSA Warning This product is in obsolescence mode and is due for discontinuation by the manufacturer. We recommend that you review the alternative highlighted by the manufacturer. Alternatively, refer to the cross reference list in the Technical Reference section which highlights the upgrade path for your current generation of products.
New items
3RH1244-1AP00, Siemens

3RH1244-1AP00, Siemens

Contactor Relays - 3RH1 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). Approvals UL listed / UL listed for Canada 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. Warning This product is in obsolescence mode and is due for discontinuation by the manufacturer. We recommend that you review the alternative highlighted by the manufacturer. Alternatively, refer to the cross reference list in the Technical Reference section which highlights the upgrade path for your current generation of products.
New items
ZB12-12, Eaton

ZB12-12, Eaton

ZB Overload Relays Protects the motor against phase failure or overload Short circuit protection when fitted directly to a contact Suitable for protection of Atex motors Single phase sensitivity to IEC/EN 60947 When fitting overload relay remote from contactor or using more than one overload relay, use remote mounting base (stock no. 493-0488 - ZB32 only) Note ZB12 have 5 pins, ZB32 have 4 pins.
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