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Thermal Relays

Thermal relays, also known as overload relays or thermal overload protection devices, are essential components in motor control circuits. These electromechanical devices protect electric motors from damage caused by prolonged overcurrent conditions, typically using a bimetallic strip that bends when heated by the motor current, tripping the cont...

Thermal relays, also known as overload relays or thermal overload protection devices, are essential components in motor control circuits. These electromechanical devices protect electric motors from damage caused by prolonged overcurrent conditions, typically using a bimetallic strip that bends when heated by the motor current, tripping the contactor and disconnecting the motor. Key technical parameters include the setting current range (e.g., 0.1-630A), trip class (Class 10, 20, or 30), and the number of poles (typically 3P for three-phase motors). They are available in direct-mounted or separate-mounted configurations, often with differential mechanism for single-phase protection and ambient temperature compensation. Common accessories include auxiliary contact blocks, manual/automatic reset selectors, and test buttons.

Thermal relays are primarily installed in motor control centers (MCCs), distribution boards, and industrial automation panels. They are widely used across sectors such as manufacturing, water treatment, HVAC, mining, and oil and gas, where electric motors drive pumps, fans, conveyors, compressors, and other rotating machinery. Their robust design ensures reliable protection in harsh environments, with IP20 or higher protection ratings depending on the enclosure.

Our catalog includes subcategories like direct-mounted thermal relays (e.g., for contactors up to 95A), separate-mounted thermal relays (for higher currents up to 630A), and electronic overload relays with advanced features. Key article codes follow patterns such as "LRD" for TeSys series (e.g., LRD06, LRD22) or "3RU" for Siemens Sirius (e.g., 3RU2116, 3RU2136), where the numeric suffix indicates the setting range. These codes are standardized across manufacturers, making selection straightforward based on motor full-load current and contactor frame size.

At Electric Automation Network, we offer express worldwide shipping and personalized technical support from our team of specialized engineers. We provide real-time pricing, detailed technical documentation for each article, and expert advice to help you select the correct thermal relay for your motor protection needs. Our multilingual portal ensures seamless procurement across borders, with discounts up to 65% compared to list prices.

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Manufacturer Code Reference Catalog Number Description Delivery Price

1SAZ801901R1001

1SAZ801901R1001

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DB65 Single Mounting Kit

DB65 IND ASSEMBLY KIT. EF65 and TF65

DB65 Single Mounting Kit

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1SAZ701903R1011

1SAZ701903R1011

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WRB-400 Bowden Wire

WRB-400 RESET CABLE 400 mm TF/EF RELAYS

WRB-400 Bowden Wire

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1SAZ701903R1012

1SAZ701903R1012

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WRB-600 Bowden Wire

WRB-600 RESET CABLE 600 mm TF/EF RELAYS

WRB-600 Bowden Wire

 		2 View Availability View Price

1SAZ721201R1005

1SAZ721201R1005

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TF42-0.13 Thermal Overload Relay

TF42-0.13 RELe TeRM CLASS 10, 0.10-0.13

TF42-0.13 Thermal Overload Relay 0.10 ... 0.13 A

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1SAZ721201R1008

1SAZ721201R1008

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TF42-0.17 Thermal Overload Relay

TF42-0.17 RELe TeRM CLASS 10, 0.13-0.17

TF42-0.17 Thermal Overload Relay 0.13 ... 0.17 A

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1SAZ721201R1009

1SAZ721201R1009

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TF42-0.23 Thermal Overload Relay

TF42-0.23 RELe TeRM CLASS 10, 0.17-0.23

TF42-0.23 Thermal Overload Relay 0.17 ... 0.23 A

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1SAZ721201R1013

1SAZ721201R1013

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TF42-0.31 Thermal Overload Relay

TF42-0.31 RELe TeRM CLASS 10, 0.23-0.31

TF42-0.31 Thermal Overload Relay 0.23 ... 0.31 A

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1SAZ721201R1014

1SAZ721201R1014

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TF42-0.41 Thermal Overload Relay

TF42-0.41 RELe TeRM CLASS 10, 0.31-0.41

TF42-0.41 Thermal Overload Relay 0.31 ... 0.41 A

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1SAZ721201R1017

1SAZ721201R1017

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TF42-0.55 Thermal Overload Relay

TF42-0.55 RELe TeRM CLASS 10, 0.41-0.55

TF42-0.55 Thermal Overload Relay 0.41 ... 0.55 A

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1SAZ721201R1021

1SAZ721201R1021

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TF42-0.74 Thermal Overload Relay

TF42-0.74 RELe TeRM CLASS 10, 0.55-0.74

TF42-0.74 Thermal Overload Relay 0.55 ... 0.74 A

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1SAZ721201R1023

1SAZ721201R1023

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TF42-1.0 Thermal Overload Relay

TF42-1.0 RELe TeRM CLASS 10, 0.74-1.00 A

TF42-1.0 Thermal Overload Relay 0.74 ... 1.0 A

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1SAZ721201R1025

1SAZ721201R1025

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TF42-1.3 Thermal Overload Relay

TF42-1.3 RELe TeRM CLASS 10, 1.00-1.30 A

TF42-1.3 Thermal Overload Relay 1.0 ... 1.3 A

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1SAZ721201R1028

1SAZ721201R1028

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TF42-1.7 Thermal Overload Relay

TF42-1.7 RELe TeRM CLASS 10, 1.30-1.70 A

TF42-1.7 Thermal Overload Relay 1.3 ... 1.7 A

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1SAZ721201R1043

1SAZ721201R1043

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TF42-10 Thermal Overload Relay

TF42-10 RELe TeRM CLASS 10, 7.60-10.0 A

TF42-10 Thermal Overload Relay 7.6 ... 10 A

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1SAZ721201R1031

1SAZ721201R1031

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TF42-2.3 Thermal Overload Relay

TF42-2.3 RELe TeRM CLASS 10, 1.70-2.30 A

TF42-2.3 Thermal Overload Relay 1.7 ... 2.3 A

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1SAZ721201R1033

1SAZ721201R1033

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TF42-3.1 Thermal Overload Relay

TF42-3.1 RELe TeRM CLASS 10, 2.30-3.10 A

TF42-3.1 Thermal Overload Relay 2.3 ... 3.1 A

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1SAZ721201R1035

1SAZ721201R1035

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TF42-4.2 Thermal Overload Relay

TF42-4.2 RELe TeRM CLASS 10, 3.10-4.20 A

TF42-4.2 Thermal Overload Relay 3.1 ... 4.2 A

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1SAZ721201R1038

1SAZ721201R1038

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TF42-5.7 Thermal Overload Relay

TF42-5.7 RELe TeRM CLASS 10, 4.20-5.70 A

TF42-5.7 Thermal Overload Relay 4.2 ... 5.7 A

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1SAZ721201R1040

1SAZ721201R1040

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TF42-7.6 Thermal Overload Relay

TF42-7.6 RELe TeRM CLASS 10, 5.70-7.60 A

TF42-7.6 Thermal Overload Relay 5.7 ... 7.6 A

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1SAZ721201R1049

1SAZ721201R1049

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TF42-20 Thermal Overload Relay

TF42-20 RELe TeRM CLASS 10, 16.0-20.0 A

TF42-20 Thermal Overload Relay 16 ... 20 A

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1SAZ721201R1045

1SAZ721201R1045

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TF42-13 Thermal Overload Relay

TF42-13 RELe TeRM CLASS 10, 10.0-13.0 A

TF42-13 Thermal Overload Relay 10 ... 13 A

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1SAZ721201R1047

1SAZ721201R1047

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TF42-16 Thermal Overload Relay

TF42-16 RELe TeRM CLASS 10, 13.0-16.0 A

TF42-16 Thermal Overload Relay 13 ... 16 A

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1SAZ701903R1013

1SAZ701903R1013

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WRB-1000 Bowden Wire

WRB-1000 RESET CABLE 1m TF/EF RELAYS

WRB-1000 Bowden Wire

 		3 View Availability View Price

1SAZ721201R1051

1SAZ721201R1051

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TF42-24 Thermal Overload Relay

TF42-24 RELe TeRM CLASS 10, 20.0-24.0 A

TF42-24 Thermal Overload Relay 20 ... 24 A

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1SAZ721201R1052

1SAZ721201R1052

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TF42-29 Thermal Overload Relay

TF42-29 RELe TeRM CLASS 10, 24.0-29.0 A

TF42-29 Thermal Overload Relay 24 ... 29 A

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1SAZ901901R1001

1SAZ901901R1001

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DB96 Single Mounting Kit

DB96 IND ASSEMBLY KIT. EF96 and TF96

DB96 Single Mounting Kit

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1SAZ401110R0001

1SAZ401110R0001

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DB200 Single Mounting Kit

DB200 ACCES. FIJAC. INDEP. FOR TA110DU

DB200 Single Mounting Kit

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1SAZ721201R1053

1SAZ721201R1053

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TF42-35 Thermal Overload Relay

TF42-35 RELe TeRM CLASS 10, 29.0-35.0 A

TF42-35 Thermal Overload Relay 29 ... 35 A

 		2 View Availability View Price

1SAZ721201R1055

1SAZ721201R1055

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TF42-38 Thermal Overload Relay

TF42-38 RELe TeRM CLASS 10, 35.0-38.0/40

TF42-38 Thermal Overload Relay 35 ... 38 A

 		2 View Availability View Price

1SAZ811201R1001

1SAZ811201R1001

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TF65-28 Thermal Overload Relay

TF65-28 THERMAL OVERLOAD RELAY 22-28A

TF65-28 Thermal Overload Relay 22 ... 28 A

 		2 View Availability View Price

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