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Overload Relays
A thermal relay is a type of relay that protects a motor from overcurrent. It is called "thermal relay" because it operates after detecting a rise in the temperature of the motor coil. In some designs, the terminals are equipped with a cover to improve safety by protecting against electric shocks during maintenance or inspection. Most thermal relays are composed of a heater element and bi-metal section. When current flows through the heater element, the bi-metal section bends and the contacts open. If the relay is activated, eliminate the cause before restarting operation. Types include an automatic type that resets automatically after activation, and a manual type where the user resets the relay by pressing a button after the bi-metal has cooled. Because a thermal relay itself does not have a shut-off function, it is usually used in combination with an electromagnetic contactor.
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Specification/Dimensions
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Type
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Operating Method
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Motor capacity 400 to 440-VAC class(kW/A)
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Motor Capacity VAC 200–220 Class(kW/A)
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Coil rated voltage(V)
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Number of Poles
- 3
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Auxiliary Contact
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Representative Standard
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Dimension length(mm)
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Dimension width(mm)
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Dimension thickness(mm)
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Until 31/03/2025
Until 31/03/2025MITSUBISHI
Mitsubishi thermal relay TH-T series
[Features]
· Great satisfaction, condensed into a small unit.
· Further evolution of the Mitsubishi Electric electromagnetic switch.
· Can use to detect motor overload and locking current.
· Product lineup by application, including overload open-phase protection type, time-lagged type, quick operating type, etc.
[Applications]
· Motor burnout protection.From: ฿ 498.00 Special Price Days to Ship: 
Same day
Same day
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Until 31/03/2025
Until 31/03/2025New SC/NEO SC Series Thermal Relay
FUJI ELECTRIC
- Thermal Overload Relays New SC / NEO SC Series 2E type
- Part number for series including of TK-0N, TK-5-1N and TK-N
- Operating characteristics: The operating characteristics of a thermal overload relay represent its tripping time and response current starting from cold or hot state.
- Resistance to vibration and shock: The relays are tested to confirm that the items specified by JEM 1356 are satisfied.
- Switching reset: Automatic reset and Manual Reset
- current Auxiliary contact: 1NO+1NC.From: ฿ 625.00 Special Price Days to Ship:
Same day
Same day
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Until 31/03/2025
Until 31/03/2025MITSUBISHI
- TH-N Series Thermal Overload Relays.
- Operating characteristics: The operating characteristics of a thermal overload relay represent its tripping time and response current starting from cold or hot state.
- Rated Current Can Be Set Easily The value of the rated current is displayed on a dial. Simply adjust the dial to the full-load current of the motor and motor protection is assured.
- Auxiliary contact: 1NO+1NC
- Switching reset: Automatic reset and Manual Reset
- Can be tripped manually by turning in the display lever.
- Operation temperature: -25 to 55°CFrom: ฿ 1,550.00 Special Price Days to Ship:
Same day
Same day
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Until 31/03/2025
Until 31/03/2025MITSUBISHI
Mitsubishi electromagnetic switch.
[Features]
· Simple current setting, manual check possible.
[Applications]
· Optimal for the overload and locking protection of a standard motor.From: ฿ 5,060.00 Special Price Days to Ship:
Same day
Same day
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You can add up to 6 items per a category to the compare list.
FUJI ELECTRIC
[Features]
· Compliance and certification for major international standards (JIS, IEC, GB, UL, CSA)
· Terminal and dial covers are standard equipment
· Resettable type that can be easily switched between manual and automatic.
· Main terminals and auxiliary terminals are arranged in parallel to improve the wiring efficiency.From: ฿ 1,068.16 Days to Ship:
3 Day(s)
3 Day(s)
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You can add up to 6 items per a category to the compare list.
New SC / NEO SC Series Thermal Relay
FUJI ELECTRIC
- Thermal overload relays Quick operating type
- Part number for series including of TR-0NQ, TR-0NQH, TR-0NQH/A, TR-5-1NQ and TR-N3QH.
- Operating characteristics: The operating characteristics of a thermal overload relays represents its tripping time and response current starting from cold or hot state.
- Resistance to vibration and shock: The relays are tested to confirm that the items specified by JEM 1356 are satisfied.
- Auxiliary contact: 1NO+1NC
- Number of Poles: 3
- Switching reset: Automatic reset and Manual ResetFrom: ฿ 1,283.33 Days to Ship:
61 Day(s)
61 Day(s)
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You can add up to 6 items per a category to the compare list.
Until 31/03/2025
Until 31/03/2025MISUMI
- Thermal Relay for Mini Contact SMR series
- Part number for series including SMR-12, SMR-32, and SMR-63.
- Thermal Overload relays enhance electrical safety by monitoring motor currents. If currents exceed safe levels, the relay triggers protective actions, preventing motor overheating and potential fire hazards.
- current Auxiliary contact: 1NO+1NC.
- Certified Standards: CE
- Protection Class (IEC60529): IP20
- Rated Frequency: 50/ 60 Hz
- Switching reset: Automatic reset and Manual Reset
- Rated Current: 5 A.
- Operating Temperature Range: -25 to 55°CFrom: ฿ 451.94 Special Price Days to Ship:
Same day
Same day
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Thermal Relay for Mini Contact
MISUMI
- Thermal Relay for Mini Contact GTH series
- Part number for series including GTH-12M_.
- Thermal Overload relays enhance electrical safety by monitoring motor currents. If currents exceed safe levels, the relay triggers protective actions, preventing motor overheating and potential fire hazards.
- current Auxiliary contact: 1NO+1NC.
- Certified Standards: CE, CCC, UL, C-UL, and IEC.
- Rated Frequency: 50/ 60 Hz.
- Rated Setting Range (A): 0.1- 16 A.
- Switching reset: Automatic reset and Manual Reset
- Product for saving space.From: ฿ 375.41 Days to Ship:
Same day
Same day
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You can add up to 6 items per a category to the compare list.
New SC / NEO SC Series Time-Lag Type Thermal Relay
FUJI ELECTRIC
- Thermal Overload Relays New SC / NEO SC Series Long-time operating type
- Part number for series including of TR-0NLH, TR-5-1NLH and TR-N
- Operating characteristics: The operating characteristics of a thermal overload relay represent its tripping time and response current starting from cold or hot state.
- Resistance to vibration and shock: The relays are tested to confirm that the items specified by JEM 1356 are satisfied.
- Making and breaking capacity: Operational current 2 (A)
- Switching reset: Automatic reset and Manual ResetFrom: ฿ 2,883.33 Days to Ship:
61 Day(s)
61 Day(s)
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You can add up to 6 items per a category to the compare list.
New SC / NEO SC Series Thermal Relay with Quick Terminal TR-0NY Type
FUJI ELECTRIC
- Thermal Relay with Quick Terminal TR-0NY Type
- Part number for series including of TR-0NY_.
- Operating characteristics: The operating characteristics of a thermal overload relay represent its tripping time and response current starting from cold or hot state.
- Resistance to vibration and shock: The relays are tested to confirm that the items specified by JEM 1356 are satisfied.
- Auxiliary contact: 1NO+1NC
- Number of Poles: 3
- Switching reset: Automatic reset and Manual Reset
- UL File No. E44592From: ฿ 1,140.00 Days to Ship:
90 Day(s)
90 Day(s)
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You can add up to 6 items per a category to the compare list.
S Series Embedded Type Thermal Relay
FUJI ELECTRIC
[Features]
· It is optimum for surface control of the control center and for overload detection of transformer secondary side in high voltage receiving equipment.
· It can be embedded by one touch on the panel surface.
· You can adjust the setting current, trip, reset operation from the front.From: ฿ 3,821.67 Days to Ship:
90 Day(s)
90 Day(s)
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You can add up to 6 items per a category to the compare list.
ABB Thermal Overload Relays TF42 Series - 0.10 to 38.0 A
ABB
The TF42 thermal overload relays are economic electromechanical protection devices for the main circuit. They offer reliable protection for motors in the event of overload or phase failure. The devices have trip class 10.
The thermal overload relays are three pole relays with bimetal tripping elements. The motor current flows through the bimetal tripping elements and heats them directly and indirectly. In case of an overload (overcurrent), the bimetal elements bent as a result of the heating. This leads to a release of the relay and a change of the contacts switching position (95-96 / 97-98).
– Manual or automatic reset selectable
– Phase loss sensitive acc. to IEC/EN 60947-4-1
– TEST and STOP function – Trip indication on the front
– Temperature compensation
– Suitable for three- and single-phase applications
– With ATEX certificationFrom: ฿ 1,000.00 Days to Ship:
8 Day(s)
8 Day(s)
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You can add up to 6 items per a category to the compare list.
ABB Thermal Overload Relays TA200DU Series – 66 to 200 A
ABB
The TA200DU thermal overload relays are economic electromechanical protection devices for the main circuit. They offer reliable protection for motors in the event of overload or phase failure. The devices have trip class 10A.
The thermal overload relays are three pole relays with bimetal tripping elements. The motor current flows through the bimetal tripping elements and heats them directly and indirectly. In case of an overload (over current), the bimetal elements bent as a result of the heating. This leads to a release of the relay and a change of the contacts switching position (95-96 / 97-98).
• Manual or automatic reset selectable
• Phase loss sensitive acc. to IEC/EN 60947-4-1
• TEST and STOP function – Trip indication on the front
• Temperature compensation
• Suitable for three- and single-phase applications
• ATEX variants available.From: ฿ 6,283.33 Days to Ship:
8 Day(s)
8 Day(s)
-
You can add up to 6 items per a category to the compare list.
ABB Thermal Overload Relays TF140DU Series – 66 to 142 A
ABB
The TF140DU thermal overload relays are economic electromechanical protection devices for the main circuit. They offer reliable protection for motors in the event of overload or phase failure. The devices have trip class 10A.
The thermal overload relays are three pole relays with bimetal tripping elements. The motor current flows through the bimetal tripping elements and heats them directly and indirectly. In case of an overload (over current), the bimetal elements bent as a result of the heating. This leads to a release of the relay and a change of the contacts switching position (95-96 / 97-98).
• Manual or automatic reset selectable
• Phase loss sensitive acc. to IEC/EN 60947-4-1
• TEST and STOP function – Trip indication on the front
• Temperature compensation
• Suitable for three- and single-phase applications
• ATEX variants available.From: ฿ 4,333.33 Days to Ship:
8 Day(s)
8 Day(s)
-
You can add up to 6 items per a category to the compare list.
ABB Thermal Overload Relays TF65 Series - 22.0 to 67.0 A
ABB
The TF65 thermal overload relays are economic electromechanical protection devices for the main circuit. They offer reliable protection for motors in the event of overload or phase failure. The devices have trip class 10.
The thermal overload relays are three pole relays with bimetal tripping elements. The motor current flows through the bimetal tripping elements and heats them directly and indirectly. In case of an overload (over current), the bimetal elements bent as a result of the heating. This leads to a release of the relay and a change of the contacts switching position (95-96 / 97-98).
– Manual or automatic reset selectable
– Phase loss sensitive acc. to IEC/EN 60947-4-1
– TEST and STOP function – Trip indication on the front
– Temperature compensation
– Suitable for three- and single-phase applications
– With ATEX certification 1)
1) ATEX is valid for products, produced from week 26, 2015
2) Note: for more information see catalog 1SFC151004C0201From: ฿ 2,133.33 Days to Ship:
8 Day(s)
8 Day(s)
-
You can add up to 6 items per a category to the compare list.
ABB Thermal Overload Relays TF96 Series - 40.0 to 96.0 A
ABB
The TF96 thermal overload relays are economic electromechanical protection devices for the main circuit.
They offer reliable protection for motors in the event of overload or phase failure. The devices have trip class 10.
The thermal overload relays are three pole relays with bimetal tripping elements. The motor current flows through the bimetal tripping elements and heats them directly and indirectly. In case of an overload (over current), the bimetal elements bent as a result of the heating. This leads to a release of the relay and a change of the contacts switching position (95-96 / 97-98).
– Manual or automatic reset selectable
– Phase loss sensitive acc. to IEC/EN 60947-4-1
– TEST and STOP function – Trip indication on the front
– Temperature compensation
– Suitable for three- and single-phase applications
– With ATEX certification 1)
1) ATEX is valid for products, produced from week 26, 2015
2) Note: for more information see catalog 1SFC151004C0201From: ฿ 2,950.00 Days to Ship:
8 Day(s)
8 Day(s)
| Brand |
|---|
| Product Series |
| CAD |
| From |
| Days to Ship |
| Specifications |
| Type |
| Operating Method |
| Motor capacity 400 to 440-VAC class(kW/A) |
| Motor Capacity VAC 200–220 Class(kW/A) |
| Coil rated voltage(V) |
| Number of Poles |
| Auxiliary Contact |
| Representative Standard |
| Dimension length(mm) |
| Dimension width(mm) |
| Dimension thickness(mm) |
You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  Until 31/03/2025 | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | You can add up to 6 items per a category to the compare list.  | |
| Brand | MITSUBISHI | FUJI ELECTRIC | MITSUBISHI | MITSUBISHI | FUJI ELECTRIC | FUJI ELECTRIC | MISUMI | MISUMI | FUJI ELECTRIC | FUJI ELECTRIC | FUJI ELECTRIC | ABB | ABB | ABB | ABB | ABB |
| Product Series | New SC / NEO SC Series Thermal Relay with Quick Terminal TR-0NY Type | |||||||||||||||
| CAD |
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| From | ฿ 498.00 Special Price On Sale Until 31/03/2025 | ฿ 625.00 Special Price On Sale Until 31/03/2025 | ฿ 1,550.00 Special Price On Sale Until 31/03/2025 | ฿ 5,060.00 Special Price On Sale Until 31/03/2025 | ฿ 1,068.16 | ฿ 1,283.33 | ฿ 451.94 Special Price On Sale Until 31/03/2025 | ฿ 375.41 | ฿ 2,883.33 | ฿ 1,140.00 | ฿ 3,821.67 | ฿ 1,000.00 | ฿ 6,283.33 | ฿ 4,333.33 | ฿ 2,133.33 | ฿ 2,950.00 |
| Days to Ship | Same day | Same day | Same day | Same day | 3 Day(s) | 61 Day(s) | Same day | Same day | 61 Day(s) | 90 Day(s) | 90 Day(s) | 8 Day(s) | 8 Day(s) | 8 Day(s) | 8 Day(s) | 8 Day(s) |
| Specifications | ||||||||||||||||
| Type | - | - | - | - | - | Thermal relay | - | - | Thermal relay | Thermal relay | Thermal relay | - | - | - | - | - |
| Operating Method | - | - | - | - | Other | Irreversible type | - | - | Irreversible type | Irreversible type | Irreversible type | - | - | - | - | - |
| Motor capacity 400 to 440-VAC class(kW/A) | 0.2 ～ 0.4 | - | 45/82 ～ 200/330 | 45/82 ～ 200/330 | - | - | - | - | - | - | - | - | - | - | - | - |
| Motor Capacity VAC 200–220 Class(kW/A) | - | - | 22/82 ～ 110/330 | 22/82 ～ 110/330 | - | - | 0.05/0.52 ～ 15/55 | - | - | - | - | - | - | - | - | - |
| Coil rated voltage(V) | 690 | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
| Number of Poles | - | 3 | 3 | 3 | - | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Auxiliary Contact | 1a1b | 1a1b | 1a1b | 1a1b | - | 1a1b | 1a1b | 1a1b | 1a1b | 1a1b | Other | 1a1b | 1a1b | 1a1b | 1a1b | 1a1b |
| Representative Standard | CE / CUL / TUV / CCC | CE / UL / CUL / TUV / CCC / CSA | CCC | - | UL / CSA | CCC | CE | CE | - | - | - | - | - | - | - | - |
| Dimension length(mm) | 51 ～ 73.5 | 77 ～ 183 | 112 ～ 144 | 144 | - | 80 ～ 111 | 73.2 ～ 80.6 | 73.2 | 91.5 ～ 149 | 81 | 76 | 70.5 | 126 | 126 | 106.9 | 106.3 |
| Dimension width(mm) | 45 ～ 89 | 44 ～ 197 | 87 ～ 160 | 104 ～ 173 | 45 | 44 ～ 68 | 45 ～ 55 | 45 | 83.5 ～ 149 | 44 | 70 | 45 | 104 | 89 | 54.9 | 69.9 |
| Dimension thickness(mm) | 76.5 ～ 83.5 | 58.5 ～ 182 | 105 ～ 193 | 166.5 | - | 59.5 ～ 109.5 | 63.7 ～ 100 | 63.7 | 100 ～ 158.5 | 59 | 88.3 | 88.3 | 151 | 140 | 101.4 | 106.9 |
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Related Categories to Overload Relays
FAQ Overload Relays
- Question: What is the purpose of terminals 95 and 96 on an overload relay?
- Answer: In electrical systems, terminals 95 and 96 on an overload relay serve a crucial role in motor protection. Terminal 95 is the common terminal for the trip circuit, and terminal 96 is the normally close contact. When the overload relay detects excessive current in a motor, it activates the trip circuit. This action causes the normally close contact at terminal 96 to open, initiating protective measures, such as disconnecting the motor from the power supply, to prevent damage due to overcurrent.
- Question: How do overload relays contribute to electrical safety?
- Answer: Overload relays enhance electrical safety by monitoring motor currents. If currents exceed safe levels, the relay triggers protective actions, preventing motor overheating and potential fire hazards. By swiftly disconnecting power during overloads, they safeguard equipment, reduce downtime, and comply with safety standards. Overload relays offer early warnings of issues, allowing for timely maintenance. Customizable to specific current limits, they contribute to adaptability and seamless integration with control systems, ensuring efficient protection and reliable operation in various electrical applications.
- Question: What factors determine the correct setting for an overload relay?
- Answer: The correct overload relay setting depends on factors such as motor rating, type, and efficiency. Considerations include inrush current during startup, operating conditions, and load variations. Crucial aspects involve service factors, thermal models, and adherence to standards. Following manufacturer recommendations, finding a balance between protection sensitivity and avoiding unnecessary tripping is key. Regular reviews accommodate changes in the electrical system or equipment, ensuring optimal protection, compliance with standards, and reliability across various applications.
- Question: What role does an overload relay play in a 3-phase system?
- Answer: In a 3-phase system, an overload relay protects electric motors by monitoring current. When it detects excess current, signaling an overload, the relay activates a trip circuit that rapidly disconnects the motor. This prevents overheating, safeguarding the motor from damage and mitigating fire hazards. The overload relay contributes to overall system reliability, with adjustable settings and integration capabilities enhancing its adaptability and automation in motor protection.
- Question: How can the principle of overload be beneficial in relay design?
- Answer: The principle of overload in relay design is pivotal for electrical system safety. Overload relays, responsive to excessive current, disconnect power swiftly, preventing equipment damage and fire hazards. Adjustable settings accommodate diverse motor requirements, ensuring adaptability. Early warning features facilitate timely maintenance, minimizing downtime. This principle aligns with safety standards, promoting compliance. Beyond protection, overload relays contribute to energy efficiency by optimizing motor performance under varying loads. Overall, they play a crucial role in enhancing equipment longevity, system reliability, and adherence to safety regulations in electrical systems.
- Question: What distinguishes bimetallic overload relays from electronic types?
- Answer: Bimetallic and electronic overload relays differ in technology and performance. Bimetallic relays use physical expansion of bimetallic strips for current detection, providing simplicity but less precision. Electronic relays, employing sensors and microprocessors, offer higher sensitivity, adjustability, and advanced motor protection. While bimetallic relays are cost-effective for basic applications, electronic relays excel in complex systems, delivering enhanced performance, adaptability, and reliability. The choice depends on the application's needs, with bimetallic relays suited for simplicity and electronic relays for advanced functionality.
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