Overloads for DOL Starters

Showing all 10 results

Axiom Thermal Overload Relay 1.4 – 2.2A

Delivery Usually 3-4 Working Days

SKU: THR131.8

£12.50 £15.00

Axiom Thermal Overload Relay 12 – 18A

5 In stock

More Available within 2-3 Days

SKU: THR3315

£18.25 £21.90

Axiom Thermal Overload Relay 2.2 – 3.4A

Delivery Usually 3-4 Working Days

SKU: THR132.8

£12.50 £15.00

Axiom Thermal Overload Relay 2.8 – 4.2A

1 In stock

More Available within 2-3 Days

SKU: THR133.6

£12.50 £15.00

Axiom Thermal Overload Relay 20 – 26A

Delivery Usually 3-4 Working Days

SKU: THR3323

£18.25 £21.90

Axiom Thermal Overload Relay 28 – 38A

Delivery Usually 3-4 Working Days

SKU: THR3333

£18.25 £21.90

Axiom Thermal Overload Relay 32 – 48A

Delivery Usually 3-4 Working Days

SKU: THR3340

£18.50 £22.20

Axiom Thermal Overload Relay 4 – 6A

3 In stock

More Available within 2-3 Days

SKU: THR135

£12.50 £15.00

Axiom Thermal Overload Relay 5 – 8A

Delivery Usually 3-4 Working Days

SKU: THR136.5

£12.50 £15.00

Axion Thermal Overload Relay 0.8-1.2A

Delivery Usually 3-4 Working Days

SKU: THR131

£11.95 £14.34

Showing all 10 results

Overloads for Direct-On-Line (DOL) starters are protective devices used to monitor the current drawn by an electric motor during operation. They are an essential component of a DOL starter and serve the crucial role of protecting the motor from overheating and damage caused by excessive current. Here are some key points to understand about overloads for DOL starters:

Purpose: The primary purpose of overloads in a DOL starter is to protect the motor from excessive current that can result from overloads, faults, or other abnormal conditions. Overheating can lead to motor damage and reduced motor life.
Operation: Overloads are typically implemented using thermal overload relays. These relays are connected in series with the motor circuit. They contain heating elements that respond to the current passing through them. When the current exceeds a preset threshold for an extended period, the heating element heats up and causes the relay to trip. This action de-energizes the contactor, disconnecting power to the motor and stopping it.
Adjustable Settings: Overload relays often allow for adjustment of the current trip threshold. This adjustment is typically based on the motor’s rated current and the level of overload protection required. Properly setting the overload protection ensures that the motor is protected without unnecessary tripping.
Resetting: After a thermal overload relay trips due to an overload condition, it requires manual resetting. This safety feature ensures that the cause of the overload is addressed before the motor is restarted.
Sensitivity to Motor Conditions: Overloads are sensitive to the motor’s current draw and can detect issues such as motor overloads, locked rotors, or blocked loads. This sensitivity allows for early detection of problems that could lead to motor damage.
Coordination with DOL Starter: The overload relay must be properly coordinated with the DOL starter’s contactor. When an overload condition occurs, the relay must de-energize the contactor quickly to protect the motor effectively.
Wiring and Connection: Proper wiring and connection of the overload relay are essential to ensure accurate monitoring of motor current. The overload relay should be connected in series with the motor circuit as per the manufacturer’s instructions and wiring diagrams.
Testing and Verification: Overload relays should be tested and verified to ensure they function correctly and provide the necessary motor protection. Regular testing and maintenance are recommended to ensure continued reliability.
Documentation: Proper documentation of the overload relay’s settings, ratings, and test results should be maintained for reference and compliance with electrical regulations.

Overloads in DOL starters are a critical safety feature, providing motor protection against overheating and damage due to excessive current. Proper selection, installation, and maintenance of overload relays are essential to ensure the safe and reliable operation of electric motors in various industrial and commercial applications.

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