The AD thermal overload relay protects three-phase motors by disabling them through their contactor whenever it detects overload, phase loss, or phase imbalance. It is a mechanical thermal device built into the motor control circuit.

With an adjustable setting range from 12A to 18A, it covers motors rated from 4 to 7.5kW, making it suitable for pumps, compressors, fans, and industrial machinery.

Key Features

• Mechanical thermal overload protection for three-phase motors
• Adjustable trip current setting from 12A to 18A
• Designed for use with power relays from 4 to 7.5kW
• Triggers contactor disconnection on overload, phase loss, or phase imbalance
• Pairs with a matching contactor in a standard motor-starter assembly

Product Benefits

• Prevents motor burnout from sustained overcurrent conditions
• Detects phase imbalance and missing phase before windings are damaged
• Adjustable dial lets you fine-tune protection to the connected motor's nameplate
• Mechanical operation runs without auxiliary power supply
• Resettable design avoids replacement after a normal trip event

Technical Specifications

• Type: Thermal overload relay
• Operation: Mechanical
• Setting Range: 12-18A
• Motor Power Range: 4-7.5kW
• Protection: Overload, phase loss, phase imbalance
• Package Contents: 1x AD thermal overload relay 4-7.5kW / 12-18A

Why You'll Love It

• One relay covers a wide kW band for flexibility across motor types
• Standard motor-starter compatibility for use with common contactors
• Mechanical, power-free operation gives reliable protection in any panel
• Adjustable settings simplify spare-part stocking for service teams