IMO OL10D Thermal Overload Relay – 14.0A to 20.0A Motor Protection Module

This is the IMO OL10D Thermal Overload Relay – a 14.0A to 20.0A Motor Protection Module available at SparksDirect for the best price. Purchase this item with confidence at Sparks today.

The IMO OL10D is a thermal overload relay designed to protect AC motors from damage caused by overheating. It is a "plug-in" module that mounts directly to the underside of a contactor, monitoring the current flow and tripping the circuit if it detects a prolonged overcurrent or a phase failure. The IMO OL10D provides essential electromechanical protection for industrial motors. It utilizes a sensitive bimetallic mechanism that reacts to the heat generated by electrical current; if the current exceeds the user-defined limit for a specific duration, the relay trips to prevent the motor windings from burning out.

This specific model features an adjustable setting range of 14.0A to 20.0A, making it suitable for high-power standard industrial motors. It is designed for seamless integration with compatible mini contactors. Once attached, it provides both a Normally Open (NO) and Normally Closed (NC) auxiliary contact. These are typically used to disconnect the control coil power and trigger a fault indicator light when a trip occurs, ensuring the motor is safely isolated until the fault is resolved.

Technical Specifications

• Model Number: OL10D
• Type: Thermal Overload Relay
• Current Setting Range: 14.0A to 20.0A (Adjustable via dial)
• Mounting: Direct plug-in to compatible contactors
• Auxiliary Contacts: 1 NO + 1 NC
• Reset Options: Manual or Automatic reset (Selectable)
• Trip Class: Class 10A (Standard industrial trip speed)
• Insulation Voltage: 690V
• Phase Failure Sensitivity: Yes
• Standards: IEC 60947-4-1, EN 60947-4-1, CE, UL

Frequently Asked Questions

Q: How do I set the correct current on the relay?

A: You should identify the Full Load Amps (FLA) rating on your motor's nameplate. Turn the adjustment dial on the OL10D until the pointer aligns with that specific value. Setting the dial higher than the motor's rated amperage will reduce the effectiveness of the protection and risk motor damage.

Q: What is the difference between Manual and Auto reset?

A: In Manual mode, a technician must physically press the reset button on the unit after a trip once the unit has cooled. In Auto mode, the relay resets itself automatically. For safety reasons in machinery applications, Manual mode is the industry standard to prevent automatic restarts.

Q: Does this relay provide short-circuit protection?

A: No. Thermal overloads protect against "overload" (gradual overheating). You must still use fuses or a circuit breaker upstream to protect the circuit against "short-circuits" or instantaneous high-current faults.

Who can install this?

Installation must be performed by a qualified electrician. Configuring a thermal overload requires professional knowledge of motor characteristics and control circuit wiring. The installer must ensure the auxiliary contacts are correctly integrated into the control loop so that the contactor successfully drops out when a thermal fault is detected.

What is this for?

The IMO OL10D is the primary defense for Industrial Motor Applications:

• Heavy-Duty Pump Systems: Protecting larger centrifugal pumps and fluid handling systems within the 14.0A to 20.0A range.
• Industrial Ventilation: Ensuring that large-scale exhaust fans or industrial blower motors do not overheat if the airflow is obstructed.
• High-Load Conveyors: Protecting drive motors for heavy-duty assembly lines, palletizers, or material handling equipment.
• Phase Loss Protection: Detecting the loss of a single phase in a three-phase supply, which would otherwise cause the remaining phases to draw excessive current and burn out the motor.

Note: Some images and pictures are for reference only. The item may differ from the image/picture due to manufacturer's change. Should you require the exact item in the picture, please call or email us to enquire.