imo mcor-3-28 thermal overload relay for mc50-mc74 contactors 20-28 amps

Why Choose the IMO MCOR-3-28 Thermal Overload Relay?

The IMO MCOR-3-28 is a robust industrial thermal overload relay engineered to provide dependable motor protection for heavy-duty industrial control and automation systems. Designed specifically for integration with the IMO MC contactor range, this overload relay protects motors against overload conditions, phase failure and excessive current draw, helping maximise motor lifespan and minimise costly downtime in demanding industrial applications.

Part of the proven IMO MCOR thermal overload relay series, the MCOR-3-28 features an adjustable overload setting range of 20 to 28A, with star-delta protection support from 35 to 48A. The relay includes integrated 1NO + 1NC auxiliary contacts and manual reset functionality, making it ideal for industrial motor starter assemblies requiring reliable overload and phase-failure protection.

Its compact contactor-mounted design allows direct installation onto compatible IMO MC50 to MC74 contactors, creating a reliable and efficient motor starter solution for pumps, compressors, conveyors, HVAC systems and industrial process machinery.

Key Advantages

• Reliable thermal overload motor protection for industrial applications.
• Adjustable overload range from 20 to 28A.
• Supports star-delta motor protection from 35 to 48A.
• 1NO + 1NC auxiliary contacts included.
• Designed for use with IMO MC50 to MC74 contactors.
• Compact plug-in industrial mounting configuration.

Key Features

• IMO MCOR thermal overload relay series.
• 20 - 28A adjustable current range.
• 35 - 48A YD star-delta protection range.
• Suitable for MC50 to MC74 contactors.
• Manual reset operation.
• 1NO + 1NC auxiliary contacts.
• Integrated thermal overload and phase failure protection.
• Compact contactor-mount industrial design.

Technical Specifications

• Manufacturer: IMO Precision Controls
• Series: MCOR Thermal Overload Relays
• Model: MCOR-3-28
• Product type: Thermal overload relay
• Adjustable current range: 20 - 28A
• Star-delta range: 35 - 48A
• Compatible contactors: IMO MC50 to MC74
• Auxiliary contacts: 1NO + 1NC
• Reset mode: Manual reset
• Mounting type: Plug-in / contactor mount
• Number of poles: 3 pole
• Rated operational voltage: up to 690V AC
• Protection function: Thermal overload and phase failure protection
• Tripping current: 20A minimum, 48A maximum
• Approvals: UL approved, CE compliant, RoHS compliant

Reliable Motor Protection for Industrial Systems

Thermal overload relays such as the IMO MCOR-3-28 are designed to protect electric motors from overheating caused by overload conditions, stalled rotors or phase imbalance. By disconnecting the motor before thermal damage occurs, overload relays help improve system reliability, reduce maintenance costs and protect industrial equipment from premature failure.

The MCOR series is specifically engineered for direct integration with IMO MC contactors, creating compact and dependable motor starter assemblies suitable for demanding industrial automation systems and heavy-duty machinery.

Typical Applications

• Industrial motor starter assemblies.
• Pumps and compressor systems.
• HVAC and ventilation equipment.
• Conveyors and material handling systems.
• Industrial automation machinery.
• Three-phase motor protection systems.

Trusted by Industrial Automation Engineers

IMO MCOR thermal overload relays are trusted throughout industrial automation systems for dependable motor protection, reliable overload detection and long-term operational performance.