GE MMII-PD-1-2-240 Motor Protection Relay

Description

GE MMII-PD-1-2-240 Motor Protection Relay

Product Dimensions：

The GE Multilin MMII-PD-1-2-240 (General Electric Multilin Motor Manager II) is a legacy, high-reliability micro-processor-based motor protection system. It is designed to provide comprehensive control, protection, and monitoring for low-voltage, three-phase AC induction motors.

Product Detailed Description

The MMII-PD-1-2-240 acts as an intelligent motor management system. It integrates multiple discrete protection functions (such as overload relays, phase loss monitors, and ground fault detectors) into a single, compact panel-mount unit. The specific model breakdown indicates a Drawout unit with Profibus communication and a 240V AC control power rating.

Technical Parameters (Model Breakdown: MMII-PD-1-2-240)

Product Advantages

• Drawout Construction: The “D” in the model number specifies a drawout chassis. This allows the inner module to be pulled out of the switchgear rack for rapid testing or replacement without disturbing the terminal wiring.
• Comprehensive Protection: Combines thermal overload, phase unbalance/loss, locked rotor, mechanical jam, and undercurrent (dry pump) protection in one module.
• Fieldbus Connectivity: Equipped with Profibus-DP, enabling easy integration into Distributed Control Systems (DCS) or PLC environments for real-time status and diagnostic reading.
• Historical Data Logging: Stores diagnostic data surrounding the last trip (e.g., motor current at time of fault), allowing engineers to quickly perform root-cause analysis.

Important Considerations & Precautions

• Legacy Support: The MMII series is a legacy/matured product line from GE Multilin. Ensure your plant has a strategy for migration (such as upgrading to the modern Multilin MM200 or MM300 series) as spare parts become scarce.
• CT Phasing: Correct polarity and phasing of the Current Transformers (CTs) are mandatory. Incorrect wiring will lead to false phase unbalance calculations and nuisance tripping.
• Control Voltage Range: This unit is strictly rated for 240V AC. Powering it with 110V AC will cause under-voltage operation and failures, while higher voltages will permanently damage the internal power board.
• Drawout Safety: While designed for easy extraction, do not pull the module out under heavy load or high-vibration conditions without verifying the bypass or isolation state of the motor.

Product Applications

The MMII-PD-1-2-240 is primarily found in heavy industrial Motor Control Centers (MCCs):

• Oil & Gas Refineries: Controlling and protecting high-reliability pumps, compressors, and fans.
• Water & Wastewater Treatment: Managing large submersible pumps, aeration blowers, and mixers.
• Mining & Metals: Protecting conveyor drives, crushers, and material handling equipment.
• Power Generation Facilities: Managing critical low-voltage auxiliary motors used for boiler feeds and cooling systems.

Shipping Port: Xiamen, China

Payment: Bank of Chicago, Bank of Singapore

Express cooperation: fedex, DHL, UPS and your express account

Service: Professional Sales provides 24 hours /7 days online service

Please make an inquiry for more models：