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3 year warranty

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GE Multilin's MMII-PD-MOD501-120 is a microprocessor-based motor protection system that also offers a panel MT w/ display.



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  • Part Number: MMII-PD-MOD501-120
  • Manufacturer: GE Multilin
  • Series: MM2 Motor Manager

MMII-PD-MOD501-120 Technical Specifications

Model Number MMII-PD-MOD501-120
Manufacturer General Electric Multilin (GE)
Manufacturing Location Markham, Ontario, Canada
Dimensions approx. 7.4” L, 4.4” H, 5” W
Weight 1.36 kg
Software EnerVista MMII
Analog Input Range 4 – 20 mA
Operating Temperature Range 0° C to 60° C
Pollution Degree II
Overvoltage Category II

Product Description

The Multilin series of motor control center units was originally developed by the automation division of GE. The modules in this series are each designed to cover numerous functions in regards to protecting and controlling motors.

The functions that the MMII-PD-MOD501-120 cover range from protecting motors from any possible overloading or phases becoming unbalanced. In the event of contactors or rotors failing or becoming stalled, then the module is capable of overriding and managing the issues itself.

This unit is also outfitted with an array of useful internal hardware, such as a hot winding thermistor circuit, which reacts with an electrical charge in the event of a temperature change. There is also an undervoltage auto restart unit in case the intake dips to lower than the minimum level needed (120 volts of alternating current).

Externally, this unit is equipped with a large number of input and output ports. There’s 20 I/O ports integrated into it. 4 of them are outputs, 2 contractor outputs, and then 2 programmable outputs. The other 16 ports are input ports. 6 are fixed inputs, and then 10 are programmable.

The monitor display is capable of showing the phase current, ground current, thermal capacity and analog input on the monitor. It also records both trip and pre-trip values for proper evaluation.

These models are all outdated and obsolete pieces of automation technology. However, our technical staff at AX Control have fully refurbished and optimized each of these models that we have in stock.

Frequently Asked Questions about MMII-PD-MOD501-120

What are some of the protective features of the MMII-PD-MOD501-120? How do they work to safeguard the relay?

Some of the safeguarding features of the relay include thermal overload protection, ground fault detection, overtemperature protection, undercurrent and underpower protection, and overvoltage protection. The ground fault feature can detect ground currents by measuring the ground fault level as a percentage of the CT primary; detected overcurrents can trigger trips or alarms to ensure system safety.

How configurable is the MMII-PD-MOD501-120? How does the relay determine when trips and alarms occur?

The MMII-PD-MOD501-120 runs on a series of highly versatile settings referred to as ‘setpoints’ which govern system activities, such as when trips and alarms occur, what parameters are collected by the device, and which overload curves should be employed for system protection. As mentioned, users can edit setpoints to determine when trip and alarms occur by setting a threshold for the system to trigger these safety responses. When the relay detects that system parameters rise above a user-set rating for a user-set amount of time, the relay can activate an appropriate response to shield the system from further harm.

Reviews For MMII-PD-MOD501-120

Internal Review

General Electric Multilin’s MMII-PD-MOD501-120 is capable of metering system parameters such as thermal capacity used, current unbalance, power, energy, voltage, ground fault leakage current, and more. It can employ both the liquid-crystal display and EnerVista software program to reflect these values to users. - AX Control Tech

Repair Services For MMII-PD-MOD501-120

Type Lead Time Price Action
Repair Service 1-2 weeks $970

Our highly skilled technicians can repair your MMII-PD-MOD501-120. All of our repairs come with a 3 Year AX Control Warranty. Please contact us for additional information about our repair process. To receive the repair pricing and lead time listed above please process your repair order via our website. The following repair options may be available upon request:

  • 48-72hr Rush Repair
  • Detailed Repair Reports
  • AX Control Certificate of Warranty

AX Control Warranty Info

All products we sell are backed by our unparalleled warranty. A warranty certificate will be provided with your order upon request.
All PLCs, HMIs, and Turbine Control Boards: 3 Years
All AC/DC and Servo Drives: 2 Years
All Motors: 1 Year
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