Cutler Hammer MMOTN Motor Operator Kit 6D32790G22

Cutler Hammer MMOTN Motor Operator Kit 6D32790G22

Cutler Hammer MMOTN Motor Operator Kit MPN: 6D32790G22 The MMOTN is an electromechanical spring-charging mechanism for Eaton Magnum DS insulated case circuit breakers. Automates breaker shutting spring compression. Operates on a control power circuit of dual 110-125 VAC/VDC. It can be charged fully in about 5 seconds, achieving remote closing and fast auto reclosing operation. This is an essential element in the integration of Magnum DS breakers in automatic transfer switches (ATS), generator synchronization panels and maritime switchboards.

Model Details & Part Number Cross-References

• Brand: Cutler Hammer / Eaton
• Model Type: MMOTN
• Primary MPN: 6D32790G22
• Alternative MPNs / Internal Designations: 6D32790G22X, EATON MMOTN, RY 120, A0245

Product Specifications: 6D32790G22

Key Features

1. Dual Voltage Capability: Operates reliably on both 110-125 VAC and 110-125 VDC control power sources, simplifying switchgear integration and reducing spare part inventory.
2. Rapid Spring Charging: Features a high-torque gear train that fully charges the breaker closing spring in just 5 seconds, ensuring rapid auto-reclose sequencing is available during faults.
3. Integrated Cut-Off Switch: Utilizes integrated micro-switches that mechanically disconnect the control power to the motor once the spring is fully charged, preventing over-torquing and motor burnout.
4. Manual Override Retention: Installation of the 6D32790G22 does not obstruct the breaker’s front-mounted manual pump handle, maintaining full mechanical redundancy during total control power loss.
5. Heavy-Duty Direct-Drive: Engineered for precise mechanical alignment with the Magnum DS chassis to minimize vibration, wear, and kinetic energy loss during the charging cycle.

Compatibility & Applications

• Compatible Equipment: Eaton / Cutler Hammer Magnum DS Low-Voltage Power Circuit Breakers, Magnum SB Switchboards.
• Marine Switchboards: Essential for main (MSB) and emergency (ESB) switchboards requiring remote synchronizing and power distribution.
• Automated Transfer Switches (ATS): Utilized in critical power systems where rapid, automated source transfers dictate fast breaker closing times.
• Industrial Plants: Standard implementation in heavy manufacturing power control modules requiring SCADA or remote push-button operations.
• Offshore Rigs: Highly reliable in vibration-heavy environments like offshore oil distribution hubs.

Marine Engineer Expert’s Guide

• Inrush Current and Voltage Drop: Universal spring charging motors draw a significant starting inrush current. Always verify the control circuit voltage drop during the initial 0.5 seconds of the charging cycle. A voltage dip below 95V can cause the motor to stall under load or the cut-off switch to chatter, leading to premature winding failure.
• Mechanical Lubrication Protocol: Do not install a new 6D32790G22 onto a dry breaker chassis. Prior to mounting, inspect the Magnum DS main charging cam and gears. Apply a light coat of OEM-approved synthetic grease (e.g., Mobil 28 or equivalent Molykote) to the mating surfaces. A stiff mechanism will overwork the motor.
• Secondary Terminal Integrity: In marine environments, engine room vibration frequently loosens the secondary disconnect terminal blocks. Ensure the standard control power lines (typically routed through the breaker’s secondary contacts) are firmly seated and torqued. Intermittent contacts will cause intermittent charging faults.

Frequently Asked Questions (FAQs)

What is the operating voltage for the Cutler Hammer MMOTN 6D32790G22?

The 6D32790G22 motor operator kit is engineered to run on both 110 to 125 VAC (50/60 Hz) and 110 to 125 VDC. This dual-voltage design makes it highly versatile for various industrial and marine control circuits.

How long does it take for the MMOTN motor operator to charge the breaker spring?

Under standard control voltage conditions, the 6D32790G22 motor will fully compress and lock the Magnum DS closing spring in approximately 5 seconds.

Is the 6D32790G22 compatible with all Magnum DS breakers?

This part number is the standard 110/125V mechanism for the Eaton / Cutler Hammer Magnum DS and Magnum SB lines. However, breaker compatibility depends strictly on your facility’s control voltage. Do not install this 125V unit on a 24VDC or 250VDC control system.

How do I know if my Magnum DS motor operator is failing?

Common indicators of impending failure include sluggish spring charging times (exceeding 8 seconds), excessive gear grinding or whining noises, or instances where the motor continues to run and draw current after the mechanical indicator displays “CHARGED”.

Can I manually charge the breaker if the MMOTN motor fails?

Yes. The installation of the motor operator does not disable or obstruct the front-mounted manual charging handle on the Magnum DS breaker. In the event of a control power loss or motor failure, operators can pump the handle to manually charge the closing spring.