Eaton Mechanical Interlock Kit...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$33.79
Eaton Mechanical Interlock Kit for 15-75A Contactors and Starters

Eaton Mechanical Interlock Kit for 15-75A Contactors and Starters

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Model: C321KM60B

In Stock (leaves warehouse same day if ordered before 3pm ET)

$33.79
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Eaton Mechanical Interlock Kit for 15-75A Contactors and Starters

The Eaton Mechanical Interlock Kit is engineered for use with 15-75A Eaton contactors and starters, providing a horizontal-mount mechanical interlock that prevents two paired contactors from closing at the same time. This is critical in reversing motor control and transfer switch applications, where simultaneous closure could create a dangerous short circuit or equipment damage. Compatible with NEMA-rated contactors and starters, the kit is supplied as a complete kit-type assembly and is backed by Eaton's 1-year warranty, giving electrical contractors and panel builders a dependable, code-conscious solution for motor control coordination.

Key Features

  • Frame Size: Designed for use with 15-75A contactors, ensuring correct mechanical fit and coordination between paired units.
  • Mounting: Horizontal mounting configuration simplifies installation between adjacent contactors or starters.
  • Type: Supplied as a complete kit, purpose-built for mechanical interlocking of contactor pairs.
  • Special Features: Used with NEMA contactors and starters, making it a straightforward addition to Eaton motor control assemblies.
  • Warranty: Backed by Eaton's 1-year warranty for added reliability and peace of mind on the job.

Technical Specifications

  • Warranty: 1 year
  • Department: Electrical

Typical Applications

  • Reversing Motor Control Circuits
  • Transfer Switch Assemblies
  • Motor Control Centers
  • Panelboard and Starter Enclosures
  • Commercial and Industrial Electrical Installations

Why Eaton?

Eaton builds motor control accessories to work seamlessly with its own line of NEMA contactors and starters, and this mechanical interlock kit is no exception — it is purpose-matched to 15-75A frame sizes for correct fit and dependable mechanical coordination. Backed by a 1-year manufacturer warranty, it gives electrical professionals a straightforward, code-conscious way to safely interlock reversing contactor pairs. Choosing Eaton means specifying components engineered to fit and perform together as a coordinated motor control system.

Manufacturer Resources

Product Specs

Frame size:
15-75 A contactors
Warranty:
1 year
Product Type:
Interlock Kit
Mounting Method:
Horizontal
Special features:
Used with NEMA contactors and starters
Department:
Electrical
Amperage Rating:
15-75A
Configuration:
Horizontal Mounting
Product Group:
Motor Control & Automation
Product Subgroup:
Motor Starters & Contactors

Eaton C321KM60B – Frequently Asked Questions

1) What does the Eaton C321KM60B mechanical interlock kit actually do in a reversing starter?
The C321KM60B is a mechanical interlock that physically prevents two paired Eaton contactors from closing at the same time. In a reversing motor circuit, forward and reverse contactors closing together would short line phases together, so the interlock bars one from pulling in while the other is closed. Same idea in a transfer scheme, where it keeps two sources from being tied together.
2) Will this Eaton interlock kit fit my contactors, or do I need a different frame size?
It is matched to Eaton contactors and starters in the 15-75A frame range. Outside that range the kit will not line up, so check the amp rating of the pair you are interlocking first. Both units in the pair have to be in that same 15-75A group.
3) Does the Eaton 15-75A interlock kit mount side by side or one contactor above the other?
Horizontal mounting only. The two contactors sit adjacent to each other on the panel and the interlock bridges between them, so lay out your backplate for side-by-side spacing rather than stacking the pair vertically.
4) Does this work with IEC contactors or only NEMA?
The kit is specified for use with NEMA contactors and starters. If you are building with IEC-frame devices, this is not the interlock for that assembly.
5) Is a mechanical interlock enough on a reversing starter, or do I still need electrical interlocking?
The C321KM60B handles the mechanical side only, blocking simultaneous closure of the paired contactors. It does nothing to your control wiring, so auxiliary contact or pushbutton electrical interlocking in the control circuit is still a separate item you specify and wire yourself.
6) Is the Eaton C321KM60B a single part or does it come as an assembly?
It ships as a complete kit-type assembly, purpose-built for interlocking a contactor pair, rather than as a loose bracket you have to combine with other pieces. The orderable part number is C321KM60B.
7) Where is this Eaton interlock kit typically used besides reversing motors?
Beyond reversing motor control, it shows up in transfer switch assemblies, motor control centers, and panelboard or starter enclosures on commercial and industrial jobs, anywhere a pair of 15-75A Eaton contactors must never close together.
How fast can I get the Eaton C321KM60B delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Eaton C321KM60B come with a warranty?
Absolutely. The Eaton C321KM60B is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Eaton C321KM60B?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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