Eaton CH Mechanical Interlock ...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$94.52
Eaton CH Mechanical Interlock for Loadcenters and Breakers

Eaton CH Mechanical Interlock for Loadcenters and Breakers

(No reviews yet) Write a Review

Model: CHML

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

$94.52
Adding to cart… The item has been added
Free Shipping on orders over $199
We price match and offer bulk discounts! Click Add to Quote. It's quick and easy.
✨
Earn points with this purchase! You can redeem points for giftcards, iPads, XBox's and more. View Rewards
Free Keying on all locks
You may also like

Eaton CH Mechanical Interlock for Loadcenters and Breakers

The Eaton CH Mechanical Interlock is engineered for use with Type CH 2-, 3-, and 4-pole breakers (clamshell) in CH loadcenters and breaker assemblies, providing a secure mechanical means of preventing simultaneous operation between a back-feed main breaker and the utility source. Rated 225 A with a three-phase configuration and an aluminum bus, this interlock is suited for NEMA 1 enclosure installations in commercial and industrial settings. It ships as a quantity of 10 hold-down kits used to secure the circuit breaker to the loadcenter for back-feed main application per NEC Article 384-16(g), giving electrical contractors a code-compliant solution for standby and generator interconnection projects.

Key Features

  • Type: Mechanical Interlock accessory for Eaton CH loadcenters and breakers.
  • Compatibility: Used with Type CH 2-, 3-, and 4-pole breakers (clamshell) for reliable fit and function.
  • Amperage Rating: 225 A for dependable back-feed main protection.
  • Durable Construction: Aluminum bus material engineered for consistent electrical performance.
  • Enclosure Rating: NEMA 1 rating suited for standard indoor installations.
  • Phase: Three-phase configuration for commercial and industrial power distribution.
  • Interrupt Rating: 10 kAIC interrupt rating.
  • Dimensions: 14.3 in product width, 34.1 in product length/depth, and 1.1 in product height.
  • Hold-Down Kits: Quantity 10 hold-down kits secure the circuit breaker to the loadcenter for back-feed main application per NEC Article 384-16(g).
  • Warranty: Backed by an Eaton limited lifetime warranty.

Certifications & Compliance

  • NEMA 1 Enclosure Rating
  • Complies with NEC Article 384-16(g) for back-feed main hold-down applications

Technical Specifications

  • Product Type: Load Center
  • Warranty: Limited lifetime
  • Main circuit breaker: CH

Typical Applications

  • Back-Feed Main Breaker Hold-Down Applications
  • CH Loadcenter and Panelboard Assemblies
  • Three-Phase Commercial and Industrial Electrical Installations
  • Standby and Generator Interconnection Projects
  • Panelboard and Load Center Wiring
  • Renovation and New Construction Electrical Projects

Why Eaton?

Eaton engineers the CH Mechanical Interlock with an aluminum bus, a 225 A rating, a 10 kAIC interrupt rating, and a NEMA 1 enclosure to deliver dependable, code-compliant performance for back-feed main applications on CH loadcenters and breakers. Backed by a limited lifetime warranty, it is built for professional electrical installations that demand consistent, secure, and code-compliant operation.

Manufacturer Resources

Product Specs

Product Width:
14.3 in
Used with:
Type CH for 2-, 3-, 4-pole breakers (clamshell)
Amperage Rating:
225A
Product Size:
3/4 in
Product Length/Depth:
34.1 in
Special features:
Used with CH 3/4 in Loadcenters and Breakers
Product Height:
1.1 in
Product Type:
Interlock
Phase:
Three-phase
Warranty:
Limited lifetime
Main circuit breaker:
CH
Interrupt rating:
10 kAIC
Bus material:
Aluminum
Configuration:
NEMA 1 Enclosure
Certifications:
Contact Manufacturer
Department:
Electrical
Product Material:
Aluminum
Product Group:
Circuit Protection
Product Subgroup:
Circuit Breakers
Product Weight:
8.6 lb
Product Length:
34.1 in

Eaton CHML – Frequently Asked Questions

1) Will the Eaton CHML interlock work with my CH loadcenter and breakers?
The Eaton CHML mechanical interlock is made for Type CH loadcenters and Type CH 2-, 3-, and 4-pole clamshell breakers, and it is specific to the 3/4 inch CH breaker footprint. If your panel is a Eaton BR loadcenter or another manufacturer's panel, this is not the part. Check the breaker face width and the panel label for CH before ordering.
2) What does a mechanical interlock kit actually do on a generator back-feed setup?
It physically prevents the back-feed main breaker and the utility main from being closed at the same time, so the generator can never energize the utility side. On the CHML, the kit also includes hold-down hardware that secures the back-fed breaker to the loadcenter bus, which is required for a back-feed main per NEC Article 384-16(g). That is the piece inspectors look for on a standby or generator interconnection job.
3) Is the Eaton CHML interlock rated for a three-phase panel?
Yes, it is configured for three-phase distribution and carries a 225 A rating with a 10 kAIC interrupt rating. That makes it a fit for commercial and industrial CH panelboard work rather than a small single-phase residential setup. Your panel and breaker ratings still have to match the 225 A and 10 kAIC figures.
4) Can the CHML interlock be used outdoors or in a wet location?
No. The CHML is built for NEMA 1 enclosure installations, which is indoor, dry location only. For an exterior wall or a washdown area you need a rain-tight or weatherproof enclosure rating instead, not a NEMA 1 assembly.
5) How much room do I need in the panel for the Eaton CH interlock?
Plan around 14.3 inches wide, 34.1 inches long/deep, and 1.1 inches high for the assembly. The low 1.1 inch profile is what lets it sit between the deadfront and the breakers, but the length means you need a tall enough CH loadcenter interior to accept it.
6) What is the Eaton part number for the CH mechanical interlock?
CHML is the Eaton catalog number for the CH mechanical interlock. Order by that designation to get the CH clamshell-breaker version rather than an interlock for another Eaton panel family.
7) How many hold-down kits come with the Eaton CHML?
It ships as a quantity of 10 hold-down kits, each used to secure a circuit breaker to the loadcenter for back-feed main application. For a contractor doing multiple standby installs that covers several panels from one order; for a single opening you will have spares.
8) What material is the Eaton CHML interlock bus made from?
Aluminum. That is the bus material Eaton specifies for this interlock, which matters if your spec or facility standard calls for copper bus throughout the distribution equipment.
How fast can I get the Eaton CHML 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 CHML come with a warranty?
Absolutely. The Eaton CHML 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 CHML?
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
Why buy the Eaton CHML from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
!