You're describing a relatively standard, albeit specialized, application for generator paralleling and backfeed prevention. Let's break down the components and where to find them

Understanding the Requirements
Enclosed Circuit Breaker (ECB)

This is essentially a circuit breaker housed in a NEMA-rated enclosure (typically NEMA 3R or 4 for outdoor use). It provides overcurrent protection and isolation.

800A, 480/277V, 65kA

These are the electrical specifications: 800 Amps: The continuous current rating of the breaker. 480/277V: This is the voltage system (480V phase-to-phase, 277V phase-to-neutral). Confirm this matches your site requirements. 65kA: This is the Short-Circuit Interrupting Rating (kAIC). This is crucial; it must be greater than the available fault current at the point of installation. The utility or an engineering study will provide this number.

Outdoor Rated

This means the enclosure must be suitable for outdoor use, typically NEMA 3R (rainproof and sleet-resistant) or NEMA 4 (watertight). NEMA 4X (corrosion-resistant) is also common.

Kirk Key Interlock

This is the critical safety feature. A Kirk Key interlock system ensures a specific sequence of operations. Typically, a key is required to open the disconnect, and that key can only be removed when the disconnect is open. This key then unlocks another device (like the generator breaker), preventing simultaneous operation. It ensures only the utility source OR the generator source is connected to the load.

Generator Backfeed Protection

This is the purpose of the Kirk Key. The key guarantees that the main breaker is open before the generator can be connected. This prevents the generator from backfeeding onto the utility grid, which is dangerous and illegal.

Finding the Equipment

You'll need to contact electrical equipment manufacturers or distributors. Here's a breakdown of who to contact and what to ask:

Major Circuit Breaker Manufacturers (Recommended First)



Eaton

Eaton is a strong contender. They offer a wide range of circuit breakers and enclosures, and they are very familiar with Kirk Key interlocking systems. Look for their Power Defense or Series C breakers.

Schneider Electric/Square D

Schneider Electric is another top choice. They have a robust offering of circuit breakers (Masterpact, Powerpact) and enclosures. They also have experience with Kirk Key systems.

Siemens

Siemens is a well-established manufacturer with a complete line of circuit breakers and switchgear. They can definitely provide an ECB with a Kirk Key.

ABB

ABB (Asea Brown Boveri) is a global leader in power and automation. They offer a comprehensive portfolio of circuit breakers and can provide a solution with a Kirk Key.

Electrical Equipment Distributors



Graybar

Large national distributor.

CED (Consolidated Electrical Distributors)

Another large national distributor.

Rexel

International distributor.

Local Electrical Wholesalers

A local distributor can often provide personalized service and may have better access to regional manufacturers.

Kirk Key System Specialists



Smith Systems

They are a well-known provider of kirk key systems and have been providing them for decades.

Castell Safety International

Similar to smith systems, Castell Safety International has been providing kirk key systems for decades.

What to Tell the Vendor

Be very specific in your request. Provide all the following information:1.

Voltage

480/277V2.

Amperage

800A3.

Short-Circuit Interrupting Rating (kAIC)

65kA (absolutely critical!)4.

Enclosure Type

NEMA 3R or NEMA 4 (specify the exact requirement)5.

Description

"Enclosed Circuit Breaker (ECB) disconnect switch with a Kirk Key interlock for generator backfeed protection."6.

Application

"Generator paralleling/backup power system. The Kirk Key system must prevent simultaneous operation of the utility and generator sources."7.

Interlocking Sequence

Describe exactly how you want the Kirk Key system to work. For example: "Key is trapped in the utility ECB when the breaker is closed." "When the utility breaker is opened, the key can be removed." "The key is then used to unlock the generator breaker, allowing it to be closed." "The generator breaker key is trapped when the generator breaker is closed." "The key must be removed from the generator breaker to re-close the utility breaker."8.

One-Line Diagram

If you have a one-line diagram of your system, provide it. This will help the vendor understand the overall configuration.9.

Number of Keys

Determine how many keys you need for operation and maintenance.10.

Specific Breaker Requirements

If you have preferences regarding brand or breaker type (e.g., molded case, insulated case, draw-out), mention them.

Important Considerations



Coordination Study

Ensure a proper coordination study has been performed. This study verifies that the circuit breaker settings are correctly coordinated to provide selective tripping (meaning the breaker closest to the fault trips first). The EOR should be providing this.

UL Listing

The entire assembly (breaker and enclosure) should be UL listed.

Local Codes

Make sure the installation complies with all local electrical codes and regulations.

Commissioning

After installation, the Kirk Key system must be thoroughly tested to ensure it operates as intended.

Training

Provide training to personnel on the proper operation of the Kirk Key system.

Maintenance

Regular maintenance of the breaker and the Kirk Key system is essential.*

Review the EOR's Design

Before proceeding, double-check the EOR's design. Understand why they chose an ECB with a Kirk Key over a more traditional automatic transfer switch (ATS) or a simple disconnect switch with a mechanical interlock. There may be specific reasons related to the site's electrical system or the generator's requirements.

In summary, contacting the major circuit breaker manufacturers directly is the best approach. Clearly communicate your requirements, including the electrical specifications, enclosure type, and, most importantly, the interlocking sequence for the Kirk Key system. A well-defined Kirk Key system is critical for safety and preventing backfeed onto the utility grid. Flag for review