Okay, I understand. You're looking to replace existing fused disconnects with standalone 3-phase circuit breakers in a space-constrained environment, needing both 100A and 200A frame sizes. Here's a breakdown of product options from Schneider Electric, Eaton, and GE, keeping in mind space efficiency and code compliance

Key Considerations for Breaker Selection:
Amperage

You need 100A and 200A ratings.

Voltage

Confirm the voltage of your system (e.g., 240V, 480V, 600V). This is CRITICAL.

AIC Rating (Ampere Interrupting Capacity)

This is the maximum fault current the breaker can safely interrupt. It MUST be equal to or greater than the available fault current at the installation point. Have a qualified electrician or engineer calculate or verify the available fault current. Undersizing the AIC rating is a serious safety hazard.

Enclosure Type

Consider the environment (indoor/outdoor, dusty, wet, corrosive). NEMA ratings (e.g., NEMA 1, 3R, 4, 4X, 12) will dictate the enclosure. If the old disconnects are in enclosures, you might be able to reuse the enclosures if they are in good condition and properly sized for the breakers.

Physical Size

This is your biggest constraint. Look for compact designs.

Approvals

UL Listed or equivalent certification is essential.

Accessories

Consider accessories like shunt trips, auxiliary contacts, and undervoltage releases, if needed for your application.

Code Compliance

All work needs to be done according to the NEC and any local codes and ordinances.

Product Options (with space considerations)



1. Schneider Electric



PowerPact™ Molded Case Circuit Breakers

Schneider's PowerPact series (B-frame, H-frame, J-frame, L-frame) are generally well-regarded for their compact size and robust performance.

B-Frame (up to 125A)

For your 100A needs, the B-frame PowerPact offers a very compact solution. They have good AIC ratings for their size. These are a good choice if space is tight.

H-Frame (up to 150A)

This is an older line but is still available. It would cover 100A

J-Frame (up to 250A)

The J-frame is a good choice for your 200A needs. It's relatively compact for a 200A breaker, especially if you're comparing it to older designs.

L-Frame (up to 400A)

Larger frame, less likely to be used due to size, but mentioned for completeness.

Key Features of PowerPact



Compact Design

Relatively small footprint, maximizing space utilization.

High AIC Ratings

Available with various AIC ratings to meet different system requirements.

Easy Installation

Designed for straightforward installation and wiring.

Accessories

Wide range of accessories for enhanced functionality.

Ecoreach and ROHS compliant

Good for future proofing and recycling.

Considerations

Check lead times; some PowerPact models can have longer lead times than other brands due to high demand. Pricing can be slightly higher than some competitors, but the compact size and performance may justify the cost.

2. Eaton



Series C Molded Case Circuit Breakers

Eaton's Series C breakers are another excellent choice, known for their reliability and wide availability.

GHB (up to 125A)

A good choice for your 100A needs. Compact and reliable.

HGB (up to 150A)

This option is available for your 100A, but it's slightly larger than the GHB.

JD (up to 250A)

A solid option for your 200A requirement.

Eaton offers the most product lines. This means there are older or more expensive options but also more available solutions.

Key Features of Series C



Reliable Performance

Proven track record for reliable operation.

Wide Range of Ratings

Comprehensive selection of current ratings and AIC ratings.

Global Availability

Easily sourced through various distributors.

Multiple Trip Units

Options for thermal-magnetic, electronic, and solid-state trip units to match specific application needs.

Considerations

While generally compact, the exact dimensions can vary depending on the specific model and AIC rating. Check the datasheets carefully. Some older Eaton breaker lines are larger than newer designs, so be sure you are looking at the Series C.

3. GE (General Electric)



Spectra Series Molded Case Circuit Breakers

GE's Spectra series is a well-established line of breakers.

SE150 (up to 150A)

This breaker is appropriate for your 100A needs. It is a solid state trip breaker that tends to be more reliable and repeatable.

SE250 (up to 250A)

Use for 200A requirement. Solid state trip.

TQD/THQD

These are bolt on frame breakers that are available as well. They are small in size but require panelboards to mount in.

Key Features of Spectra Series



Versatile

Available in a wide range of ratings and configurations.

Solid State Trip

SE breakers offer higher levels of protection than typical thermal magnetic breakers.

Compact Trip Unit

SE breakers trip units are mounted internally in the breakers which makes for a compact design.

Considerations

GE's electrical business was acquired by ABB in 2018, but the GE brand is still used for many products. Ensure you are dealing with a reputable supplier. The Spectra series has been around for a while; while reliable, it might not have all the newest features of some newer breaker lines.

Steps to Take


Gather Information



Voltage

Critical! (e.g., 240V, 480V, 600V).

Amperage

100A and 200A (per circuit you're replacing).

Available Fault Current

This is essential for selecting the correct AIC rating. Have a qualified electrician determine this.

Enclosure Requirements

Determine NEMA rating needed based on the environment.

Existing Disconnect Dimensions

Measure the existing disconnects to understand the available space.2.

Consult with an Electrical Engineer or Qualified Electrician

This is crucial for safety and code compliance. They can help you: Verify the available fault current. Select the correct breakers with the appropriate AIC ratings and trip characteristics. Ensure the installation complies with all applicable codes.3.

Compare Datasheets

Download datasheets from Schneider, Eaton, and GE for the breakers that meet your amperage and voltage requirements. Pay close attention to the dimensions (width, height, depth).4.

Consider Enclosure Options



Reuse Existing

If the existing disconnect enclosures are in good condition and large enough, you might be able to reuse them. Verify they are properly rated for the environment and the new breakers.

Purchase New

If you need new enclosures, choose ones that are specifically designed for the breakers you select.5.

Installation

Have a qualified electrician perform the installation.

Important Safety Notes



De-energize

ALWAYS de-energize the circuit completely before working on electrical equipment. Lockout/Tagout procedures are essential.

Qualified Personnel

Only qualified electricians should perform this type of work.

Code Compliance

Adhere to all applicable electrical codes and regulations.*

AIC Rating: NEVER install a breaker with an AIC rating lower than the available fault current. This is a major safety hazard.By carefully considering the factors above and consulting with a qualified professional, you can choose the most appropriate and space-efficient circuit breakers to replace your existing fused disconnects. Good luck! Flag for review