Best Generator Interlock Kits for 150/200 Amp Panels You Can Trust
Answering the search intent: these interlock kits are designed to safely connect a portable generator to 150 or 200 amp breaker panels. They help protect against backfeed, allow controlled switching, and are best for homeowners who want a code-compliant, easy-to-install solution or professional installers seeking reliable hardware.
The top picks below are suited for different panel brands and setups. The first choice targets Square D QO or Homeline panels; others cover Eaton Cutler Hammer, General Electric, and general compatibility. Use this guide to compare compatibility, spacing, and installation practicality to match your needs.
Comparison Table
| Product | Panel Compatibility | Spacing (Main to Generator) | Best For |
|---|---|---|---|
| Generator Interlock Kit Compatible with Square D QO or Homeline | Square D QO or Homeline 150/200A | 1 3/8 inches | Square D users seeking standard interlock fit |
| Generator Interlock Kit for Eaton Cutler Hammer BR Series | Eaton BR 150/200A | 1 1/4–1 7/16 inches | Eaton BR panels with flexible spacing |
| Generator Interlock Kit Compatible with Square D QO or Homeline | QO or Homeline 150/200A | 1 3/8 inches | Similar compatibility for a second tested option |
| Generator Interlock Kit for Square D QO or Homeline | Square D QO or Homeline 150/200A | 1 3/8 inches | Standard, easy-install option |
| Generator Interlock Kit for GE 150/200A Panels | GE 150/200A | 1 1/4 inch | GE panels with documented 1 1/4″ spacing |
Generator Interlock Kit for Square D QO or Homeline 150/200A
Choosing this option benefits Square D users who want a trusted, ready-to-install interlock with proven spacing and a straightforward setup. It suits homeowners seeking a standard, widely supported kit for 150/200A panels.
Caution: Always verify exact panel model compatibility before purchase to avoid fit issues.
Best for Eaton Cutler Hammer BR panels needing flexible spacing, this kit aligns with BR 150/200A models and includes a drill bit and manual to aid installation. It’s a solid choice for contractors or DIYers with BR panels seeking a sturdy interlock.
Caution: Verify the kit’s spacing range matches your exact BR panel configuration before ordering.
Best for Square D QO or Homeline panels, this kit supports 1 3/8″ spacing and includes installation guidance. It’s suitable for users who want a familiar, widely-available interlock for common 150/200A configurations.
Caution: Confirm your panel model and bus arrangement to ensure a correct fit before purchase.
Generator Interlock Kit for Square D QO/ Homeline
Best for quick installs on Square D QO or Homeline panels with 1 3/8″ spacing, this kit emphasizes a straightforward setup and strong panel integration. It’s a good pick for homeowners who want reliable interlock hardware with simple instructions.
Limitation: The kit’s exact fit depends on panel model year and internal layout; double-check compatibility before ordering.
Generator Interlock Kit for GE 150/200 Amp Panels
Best for General Electric GE panels, this interlock kit uses a 1 1/4″ spacing between main and branch breakers. It includes a steel drill bit and installation guide for a precise, secure fit. Designed to minimize power outages by safely directing generator power.
Consideration: Some GE panels may require different spacing or mounting methods; verify the exact model compatibility before purchase.
Buying Guide
What should I look for when choosing a generator interlock kit?
- Panel compatibility: Confirm the kit states compatibility with your panel brand and model (Square D QO, Homeline, GE, Eaton BR, etc.).
- Spacing: Check the specified distance between main and generator breakers (commonly 1 1/4″ to 1 3/8″).
- Installation complexity: Look for kits that include a drill bit, clear instructions, and measured templates to simplify mounting.
- Material quality: Premium metals and hardware improve longevity and resistance to bending or warping.
- Code compliance: Ensure the kit supports safe backfeed prevention and aligns with local electrical codes.
- Future compatibility: If you plan to upgrade panels, choose a kit that’s known to work with multiple models or brands.
Installation Considerations
Most interlock kits require turning off main power, removing the panel cover, and aligning the interlock with the bus stabs. A proper drill and the included hardware ensure a secure, code-compliant installation. If you’re unsure, consult a licensed electrician to confirm fit and electrical safety.
What’s the Best Choice For You?
- Best for Square D QO/Homeline: kits labeled for QO/Homeline 150/200A with 1 3/8″ spacing.
- Better for Eaton BR panels: kits designed specifically for BR 150/200A with flexible spacing.
- GE-focused option: choose GE-compatible kits with 1 1/4″ spacing for 150/200A panels.
Common Questions
- Do interlock kits require professional installation? Not always, but a licensed electrician is recommended for safety and code compliance.
- Will these kits work with all generator sizes? They are designed for specific panel ratings (150/200A) and must align with generator output and panel configuration.
- Can I install the kit myself? If you have electrical experience and follow instructions, it can be feasible; otherwise hire a pro.
- Are interlock kits code-compliant everywhere? Codes vary by location; confirm with local electrical codes and utility requirements.
- What if my panel isn’t listed? Do not assume compatibility; select a kit explicitly labeled for your panel model or brand.