Best Generator Interlock Kits for Panel Safety and Backup Power
Answers for buyers seeking a safe, code-compliant generator interlock solution. This guide highlights five top interlock kits that fit common panels from Square D, Eaton, GE, Siemens/Murray, and more. Each entry shows who it’s best for, installation notes, and any limitations. Ideal for homeowners wanting reliable, hands-off transfer between utility power and portable generators while keeping appliances safe and powered during outages. The listed products are selected for clear compatibility, practical installation, and straightforward operation.
Summary of chosen products
- Natupal Generator Interlock Kit — Square D QO/Homeline 150/200 A panels. Best for Square D users seeking a straightforward interlock with 1 3/8″ spacing.
- EXCELFU Generator Interlock Kit — Eaton Cutler Hammer BR series 150/200 A. Best for Eaton users needing a robust horizontal interlock kit.
- SPZOCE GE Interlock Kit — General Electric 150/200 A panels. Best for GE panels with easy installation and clear spacing guidance.
- EXCELFU GE Interlock Kit — GE 150/200 A panels (alternate option). Best if you want a GE-specific kit with 1 1/4″ spacing.
- XMK Siemens/Murray Interlock Kit — Siemens/Murray 150/200 A panels. Best for Siemens/Murray panels with 7/8″ to 1 1/4″ spacing.
Natupal Interlock Kit for Square D QO or Homeline
Compatibility and spacing: Designed for Square D QO or Homeline 150 and 200 amp panels, with a 1 3/8 inch gap between the main and generator breaker. This spacing is specified to keep main and back-up power from overlapping during operation. The kit’s interlock plate prevents both sources from feeding the panel simultaneously, addressing safety concerns during outages.
Who it’s best for: Homeowners with Square D QO or Homeline panels who want a straightforward, professionally styled interlock option. It is a practical choice for those who prefer a single-panel solution without extra remote switches.
Why selected: It directly targets common Square D installations and offers a clear installation path with the specified spacing. The kit is framed as a safety solution to prevent backfeed and accidental generator energization during outages.
Caution: Verify that your panel model accepts this specific interlock arrangement and that the 1 3/8″ spacing aligns with your breaker layout before purchase.
EXCELFU Interlock Kit for Eaton BR Series 150/200 A
Compatibility and spacing: Fits Eaton/Cutler Hammer BR series 150 and 200 amp panels; spacing between the main breaker and branch breakers is 1 1/4″ to 1 7/16″. The kit supports safe backfeeding of a portable generator while the main is disengaged.
Who it’s best for: Homes with Eaton Cutler Hammer BR panels seeking a reliable, affordable interlock that is easy to install with the included hardware and manual.
Why selected: The kit targets a widely used Eaton panel family and provides a clear interlock mechanism that prevents simultaneous mains and generator power. It emphasizes safety and cost-effectiveness for outages.
Caution: Confirm exact panel model and spacing before ordering, as the kit’s fit depends on the internal breaker arrangement and panel depth.
SPZOCE Interlock Kit for GE 150/200 A Panels
Compatibility and spacing: Fits General Electric GE 150 or 200 amp panels with a 1 1/4″ distance between main and branch breakers. It provides an installation path that includes a drill bit and manual for guidance.
Who it’s best for: GE panel owners who want a practical, installation-friendly interlock with included hardware for a smoother setup during outages.
Why selected: It pairs GE panels with a straightforward installation kit, emphasizing safety and reliable generator power management for home appliances.
Caution: Review exact GE panel model and the neighbor breaker layout to ensure the 1 1/4″ spacing is achievable in your panel design.
EXCELFU Interlock Kit for GE 150/200 Amp (Alternate)
Compatibility and spacing: GE 150/200 amp panels with a 1 1/4″ spacing between main and branch breakers. The kit is designed to prevent concurrent mains and generator power, directing generator power safely to circuits in the home.
Who it’s best for: GE panel owners seeking a second GE-compatible option with a compact spacing specification and clear safety benefits during outages.
Why selected: It reinforces the GE-side options, giving buyers alternatives in the GE family, and emphasizes safe operation during outages.
Caution: Ensure your specific GE model matches the kit’s spacing requirements before purchasing.
XMK Interlock Kit for Siemens/Murray 150/200 A
Compatibility and spacing: Works with Siemens/Murray 150 or 200 amp panels. Spacing ranges from 7/8″ to 1 1/4″ depending on the model, with guidance to verify model and spacing before installation.
Who it’s best for: Homeowners with Siemens or Murray panels looking for a versatile interlock that accommodates multiple spacing options.
Why selected: It covers the Siemens/Murray line with flexible spacing, helping installers match their panel’s exact needs for safe generator backfeed.
Caution: Confirm your panel’s exact model and acceptable spacing, as incorrect pairing can affect interlock function.
SPZOCE Interlock Kit for Siemens or Murray 150/200 A
Compatibility and spacing: Interlock kits for Siemens or Murray 150 & 200 amp panels, with spacing between main and branch breakers at 7/8″ to 1 1/4″. Installation includes a 3/16″ drill bit and manual for guidance.
Who it’s best for: Siemens or Murray panel owners who want a professional interlock with explicit spacing ranges to match their panel design.
Why selected: It provides an additional Siemens/Murray option with clear installation support and a focus on safety.
Caution: Double-check your panel’s model and spacing to ensure compatibility with the listed range.
Buying Guide: Key Points for Choosing a Panel Interlock Kit
- Panel compatibility: Confirm the kit supports your exact panel brand and model (Square D QO/Homeline, Eaton BR, GE, Siemens/Murray).
- Spacing requirements: Interlock kits specify the gap between main and generator breakers. Measure your panel’s space to ensure fitment (common ranges include 1/4″ to 1 3/8″).
- Installation ease: Look for included hardware, drill bits, manuals, and clearly labeled steps to minimize installation time.
- Safety features: Ensure the kit prevents backfeed and simultaneous energizing of mains and generator lines.
- Best-use scenario: Choose based on your panel family (Square D for QO/Homeline, GE, Siemens/Murray, or Eaton BR) to minimize mismatch risks.
- Limitations: Some panels require professional installation or accessory compatibility checks; read the manufacturer notes for each kit.
FAQ
- What is a generator interlock kit?
It is a safety device that prevents backfeeding by locking the main and generator breakers in a way that only one can be energized at a time. - Do interlock kits work with all panel brands?
No. Each kit is designed for specific panel families (Square D, GE, Siemens/Murray, Eaton BR) and must match your panel’s model and spacing. - Is installation difficult?
Installation ranges from straightforward to moderately skilled, often requiring basic drilling and manual reading. Some panels may require professional assistance. - Which kit should I choose for GE panels?
If you have GE 150/200 A panels, select a GE-compatible GE interlock kit with the correct spacing (1 1/4″ is common). - What spacing should I expect?
Spacing usually falls around 7/8″ to 1 1/4″ or 1 3/8″ depending on the model and panel family. - Can I use multiple interlock brands?
It’s best to stick with the interlock kit designed for your specific panel to ensure proper alignment and safety.