Best Generator Interlock Kits for Electrical Panels: Safe, Easy Backup Power
If you’re looking to safely back up essential circuits during outages, a generator interlock kit is a top choice. This article highlights five reliable options compatible with common panel brands and models, helping you pick the right fit for your home. The best buyers are DIY enthusiasts seeking safer generator integration and homeowners who want uninterrupted power to critical loads without backfeeding. The following table summarizes the selected products for quick comparison.
| Product | Brand | Panel Compatibility | Spacing (inches) |
|---|---|---|---|
| Natupal Generator Interlock Kit | Natupal | Square D QO/Homeline 150/200 A | 1 3/8 |
| Generator Interlock Kit for BR/CH Series | EXCELFU | Eaton Cutler Hammer BR/CH 150/200 A | 1 1/4 – 1 7/16 |
| Siemens/Murray Interlock Kit | XMK | Siemens/Murray 150/200 A | 7/8 – 1 1/4 |
| BR Series 150/200 A Interlock Kit | SPZOCE | Eaton/Cutler Hammer BR/CH 150/200 A | 1 1/4 – 1 7/16 |
| GE 150/200 A Interlock Kit | QYZZRS | GE General Electric 150/200 A | 1 1/4″ |
Natupal Interlock Kit For 150/200 A Panels
Compatible Models: Square D QO or Homeline 150/200 A panels. The kit requires 1 3/8 inch spacing between the main and generator breaker. This interlock directs generator power to any circuit while preventing simultaneous mains and generator feeds. Best for homeowners with Square D panels who want a straightforward, professional-grade connection.
Best for: DIY homeowners who own Square D QO or Homeline panels and want a tested, compact interlock solution. It helps maintain access to essential appliances during outages without backfeeding.
Caution: Verify exact model and spacing before purchase to avoid misfit. Improper alignment can compromise operation.
EXCELFU Generator Interlock Kit For BR/CH Series
Compatible Models: Eaton Cutler Hammer BR/CH 150/200 A panels. Spacing between main and branch breakers is 1 1/4 to 1 7/16 inches. The kit supports safe backfeeding of home appliances via a portable generator. Best for users who rely on Eaton panels and need a robust, installer-friendly option.
Best for: Homes with BR/CH panels seeking a cost-effective, reliable interlock with clear installation guidance. It’s a solid choice for emergency backup power sequences.
Caution: Ensure the panel model matches BR/CH and that the neutral configuration aligns with the kit’s design for plug-in neutral variants.
XMK Interlock Kit For Siemens/Murray Panels
Compatible Models: Siemens/Murray 150/200 A panels. Spacing between main and branch breakers ranges from 7/8 to 1 1/4 inches. The interlock safely prevents simultaneous mains and generator power, directing generator output to household circuits. Best for Siemens or Murray panel owners seeking a compact, compatible kit.
Best for: Homes with Siemens/Murray panels that need a compact, space-conscious interlock solution. Choose this if your spacing falls within the specified range.
Caution: Check exact spacing against your panel’s main breaker distance to confirm compatibility before buying.
SPZOCE BR Series Interlock Kit
Compatible Models: Eaton/Cutler Hammer BR series 150/200 A (with plug-in neutral) and CH series (with plug-in neutral). Spacing is 1 1/4 to 1 7/16 inches between main and branch breakers. Installation includes a drill bit and detailed manual. Best for BR/CH panel users who want a well-supported, professional interlock kit.
Best for: Homeowners who prefer a kit with included installation tools and explicit guidance. Better for those with BR/CH panels needing a reliable interlock solution.
Caution: Confirm panel model supports plug-in neutral variants before purchase.
QYZZRS GE General Electric Interlock For 150/200 A
Compatible Models: GE General Electric 150/200 A panels. Spacing between main and branch breakers is 2 1/4 inches. The interlock prevents simultaneous mains and generator power, directing generator output safely across circuits. Best for GE panel owners seeking a straightforward solution with explicit spacing requirements.
Best for: GE panel users who require a larger spacing option and a robust interlock mechanism. Choose this if your GE panel spacing matches 2 1/4 inches.
Caution: Verify spacing against your GE panel’s main-to-branch distance before purchasing to avoid fit issues.
Buying Guide: Key Considerations For Your Interlock Kit Purchase
- Panel compatibility: Confirm your panel brand and model family (Square D, Eaton/Cutler Hammer, Siemens/Murray, GE) and the correct amp rating (most kits target 150/200 A).
- Breaker spacing: Check the exact distance between the main and branch breakers on your panel. Interlock kits specify a range (for example, 1/4 in, 7/8 in, 1 3/8 in, etc.). Mismatched spacing can prevent installation or operation.
- Neutral handling: Some kits are designed for plug-in neutral variants. Ensure your panel configuration matches the kit’s neutral requirements.
- Installation support: Look for kits that include installation hardware (drill bits) and comprehensive manuals. This reduces the risk of misalignment during setup.
- Safety and compliance: An interlock kit should prevent backfeeding and simultaneous mains/generator power, protecting household circuits and utility personnel.
- Wiring complexity: Some kits involve more intricate alignment and testing steps. Assess your comfort level with electrical work and consider professional assistance if needed.
FAQ: Quick Answers For Buyers
- What is a generator interlock kit used for?
It helps safely connect a portable generator to your home’s electrical system by preventing both mains and generator power from flowing to the panel at the same time.
- Do interlock kits fit all panel brands?
No. Each kit is designed for specific panel brands and models. Check compatibility before purchasing.
- Is professional installation required?
Not always, but installation involves high-voltage connections. If you’re unsure, hire a licensed electrician for safety and code compliance.
- How do I verify the correct spacing for my panel?
Open your panel and measure the distance between the main breaker and the nearest branch breaker. Compare with the kit’s stated spacing.
- Can I use multiple interlocks in the same panel?
Generally, no. A single properly installed interlock is designed to cover the main and generator connections safely.
- What safety benefits does an interlock provide?
It eliminates backfeeding into the utility grid, protects appliances, and reduces shock risk during generator use.