Best Panel Interlock for Generator: Safe, Easy Backfeeding Solutions
Generator interlock kits help you safely backfeed power from a portable generator into your home’s electrical system, preventing dangerous backfeed to the utility and protecting appliances. This article reviews top panel interlock options compatible with popular brands such as Square D, GE, Siemens/Murray, Eaton, and more. Each product is evaluated for compatibility, spacing, and safety features to help you choose a kit that matches your panel and backup power needs.
| Product | Brand | Compatible Panels |
|---|---|---|
| Natupal Generator Interlock Kit SD200A | Natupal | Square D QO/Homeline 150/200 A |
| Excelfu GE 150/200 A Interlock Kit | EXCELFU | General Electric 150/200 A Panels |
| XMK Siemens/Murray 150/200 A Interlock | XMK | Siemens/Murray 150/200 A Panels |
| Excelfu Eaton BR 150/200 A Interlock | EXCELFU | Eaton Cutler Hammer BR/CH 150/200 A |
| QYZZRS Square D QO/Homeline 150/200 A Interlock | QYZZRS | Square D QO/Homeline 150/200 A |
Note: The list below focuses on five highly compatible options suitable for common residential setups. When selecting, verify spacing, screw positions, and model compatibility with your exact panel model and main breaker arrangement.
Natupal Interlock Kit SD200A For Square D Panels
Reference features: Compatible with Square D QO or Homeline 150/200 amp panels; requires 1 3/8 inch spacing between main and generator breaker; provides a safe interlock to direct generator power to home circuits and avoid simultaneous mains and generator operation. Built for professional-grade reliability and safety during outages.
EXCELFU GE Interlock Kit For 150/200 A Panels
Reference features: Compatible with GE 150/200 A panels; main breaker spacing of 1 1/4 inch; ensures that mains and generator do not power the system simultaneously; directs generator power to home circuits safely while protecting appliances during outages.
XMK Interlock Kit for Siemens/Murray 150/200 A
Reference features: Compatible with Siemens or Murray 150/200 A panels; spacing between main and branch breakers ranges from 7/8 to 1 1/4 inches; prevents simultaneous mains and generator power to protect appliances and maintain safety during outages.
EXCELFU Eaton BR Series Interlock Kit
Reference features: Compatible with Eaton/Cutler Hammer BR and CH series, 150/200 A; spacing between main and branch breakers ranges from 1 1/4 to 1 7/16 inches; provides a safe backfeed solution to power essential circuits while outages occur, without backfeeding to the utility.
QYZZRS Interlock Kit For Square D QO/Homeline 150/200 A
Reference features: Interlock kit for Square D QO and Homeline panels; spacing 1 3/8 inches between main and generator breaker; includes installation notes to align positioning accurately and avoid installation errors; designed for safe generator backfeeding and continued operation of essential circuits during outages.
Buying Guide: Key Purchase Considerations And Comparisons
Panel compatibility is the primary factor. Confirm your panel brand, series, and amperage (100/125/150/200 A) to ensure the interlock kit matches the exact model and spacing required.
- Spacing accuracy: Interlock kits specify exact main-to-generator breaker spacing (e.g., 1/4″, 7/8″, 1 1/4″, 1 3/8″). Use the spacing that your panel supports; improper spacing can compromise safety and function.
- Safety and reliability: Look for kits that effectively prevent both supplies from energizing simultaneously, protecting appliances and reducing backfeed risks during outages.
- Installation requirements: Some kits require additional drilling, screws, or pre-installation checks. Review the included instructions and ensure you have the necessary tools and safety measures in place.
- Panel type and environment: Indoor vs. outdoor suitability, panel accessibility, and compatibility with plug-on neutral vs. non plug-on neutral designs can influence which kit to choose.
- Brand and model matching: While many kits advertise broad compatibility, verify the exact panel model and main breaker arrangement to avoid fitment issues.
- Support and warranty: Consider kits from brands offering customer support and clear warranty terms in case of installation questions or issues during outages.
For a complete backup plan, pair an interlock kit with a properly sized portable generator and a well-planned circuit selection. Prioritize essential circuits—like lighting, refrigeration, and a few outlets—for reliability during power outages, while keeping total load within generator capacity and safe operation limits.