Best Interlock Kits for Generators: Safe and Reliable Backfeeding Solutions
Choosing the right interlock kit is essential for safely connecting a portable generator to your home. The following products are among the top-rated options for different panel brands and amperage ratings. They help prevent backfeeding, protect appliances, and ensure a smooth transition between utility power and generator power during outages.
| Product | Brand | Panel Type | Interlock Spacing | Notes |
|---|---|---|---|---|
| Natupal Generator Interlock Kit | Natupal | Square D QO/Homeline 150/200A | 1 3/8 inches | Compatible with SD200A models |
| EXCELFU Generator Interlock Kit (Eaton BR) | EXCELFU | Eaton Cutler Hammer BR 150/200A | 1 1/4 – 1 7/16 inches | Safe, reliable backfeed for BR series |
| Siemens/Murray Generator Interlock | XMK | Siemens/Murray 150/200A | 7/8 – 1 1/4 inches | Prevents simultaneous mains and generator power |
| QYZZRS Square D Interlock Kit | QYZZRS | Square D QO/Homeline 150/200A | 1 3/8 inches | Professional installation kit |
| EXCELFU GE Interlock Kit | EXCELFU | General Electric GE 150/200A | 1 1/4 inches | Backfeeds safely for GE panels |
Natupal Interlock Kit For Square D And Homeline
The Natupal interlock kit is designed for Square D QO or Homeline panels rated at 150 or 200 amps. It requires a spacing of 1 3/8 inches between the main and generator breakers. The kit focuses on safe, controlled generator connection to power essential circuits during outages.
EXCELFU Interlock Kit For Eaton BR Series
EXCELFU offers a generator interlock kit compatible with Eaton/Cutler Hammer BR and CH series. It provides a safe, cost-effective backfeed solution for 150 and 200 amp panels. Spacing is adjustable from about 1 1/4 to 1 7/16 inches, helping ensure proper alignment and operation.
XMK Siemens/Murray Interlock Kit
Designed for Siemens or Murray 150/200 amp panels, the XMK interlock kit features spacing from 7/8 to 1 1/4 inches. It prevents backfeed once installed and directs generator power to selected circuits, supporting safe operation during outages.
QYZZRS Square D Interlock Kit
QYZZRS provides a professional interlock kit for Square D QO and Homeline panels at 150 or 200 amps. The kit requires 1 3/8 inches spacing between the main and generator breakers and emphasizes precise installation to ensure reliable backup power.
QYZZRS Eaton BR Series Interlock Kit
Another option from QYZZRS, this interlock kit is meant for Eaton Cutler Hammer BR and CH series 150/200 amp panels. It supports spacing from 1 1/4 to 1 7/16 inches. Installation guidance emphasizes aligning screws and test fittings to reduce errors.
XMK Interlock Kit For Square D 100/125A
Designed for Square D QO or Homeline 100/125 amp panels, this kit uses a spacing of 3/4 to 7/8 inches between main and branch breakers. It provides a cost-effective way to backfeed during outages while maintaining safety for household appliances.
XMK Eaton 100/125A BR Interlock Kit
For Eaton Cutler Hammer BR 100/125 amp panels, this interlock kit positions the main and adjacent branch breakers with a safe horizontal throw. Spacing and installation notes emphasize confirming model numbers and alignment for reliable use during outages.
Buying Guide: Key Considerations And Comparisons
- Panel compatibility: Verify your panel brand and model (Square D QO/Homeline, Eaton BR/CH, Siemens/Murray) and ensure the kit supports 150 or 200 amp configurations if needed.
- Breaker spacing: Most kits specify spacing between main and generator/brarrow breakers (common ranges include 1/4″ to 1 3/8″). Measure your panel exactly and match the kit’s requirements.
- Installation complexity: Some kits require pre-installation test fitting and screw alignment. Consider whether you want a kit with straightforward guidance or one that permits professional installation.
- Safety features: A good interlock kit prevents simultaneous mains and generator power, reducing backfeed risks and protecting appliances and personnel.
- Outdoor vs indoor use: Check enclosure suitability and weather resistance if you plan to place the kit outside the main panel.
- Warranty and support: Look for kits with clear documentation and responsive customer support in case of installation questions or panel compatibility concerns.
- Cost vs value: While prices vary, prioritize safety, correct spacing, and panel compatibility over cheapest options to avoid improper installation or backfeed issues.
- Future changes: If you anticipate upgrading panels or changing brands, select a kit with broad compatibility or plan for replacements that fit future setups.