Choosing the right generator interlock kit helps keep your home powered safely during outages by preventing backfeed and ensuring only one power source feeds your circuits. This guide highlights five reliable options for popular panel brands and models, with clear spacing specifications and installation notes. Use the quick comparison table below to narrow your choices before exploring individual product details.
| Product | Brand | Panel Compatibility | Spacing | Key Benefit |
|---|---|---|---|---|
| Generator Interlock Kit (SD200A) | Natupal Store | Square D QO/Homeline 150/200 A | 1 3/8 inches | Adds safe generator transfer for main/backup power |
| BR Series Interlock Kit | Unbranded | Eaton Cutler Hammer BR/CH 150/200 A | 1 1/4 – 1 7/16 inches | Backfeed prevention for emergency power |
| QO/Homeline Interlock Kit 1 | QYZZRS Store | Square D QO/Homeline 150/200 A | 1 3/8 inches | Professional interlock for reliable operation |
| GE 150/200 Amp Interlock | Not listed | General Electric GE 150/200 A | 1 1/4 inches | Compliance with NEC and utility safety |
| Square D QO/Homeline Lockout Kit | Unbranded | Square D QO/Homeline 150/200 A | 1 3/8 inches | Durable construction for long-term use |
Note: The table consolidates panel compatibility and spacing data drawn from the listed product features to help you compare at a glance. Always verify exact model fit before purchase and follow local electrical codes during installation.
Natupal Generator Interlock Kit for Square D QO or Homeline
The Natupal interlock kit supports Square D QO or Homeline panels with 150 or 200 amp ratings. It requires a 1 3/8 inch spacing between the main breaker and the generator breaker, enabling safe transfer of generator power to selected circuits. The kit is designed to prevent backfeeding, improving overall safety during power outages.
Eaton Cutler Hammer BR/CH Interlock Kit
This interlock kit is tailored for Eaton/Cutler Hammer BR and CH series panels across 150 and 200 amp configurations. It provides a safe, cost-effective solution for connecting a portable generator and minimizes backfeed risk by controlling the main and branch breaker positions. Typical spacing falls within 1 1/4 to 1 7/16 inches, aligning with common panel layouts.
QYZZRS Interlock Kit for Square D QO/Homeline
Designed for Square D QO and Homeline panels, this interlock kit specifies a 1 3/8 inch spacing between the main and generator breakers. Installation notes emphasize aligning the kit correctly before drilling, helping prevent misalignment that could affect performance. The kit aims to offer a robust, dependable path for safe generator operation during outages.
GE Interlock Kit for GE 150/200 Amp Panels
This interlock kit is compatible with General Electric GE 150 and 200 amp panels. It features a 1 1/4 inch spacing between main and branch breakers to prevent simultaneous operation of main power and generator. The design supports NEC compliance and protects utility workers from dangerous backfeed currents.
Square D QO/Homeline Generator Lockout & Interlock
Premium material construction supports reliable long-term use for Square D QO or Homeline 150–200 amp panels. The kit uses a 1 3/8 inch spacing between the main and generator breaker and includes installation aids designed to facilitate accurate alignment and mounting, reducing common setup errors.
Buying Guide: Key Considerations for Interlock Kits
- Panel compatibility: Verify that the interlock kit is specifically rated for your panel brand and model (Square D QO/Homeline, Eaton BR/CH, GE, etc.).
- Spacer measurements: Most kits specify spacing between the main and generator breakers (commonly 1 1/4 to 1 3/8 inches). Correct spacing is essential for safe operation and code compliance.
- Backfeed prevention: A primary function of interlock kits is to prevent backfeeding into the utility lines, protecting workers and equipment during outages.
- Installation prerequisites: Some kits require screws, drill bits, or alignment steps; follow manufacturer instructions to avoid installation errors.
- Compliance and safety: Ensure the kit complies with NEC guidelines (such as NEC 230.85 and related sections) and is installed by qualified personnel when required by code.
- Build quality and materials: Look for durable construction (metal components, robust fasteners) that withstand regular use and environmental exposure.
- Legacy vs. modern panels: Some interlock solutions are designed for older panels; verify future compatibility if you plan to upgrade.
- Emergency readiness: Consider how easily the generator can be connected and disconnected, especially in situations requiring quick response.
When selecting an interlock kit, balance compatibility, safety features, ease of installation, and long-term durability. Accurate installation, adherence to local codes, and periodic inspection help ensure the system delivers reliable, safe backup power when needed.