Best Generator Interlock Kit Options for Safe, NEC-Compliant Backfeeding
Protect your home during power outages with a safe, generator interlock kit designed for your panel. This guide highlights top interlock kits compatible with popular Square D, Eaton Cutler Hammer, and General Electric panels. Learn how spacing, installation notes, and model compatibility impact performance and safety. Each option is evaluated for ease of installation, safety features, and compatibility to help you choose the best fit for your home emergency power plan.
| Product | Brand | Panel Compatibility | Spacing (inches) |
|---|---|---|---|
| Generator Interlock Kit Compatible with Square D QO or Homeline 150/200 amp panels | Natupal | Square D QO/Homeline 150/200A | 1 3/8 |
| Generator Interlock Kit for Eaton Cutler Hammer BR Series 150/200A | EXCELFU | BR Series 150/200A | 1 1/4 – 1 7/16 |
| Generator Interlock Kit Compatible with Square D QO or Homeline 150/200A | QYZZRS | Square D QO/Homeline 150/200A | 1 3/8 |
| Generator Interlock Kit for Eaton Cutler Hammer BR 100/125A | XMK | BR 100/125A | 1 1/4 – 1 7/16 |
| Generator Interlock Kit for Eaton Cutler Hammer BR 150/200A | HUBRV | BR 150/200A | 1 7/16 – 1 1/4 |
Natupal Generator Interlock Kit for Square D QO/Homeline Panels
The Natupal interlock kit is designed for Square D QO or Homeline panels with 150 or 200 amp service. It provides a precise 1 3/8 inch spacing between the main breaker and the generator breaker, enabling safe backfeeding of a portable generator without simultaneous generator and utility power. This kit is positioned as a reliable solution for homeowners seeking NEC-compliant backfeed operation and seamless integration with existing panels. The included hardware and installation notes help guide correct positioning to minimize risk during generator use.
Key features
- Compatible with Square D QO or Homeline 150/200A panels
- Spacing: 1 3/8 inches between main and generator breaker
- Designed to safely direct generator power to home circuits during outages
EXCELFU Generator Interlock Kit for BR Series 150/200A
This interlock kit supports Eaton/Cutler Hammer BR series panels (including CH-series with plug-in neutral) for 150A and 200A service. It provides a safe, cost-effective means to prevent backfeeding while allowing a portable generator to power essential circuits during outages. The kit specifies a spacing range of 1 1/4 to 1 7/16 inches between main and branch breakers and emphasizes a single-handle, horizontal throw arrangement for straightforward operation.
Key features
- Compatible with BR Series and CH Series panels (150A/200A)
- Spacing: 1 1/4 to 1 7/16 inches
- Focus on safety and reliable generator backfeeding
QYZZRS Interlock Kit for Square D QO/Homeline 150–200A
QYZZRS offers a 1 3/8 inch spacing interlock kit compatible with Square D QO and Homeline panels at 150 and 200 amp ratings. Installation notes emphasize attaching screws to the interlock kit first and performing a test simulation to ensure accurate alignment before final mounting, reducing the risk of improper positioning and failed operation.
Key features
- Compatible with Square D QO and Homeline 150/200A
- Spacing: 1 3/8 inches
- Installation tips included for precise alignment
QYZZRS BR/CH Series Interlock Kit for 150/200A Eaton Panels
Designed for Eaton Cutler Hammer BR/CH series panels, this interlock kit supports 150A and 200A configurations. It specifies a spacing range of 1 1/4 to 1 7/16 inches between the main breaker and the branch breakers. The package includes installation guidance and emphasizes careful alignment to ensure reliable generator backfeeding while preventing simultaneous main and generator power.
HUBRV BR Series 150/200A Interlock Kit
The HUBRV interlock kit targets Eaton Cutler Hammer BR series panels, focusing on 150A and 200A installations. Spacing falls within 1 7/16 to 1 1/4 inches between the main breaker and the generator breaker. The kit is designed to prevent backfeed and ensure NEC-compliant operation, promoting safe use of a portable generator during outages while keeping household appliances powered.
SPZOCE BR/CH Interlock Kit for 150/200A Eaton Panels
SPZOCE offers an interlock kit compatible with Eaton/Cutler Hammer BR and CH series 150A/200A panels. The published spacing range is 1 1/4 to 1 7/16 inches between the main and branch breakers. The kit includes a 3/16-inch drill bit and installation manual, highlighting straightforward installation and safety benefits to backfeed power from a portable generator while preventing simultaneous main and generator operation.
QYZZRS General Electric 150/200A Interlock Kit
General Electric vertical main panels at 150A or 200A can benefit from this interlock kit, which specifies spacing between main and branch breakers from 2 1/2 to 3 1/2 inches. Installation notes stress aligning the interlock before drilling or fastening and highlight the safety transfer switch concept to prevent backfed power from causing hazards during outages.
Buying Guide: Interlock Kit Selection And Considerations
Choosing the right interlock kit involves understanding your panel type, amperage, and installation preferences. Consider these factors to ensure NEC compliance, safety, and reliability when using a portable generator during outages.
- Panel compatibility: Verify whether the kit supports Square D QO/Homeline, Eaton Cutler Hammer BR/CH, or GE vertical main panels. Mismatched kits can lead to improper installation or unsafe operation.
- Breaker spacing: Confirm the exact spacing required for your panel model (typical ranges are 1 1/4″ to 1 7/16″, or 1 3/8″ for some Square D kits). Correct spacing prevents overlap of main and generator breakers.
- Installation notes: Look for kits that provide step-by-step guidance, included hardware, and testing procedures to validate alignment before use.
- Safety compliance: Ensure the kit prevents simultaneous main and generator power, aligning with NEC guidelines and local codes to protect utility workers and household appliances.
- Ease of use: Some kits emphasize simple single-handle operation and clear labeling, making it easier to switch to generator power during an outage.
- Documentation and support: Availability of installation manuals, drill bits, and customer support can ease the installation process and troubleshoot issues.
- Future panel upgrades: If you plan to upgrade your panel, verify whether the chosen interlock kit remains compatible with potential panel changes.
- Cost considerations: Compare kit pricing relative to panel compatibility and installation complexity to determine long-term value without compromising safety.
When planning installation, it may be helpful to consult a licensed electrician to confirm panel compatibility and to ensure the interlock kit is installed in accordance with local electrical codes and electrical service requirements. This approach helps safeguard your home, family, and property during power outages.