Best Breaker Interlock Kits for Generator Panels: Safe, Easy Power Backup
When backing up your home with a portable generator, a breaker interlock kit ensures safe, code-compliant operation. The right interlock prevents simultaneous mains and generator power, reducing the risk of backfeeding and electrical faults. This article highlights top options for Square D QO/Homeline, Eaton Cutler-Hammer BR/CH, General Electric GE, and other popular panels. Each kit is selected for compatibility, ease of installation, and reliable performance during outages.
| Product | Brand | Key Feature |
|---|---|---|
| Natupal Generator Interlock Kit SD200A | Natupal | 1 3/8″ spacing; Square D QO/Homeline compatibility |
| EXCELFU BR SERIES Interlock Kit (150/200A) | EXCELFU | 1 1/4″–1 7/16″ spacing; Eaton Cutler Hammer BR/CH compatibility |
| QYZZRS Interlock Kit for BR/CH Series | QYZZRS | 1 1/4″–1 7/16″ spacing; comprehensive hardware included |
| EXCELFU GE 150/200A Interlock Kit | EXCELFU | 1 1/4″ spacing; GE panels compatible |
| MOWABI Interlock Kit for Square D QO/Homeline | MOWABI | 1 3/8″ spacing; premium materials and easy installation |
Natupal SD200A Interlock Kit for Square D QO/Homeline
The Natupal interlock kit is designed for Square D QO and Homeline 150/200 amp panels. It requires 1 3/8 inch spacing between the main and generator breakers. The kit provides a safe way to backfeed with a portable generator while preserving access to electrical appliances during outages. The kit’s design focuses on straightforward installation and reliable operation, integrating with standard Square D panel layouts.
EXCELFU Interlock Kit for Eaton BR Series 150/200A
This interlock kit supports Eaton Cutler Hammer BR/CH series 150 and 200 amp panels. It provides a safe, cost-effective method for backfeeding with a portable generator, helping keep essential circuits online during power outages. The kit specifies precise spacing between the main breaker and the branch breakers (1 1/4″ to 1 7/16″), and includes clear installation guidance for reliable performance.
QYZZRS Interlock Kit for Square D and Eaton BR/CH (1 Set)
QYZZRS offers an interlock kit compatible with Eaton Cutler Hammer BR series as well as other BR/CH configurations. The kit includes an interlock plate, screws, drill bit, and start-up labeling materials. Installation notes emphasize aligning the interlock accurately before securing screws, reducing the risk of misalignment and installation errors while ensuring safe operation during generator use.
EXCELFU GE Interlock Kit for 150/200A Panels
Designed for General Electric GE panels in 150/200 amp configurations, this interlock kit uses a 1 1/4 inch spacing between the main breaker and the branch breakers. It aims to safely isolate the main from the generator circuit, ensuring uninterrupted operation of selected home circuits during outages. The kit emphasizes reliable materials and a straightforward installation process, suitable for homeowners and professionals alike.
MOWABI Generator Interlock Kit for Square D QO/Homeline
The MOWABI interlock kit is tailored for Square D QO or Homeline 150–200 amp panels. It specifies a 1 3/8 inch spacing and uses premium materials to resist bending or warping, supporting a robust, long-lasting installation. The kit includes drilling and assembly components to facilitate a straightforward setup, helping ensure safe generator integration with your panel.
Buying Guide
Key considerations when choosing a breaker interlock kit:
- Panel compatibility: Confirm your panel brand and model (Square D QO/Homeline, Eaton Cutler Hammer BR/CH, GE) before selecting a kit. Mismatches can impair safety and operation.
- Spacing and fit: Most kits specify a spacing range (e.g., 1 1/4″, 1 3/8″, or up to 1 7/16″). Ensure your main and generator breakers accommodate the spacing to avoid interference or misalignment.
- Installation difficulty: Some kits include drilling bits, screws, and step-by-step instructions. Assess your comfort with basic electrical work or consider professional installation.
- Material quality: Look for kits with durable aluminum components and corrosion-resistant fasteners for long-term reliability in varying weather conditions or indoor environments.
- Included hardware: Check whether the kit provides all required screws, drill bits, labels, and start-up procedures to simplify setup.
- Safety features: A proper interlock prevents both mains and generator power from being ON simultaneously, reducing backfeed risks and protecting utilities and appliances.
- Code compliance: Ensure the kit aligns with local electrical codes and manufacturer instructions to support safe, compliant generator backfeeding.
- Future compatibility: If you anticipate panel upgrades or changes, selecting a kit with broader compatibility can simplify future maintenance.
Comparisons across brands show trade-offs between installation complexity and hardware inclusions. For most homeowners, a kit that clearly specifies panel compatibility, precise spacing, and includes all installation components offers the best balance of safety and ease of use. Professionals may opt for kits with premium materials and broader support across BR/CH or QO/Homeline families for versatility on multi-panel projects.