Best Interlock System for Generator: Safe, Reliable Backfeed Solutions
The following article highlights the best interlock kit options for generator backfeeding across popular panel brands. Each product is designed to prevent simultaneous power from mains and generator sources, ensuring safe operation during outages. The selections focus on 150–200 amp panels and provide clear spacing requirements to fit common breaker configurations.
Summary of chosen products
| Product | Brand | Panel Compatibility | Spacing (approx.) | Key Benefit |
|---|---|---|---|---|
| Natupal Generator Interlock Kit – Square D QO/Homeline | Natupal | Square D QO / Homeline 150–200 A | 1 3/8 inch | Trusted for reliable interlock between main and generator breakers. |
| EXCELFU Generator Interlock Kit – Eaton Cutler Hammer BR/CH | EXCELFU | Eaton BR/CH 150–200 A | 1 1/4 – 1 7/16 inches | Safe backfeed with straightforward installation. |
| XMK Generator Interlock Kit – Siemens/Murray | XMK | Siemens/Murray 150–200 A | 7/8 – 1 1/4 inches | Cross-brand compatibility for common panels. |
| EXCELFU GE Interlock Kit – General Electric | EXCELFU | GE 150–200 A | 1 1/4 inch | Solid safety and reliable switching. |
| QYZZRS Eaton BR Series Interlock – 150/200 A | QYZZRS | Eaton BR 150–200 A | 1 ¼ – 1 7/16 inches | Professional interlock with included hardware. |
Natupal Interlock Kit for Square D QO/Homeline Panels
This interlock kit is designed to install between the main and generator breakers on Square D QO or Homeline panels rated at 150 or 200 amps. It specifies a 1 3/8 inch spacing requirement, ensuring proper alignment of the interlock plate with the generator breaker. The kit helps direct generator power to circuits safely, reducing the risk of backfeeding during outages. Installation typically involves verifying model compatibility and aligning screws to ensure a secure fit. Use in households seeking a dependable generator connection without backfeed hazards.
EXCELFU Interlock Kit for Eaton BR/CH Panels
This kit provides a safe method to backfeed your home using a portable generator with Eaton BR or CH series panels (150–200 A). It specifies a spacing range of 1 1/4 to 1 7/16 inches between the main and branch breakers. The product emphasizes a horizontal main breaker position and a one-handed operation design for reliable switching. It is suitable for power outages and emergency backup power, helping maintain essential appliances while preventing simultaneous energization of mains and generator sources.
XMK Interlock Kit for Siemens or Murray Panels
The XMK interlock kit supports Siemens or Murray panels rated at 150 or 200 amps. It specifies a spacing range from 7/8 inch to 1 1/4 inches, so users must confirm model compatibility and spacing before ordering. The interlock prevents both mains and generator power from flowing at the same time, directing generator power safely to household circuits during outages. It is designed to keep essential appliances operational while maintaining a robust safety margin.
EXCELFU Interlock Kit for GE 150/200 Amp Panels
This product is designed for General Electric GE panels at 150 or 200 amps. It features a 1 1/4 inch spacing between the main breaker and branch breakers to ensure safe operation. The interlock prevents simultaneous energization from the main and generator, enabling reliable power during outages. The kit emphasizes safety and reliability while accommodating common GE panel configurations, making it a practical choice for households with GE equipment needing backup power readiness.
QYZZRS Interlock Kit for Eaton BR Series 150/200 A
The QYZZRS interlock kit is compatible with Eaton Cutler Hammer BR series panels rated at 150 and 200 amps. It specifies a spacing range of 1 ¼ to 1 7/16 inches between the main and generator breakers. Installation notes often recommend pre-fitting screws and simulating operation to ensure proper alignment. The kit aims to prevent both mains and generator power from flowing at once, safeguarding household circuits during outages while enabling safe generator use.
Natupal Interlock Kit – Updated Square D QO/Homeline
Natupal’s updated interlock kit supports Square D QO or Homeline panels at 150 or 200 amps. It requires a 1 3/8 inch spacing between the main and generator breaker. The kit is designed to safely direct generator power to circuits within the home during outages, ensuring access to essential appliances. The updated version emphasizes user-friendly installation and compatibility with common Square D panels for reliable emergency power solutions.
Natupal Square D QO/HOM 150/200 Amp – Updated
This Natupal interlock kit is compatible with Square D QO and Homeline 150 or 200 amp panels, featuring a 1 3/8 inch spacing between the main and branch/generator breaker. The kit focuses on safe generator integration, enabling you to backfeed selected circuits without risking backfeeding or backflow to the utility grid. It is designed for installers seeking a dependable, straightforward solution for emergency power readiness in Square D installations.
Buying Guide: Key Considerations For Choosing An Interlock Kit
- Panel compatibility: Confirm that the interlock kit matches your panel brand and model (Square D QO/Homeline, Eaton BR/CH, Siemens/Murray, GE, etc.) and supports 150–200 amp services.
- Spacing requirements: Verify the exact spacing between the main and generator/branch breakers (common ranges include 1/4 inch to 1 3/8 inches). Incorrect spacing can prevent proper operation or cause fit issues.
- Installation feasibility: Some kits require pre-installation steps, alignment checks, or additional hardware. Ensure you have the tools and skills, or hire a licensed electrician.
- Safety and compliance: The primary purpose is to prevent backfeeding to the utility grid. Look for kits that meet standard electrical safety requirements and come with clear instructions.
- Hardware and inclusions: Check what’s included (plate, screws, drill bits, labels). Some listings provide extra items to facilitate installation and labeling for future maintenance.
- Cost vs. value: While prices aren’t shown here, evaluate total cost against reliability, ease of installation, and panel compatibility to determine long-term value.
- Warranty and support: Favor options with reasonable warranties and accessible customer support in case of fit or operation questions.
- Future-proofing: If you anticipate panel upgrades, select a kit with broad compatibility or a straightforward replacement path to minimize future changes.