Best Generator Interlock Kits for 150/200 Amp Electrical Panels
When safeguarding a home against power outages, a generator interlock kit is a critical component for safe, code-compliant switching between utility power and generator power. This guide highlights five trusted interlock kits that fit common 150/200 amp panels from GE, Eaton, Siemens/Murray, Bryant, and Square D. Each option is designed to prevent parallel energizing of mains and generator lines while ensuring reliable transfer to essential circuits. The selections below emphasize compatibility, installation clarity, and durable construction to support long-term home resilience.
| Product | Brand | Compatibility | Key Spacing |
|---|---|---|---|
| GE 150/200 Amp Interlock Kit | EXCELFU | GE 150/200 Amp Panels | 1 1/4 in |
| Eaton BR Series Interlock Kit | EXCELFU | Eaton Cutler Hammer BR 150/200 Amp | 1 1/4 – 1 7/16 in |
| Siemens/Murray Interlock Kit | XMK | Siemens/Murray 150/200 Amp | 7/8 – 1 1/4 in |
| GE Vertical Main Interlock | Flngr | GE Vertical 150/200 Amp Panels | 2 1/4 in |
| Square D / Bryant Interlock | Natupal | Square D QO/Homeline 150/200 Amp | 1 3/8 in |
GE 150/200 Amp Interlock Kit
The GE interlock kit from EXCELFU is designed for General Electric panels rated at 150 or 200 amps. It provides a precise 1 1/4 inch spacing between the main and branch breakers to ensure safe, simultaneous disconnection of the mains and generator sources. This arrangement prevents backfeeding and supports a safe transfer to household circuits during outages. The kit’s design emphasizes reliable operation with GE panels and aims to simplify field installation for homeowners or electricians, offering a dependable solution for winter storm preparedness and emergency readiness.
Eaton BR Series Interlock Kit
This interlock kit supports Eaton Cutler Hammer BR series panels, including BR and CH lines, with a 150/200 amp rating. It specifies a horizontal main breaker throw and a spacing range of 1 1/4 to 1 7/16 inches between the main and branch breakers. The design enables a safe backfeed management so that generators can power selected circuits while the main power remains isolated. It is positioned as a cost-effective, dependable option for users seeking rapid installation and consistent performance during outages.
Siemens/Murray Interlock Kit
Designed for Siemens and Murray 150/200 amp panels, this interlock kit features a 7/8 to 1 1/4 inch spacing between the main and branch breakers. It emphasizes safe switching to generator power while ensuring that the mains and generator do not energize simultaneously. By providing a robust interlock mechanism, this option supports reliable operation during outages and is suitable for homes with Siemens or Murray panel installations. Installation considerations include verifying model compatibility and correct spacing to ensure proper function.
GE Vertical Main Interlock
Flngr’s interlock kit targets General Electric vertical main panels rated at 150 or 200 amps. It provides a 2 1/4 inch spacing between the main and branch breakers, emphasizing robust construction and corrosion-resistant aluminum alloy materials. The kit is designed to mount on the front of the panel, offering a straightforward installation pathway while prioritizing electrical insulation and safe operation. Ideal for those seeking a high-durability option for GE vertical configurations, particularly in outdoor or challenging environments where weather exposure is a concern.
GE Interlock Kit For 150/200 Amp (SPZOCE)
SPZOCE’s generator interlock kit is compatible with GE 150/200 amp panels and specifies a 1 1/4 inch spacing between the main and branch breakers, with easy installation using included hardware and a detailed manual. The safety focus is on preventing simultaneous energization of mains and generator lines, ensuring that power outages do not disrupt essential appliances. It targets GE panels with straightforward compatibility and a practical approach to installation for homeowners and professionals alike.
Natupal Square D Interlock Kit
Natupal’s interlock kit is tailored for Square D QO or Homeline 150/200 amp panels, with a convenient 1 3/8 inch spacing between the main and generator breaker. It emphasizes professional-grade construction and reliable interlock operation to safely route generator power to selected circuits. The design focuses on safety, ensuring that the generator cannot backfeed into the utility line while enabling continued operation of essential loads during outages. This option is suitable for homes using Square D panels seeking robust, field-proven performance.
Buying Guide
Key purchase considerations help determine the right interlock kit for a home’s electrical system:
- Panel compatibility: Verify that the interlock kit is listed for your panel brand and model (GE, Eaton, Siemens/Murray, Bryant, Square D, etc.).
- Breaker spacing: Confirm the required spacing between main and generator breakers (common values include 1 1/4″, 1 3/8″, 7/8″, and 2 1/4″). Mismatched spacing can prevent safe operation or violate code requirements.
- Operating mechanism: Determine whether the interlock uses a horizontal or vertical throw, and how the main and generator positions are adjusted during transfers.
- Durability and materials: Look for aluminum or corrosion-resistant components, reinforced mounting hardware, and robust anodization or protective coatings for longevity in various environments.
- Installation complexity: Some kits include installation bits, manuals, and templates. Consider whether you need professional installation or if you’re confident installing a panel accessory safely.
- Safety and code compliance: Ensure the kit complies with relevant electrical codes and labeling requirements for backfeeding protection and interlock operation.
- Backfeed protection coverage: Confirm that the kit prevents simultaneous mains and generator energization and directs generator power to critical loads without backfeeding the utility line.
When choosing among options, compare compatibility with your panel brand, required spacing, and whether the kit supports horizontal vs. vertical main throws. For homes with outdoor or challenging installation sites, consider kits with rugged housings and corrosion-resistant materials. Finally, assess whether the included installation tools and manual will streamline the process or if professional installation is preferred to ensure compliance and safety.