Best Interlock Device For Generator: Compare Panel Compatibility

#1 · Best Overall

1. Natupal SD200A

• Material Type: steel
• Material: steel

Best for: Square D QO and Homeline panels.

Why it ranks #1: Fits Square D QO or Homeline 150- and 200-amp panels with 1 3/8-inch spacing; the listed package includes a drill bit, instructions, and labels.

A 1 3/8-inch breaker spacing requirement is the key fit detail for this Natupal interlock kit, which is listed for Square D QO or Homeline 150- and 200-amp panels. It lets compatible-panel owners route portable-generator power to home circuits while the interlock supports safe source selection.

The listed QO and Homeline compatibility narrows the intended panel family, while the 1 3/8-inch spacing gives buyers a concrete layout check before installation. The kit includes a drill bit, instruction bulletin, start-up procedure label, and reminder labels, bringing setup guidance and operating reminders together. Its interlock plate, shoulder screws, and hex nuts are the core hardware; check the panel model and breaker spacing against the specified requirements before proceeding.

Skip it if you have a Siemens or Murray panel; the SPZOCE SP-SM200 is listed for those panel families.

Choose this Natupal kit when your Square D QO or Homeline panel is rated 150 or 200 amps and has the specified 1 3/8-inch spacing. Its fit depends on matching both panel family and breaker layout.

Listed on Amazon as: Generator Interlock Kit Compatible with Square D QO or Homeline 150 or 200 amp panels. 1 3/8 inches Spacing between main and generator breaker, Professional and Interlock Kit (SD200A)

#2 · Stainless Steel

2. QYZZRS DDA-01

• Material Type: Stainless Steel
• Material: Stainless Steel

Best for: Stainless-steel Square D option.

Why it ranks #2: Targets Square D QO and Homeline 150- and 200-amp panels at 1 3/8-inch spacing, with stainless-steel construction listed.

Stainless-steel construction and a 1 3/8-inch spacing requirement define this QYZZRS interlock kit for Square D QO and Homeline 150- or 200-amp panels. Its installation note recommends attaching the screws first and simulating operation to help align the kit before final positioning.

The specified QO and Homeline panel families and 1 3/8-inch spacing provide two practical fit checks before work begins. QYZZRS advises attaching the screws to the interlock first and simulating its use, a sequence intended to help align the installation and avoid positioning errors. Stainless-steel construction distinguishes its material specification, while the interlock is described for safely backfeeding a home from a portable generator.

Skip it if you have a GE panel; EXCELFU GK-PN300 is listed for GE 150- or 200-amp panels.

Choose this QYZZRS model if your Square D QO or Homeline panel is rated 150 or 200 amps and matches the spacing. Its screw-first simulation note may help guide alignment during installation.

Listed on Amazon as: Generator Interlock Kit Compatible with Square D QO

#3 · Labeled Kit

3. HUBRV H-gik-sd200sa

Best for: Square D Homeline meter-main panels.

Why it ranks #3: Designed for Square D 150- and 200-amp panels and lists a drill bit, mounting hardware, caution labels, and procedure labels.

This HUBRV interlock targets Square D Homeline meter-main panels rated 150 or 200 amps and includes a drill bit, mounting hardware, labels, and zip ties. Its mechanical interlock is intended to prevent backfeeding by blocking simultaneous main and generator breaker operation.

The Homeline meter-main specification is the key compatibility detail, distinguishing the intended application from a general Square D panel listing. Included screws, a drill bit, an instruction bulletin, start-up procedure labels, reminder labels, and zip ties bring installation hardware and operating prompts together. HUBRV also describes steel-forged lock bars that physically block simultaneous breaker activation, connecting the mechanism to source isolation during an outage.

Skip it if you have a Square D QO panel rather than a Homeline meter-main; Natupal SD200A is listed for QO panels.

Choose the HUBRV H-gik-sd200sa when your Square D Homeline meter-main panel is rated 150 or 200 amps. Its hardware and labels support setup, but the meter-main panel type is central to fit.

Listed on Amazon as: Generator Interlock Kit, Compatible with Square D Homeline Meter Main 150 or 200 amp Breaker for Safe Usage of Portable Power During Outage

#4 · Broad Spacing

4. HUBRV GIK-SM200

• Material Type: Aluminum
• Material: Aluminum

Best for: Siemens and Murray with included hardware.

Why it ranks #4: Fits Siemens or Murray 150- and 200-amp panels with 7/8- to 1 1/4-inch spacing; the package lists a drill bit and fixing straps.

A matching drill bit, two fixing straps, and installation and use instructions come with this HUBRV kit for Siemens or Murray 150- and 200-amp panels. Its stated 7/8- to 1 1/4-inch spacing provides a defined breaker-layout range for buyers to check.

The Siemens or Murray compatibility and 7/8- to 1 1/4-inch spacing range help narrow the fit check to both panel family and breaker layout. HUBRV lists a matching drill bit, two fixing straps, and instructions, supplying installation components alongside the interlock. Its described mechanical blocking prevents the main and generator breakers from being activated simultaneously, supporting source isolation when switching between utility and generator power.

Skip it if you have a Square D Homeline meter-main panel; HUBRV H-gik-sd200sa is listed for that panel type.

The HUBRV GIK-SM200 suits Siemens or Murray 150- or 200-amp panel owners who want listed installation hardware and instructions. Check that the breaker spacing falls within its specified range before proceeding.

Listed on Amazon as: Generator Interlock Kit Compatible with Siemens or Murray 150 and 200 amp Panels, Generator Horizontal Electrical Interlock Kit, 7/8-1 1/4" inches Spacing Between Main and GEN Breaker

#5

5. SPZOCE SP-SM200

• Material Type: Alloy Steel, Aluminum
• Material: Alloy Steel, Aluminum

Best for: Siemens and Murray panel owners.

Why it ranks #5: Covers Siemens or Murray 150- and 200-amp panels and a 7/8- to 1 1/4-inch spacing range, with a drill bit and installation manual.

A supplied 3/16-inch steel drill bit and detailed installation manual distinguish this SPZOCE kit for Siemens or Murray 150- and 200-amp panels. Its stated 7/8- to 1 1/4-inch breaker spacing gives owners a defined layout range to check when planning generator interlock installation.

The Siemens or Murray panel listing identifies the intended equipment, and the 7/8- to 1 1/4-inch spacing range helps buyers assess whether the breaker arrangement matches. SPZOCE includes a sturdy 3/16-inch drill bit and a detailed manual, supporting a more guided installation workflow. The kit is intended to direct generator power safely through the panel; verify the specific panel and spacing rather than relying on amperage alone.

Skip it if you have a 100-amp Siemens or Murray panel; XMK GK-009 is listed for those 100-amp panels.

This SPZOCE model suits owners of listed Siemens or Murray 150- or 200-amp panels who value an included drill bit and installation manual. The spacing must fall within its stated range for the intended layout.

Listed on Amazon as: Generator Interlock Kit Compatible with Siemens or Murray 150&200Amp Panels

#6 · Multi-Brand Fit

6. Natupal ITE-200A

Best for: ITE and related panel families.

Why it ranks #6: Fits listed ITE, Gould, Murray, Siemens, and Thomas and Betts 150- or 200-amp panels, provided the breakers are 1 1/4 inches apart.

Compatibility across ITE, Gould, Murray, Siemens, and Thomas and Betts panels sets this Natupal kit apart, with 1 1/4-inch spacing specified between the main and generator breakers. It supports directing portable-generator power to home circuits on compatible 150- or 200-amp panels.

The five named panel families make the compatibility list useful for owners whose equipment is not a Square D model, while the 1 1/4-inch spacing provides a specific layout check. The kit is described as a means of safely directing generator power to home circuits. Its residential recommendation and included interlock kit keep the intended application straightforward, but panel family, amperage, and breaker spacing all need to align.

Skip it if you have a Square D QO or Homeline panel; Natupal SD200A is listed for those families and their 1 3/8-inch spacing.

This Natupal kit suits owners of listed ITE, Gould, Murray, Siemens, or Thomas and Betts residential panels rated 150 or 200 amps. Confirm that the main-to-generator breaker spacing is 1 1/4 inches.

Listed on Amazon as: Generator Interlock Kit Compatible with ITE, Gould, Murray, Siemens, and Thomas and Betts, 150 or 200 amp panels, 1 1/4 Inch Spacing between main and generator breaker

#7

7. EXCELFU GK-PN300

• Material Type: Metal
• Material: Metal

Best for: GE 150- and 200-amp panels.

Why it ranks #7: Provides a GE-specific option for 150- or 200-amp panels and states 1 1/4-inch spacing between the main and branch breakers.

A 1 1/4-inch spacing specification anchors the EXCELFU GK-PN300 for General Electric 150- or 200-amp panels. Its interlock is intended to prevent mains and generator power from being supplied at the same time while directing generator power to household circuits.

The GE panel-family and amperage listing gives owners a defined compatibility target, while the 1 1/4-inch spacing helps assess the breaker arrangement. EXCELFU describes the kit as preventing simultaneous mains and generator supply, supporting source isolation during generator use. Its stated purpose of directing power to household circuits connects the panel interlock to home backup operation; the supplied information lists the kit but no installation accessories.

Skip it if you need a kit with a listed drill bit and manual; SPZOCE SP-GE3 includes both for its specified GE panel layout.

The EXCELFU GK-PN300 is for GE 150- or 200-amp panel owners whose breaker spacing matches 1 1/4 inches. Its listed purpose is household generator connection, while accessory details are not provided.

Listed on Amazon as: Generator Interlock Kit Compatible with General Electric GE 150 or 200 Amp

#8

8. SPZOCE SP-GE3

• Material Type: Alloy Steel, Aluminum
• Material: Alloy Steel, Aluminum

Best for: GE panels with vertical main.

Why it ranks #8: Fits GE panels with a single vertical main breaker and requires 2 1/2 inches between the main and nearest branch breaker.

A single vertical main breaker and 2 1/2-inch spacing define the GE panel layout for this SPZOCE interlock kit. It also includes a sturdy 3/16-inch drill bit and detailed installation manual, pairing a specific fit requirement with tools and guidance for installation.

Unlike a listing based only on panel amperage, this model identifies GE panels equipped with a single vertical main breaker and specifies 2 1/2 inches to the nearest branch breaker. That detail helps buyers assess the panel layout. The included steel drill bit and detailed manual support the installation workflow, while alloy steel and aluminum are the listed materials. Match the stated breaker arrangement before choosing this kit.

Skip it if you have a GE panel with 1 1/4-inch breaker spacing; EXCELFU GK-PN300 specifies that spacing for its GE model.

This SPZOCE kit fits GE panel owners whose equipment has a single vertical main and the stated 2 1/2-inch spacing. Its drill bit and manual are useful inclusions, but the layout requirement is specific.

Listed on Amazon as: Generator Interlock Kit Compatible with GE General Electric Breaker Panels

#9

9. XMK GK-009

• Material Type: aluminium alloy
• Material: aluminium alloy

Best for: 100-amp Siemens or Murray panels.

Why it ranks #9: Serves Siemens or Murray 100-amp panels, specifying 7/8-inch spacing for plug-on-neutral panels and 1 1/4 inches for non-plug-on-neutral.

Two spacing options make the XMK GK-009 specific to Siemens or Murray 100-amp panels: 7/8 inch for Plug on Neutral panels and 1 1/4 inches for non-Plug on Neutral panels. That distinction helps buyers match the interlock to their panel configuration before installation.

The separate spacing specifications for Plug on Neutral and non-Plug on Neutral panels help owners identify the correct layout rather than treating all 100-amp panels alike. Its two metal plates connect with two bolts, and the described movement blocks the generator backfeed breaker while allowing the main breaker. Laser-cut construction is stated to support accurate installation, and the listing says a separate generator panel is not required.

Skip it if you need a Siemens or Murray 150- or 200-amp kit; SPZOCE SP-SM200 is listed for those ratings.

Consider the XMK GK-009 for a Siemens or Murray 100-amp panel when its Plug on Neutral status and breaker spacing match the listing. Its two spacing options do not extend its stated rating beyond 100 amps.

Listed on Amazon as: Generator Interlock Kit for Siemens 100 Amp or Murray 100 Amp Panels

#10

10. Flngr CH-5

• Material Type: [Inferred: Steel, Aluminum, Cast Iron…
• Material: [Inferred: Steel, Aluminum, Cast Iron…

Best for: Eaton and Cutler Hammer vertical-throw panels.

Why it ranks #10: The listed fit is narrower: Eaton or Cutler Hammer CH-series 150- or 200-amp panels with a single vertical-throw main and 2 1/4-inch spacing.

A single vertical-throw main breaker and 2 1/4-inch spacing identify the intended fit for this Flngr kit, listed for Eaton or Cutler Hammer CH Series 150- or 200-amp panels. The interlock is meant to prevent mains and generator power from being supplied simultaneously.

The Eaton or Cutler Hammer compatibility is paired with a single vertical-throw main-breaker requirement, giving buyers a panel configuration to verify. Its 2 1/4-inch spacing specification adds a second layout check before installation. The kit is described as directing generator power to household circuits while preventing simultaneous mains and generator supply, making its stated role clear for residential outage use. Included components are listed as none, so accessory details are not supplied.

Skip it if you need an included drill bit and manual; SPZOCE SP-SM200 lists both for compatible Siemens or Murray panels.

This Flngr kit is for Eaton or Cutler Hammer CH Series panel owners with the specified vertical-throw main and 2 1/4-inch spacing. Its stated residential use is generator interlocking; supplied accessories are not listed.

Listed on Amazon as: Generator Interlock Kit Compatible with Eaton or Cutler Hammer Vertical Throw CH Series 150 or 200 amp, 2 1/4" Spacing Between Main and Branch Breakers