Best Interlock Device For Generator: Compare 10 Panel Fits

#1 · Best Overall

1. Natupal SD200A

• Material Type: steel
• Material: steel

Best for: QO and Homeline panel owners.

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

Compatibility with Square D QO or Homeline 150- and 200-amp panels is the Natupal SD200A’s defining feature, enabling generator connection through a matching panel. Its 1 3/8-inch spacing requirement gives buyers a concrete measurement to check before selecting the kit for a home backup setup.

The stated QO and Homeline compatibility narrows the fit to those Square D panel families, while the 1 3/8-inch gap between main and generator breakers provides a separate spacing check. The kit includes an interlock plate, shoulder screws, hex nuts, a drill bit, and an instruction bulletin, giving the installer listed hardware and guidance for the job. Its purpose is to direct portable-generator power to circuits through the panel; panel and breaker fit remain central considerations.

Skip it if you have a GE vertical-throw panel; XMK’s GE 150/200A kit addresses that panel family instead.

A practical candidate for owners of Square D QO or Homeline 150- or 200-amp panels who can verify the 1 3/8-inch breaker spacing. Its listed fit is limited to those panel families.

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 · Best Listed Option

2. Gen Interlock ITE-200A

• Material Type: Metal, Plastic
• Material: Metal, Plastic

Best for: Listed ITE-family panel owners.

Why it ranks #2: Covers ITE, Gould, Murray, and Siemens 150- or 200-amp panels, specifies 1 1/4-inch spacing, and lists MET lab listing E113887.

The Gen Interlock ITE-200A combines compatibility with Gould, ITE, Murray, Siemens, and Thomas and Betts panels with a Met lab listing, giving buyers named panel coverage and a stated listing credential. Its 1 1/4-inch spacing defines an important fit check.

Compatibility is specified for the named panel families at 150 or 200 amps, with 1 1/4 inches between the main and branch breakers. That lets buyers screen panel identity, rating, and spacing before installation. The kit includes labeling, a drill bit, and a generator breaker retainer strap in addition to the interlock, supporting a more complete installation workflow. The panel and breakers are not included, so existing equipment must meet the stated compatibility requirements.

Skip it if you have a Square D QO or Homeline panel; Natupal’s SD200A is listed for those Square D families instead.

A suitable option for owners of the named ITE-family panels who want the included labeling, drill bit, and retainer strap. Check the 150- or 200-amp rating and 1 1/4-inch spacing; panel and breakers are separate.

Listed on Amazon as: ITE-200A Gould, ITE or Siemens Generator Interlock Kit 150 amp or 200 amp Panels

#3 · Broad Panel Fit

3. Natupal ITE-200A

Best for: ITE and Siemens panel owners.

Why it ranks #3: Names ITE, Gould, Murray, Siemens, and Thomas and Betts 150- or 200-amp panels, with a defined 1 1/4-inch breaker spacing.

The Natupal ITE-200A covers ITE, Gould, Murray, Siemens, and Thomas and Betts 150- or 200-amp panels, making its broad named compatibility the key selection point. Its 1 1/4-inch breaker spacing requirement gives buyers a specific layout measurement to verify.

The listed panel families span ITE, Gould, Murray, Siemens, and Thomas and Betts, but the fit still depends on a 150- or 200-amp rating and 1 1/4 inches between the main and generator breakers. That combination helps buyers screen both panel identity and layout before installation. The kit is presented for residential generator connection, directing generator power through the panel to home circuits. The supplied details identify the interlock kit but do not enumerate additional installation hardware.

Skip it if you have a Square D QO or Homeline panel; Natupal’s SD200A kit is specified for those Square D families instead.

This is suited to owners of the named ITE-family panels who need a residential generator interlock and have the required 1 1/4-inch spacing. Confirm the panel family and rating before selecting it.

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

#4 · Best GE Fit

4. SPZOCE SP-GE200

• Material Type: Metal
• Material: Metal

Best for: GE panel DIY installers.

Why it ranks #4: Targets GE 150- or 200-amp panels and specifies 1 1/4-inch spacing; it also lists a 3/16-inch drill bit and installation manual.

A supplied 3/16-inch steel drill bit and detailed installation manual distinguish SPZOCE’s GE interlock kit, giving installers both a specified tool and written guidance. It is listed for General Electric 150- or 200-amp panels with 1 1/4 inches between main and branch breakers.

The compatibility statement identifies GE 150- or 200-amp panels and a 1 1/4-inch distance between main and branch breakers, giving buyers two concrete fit checks. For the installation workflow, the included 3/16-inch steel drill bit and detailed manual provide the named tool and instructions described in the listing. The kit is intended to direct generator power safely to home circuits through the panel. Its stated scope is GE panels, not a range of other brands.

Skip it if you need an interlock for a GE panel with 2 1/4-inch spacing; XMK’s GE vertical-main kit specifies that spacing.

This fits GE 150- or 200-amp panel owners whose main-to-branch spacing is 1 1/4 inches. The included drill bit and manual suit buyers who value supplied installation guidance, within that fit boundary.

Listed on Amazon as: Generator Interlock kit for General Electric GE 150/200 Amp Panels

#5

5. XMK GE Vertical

• Material Type: aluminium alloy
• Material: aluminium alloy

Best for: GE vertical-throw panel owners.

Why it ranks #5: Fits newer GE 150- or 200-amp panels with a vertical-throw main and gives a 2 1/4-inch spacing requirement, making layout verification decisive.

The XMK kit targets GE General Electric 150- or 200-amp panels with a newer vertical-throw main, giving owners of that specific panel arrangement a defined interlock option. Its stated 2 1/4-inch spacing offers a direct layout measurement to check before choosing the kit.

Compatibility is specified for GE 150- or 200-amp panels with a newer vertical-throw main, so the panel’s brand, rating, and breaker orientation all matter to the fit decision. The 2 1/4-inch spacing requirement adds a physical check beyond the model family. The included component is the generator interlock kit, and its aluminium-alloy construction identifies the listed material. Buyers should verify the panel type against these stated boundaries before planning installation.

Skip it if you need an interlock for Eaton Cutler Hammer CH panels; XMK’s CH-series kit is the more relevant panel-family match.

This suits GE panel owners whose 150- or 200-amp unit has a newer vertical-throw main and the stated 2 1/4-inch spacing. It is not a general-purpose interlock for other panel families.

Listed on Amazon as: Generator Interlock Kit for GE General Electeric 150 or 200A Vertical Main

#6 · Best CH Match

6. XMK Eaton CH

• Material Type: Metal
• Material: Metal

Best for: Eaton CH horizontal-main owners.

Why it ranks #6: Specifically fits horizontal-main Eaton/Cutler Hammer CH Series TAN breaker panels rated 150 or 200 amps; verify the panel and breaker type.

Compatibility with horizontal-main Eaton Cutler Hammer CH Series TAN breaker panels defines this XMK kit, giving owners of those 150- or 200-amp panels a specific generator-interlock option. Its emphasis on a tan generator breaker helps distinguish the stated fit from other CH panel configurations.

The kit is listed for Eaton or Cutler Hammer Type CH panels rated 150 or 200 amps, with a horizontal main and a tan generator breaker. Those details make panel orientation and breaker type key checks before installation, rather than relying on the CH name alone. The supplied material is metal, and the included component is the generator interlock kit. The listing does not specify a spacing measurement or installation hardware, so those details are not established here.

Skip it if you have a vertical-throw Eaton CH-5 panel; HUBRV’s CH-5 interlock is specified for that configuration.

Choose this for a 150- or 200-amp Eaton Cutler Hammer CH panel with a horizontal main and tan generator breaker. The listed fit does not cover other breaker orientations or colors.

Listed on Amazon as: Generator Interlock Kit fit for Eaton Cutler Hammer CH Series 150 & 200 Amp

#7

7. SPZOCE SP-PN200

Best for: Plug-in-neutral Eaton panel owners.

Why it ranks #7: Fits Eaton/Cutler Hammer BR and plug-in-neutral CH Series panels at 150 or 200 amps, with listed spacing of 1 1/4 to 1 7/16 inches.

SPZOCE’s compatibility with Eaton or Cutler Hammer BR and CH panels with plug-in neutral gives owners of those configurations a targeted interlock option. Its stated 1 1/4- to 1 7/16-inch spacing range is the key layout detail to check alongside panel series and rating.

The listing covers BR and CH Series panels with plug-in neutral, rated 150 or 200 amps, and specifies 1 1/4–1 7/16 inches between the main and branch breakers. These named conditions make panel configuration and measured spacing central to fit. A 3/16-inch sturdy steel drill bit and detailed installation manual are included, supporting the installation workflow with a listed tool and written guidance. Buyers should not assume the kit fits BR or CH panels without the plug-in-neutral feature.

Skip it if you have a GE panel; SPZOCE’s SP-GE200 kit is specifically listed for GE 150- or 200-amp panels.

This is for Eaton or Cutler Hammer BR or CH owners with plug-in-neutral panels and matching 150- or 200-amp ratings. Verify both the plug-in-neutral configuration and the stated spacing range before choosing it.

Listed on Amazon as: Generator Interlock Kit for Eaton Cutler Hammer BR Series 150&200Amp Panels

#8

8. HUBRV Eaton CH5

• Material Type: Plastic, Polycarbonate (PC)
• Material: Plastic, Polycarbonate (PC)

Best for: Vertical-throw Eaton CH-5 owners.

Why it ranks #8: Targets vertical-throw Eaton or Cutler Hammer CH-5 150- or 200-amp panels and specifies 2 1/4-inch spacing, a specialized layout.

HUBRV’s interlock physically blocks simultaneous main and generator breaker activation, enabling source isolation during generator use. It is specified for vertical-throw Eaton or Cutler Hammer CH-5 panels rated 150 or 200 amps, with a 2 1/4-inch spacing requirement that sets a clear fit boundary.

The vertical-throw CH-5 compatibility and 2 1/4-inch spacing requirement help buyers match both panel configuration and breaker layout. The listing says the interlock physically blocks the main and generator breakers from being on together, addressing backfeed risk through mechanical separation. A matching drill bit and four shoulder screws are included, along with a stated DIY installation time of 10–15 minutes using standard household tools. Those details support a more defined installation workflow, though correct panel fit remains essential.

Skip it if you have a horizontal-main Eaton CH panel with a tan generator breaker; XMK’s CH-series kit specifies that configuration.

This suits owners of 150- or 200-amp vertical-throw CH-5 panels who want a physical breaker interlock and the listed installation hardware. The 2 1/4-inch spacing is a firm fit consideration.

Listed on Amazon as: Generator Interlock Kit Compatible with Eaton or Cutler Hammer Vertical Throw CH Series CH5 150 or 200 amp, 2 1/4" Spacing Between Main and GEN Breaker

#9

9. Siemens ECSBPK01

Best for: Siemens or Murray panel owners.

Why it ranks #9: UL-listed for Siemens or Murray panels, but its listed main-breaker range is 15–125 amps rather than the 150- or 200-amp panels most options target.

The Siemens ECSBPK01 mechanically forces the utility-powered main breaker off when standby power is in use, giving compatible panels a defined source-isolation function. UL listing and use on Siemens or Murray panels make it a specifically bounded choice for those panel owners.

This interlock works with Siemens or Murray panels whose main is a double-pole QP breaker rated 15–125 amps; the standby breaker must be QP or MP type. Those requirements help buyers screen panel and breaker compatibility before installation. Siemens states that the kit requires no panel modification, which can simplify the installation workflow, while the mechanical action forces the main off during standby operation and the standby source off when utility power is in use. Breakers are not included.

Skip it if you need the interlock kit to include breakers; this listing explicitly excludes them, so it will not provide a complete breaker set.

A fit for Siemens or Murray panel owners using the specified QP main and QP or MP standby breaker arrangement. Account for the excluded breakers, and keep the 15–125-amp main rating boundary in view.

Listed on Amazon as: Siemens ECSBPK01 Generator Standby Power Mechanical Interlock

#10

10. Siemens ECSBPK02

• Material: Metal

Best for: Siemens standby power setups.

Why it ranks #10: Designed for Siemens or Murray panels, but the supplied listing does not state a 150- or 200-amp panel fit; breakers are not included.

The Siemens ECSBPK02 mechanically forces the utility main off when standby power is in use, giving compatible Siemens or Murray panels a defined source-isolation function. Its UL listing and no-modification installation make it a focused option for buyers using the specified breaker arrangement.

This kit is for Siemens or Murray panels with a double-pole QP main breaker rated 15–125 amps, paired with a QP or MP standby breaker. These breaker requirements give buyers a clear compatibility screen before installation. Siemens states that no panel modification is required, which supports a less invasive installation workflow. The mechanical interlock also forces the standby source off when utility power is in use. Breakers are not included, so the panel’s existing or separately obtained breakers must match the stated types.

Skip it if you need breakers supplied with the interlock; this kit excludes them, so it will not furnish the full breaker arrangement.

This suits Siemens or Murray panel owners with the listed QP main and QP or MP standby breaker types. Its no-modification installation is relevant, but the breakers remain outside the kit.

Listed on Amazon as: Siemens ECSBPK02 Generator Standby Power Mechanical Interlock