Top 10 Best interlock switch kit for generator in 2026

Last Updated - 6/11/2026

🏆Best Choice

Natupal

Natupal 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)

9.8

ChoiceComparer.com Score

9.8

/ 10

Outstanding

Main highlights

•【Compatible Models】Generator Interlock Kit Compatible with Square D QO or Homeline 150 or 200 amp panels.
•【Interval Space Required】1 3/8 Inch Spacing between main and generator breaker.
•【Safety Generator Interlock kit】This kit avoids the inconveniences that an unexpected power outage can cause. It is used to direct generator power to any circuit within your home safely. It is truly a great way to safely connect up a generator while assuring that you have access to all of your home electrical appliances.
•【Package Contents】Our Generator Interlock kit include 1 × Interlock plate, 3 × Shoulder Screws, 3 × Hex Nuts, 1 × Generator Start-Up Procedure Label, 5 × Remind Label, 2 × Zip Ties, 1 × Instruction Bulletin, 1 × Drill Bit.
•【Easy to Install】The generator interlock kit offers a 3/16 drill bit, sturdy steel that goes through breaker panel easily. Easy to install, no need extra control box or wiring. Simply contact us back if our product ever fails you and we'll mail you a new original replacement.

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$17.99

$26.99

-33%

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EXCELFU

Generator Interlock Kit Compatible with Eaton Cutler Hammer BR SERIES 150 and 200 amp Panels, Generator Horizontal Electrical Interlock Kit, 1 1/4-1 7/16 inches Spacing Between Main and Branch Breaker

9.7

ChoiceComparer.com Score

9.7

/ 10

Outstanding

Main highlights

•Safe and Reliable: Generator interlock kit for Eaton Cutler Hammer provide a safe and cost-effective way to backfeeding of your home electrical appliances by a portable generator. Ideal solution for power outages or emergency backup power to keep your home geared up and running safely.
•Compatible Models: Generator Interlock Kit Compatible with Eaton/Cutler Hammer Interlock Kit for BR Series, BR series with plug-in neutral and CH-series with plug in neutral 150 and 200 amp
•Main Breaker Position: Single handle horizontal throw left (on) to right (off) 1 1/4 - 1 7/16 inches spacing between main breaker and branch breakers.
•Easy Installation: Easy to connect the generator to electrical panel and ensure the main breaker can never be on while the generator breaker is on.
•What You Get: 1 x Interlock Plate, 3 x Shoulder Screws, 3 x Hex Nuts, 1 x Drill Bit, 1 x Generator Start-Up Procedure Labels, 5 x Remind Label, 2 x Zip Ties, 1 x Instruction and EXCELFU 100% Satisfying Customer Service.

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$15.99

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QYZZRS

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(1set)

9.5

ChoiceComparer.com Score

9.5

/ 10

Outstanding

Main highlights

•Generator interlock kits are available for Square D QO and Homeline 150 and 200 amp panels.
•Interval Space Required：1 3/8 Inch Spacing between main and generator breaker.
•Installation Note: Before installing the interlocking kit, Attach the screws to the interlock kit first. Let's simulate the use of the test, so that we can better align the installation position, to avoid errors in the installation position, resulting in failure to use.
•Safe use：the manual transfer switch device allow portable generator safe back feeding power supply to distribution panel and home line. Prevent utility and generator supplies from being ON at the same time. Aren't putting electrician in dangerous and damage electric devices during power outages.
•Package：Our Generator Interlock kit include 1 × Interlock plate, 3 × Screws kit, 1 × Drill Bit, 1 × Instruction Bulletin, 2 × Generator Start-Up Procedure Label, 8 × Remind Label, 2 × Zip Ties.

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$9.99

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EXCELFU

Generator Interlock Kit Compatible with General Electric GE 150 or 200 Amp Panels, Generator Electrical Interlock Kit, 1 1/4 Inch Spacing Between Main and Branch Breaker

9.4

ChoiceComparer.com Score

9.4

/ 10

Excellent

Main highlights

•Compatible Models: Generator Interlock Kits fit for General Electric GE 150 or 200 Amp Panels.
•Main Breaker Position: 1 1/4 inches spacing between main breaker and branch breakers.
•Safe and Reliable: Generator interlock kit for GE prevents both mains and generator power supply at the same time. The generator lockout kit is used to safely direct generator power to any circuit in your home, while ensuring you can safely use all your household appliances. Ideal solution to keep your home geared up and running safely while power outages.
•Easy Installation: Easy to connect the generator to GE electrical panel. Moves smoothly when in operation and ensure the main breaker can never be on while the generator breaker is on.
•Complete Generator Breaker Interlock Kit : 1 x Interlocking Plate, 3 x Shoulder Screws, 3 x Hex Nuts, 1 x Drill Bit, 5 x Remind Labels, 2 x Zip Ties, 1 x Instruction and EXCELFU 100% Satisfying Customer Service.

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$14.99

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QYZZRS

Generator Interlock Kit Compatible with Eaton Cutler Hammer BR Series 150 and 200 amp Panels,1 1/4-1 7/16 inches Spacing Between Main and Branch Breaker,Professional and Interlock Kit(1Set)

9.2

ChoiceComparer.com Score

9.2

/ 10

Excellent

Main highlights

•This Interlock Kit Compatible with Eaton Cutler Hammer BR and CH Series Main 150 and 200 AMP Panels
•Interval Space Required：1 1/4 - 1 7/16 Inch Spacing between main and generator breaker. Make sure the model numbel and spacing is correct, and they will work.
•Installation Note: Before installing the interlocking kit, Attach the screws to the interlock kit first. Let's simulate the use of the test, so that we can better align the installation position, to avoid errors in the installation position, resulting in failure to use.
•Package：Our Generator Interlock kit include 1 × Interlock plate, 3 × Screws kit, 1 × Drill Bit, 1 × Instruction Bulletin, 2 × Generator Start-Up Procedure Label, 8 × Remind Label, 2 × Zip Ties.
•Safe use：the manual transfer switch device allow portable generator safe back feeding power supply to distribution panel and home line. Prevent utility and generator supplies from being ON at the same time. Aren't putting electrician in dangerous and damage electric devices during power outages.

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$7.99

$9.99

-20%

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XMK

Generator Interlock Kit for Eaton Cutler Hammer 100A and 125A BR Series Panels,Interlock Kit for Eaton Cutler Hammer 100 Amp and 125 Amp for BR Series Panels with Adjacent Main and Branch Breakers

9.1

ChoiceComparer.com Score

9.1

/ 10

Excellent

Main highlights

•Compatible Models: Generator interlock kit compatible with Cutler Hammer/Eaton interlock kit for BR Series 100 and 125 amp panels
•Main and Branch Breaker Position: Single handle horizontal throw left to right main breaker and adjacent branch breakers
•Safe and Reliable: Generator interlock kit for Eaton Cutler Hammer 100A and 125A provide a safe and cost-effective way to backfeeding of your home electrical appliances by a portable generator; Ideal solution for power outages or emergency backup power to keep your home geared up and running safely
•Easy Installation: Easy to connect the generator to Eaton/Cutler Hammer electrical panel and ensure the main breaker can never be on while the generator breaker is on; Moves smoothly when in operation and provide safety for your family
•Complete Interlock Kits: 1 x Interlocking Plate, 3 x Shoulder Screws, 3 x Hex Nuts, 1 x Matching Drill Bit, 1 x Generator Start-Up Procedure Labels, 5 x Remind Labels, 2 x Zip Ties, 1 x Instruction

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$15.99

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QYZZRS

QYZZRS Generator Interlock Kit Compatible with Eaton Cutler Hammer 100 Amp and 125 Amp Panels Breaker,for Safe Usage of Portable Power During Outage,Professional and Interlock Kit (1)

8.9

ChoiceComparer.com Score

8.9

/ 10

Great

Main highlights

•QYZZRS Generator Interlock Kit Compatible with Eaton Cutler Hammer 100 Amp and 125 Amp Panels Breaker.
•Installation Note: Before installing the interlocking kit, Attach the screws to the interlock kit first. Let's simulate the use of the test, so that we can better align the installation position, to avoid errors in the installation position, resulting in failure to use.
•Package：Our Generator Interlock kit include 1 × Interlock plate, 2 × Screws kit, 1 × Drill Bit, 1 × Instruction Bulletin, 2 × Generator Start-Up Procedure Label, 8 × Remind Label, 2 × Zip Ties.
•Safe use：the manual transfer switch device allow portable generator safe back feeding power supply to distribution panel and home line. Prevent utility and generator supplies from being ON at the same time. Aren't putting electrician in dangerous and damage electric devices during power outages.
•Includes detailed installation instructions

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$9.99

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GenCap

Generator Interlock Kit Compatible with Square D Electric HOMCGK2C Homeline Cover Generator and QOM2 Frame Size Main Breaker Interlock Kit

8.8

ChoiceComparer.com Score

8.8

/ 10

Great

Main highlights

•【Compatible Models】For use on indoor Homeline 150A - 225A Main Breaker. Quickly convert existing HomeLine Load Centers into back-up power solutions. No need for a separate generator panel or special cover.
•【Safety Generator Interlock kit】This kit interlocks the QOM1 or QOM2 main breaker with a 2-pole breaker back-fed from a generator. Avoid the inconveniences that an unexpected power outage can cause with Indoor Generator Interlock Kit. It is used to direct generator power to any circuit within your home. It is truly a great way to safely connect up a generator, while assuring that you have access to all of your home electrical appliances.
•【Package Contents】Our Generator Interlock kit Includes 1 interlock bracket, 1 retaining bracket, 1 hole drilling template, 3 hex nuts, 3 10-32 shoulder screws,1 interior mounting screw, 1 Instruction Bulletin, 1 Wiring diagram and 2 Interlock translation labels.
•【High Quality and Reusable】This Interlock Kits are engineered from impact and chemical resistant stainless steel,which are very durable and reusable.Very easy to install or remove from within few seconds.Allow you to install this Interlock Kits more convenient and easier.Ideal for domestic and professional use with high quality.This interlock kit meets UL and ANSI safety requirements.
•【Easy to Install】The generator interlock kit offers drill bit, sturdy steel that goes through breaker panel easily. Easy to install, no need extra control box or wiring.

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$17.99

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DSGSANO

DSGSANO Generator Interlock Kit for Square D QO & Homeline 150/200 Amp Panels – 1 3/8" Spacing Between Main & Generator Breaker, Professional Grad

8.6

ChoiceComparer.com Score

8.6

/ 10

Good

Main highlights

•Perfect Compatibility:designed to fit Square D QO and Homeline 150 or 200 amp panels with a 1 3/8" spacing between the main and generator breakers. Ensures a precise and secure fit.
•Enhanced Safety Design:prevents simultaneous connection of utility and generator power. Helps avoid back-feeding and protects utility workers and home electrical systems.
•Easy DIY Installation:includes all installation hardware: drill bit, screws, nuts, labels, and zip ties. No additional wiring or control boxes required. Install in under 30 minutes.
•Durable Construction:made from heavy-duty 3/16" thick aluminum for long-lasting durability and corrosion resistance. Suitable for indoor and outdoor use.
•Cost-Effective Solution:smart alternative to expensive transfer switches. Provides reliable backup power integration without breaking the bank.

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$7.59

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XMK

Generator Interlock Kit for Square D QO or Homeline 100 or 125 Amp Panels, 3/4 to 7/8 Inches Spacing, Professional and Interlock Kit for Square D Homeline and QO 100 A Indoo or Outdoor

8.5

ChoiceComparer.com Score

8.5

/ 10

Good

Main highlights

•Compatible Models: Generator interlock kit compatible with Square D QO or Home line interlock kit for 100 and 125 amp panels
•Main and Branch Breaker Space: Single handle horizontal throw left to right 3/4 - 7/8 inches spacing between main breaker and branch breakers
•Safe and Reliable: Generator interlock kit for Square D QO or Homeline provide a safe and cost-effective way to backfeeding of your home electrical appliances by a portable generator; Ideal solution for power outages or emergency backup power to keep your home geared up and running safely
•Easy Installation: Easy to connect the generator to Square D QO or Home line panel and ensure the main breaker can never be on while the generator breaker is on; Moves smoothly when in operation and provide safety for your family
•Complete Interlock Kits: 1 x Interlocking Plate, 3 x Shoulder Screws, 3 x Hex Nuts, 1 x Matching Drill Bit, 1 x Generator Start-Up Procedure Labels, 5 x Remind Labels, 2 x Zip Ties, 1 x Instruction

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$19.99

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