Generator Interlock Switch

Electrical safety devices for generator and utility power isolation.

63A 110V Automatic-Manual Transfer Switch, L1 Priority Phase Selector, LED Display, DIN Rail Mount, Compact Design, CE Certified for Home, Data Centers, Healthcare Facilities, Generator Inverter & Utility Power Protection, 50/60Hz

63A 110V Automatic-Manual Transfer Switch, L1 Priority Phase Selector, LED Display, DIN Rail Mount, Compact Design, CE Certified for Home, Data Centers, Healthcare Facilities, Generator Inverter & Utility Power Protection, 50/60Hz

4.91.3K sold
-13%$43.27$49.99
Safe Backfeed Generator Interlock Kit for Square D QO/Homeline 100/125-Amp Indoor/Outdoor Panels, Single Handle, 3/4-7/8 in Spacing, Portable Synthetic Generator Accessory, 1 x Instruction, Start-Up Procedure Labels, Matching Drill Bit, 2 Zip Ties

Safe Backfeed Generator Interlock Kit for Square D QO/Homeline 100/125-Amp Indoor/Outdoor Panels, Single Handle, 3/4-7/8 in Spacing, Portable Synthetic Generator Accessory, 1 x Instruction, Start-Up Procedure Labels, Matching Drill Bit, 2 Zip Ties

4 sold
Limited time deal
$12.99
Generator Interlock Kit for Cutler Hammer BR Series 150-200 A Electrical Panels, Horizontal Kit with 1 7/16-1 1/4 in Main-N Breaker Spacing, Includes 1x Instruction, 1x Matching Drill Bit, 2x Zip Ties, 3x Hex Nuts, 5x Remind Labels, 4-6 Years Lifespan, 1
Free shipping

Generator Interlock Kit for Cutler Hammer BR Series 150-200 A Electrical Panels, Horizontal Kit with 1 7/16-1 1/4 in Main-N Breaker Spacing, Includes 1x Instruction, 1x Matching Drill Bit, 2x Zip Ties, 3x Hex Nuts, 5x Remind Labels, 4-6 Years Lifespan, 1

1 sold
-20%$24.46$30.57
Generator Transfer Switch, Manual Transfer Switch 120/240V 12000W Capacity Tailor-Made for Portable Generator, 50A 3P Dual Power Manual
Free shipping

Generator Transfer Switch, Manual Transfer Switch 120/240V 12000W Capacity Tailor-Made for Portable Generator, 50A 3P Dual Power Manual

Limited time deal
$74.99
Generator Interlock Kit (SD200A) - Interlocking Design, Metal Construction with Aluminum Alloy Frame, Polished Edges & Rectangular Plate, Compatible with QO & Homeline 150/200 A Panels, 1 3/8" Spacing Between Main & Generator Breakers, Prevents Outages, S
Free shipping

Generator Interlock Kit (SD200A) - Interlocking Design, Metal Construction with Aluminum Alloy Frame, Polished Edges & Rectangular Plate, Compatible with QO & Homeline 150/200 A Panels, 1 3/8" Spacing Between Main & Generator Breakers, Prevents Outages, S

$67.47
Horizontal Electrical Interlock Kit for Generators, 150-200 A Panel Compatible, 1 1/4-1 7/16 in Breaker Spacing, No Wiring Required, Durable Metal Construction, Easy DIY Backup Power Installation Tool

Horizontal Electrical Interlock Kit for Generators, 150-200 A Panel Compatible, 1 1/4-1 7/16 in Breaker Spacing, No Wiring Required, Durable Metal Construction, Easy DIY Backup Power Installation Tool

Limited time deal
$57.37
240V 60A Generator Transfer Switch
Free shipping

240V 60A Generator Transfer Switch

Limited time deal
$80.88
VEVOR Manual Transfer Switch, 30-Amp 6-Circuit, Prewired Generator Transfer Switch Kit with NEMA L14-30P Power Inlet Box, Double-Throw Switch, NEMA 3R, Mechanical Watt Meter, for 7500W Generators
Free shipping

VEVOR Manual Transfer Switch, 30-Amp 6-Circuit, Prewired Generator Transfer Switch Kit with NEMA L14-30P Power Inlet Box, Double-Throw Switch, NEMA 3R, Mechanical Watt Meter, for 7500W Generators

Limited time deal
$233.44
Generator Interlock Kit for Vertical Main 150/200 A Breaker, 3.25-4 in Spacing, Power Outage Safety Switch with Metal Plate, 8 Remind Labels, 3 Screws Kit, Drill Bit, Instruction Bulletin for Power Distribution Backfeed Prevention
Free shipping

Generator Interlock Kit for Vertical Main 150/200 A Breaker, 3.25-4 in Spacing, Power Outage Safety Switch with Metal Plate, 8 Remind Labels, 3 Screws Kit, Drill Bit, Instruction Bulletin for Power Distribution Backfeed Prevention

$49.98
Manual Transfer Switch 30A Generator Transfer Switch 120/240V, 7500W Capacity, 3-Pole, for Portable Generator
Free shipping

Manual Transfer Switch 30A Generator Transfer Switch 120/240V, 7500W Capacity, 3-Pole, for Portable Generator

Limited time deal
$64.99
VEVOR 100A Generator Transfer Switch 24000W Manual Transfer Switch 120/240V

VEVOR 100A Generator Transfer Switch 24000W Manual Transfer Switch 120/240V

Limited time deal
$111.42
Generator Interlock Kit for Square D QO HOM 150 or 200 Amp Panels, 1 3/8 Inch Spacing Between Main and Branch Breaker, Professional Updated VersionGift

Generator Interlock Kit for Square D QO HOM 150 or 200 Amp Panels, 1 3/8 Inch Spacing Between Main and Branch Breaker, Professional Updated VersionGift

Limited time deal
$28.25
Generator Interlock Kit Compatible with Siemens and Murray, ECSBPK02 Mechanical Interlock Between Main Breaker and Generator for Utility and Standby Power

Generator Interlock Kit Compatible with Siemens and Murray, ECSBPK02 Mechanical Interlock Between Main Breaker and Generator for Utility and Standby Power

Limited time deal
$52.73
Generator Interlock Kit, HOMCGK2C Homeline Cover, QOM2 Frame Size Main Breaker Interlock, 150A - 225A Main Breaker Load Centers, Indoor Kit
Free shipping

Generator Interlock Kit, HOMCGK2C Homeline Cover, QOM2 Frame Size Main Breaker Interlock, 150A - 225A Main Breaker Load Centers, Indoor Kit

$35.98
Generator Interlock Kit Compatible with ITE, Gould, Siemens & Thomas and Betts - 150/200-Amp Electrical Panels, 1.25-Inch Main-Breaker Spacing, Includes Drill Bit, Instruction Bulletin, Start-Up Procedure Label, 2 Zip Ties, 1 Drill Bit
Free shipping

Generator Interlock Kit Compatible with ITE, Gould, Siemens & Thomas and Betts - 150/200-Amp Electrical Panels, 1.25-Inch Main-Breaker Spacing, Includes Drill Bit, Instruction Bulletin, Start-Up Procedure Label, 2 Zip Ties, 1 Drill Bit

$47.48
Generator Interlock Kit Compatible with Siemens 150A & 200A Panels, Horizontal Electrical Interlock Kit with 7/8-1 1/4in Main-to-N Breaker Spacing, Includes 1x Instruction, 1x Matching Drill Bit, 2x Ties, 3x Hex Nuts, 1 X Instruction, 1 X Matching Drill B
Free shipping

Generator Interlock Kit Compatible with Siemens 150A & 200A Panels, Horizontal Electrical Interlock Kit with 7/8-1 1/4in Main-to-N Breaker Spacing, Includes 1x Instruction, 1x Matching Drill Bit, 2x Ties, 3x Hex Nuts, 1 X Instruction, 1 X Matching Drill B

$30.58
Generator Interlock Kit for Homeline Cover Generator and QOM2 Frame Size Main Breaker

Generator Interlock Kit for Homeline Cover Generator and QOM2 Frame Size Main Breaker

Limited time deal
$32.21
Generator Interlock Kit Compatible with ITE, Gould, , Siemens, and Thomas and Betts, 150 or 200 amp panels, 1 1/4 Inch Spacing between main and generator breaker
Free shipping

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

$32.14
110V 63A 2P Automatic Transfer Switch ATS 50/60Hz Dual Power Generator Changeover Switch for Refrigerators Furnaces Lights and Critical Home Circuits

110V 63A 2P Automatic Transfer Switch ATS 50/60Hz Dual Power Generator Changeover Switch for Refrigerators Furnaces Lights and Critical Home Circuits

Limited time deal
$47.89
C734dn 5V Interlock Switch
Free shipping

C734dn 5V Interlock Switch

$20.45
2P/63A Model Dual Power Automatic Transfer Switch (ATS) - GCQ2-63/2 Wall Mount Switching Device, 110V 63A Rated Home Backup Generator Use, Auto/Manual Mode, 2s Fast Switching, Pure Copper Motor, Resin&Steel, M8
Free shipping

2P/63A Model Dual Power Automatic Transfer Switch (ATS) - GCQ2-63/2 Wall Mount Switching Device, 110V 63A Rated Home Backup Generator Use, Auto/Manual Mode, 2s Fast Switching, Pure Copper Motor, Resin&Steel, M8

5.08 sold
Limited time deal00:00:00
-39%$30.49$49.99
110V 63A 2P Automatic Transfer Switch ATS 50/60Hz Dual Power Generator Changeover Switch for Refrigerators Furnaces Lights and Critical Home Circuits
Free shipping

110V 63A 2P Automatic Transfer Switch ATS 50/60Hz Dual Power Generator Changeover Switch for Refrigerators Furnaces Lights and Critical Home Circuits

Limited time deal
$47.89
2P 63A ATS Dual Power Automatic Transfer Switch for Generator Changeover Switch 110V GCQ2-63/2 Industrial Switching Blue Resin Steel Wall Mount IP63

2P 63A ATS Dual Power Automatic Transfer Switch for Generator Changeover Switch 110V GCQ2-63/2 Industrial Switching Blue Resin Steel Wall Mount IP63

4.8128 sold
$56.81
2P 63A Dual Power Automatic Transfer Switch (ATS) - GCQ2-63/2 Generator Changeover, Household Wall Mount Switching System for 110V Home Backup Generators, Suitable for Banks, Elevators

2P 63A Dual Power Automatic Transfer Switch (ATS) - GCQ2-63/2 Generator Changeover, Household Wall Mount Switching System for 110V Home Backup Generators, Suitable for Banks, Elevators

4.9711 sold
-37%$42.30$67.59
Generator Interlock Kit

Generator Interlock Kit

Limited time deal
$14.42
Related Searches
generator interlock kit
Interlock Kit
interlock guard
interlock ignition device
ignition interlock device
generator automatic transfer switch
Intwrnal doorlock
Switch controllor
Related Categories
Charge Controllers & Accessories
Motors, Generators & Accessories
Storage Boxes & Bins
Mechanical Hardware
Tool Kits
Statues & Figurines
Party Bags & Gifts
Relays & Breakers
Switches & Accessories
Storage Holders & Racks

Introduction

Generator interlock switches prevent simultaneous connection of standby power and utility lines, protecting linemen and equipment.

  • Mechanical slide plates physically block the main breaker when the generator breaker is engaged, eliminating accidental back-feed.
  • Heavy-gauge steel construction withstands repeated operation and panel vibration without deformation.
  • Clear labeling and padlock provisions support compliance with local electrical codes and insurance requirements.

Confirm panel model compatibility before installation to ensure proper fit.

FAQs

Most jurisdictions require a licensed electrician to install and inspect interlock devices to meet code and maintain warranties.

Sizing depends on the breaker amperage in your panel; the interlock must match that rating, not the generator output.

Interlocks are designed for the service entrance panel; sub-panel setups usually need a transfer switch instead.

With utility power off, attempt to turn on both main and generator breakers; only one should move at a time.

Slide plates and labels can be ordered individually if damaged, but full re-installation inspection is still advised.