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Best 12v Dc 4 Pin Relay With Diode of 2026
Last updated on 15/02/2026
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1
Gebildet 4 Pin Heavy Duty High Current Relay Battery Isolator 12V DC 500 Amp Vehicle SPST Contactor Double Isolator Control On/Off Switch
Gebildet
Why we love it
Heavy duty for safer work.
High current handling capability.
Versatile for various applications.
Main Highlights
Sturdy and Durable A high performance relay can make your work safer and more efficient. Durable construction for improved high temperature resistance.
Rated voltage 12VDC, this car relay with red copper terminal ensures strong current can be transmitted safely, maximum instantaneous continuity current 500A, long working time max 200A.
Compatibility The relay is an automatic switching element with isolation function, widely used in remote control, telemetry, communication, automatic control, mechatronics and power electronics.
Perfect for split charging or various automotive applications.
Package: 1 x 12 V 500 A relay
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9.8
Exceptional
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9.8
Exceptional
Gebildet
Gebildet 4 Pin Heavy Duty High Current Relay Battery Isolator 12V DC 500 Amp Vehicle SPST Contactor Double Isolator Control On/Off Switch
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Why we love it
Heavy duty for safer work.
High current handling capability.
Versatile for various applications.
Main Highlights
Sturdy and Durable A high performance relay can make your work safer and more efficient. Durable construction for improved high temperature resistance.
Rated voltage 12VDC, this car relay with red copper terminal ensures strong current can be transmitted safely, maximum instantaneous continuity current 500A, long working time max 200A.
Compatibility The relay is an automatic switching element with isolation function, widely used in remote control, telemetry, communication, automatic control, mechatronics and power electronics.
Perfect for split charging or various automotive applications.
Package: 1 x 12 V 500 A relay
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Value for Money
2
Gebildet 2pcs 40/30 Amp Waterproof Relay Switch 12AWG Harness Set with Built-in Diode- 12V DC 4-Pin SPST Automotive Relays Hot Wires
Gebildet
Why we love it
Waterproof design for all conditions.
Heavy duty wiring for durability.
Color-coded wires for easy installation.
Main Highlights
✪ Waterproof automotive relay with 12V DC (max. 14V). Note: 12V and 14V are coil voltages, not the voltage that triggers the switch.
✪ Wire specifications: Black - Ground (85), Red - VDC (30), White - Trigger (86), and Blue - Output - N/O (87)
✪ Excellent waterproof performance, high quality in all weather conditions
✪ Pre-wired harness - Heavy-duty 12AWG wire harness.
✪ Integrated diode: Each relay features a built-in diode that suppresses the induced voltage during switching, protecting your electrical components from potential damage.
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9.7
Exceptional
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9.7
Exceptional
Gebildet
Gebildet 2pcs 40/30 Amp Waterproof Relay Switch 12AWG Harness Set with Built-in Diode- 12V DC 4-Pin SPST Automotive Relays Hot Wires
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Show More
Why we love it
Waterproof design for all conditions.
Heavy duty wiring for durability.
Color-coded wires for easy installation.
Main Highlights
✪ Waterproof automotive relay with 12V DC (max. 14V). Note: 12V and 14V are coil voltages, not the voltage that triggers the switch.
✪ Wire specifications: Black - Ground (85), Red - VDC (30), White - Trigger (86), and Blue - Output - N/O (87)
✪ Excellent waterproof performance, high quality in all weather conditions
✪ Pre-wired harness - Heavy-duty 12AWG wire harness.
✪ Integrated diode: Each relay features a built-in diode that suppresses the induced voltage during switching, protecting your electrical components from potential damage.
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3
EPLZON JD1912 Automotive Relay 4 Pin 40A 12V SPST Automotive Switches And Starters (Pack of 2 pcs)
EPLZON
Why we love it
High-quality electrical conductivity.
Versatile for multiple applications.
Handles high current effortlessly.
Main Highlights
Product Name：JD1912 Automotive DC 4 Pin 12V 40A SPST electrical relay Relay,high quality copper coils and silver contacts create excellent electrical conductivity
Contact Rating: NO: DC 12V 40A , NC : DC 12V 30A
Pin Specifications: 30-High power feed,85-Relay coil ground,86-relay coil feed(trigger wire),87-high power output(normally open contact）
Function: This relay will eliminate a high voltage drop in the wire, so it allows your components to work prperly.50A high coil capacity can easily handle those high current applications
Application: Widely used to install electric cooling fans,Horns, Shaved door handles solenoids, Electric fuel pumps, Electric water Pumps, Trunk solenoids, automotive setups,security systems,car sound systems,and various other applications
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9.6
Superb
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9.6
Superb
EPLZON
EPLZON JD1912 Automotive Relay 4 Pin 40A 12V SPST Automotive Switches And Starters (Pack of 2 pcs)
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Show More
Why we love it
High-quality electrical conductivity.
Versatile for multiple applications.
Handles high current effortlessly.
Main Highlights
Product Name：JD1912 Automotive DC 4 Pin 12V 40A SPST electrical relay Relay,high quality copper coils and silver contacts create excellent electrical conductivity
Contact Rating: NO: DC 12V 40A , NC : DC 12V 30A
Pin Specifications: 30-High power feed,85-Relay coil ground,86-relay coil feed(trigger wire),87-high power output(normally open contact）
Function: This relay will eliminate a high voltage drop in the wire, so it allows your components to work prperly.50A high coil capacity can easily handle those high current applications
Application: Widely used to install electric cooling fans,Horns, Shaved door handles solenoids, Electric fuel pumps, Electric water Pumps, Trunk solenoids, automotive setups,security systems,car sound systems,and various other applications
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4
DollaTek High Current Starter Relay 500 AMP DC 12V 4 Pin SPST Car Auto Start Contactor Double Batteries Isolator Control On/Off Switch
DollaTek
Why we love it
Prevents battery discharge efficiently.
Water resistant for durability.
Handles high current safely.
Main Highlights
Prevents primary battery discharge. Water resistant black phenolic plastic.
This Car relay with Red copper binding post: ensuring heavy current can be transited safely.
Rated voltage 12VDC, maximum instantaneous through current 500A. Work long times maximum 200A
Ensuring the maximum electric current can be transferred, for Multi-battery system Forklift Engineering Automotive
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9.6
Superb
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9.6
Superb
DollaTek
DollaTek High Current Starter Relay 500 AMP DC 12V 4 Pin SPST Car Auto Start Contactor Double Batteries Isolator Control On/Off Switch
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Show More
Why we love it
Prevents battery discharge efficiently.
Water resistant for durability.
Handles high current safely.
Main Highlights
Prevents primary battery discharge. Water resistant black phenolic plastic.
This Car relay with Red copper binding post: ensuring heavy current can be transited safely.
Rated voltage 12VDC, maximum instantaneous through current 500A. Work long times maximum 200A
Ensuring the maximum electric current can be transferred, for Multi-battery system Forklift Engineering Automotive
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5
Gebildet 3pcs 12V Fuse Relay Switch 12 AWG Harness Set with Built-in Diode- 30A ATO/ATC Blade Fuse, 4-Pin SPST Automotive Electrical Relays
Gebildet
4% Off
Why we love it
Built-in fuse, space-saving design.
Easy, color-labeled wiring setup.
Neat, interlocking mounting design.
Main Highlights
Upgraded Version - Automotive relays built in fuse socket with included 30A blade fuse, no need of a separate fuse holder, saving space and money. Heavy duty 12AWG wires for main contact
Integrated Diode: Each relay includes a built-in diode that suppresses induced voltage during switching, safeguarding your electrical components from potential damage.
Neat Mounting Design - The interlocking design of unique male-female slot on each socket edge, easy to connect all relays together, offering clean and neat installation
Good Construction - 12V DC (Max14V DC) and 30A High Switching Capability. Bosch style 4-Pin SPST (Single Pole Single Throw) Relay. Metal mounting bracket on the electrical relay promotes easy installation
Wide Application - Wide range of use, greatly used for car lights, fog lamps, wiper, starter, fans, speakers, traction control systems, etc
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9.4
Superb
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9.4
Superb
Gebildet
Gebildet 3pcs 12V Fuse Relay Switch 12 AWG Harness Set with Built-in Diode- 30A ATO/ATC Blade Fuse, 4-Pin SPST Automotive Electrical Relays
4% Off
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Show More
Why we love it
Built-in fuse, space-saving design.
Easy, color-labeled wiring setup.
Neat, interlocking mounting design.
Main Highlights
Upgraded Version - Automotive relays built in fuse socket with included 30A blade fuse, no need of a separate fuse holder, saving space and money. Heavy duty 12AWG wires for main contact
Integrated Diode: Each relay includes a built-in diode that suppresses induced voltage during switching, safeguarding your electrical components from potential damage.
Neat Mounting Design - The interlocking design of unique male-female slot on each socket edge, easy to connect all relays together, offering clean and neat installation
Good Construction - 12V DC (Max14V DC) and 30A High Switching Capability. Bosch style 4-Pin SPST (Single Pole Single Throw) Relay. Metal mounting bracket on the electrical relay promotes easy installation
Wide Application - Wide range of use, greatly used for car lights, fog lamps, wiper, starter, fans, speakers, traction control systems, etc
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6
Gebildet 2pcs 40/30 Amp Waterproof Relay Switch 12AWG Harness Set with Built-in Diode- 12V DC 5-Pin SPDT Automotive Relays Hot Wires
Gebildet
Why we love it
Excellent waterproof performance guaranteed.
Pre-wired harness for easy installation.
Color-coded wires simplify wiring process.
Main Highlights
12 V DC automotive waterproof relay (max 14 V). Note: 12 V and 14 V are coil voltages, they are not the voltage that triggers the switch
Wire Specifications: Black - Ground (85), Red - VDC (30), White - Trigger (86), Yellow - Output N/C (87a), and Blue - Output N/O (87)
Excellent waterproof performance, high quality in any weather conditions
Integrated Diode: Each relay includes a built-in diode that suppresses induced voltage during switching, safeguarding your electrical components from potential damage.
Easy Wiring - The relay sockets come with color-labeled wires for loads/accessories convenient wiring. Metal mounting tab on the relay for easy installation
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9.3
Superb
Check Price
9.3
Superb
Gebildet
Gebildet 2pcs 40/30 Amp Waterproof Relay Switch 12AWG Harness Set with Built-in Diode- 12V DC 5-Pin SPDT Automotive Relays Hot Wires
Check Price
Show More
Why we love it
Excellent waterproof performance guaranteed.
Pre-wired harness for easy installation.
Color-coded wires simplify wiring process.
Main Highlights
12 V DC automotive waterproof relay (max 14 V). Note: 12 V and 14 V are coil voltages, they are not the voltage that triggers the switch
Wire Specifications: Black - Ground (85), Red - VDC (30), White - Trigger (86), Yellow - Output N/C (87a), and Blue - Output N/O (87)
Excellent waterproof performance, high quality in any weather conditions
Integrated Diode: Each relay includes a built-in diode that suppresses induced voltage during switching, safeguarding your electrical components from potential damage.
Easy Wiring - The relay sockets come with color-labeled wires for loads/accessories convenient wiring. Metal mounting tab on the relay for easy installation
Show More
7
sourcingmap 2 Pcs Z1507091/4 4 Pin DC 12V 40A Car Motor Fuse Relay Switch Power
Uxcell
Why we love it
Durable metal and plastic construction.
Compact size fits various applications.
Perfect for cars and motorcycles.
Main Highlights
Pin Number: 4; Voltage: DC 12V; Amp:40A
Dimension: 6x2.5x2.2cm / 2.36"x0.98"x0.87"(L*W*H); Contact Type: SPST
Made of metal and plastic, durable materials for long time service.
Suitable for cars and motorcycles. It is recommended to confirm the model, appearance, and function before placing an order.
Make sure this is the correct relay replacement your car need before purchase.
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9.1
Superb
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9.1
Superb
Uxcell
sourcingmap 2 Pcs Z1507091/4 4 Pin DC 12V 40A Car Motor Fuse Relay Switch Power
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Why we love it
Durable metal and plastic construction.
Compact size fits various applications.
Perfect for cars and motorcycles.
Main Highlights
Pin Number: 4; Voltage: DC 12V; Amp:40A
Dimension: 6x2.5x2.2cm / 2.36"x0.98"x0.87"(L*W*H); Contact Type: SPST
Made of metal and plastic, durable materials for long time service.
Suitable for cars and motorcycles. It is recommended to confirm the model, appearance, and function before placing an order.
Make sure this is the correct relay replacement your car need before purchase.
Show More
8
2 Packs 12v Fuse Relay Switch Harness Set with 30a Ato Atc Blade Fuse, 4-Pin Spst Automotive Electrical Relays with Heavy Duty 12 Awg Wires for Car Truck Boat Vehicle, Interlocking Mount
Qaum
Why we love it
Colour-coded for easy installation.
Built-in fuse enhances safety.
Durable for extreme conditions.
Main Highlights
Colour-marked cables for one-step wiring: Each 4 pin relay 12v 30a wire is clearly marked with colour to make installation more intuitive: black to ground (85), red to power (30), white to contact signal (86), blue to output (87). 12v 30a relay 4 pin Equipped with thicker 12 AWG heavy-duty wires to ensure stable and reliable connection of high-current loads, 12v fused relay harness no need to double-check, easy to complete the wiring
Built-in fuse design: 12v waterproof relay harness Integrated 30A ATO/ATC blade fuse in the relay socket, eliminating the need for a separate fuse holder, 12v relay fuse harness simplifying the automotive wiring process, saving time and cost, while reducing the number of failure points and improving the overall safety and stability of the electrical system
Wide range of automotive electrical systems: 12v fuse relay switch harness set Suitable for controlling automotive headlights, fog lights, wipers, fans, audio, starter systems, traction control devices, etc. Relay harness 12v 4 pin Wide compatibility, fused relay 12v can be used in cars, trucks, off-road vehicles, RVs and other vehicles, 4 pin relay 12v wiring loom with switch is the ideal accessory for automotive circuit modification and repair
Easy to install and durable: 4 pin 12v 30a relay harness Adopts standard 4-pin SPST relay structure, supporting 12V DC (up to 14V) voltage and up to 30A switching load capacity. Each 30 amp relay 12v comes with a metal mounting bracket for easy and secure fixing in the right place in the car, quick and effortless installation
Durable construction: The 12v dc 30amp relay harness housing is encapsulated with high-strength materials, 12v spst relay fused harness adapting to complex use environments such as high temperature, high humidity and high loads. Whether 12v relay harness with holder is daily driving or electrical operation under extreme conditions, 12v relay holder harness can provide continuous and stable performance and extend the service life of the vehicle system
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9.0
Superb
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9.0
Superb
Qaum
2 Packs 12v Fuse Relay Switch Harness Set with 30a Ato Atc Blade Fuse, 4-Pin Spst Automotive Electrical Relays with Heavy Duty 12 Awg Wires for Car Truck Boat Vehicle, Interlocking Mount
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Show More
Why we love it
Colour-coded for easy installation.
Built-in fuse enhances safety.
Durable for extreme conditions.
Main Highlights
Colour-marked cables for one-step wiring: Each 4 pin relay 12v 30a wire is clearly marked with colour to make installation more intuitive: black to ground (85), red to power (30), white to contact signal (86), blue to output (87). 12v 30a relay 4 pin Equipped with thicker 12 AWG heavy-duty wires to ensure stable and reliable connection of high-current loads, 12v fused relay harness no need to double-check, easy to complete the wiring
Built-in fuse design: 12v waterproof relay harness Integrated 30A ATO/ATC blade fuse in the relay socket, eliminating the need for a separate fuse holder, 12v relay fuse harness simplifying the automotive wiring process, saving time and cost, while reducing the number of failure points and improving the overall safety and stability of the electrical system
Wide range of automotive electrical systems: 12v fuse relay switch harness set Suitable for controlling automotive headlights, fog lights, wipers, fans, audio, starter systems, traction control devices, etc. Relay harness 12v 4 pin Wide compatibility, fused relay 12v can be used in cars, trucks, off-road vehicles, RVs and other vehicles, 4 pin relay 12v wiring loom with switch is the ideal accessory for automotive circuit modification and repair
Easy to install and durable: 4 pin 12v 30a relay harness Adopts standard 4-pin SPST relay structure, supporting 12V DC (up to 14V) voltage and up to 30A switching load capacity. Each 30 amp relay 12v comes with a metal mounting bracket for easy and secure fixing in the right place in the car, quick and effortless installation
Durable construction: The 12v dc 30amp relay harness housing is encapsulated with high-strength materials, 12v spst relay fused harness adapting to complex use environments such as high temperature, high humidity and high loads. Whether 12v relay harness with holder is daily driving or electrical operation under extreme conditions, 12v relay holder harness can provide continuous and stable performance and extend the service life of the vehicle system
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9
4-Pin 80/60AMP 12V DC Waterproof Relay with Harness Kit JD2912 Automotive Relay SPST Heavy Duty 12AWG 16AWG Tinned Copper Wires With Terminals Connectors for Car Truck Motorcycle Boat
MKBKLLJY
Why we love it
Compact and space-saving design.
Versatile for many applications.
Durable materials ensure reliability.
Main Highlights
【Dimension】JD2912 Car Relay:27.7mm x 37.0mm x 63.5mm/1.09inch x 1.45inch x 2.5inch(L x W x H); Pin width: 6.1mm/0.24inch; Harness Length:150.5mm/5.92inch; Bule Terminals Connectors diameter:6.1mm/0.24inch; Yellow Terminals Connectors diameter:8.0mm/0.31inch.
【Wide Application】Widely used in Cars, motorcycles, trucks, electric cars, RVs, vans, yachts, boats, headlights, horns, starters, circuit, Turn signal, warning light, household appliances, automation systems, electronic equipment, meters, receivers, audio equipment, automotive intelligence etc.
【DC 12V 80/60A】This automotive relay is suitable for 12 volt DC power supply, and can withstand peak currents of up to 80 amps in a short period of time, while it can work stably at a current of 60 amps for a long time.
【High-quality material】The contact pins are made of silver alloy and copper alloy, which ensures the smooth flow of the circuit, improves corrosion resistance and wear resistance, and helps maintain the stability and reliability of the relay.
【flame-retardant shell】 The shell uses special flame-retardant materials, which can effectively slow down the spread of fire when encountering high temperatures. It has excellent fire-proof performance, ensuring the stability and reliability of the socket in daily use.
【Compact Structure】D1912 automotive relay wiring harness is designed to be very compact to fit the limited space inside the car, helping to save space.
【Package Include】1PCS JD2912 Waterproof Car Relay Harness 4PCS Bule Terminals Connectors 4PCS Yellow Terminals Connectors.
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8.9
Excellent
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8.9
Excellent
MKBKLLJY
4-Pin 80/60AMP 12V DC Waterproof Relay with Harness Kit JD2912 Automotive Relay SPST Heavy Duty 12AWG 16AWG Tinned Copper Wires With Terminals Connectors for Car Truck Motorcycle Boat
Check Price
Show More
Why we love it
Compact and space-saving design.
Versatile for many applications.
Durable materials ensure reliability.
Main Highlights
【Dimension】JD2912 Car Relay:27.7mm x 37.0mm x 63.5mm/1.09inch x 1.45inch x 2.5inch(L x W x H); Pin width: 6.1mm/0.24inch; Harness Length:150.5mm/5.92inch; Bule Terminals Connectors diameter:6.1mm/0.24inch; Yellow Terminals Connectors diameter:8.0mm/0.31inch.
【Wide Application】Widely used in Cars, motorcycles, trucks, electric cars, RVs, vans, yachts, boats, headlights, horns, starters, circuit, Turn signal, warning light, household appliances, automation systems, electronic equipment, meters, receivers, audio equipment, automotive intelligence etc.
【DC 12V 80/60A】This automotive relay is suitable for 12 volt DC power supply, and can withstand peak currents of up to 80 amps in a short period of time, while it can work stably at a current of 60 amps for a long time.
【High-quality material】The contact pins are made of silver alloy and copper alloy, which ensures the smooth flow of the circuit, improves corrosion resistance and wear resistance, and helps maintain the stability and reliability of the relay.
【flame-retardant shell】 The shell uses special flame-retardant materials, which can effectively slow down the spread of fire when encountering high temperatures. It has excellent fire-proof performance, ensuring the stability and reliability of the socket in daily use.
【Compact Structure】D1912 automotive relay wiring harness is designed to be very compact to fit the limited space inside the car, helping to save space.
【Package Include】1PCS JD2912 Waterproof Car Relay Harness 4PCS Bule Terminals Connectors 4PCS Yellow Terminals Connectors.
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10
Glarks 10 Pack DC 12V 40 Amp 4-Pin SPST Electrical Relays Switch for Car Automotive Motor Van Boat Truck
GLARKS
Why we love it
Durable packaging for easy storage.
Easy installation with plug connectors.
Universal compatibility for various devices.
Main Highlights
★ What You Get: In this package, it included 10 pack 4 pin SPST(Single Pole Single Throw) electrical relays switch are packed in a durable box.
★ Easy to use: The 4 Pin relay is SPST contact type and which voltage is 12V, current is 40A. They are easy to install, just plug in connector and secure them. They are the great replacement for light bar, suitable for most LED light bar wiring harness kit.
★ These Relays are Interchangeable/Compatible with: All automobiles and devices equipped with a 12 Volt DC power source.
★ Multipurpose: These relays have a universal application and can be used in automotive setups, car sound systems, security systems, and various other applications.
★ Application: 4 pin relays suitable for a device draws heavy amperage such as car alarms, remote starts, HID headlights, pop doors, trunk releases strobe lights, fog lights, stereos, fans, air horns and so on.
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8.9
Excellent
Check Price
8.9
Excellent
GLARKS
Glarks 10 Pack DC 12V 40 Amp 4-Pin SPST Electrical Relays Switch for Car Automotive Motor Van Boat Truck
Check Price
Show More
Why we love it
Durable packaging for easy storage.
Easy installation with plug connectors.
Universal compatibility for various devices.
Main Highlights
★ What You Get: In this package, it included 10 pack 4 pin SPST(Single Pole Single Throw) electrical relays switch are packed in a durable box.
★ Easy to use: The 4 Pin relay is SPST contact type and which voltage is 12V, current is 40A. They are easy to install, just plug in connector and secure them. They are the great replacement for light bar, suitable for most LED light bar wiring harness kit.
★ These Relays are Interchangeable/Compatible with: All automobiles and devices equipped with a 12 Volt DC power source.
★ Multipurpose: These relays have a universal application and can be used in automotive setups, car sound systems, security systems, and various other applications.
★ Application: 4 pin relays suitable for a device draws heavy amperage such as car alarms, remote starts, HID headlights, pop doors, trunk releases strobe lights, fog lights, stereos, fans, air horns and so on.
Show More
