Best 12v Dc 4 Pin Relay With Diode of 2025

Last updated on 31/12/2025

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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 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.

9.8

Exceptional

9.8

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

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.

Value for Money

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 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

Gebildet 2pcs 40/30 Amp Waterproof Relay Switch 12AWG Harness Set with Built-in Diode- 12V DC 5-Pin SPDT Automotive Relays Hot Wires

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

WMYCONGCONG 5 PCS DC 12V 80A 1NO SPST 4 Pin Relay Car w/Light Emitting Diodes Light Transparent Case for Car Truck Automotive

WMYCONGCONG 5 PCS DC 12V 80A 1NO SPST 4 Pin Relay Car w/Light Emitting Diodes Light Transparent Case for Car Truck Automotive

WMYCONGCONG

Why we love it

High-current welded connections ensure reliability.
Durable housings withstand harsh temperatures.
Versatile for various car applications.

Main Highlights

Heavy duty SPST relays, 12V 80A 4 prongs high-current welded connections for reliability.
Rating: DC 12V 80A.
High quality composite housings protect against harsh temperatures and severe under hood conditions.
Designed with copper terminals, ideal to be used for many car electronic application, for car alarms, remote starts, HID headlights, pop doors, trunk releases strobe lights, fog lights, stereos.
Package Content: 5 * 12V 80A Car Relay + 5 * Silver Tone Terminal Accessory.

WMYCONGCONG 5 PCS DC 12V 80A 1NO SPST 4 Pin Relay Car w/Light Emitting Diodes Light Transparent Case for Car Truck Automotive

Why we love it

High-current welded connections ensure reliability.
Durable housings withstand harsh temperatures.
Versatile for various car applications.

Main Highlights

Heavy duty SPST relays, 12V 80A 4 prongs high-current welded connections for reliability.
Rating: DC 12V 80A.
High quality composite housings protect against harsh temperatures and severe under hood conditions.
Designed with copper terminals, ideal to be used for many car electronic application, for car alarms, remote starts, HID headlights, pop doors, trunk releases strobe lights, fog lights, stereos.
Package Content: 5 * 12V 80A Car Relay + 5 * Silver Tone Terminal Accessory.

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 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

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

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

Sourcingmap 10pcs 12V DC 4-Pin 30/40Amp Interlocking Relay Socket Harness Base SPDT Black

Sourcingmap 10pcs 12V DC 4-Pin 30/40Amp Interlocking Relay Socket Harness Base SPDT Black

Uxcell

Why we love it

Durable plastic construction ensures longevity.
Easy installation with unique design.
Versatile for multiple automotive applications.

Main Highlights

4 terminals relay socket.;Package Content: 10pcs x Relay Socket Harness.;Wire Length: 130mm / 5.12";Type: 4 Terminals 4 Wires;;Pre-wired relay socket for use with 12V DC
Wire Specifications: Black Pink - Power, Green - Output.
This relay base is made of plastic material, durable and high accuracy, stable and reliable performance.It is waterproof and dustproof, but it needs to be noted that it cannot be used in water.
Unique male-female slot design, easy to connect the relay with harness socket, clean and neat after installation. Be careful when inserting into the receptacle, you can bend the female connector if you push too hard.
Good for adding stereo, alarm system, remote start, fog lights, under lighting, turn on dome light, share door handle, truck release, reverse polarity, door locks, and more.

Sourcingmap 10pcs 12V DC 4-Pin 30/40Amp Interlocking Relay Socket Harness Base SPDT Black

Why we love it

Durable plastic construction ensures longevity.
Easy installation with unique design.
Versatile for multiple automotive applications.

Main Highlights

4 terminals relay socket.;Package Content: 10pcs x Relay Socket Harness.;Wire Length: 130mm / 5.12";Type: 4 Terminals 4 Wires;;Pre-wired relay socket for use with 12V DC
Wire Specifications: Black Pink - Power, Green - Output.
This relay base is made of plastic material, durable and high accuracy, stable and reliable performance.It is waterproof and dustproof, but it needs to be noted that it cannot be used in water.
Unique male-female slot design, easy to connect the relay with harness socket, clean and neat after installation. Be careful when inserting into the receptacle, you can bend the female connector if you push too hard.
Good for adding stereo, alarm system, remote start, fog lights, under lighting, turn on dome light, share door handle, truck release, reverse polarity, door locks, and more.

mxuteuk 2pcs HH54P DC 12V LED Indicator Electromagnetic Power Relay 14 Pin 3A Coil Relays 4PDT with Socket Base,with DIN Slotted Aluminum Rail

mxuteuk 2pcs HH54P DC 12V LED Indicator Electromagnetic Power Relay 14 Pin 3A Coil Relays 4PDT with Socket Base,with DIN Slotted Aluminum Rail

mxuteuk

Why we love it

High contact capacity reliability.
Easy DIN rail mounting solution.
Includes essential accessories for installation.

Main Highlights

Product Name:Electromagnetic Power Relay; Relay Model : HH54P; Type : 4PDT; Number of Terminals : 14 ; Socket Model : PYF14A-E
Mount Rail Type : 35mm DIN Rail; DIN Rail length : 100mm/4"(L)
Coil Voltage:DC 12V; Contact Capacity: 3A 250VAC/3A 28VDC;
Overall size(approx. ): 75 x 29 x 65mm/3" x 1.1" x 2. 6"(L*w*h)
Package Content : 2 x Power Relay + 2 x Socket + 1 x Rail Slotted Aluminum + 2 x Screw

mxuteuk 2pcs HH54P DC 12V LED Indicator Electromagnetic Power Relay 14 Pin 3A Coil Relays 4PDT with Socket Base,with DIN Slotted Aluminum Rail

Why we love it

High contact capacity reliability.
Easy DIN rail mounting solution.
Includes essential accessories for installation.

Main Highlights

Product Name:Electromagnetic Power Relay; Relay Model : HH54P; Type : 4PDT; Number of Terminals : 14 ; Socket Model : PYF14A-E
Mount Rail Type : 35mm DIN Rail; DIN Rail length : 100mm/4"(L)
Coil Voltage:DC 12V; Contact Capacity: 3A 250VAC/3A 28VDC;
Overall size(approx. ): 75 x 29 x 65mm/3" x 1.1" x 2. 6"(L*w*h)
Package Content : 2 x Power Relay + 2 x Socket + 1 x Rail Slotted Aluminum + 2 x Screw

Micro Traders 2X 4 Pin DC 12V 40A Car Relay with Fuse and Harness JD-2912 for Cars Trucks Motorcycles and Other 12V Vehicles

Micro Traders 2X 4 Pin DC 12V 40A Car Relay with Fuse and Harness JD-2912 for Cars Trucks Motorcycles and Other 12V Vehicles

Micro Traders

Why we love it

Compatible with various vehicles.
High capacity for demanding applications.
Simplified installation with harness included.

Main Highlights

Suitable for cars, trucks, motorcycles, and other 12V vehicles.
Rated for 40A current at 12V DC ensuring stable power switching for high-demand circuits.
The wire length is about 12.5cm, the relay size is 6.2x2.8x2.5cm, and the aperture is 6mm.
Includes pre-wired harness and built-in blade fuse for added protection and simplified installation.
Easy to install, 4-pin design, plug and play wiring harness, hassle-free installation.

Micro Traders 2X 4 Pin DC 12V 40A Car Relay with Fuse and Harness JD-2912 for Cars Trucks Motorcycles and Other 12V Vehicles

Why we love it

Compatible with various vehicles.
High capacity for demanding applications.
Simplified installation with harness included.

Main Highlights

Suitable for cars, trucks, motorcycles, and other 12V vehicles.
Rated for 40A current at 12V DC ensuring stable power switching for high-demand circuits.
The wire length is about 12.5cm, the relay size is 6.2x2.8x2.5cm, and the aperture is 6mm.
Includes pre-wired harness and built-in blade fuse for added protection and simplified installation.
Easy to install, 4-pin design, plug and play wiring harness, hassle-free installation.

Gebildet 2pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST 12AWG Harness Sockets with Built-in Diode for Automotive Truck Van Motorcycle Boat

Gebildet 2pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST 12AWG Harness Sockets with Built-in Diode for Automotive Truck Van Motorcycle Boat

Gebildet

Why we love it

Heavy duty and reliable design.
Color-labeled wires for easy installation.
Exceptional life expectancy and durability.

Main Highlights

Integrated Diode: Each relay includes a built-in diode that suppresses induced voltage during switching, safeguarding your electrical components from potential damage.
Rated operational voltage: 12V/ Switching Capability: 40A
Minimum operating voltage 8V, corresponding minimum operating current is 100mA; Standard operating voltage 12V, corresponding standard operating current is 150mA.
Small size/Low power consumption/High contact voltage/ High sensitivity
Contact Material: Ag Alloy / Contact Resistance: ≤ 100MΩ. Life Expectancy Electrical: 100,000 Operation, Life Expectancy Mechanical: 10,000,000 Operation.

Gebildet 2pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST 12AWG Harness Sockets with Built-in Diode for Automotive Truck Van Motorcycle Boat

Why we love it

Heavy duty and reliable design.
Color-labeled wires for easy installation.
Exceptional life expectancy and durability.

Main Highlights

Integrated Diode: Each relay includes a built-in diode that suppresses induced voltage during switching, safeguarding your electrical components from potential damage.
Rated operational voltage: 12V/ Switching Capability: 40A
Minimum operating voltage 8V, corresponding minimum operating current is 100mA; Standard operating voltage 12V, corresponding standard operating current is 150mA.
Small size/Low power consumption/High contact voltage/ High sensitivity
Contact Material: Ag Alloy / Contact Resistance: ≤ 100MΩ. Life Expectancy Electrical: 100,000 Operation, Life Expectancy Mechanical: 10,000,000 Operation.

Gebildet 4pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST with Built-in Diode for Automotive Truck Van Motorcycle Boat

Gebildet 4pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST with Built-in Diode for Automotive Truck Van Motorcycle Boat

Gebildet

Why we love it

Rated operational voltage: 12V.
High sensitivity and small size.
Long life expectancy.

Main Highlights

Integrated Diode: Each relay includes a built-in diode that suppresses induced voltage during switching, safeguarding your electrical components from potential damage.
Rated operational voltage: 12V/ Switching Capability:40A
Minimum operating voltage 8V, corresponding minimum operating current is 100mA; Standard operating voltage 12V, corresponding standard operating current is 150mA.
Small size/Low power consumption/High contact voltage/ High sensitivity
Contact Material: Ag Alloy / Contact Resistance: ≤ 100MΩ. Life Expectancy Electrical: 100,000 Operations, Life Expectancy Mechanical: 10,000,000 Operations

Gebildet 4pcs JD1912 Car Relay Harness 12V 40A 4 Pin SPST with Built-in Diode for Automotive Truck Van Motorcycle Boat

Why we love it

Rated operational voltage: 12V.
High sensitivity and small size.
Long life expectancy.

Main Highlights

Integrated Diode: Each relay includes a built-in diode that suppresses induced voltage during switching, safeguarding your electrical components from potential damage.
Rated operational voltage: 12V/ Switching Capability:40A
Minimum operating voltage 8V, corresponding minimum operating current is 100mA; Standard operating voltage 12V, corresponding standard operating current is 150mA.
Small size/Low power consumption/High contact voltage/ High sensitivity
Contact Material: Ag Alloy / Contact Resistance: ≤ 100MΩ. Life Expectancy Electrical: 100,000 Operations, Life Expectancy Mechanical: 10,000,000 Operations

A ABSOPRO Automotive Relay 40A DC 12V 4 Pin SPST Black (Set of 2)

A ABSOPRO Automotive Relay 40A DC 12V 4 Pin SPST Black (Set of 2)

A ABSOPRO

Why we love it

Durable plastic for longevity.
Designed for passenger systems.
Easy installation with no tools.

Main Highlights

Replacement For - car relays are made of plastic, which is used for long service life.
Function - Designed for DC voltages in passenger consolation and retainment systems.
Size - Dimension: 6x2.5x2.2cm / 2.36"x0.98"x0.87"(L*W*H)
Installation - Easy to install and replace the broken relay switch, no special tools needed.
Purchase Note - Please ensure this part is suitable for your vehicle before purchasing.

A ABSOPRO Automotive Relay 40A DC 12V 4 Pin SPST Black (Set of 2)

Why we love it

Durable plastic for longevity.
Designed for passenger systems.
Easy installation with no tools.

Main Highlights

Replacement For - car relays are made of plastic, which is used for long service life.
Function - Designed for DC voltages in passenger consolation and retainment systems.
Size - Dimension: 6x2.5x2.2cm / 2.36"x0.98"x0.87"(L*W*H)
Installation - Easy to install and replace the broken relay switch, no special tools needed.
Purchase Note - Please ensure this part is suitable for your vehicle before purchasing.

We scanned 711 products

We reviewed these offers relevant to the 12v Dc 4 Pin Relay With Diode within online retailers such as Amazon, eBay and other local retailers, ensuring we covered all major brands and models. The products we selected come from trusted brands like Gebildet, WMYCONGCONG, Uxcell, mxuteuk, Micro Traders, A ABSOPRO, all of which have a reputation for consistently delivering high-quality products that users love and innovative approaches for function & design.

For the best 12v Dc 4 Pin Relay With Diode in the market, we considered we took a deep dive into 3556 online reviews , focusing on elements like user satisfaction, performance in real-world conditions, and long-term reliability. Our ranking also evaluates each review’s relevancy, authenticity, up-to-dateness and depth so that the comparison is more sound.

We concluded that:

The clear winner of our analysis is Gebildet 2pcs 40/30 Amp Waterproof Relay Switch 12AWG Harness Set with Built-in Diode- 12V DC 4-Pin SPST Automotive Relays Hot Wires. We love many things about this product by Gebildet. What sets it apart from the competition is Waterproof design for all conditions. , Heavy duty wiring for durability. , Color-coded wires for easy installation. .
The best value product for most shoppers and where user satisfaction is continuously the highest is Gebildet 2pcs 40/30 Amp Waterproof Relay Switch 12AWG Harness Set with Built-in Diode- 12V DC 5-Pin SPDT Automotive Relays Hot Wires by Gebildet based on online reviews by bloggers, experts and online shoppers.
The biggest bargain at the moment for 12v Dc 4 Pin Relay With Diode and the best cost-to-value ratio is Gebildet 3pcs 12V Fuse Relay Switch 12 AWG Harness Set with Built-in Diode- 30A ATO/ATC Blade Fuse, 4-Pin SPST Automotive Electrical Relaysat Gebildet with a 4% discount.
Our list of the best 12v Dc 4 Pin Relay With Diode is updated regularly to reflect new releases and changes in product availability, so be sure to check back often for the latest rankings and discounts.