Best Car Electrical System Relays in 2026

User Manual available for download under Product Information Details

Bosch style 5-Pin SPDT (Single Pole Double Throw) Relay

40A/30A High Switching Capability.

Never go beyond its capabilities. Try to stay 10 to 15% below what the rate is for

12-volt 5-prong relay. Excellent water-repellent and dustproof ability, but not using it in water

Be careful when inserting the relay into the socket. If you force it, you will bend the female connectors

Built in fuse socket with included 30A blade fuse with heavy duty 14AWG wires for main contact.

Bosch style 4-Pin SPST (Single Pole Single Throw) Relay.

12VDC (14V Max) and 30A High Switching Capability.

Includes 8 Jumpers to fit most popular relays

Includes Test Lead Kit for easily and securely connecting Relay Test Jumpers to a multimeter

Terminal Leads with switch, fuse and power options provide easy access to check current or voltage on many fuses and relays used on vehicles today

Coil power: 1.8w, and coil resistance is 80 ohms. It is more reliable than 2.4w((60 ohms) and 4.8w(30 ohms) relays on the market

Large capacity, high current carrying capacity, heavy-duty make/break relay

Ideal for split charging or any vehicle needing a high-power relay

40A/30A high switching capability

Bosch style 5-prong universal standard relay, SPDT (Single Pole Double Throw)

Pin Specifications: 30-VDC, 85-Ground, 86-Trigger, 87-Output N/O, 87a-Output N/C

Easy to follow wiring diagram simplify wiring your dual electric fans. RED to 12VDC Positive Battery Terminal, COFFEE to Fan Positive, BLACK to Ignition, GREY to Sending Unit per wiring diagram. Direct replacement part fits 10, 12, 14, and 16 inch cooling fans

Temperature switch turns on fan approximately at 185 Degrees and Off at 175 Degrees. The temp sensor has a 3/8 inch pipe thread, and a 1/2 inch adapter included

This electric cooling fan thermostat kit comes with everything you need, includes 40A relay, wiring harness, thermostat switch, 3/8 inch to 1/2 inch adapter, inline fuse holder, 2 20amp fuse, 1 spade connector for the temp sensor, 8 ring terminals, and 4 wire connectors

Electrical Fuel Pump Harness and Relay Wiring Kit with 30 Amp Relay, Circuit Breaker, 100 Inch Long, 10-18 Gauge Wire, 12v, and Including Crimp Terminals / Hardware

Electrical Fuel Pump Harness and Relay is Ideal For High Amp Draw and High-Performance Cooling Fan, Water and Fuel Pumps

This Relay Kit is 100 inch Long, 30 Amp Relay with Pre-Wire Connector. 30 Amp Circuit Breaker. 10-18 Gauge Wire

CONTROL 12vDC automotive accessories up to 20A for resistive loads, and up to 12A for electric motor loads such as fans and pumps.

UNIVERSAL FIT - Simply mount anywhere inside your vehicle cabin. For engine bay installation, use an MGI Junction Box (B08HVZBCDZ)

HIGH-QUALITY aluminum module box laser cut in North America. Dimensions: 6.625" x 3.25" x 5.625"

Plug-and-play style

Compact 12-volt 5-prong relay

Stay within its capabilities. Try to stay 10 to 15% below what the rate is for

HEAVY DUTY LONG WIRES. To safely, easily wire your pump directly to your battery, ensuring your high-pressure fuel pump is getting the voltage it needs. Designed specifically to prevent voltage drops at the fuel pump to maintain constant fuel pump pressure and to prevent fuel pump amperage overloads from damaging the vehicle's electrical system

EASY TO INSTALL. All wires are clearly labeled and color-coded. And an easy-to-follow wiring diagram is included in the package. 10 feet 10 gauge RED wire to +12V battery, 6 feet 10 gauge ORANGE wire to fuel pump, 2 feet 16 gauge BROWN wire to 12V trigger switch, 4 feet 16 gauge BLACK wire to chassis ground

UNIVERSAL FIT 12V SYSTEM. This will work on anything that is 12V activated that does not exceed a 40 amp continuous amperage draw

【30A/40A Relay】 - These 5 pin relays are rated at 12v 30A/40A (NO: 40A, NC: 30A), spdt heavy duty design relay switch.

【Built-in Diode】 - This 12 volt relay has a built-in diode, which aims to consume the induced voltage that is generated by the coil while switching the status of relay, and therefore protect the electric components from being damaged by the induced voltage.

【12AWG Harness】 - The wires which come with this relay socket are 12AWG/16AWG design, the 12 awg wires include red, blue and yellow wires which are the wires for high power terminals of the spdt relay; and 16 awg white and black wires for the coil terminals.

Please check your car before buying![Package Included] The package contains 4 pieces 12V 30A 5 pin relays, the size is about 1.41 x 0.94 x 0.63 inches. Sufficient quantity can meet your daily use and replacement. You can share them with friends and family who need them. These relays are 5 plugs. Please pay attention when ordering.

[High Quality Housing] The automobile relay housing is made of high quality plastic, with good thickness and smoothness, waterproof and flame retardant, safe and secure.

[Silver Alloy Contact] The heavy-duty standard relay for automobile motor adopts silver alloy contact design, which has stronger conductivity and longer service life.

Heavy Duty Continuous Duty Rated Relay with 5-Pin SPDT (Single Pole Double Throw).

12V 250 Amp High Current Carrying Capacity.

Normal Open / Normal Closed Dual Control.

20A contact switching capability.

Multipurpose Relays Fuel Pump Relays Black Car Relays Car Replacement Electrical System Relays Electromechanical Relays.

Suitable model: the model of the multi-purpose relay is G8V-RH-1C7T-R-DC12, suitable for 12V voltage, designed with 5 pins, the relay is classic black.

What You Will Receive: the package contains 8 pieces of G8V-RH-1C7T-R-DC12 power relays, sufficient to meet your daily use and replacement needs, and the quantity is also enough to share with family and friends

Proper Model: the model of multi purpose relay is G8V-RH-1C7T-R-DC12, suitable for voltage of 12V, designed with 5 pins, and the relay is in classic black color; Please notice the model before ordering

Sustained Material: made of quality nylon shells and brass pins, the fuel pump relay is stable in structure, not easy to deform or break, also can stand a certain cold and hot condition, bringing a fluent use experience