Looking for the Best fls821 Relay for your vehicle? Want to boost your vehicle’s engine life? So the answer to all your questions is here bcoz We have mentioned the 10 Best Fls821 Relay 12v 40a of 2022 in this Article.

Top 10 Fls821 Relay 12v 40a List

RankPictureNameRatingShops
#1

MICTUNING LED Light Bar Work Light

  • Wiring Harness Relay 40 Amp
9.7
MICTUNING LED Light Bar Work Light Check Price
#2

LAMPHUS Off Road LED Light

  • Bar Wiring Harness 4-Pin Relay
9.8
LAMPHUS Off Road LED Light Check Price
#3

WMYCONGCONG 5 PCS DC 12V 40A 4 Pin Terminal SPDT Relay

  • for Car Truck Automotive
9.5
WMYCONGCONG 5 PCS DC 12V 40A 4 Pin Terminal SPDT Relay Check Price
#4

ESUPPORT 12V 40A Car Automotive Van Boat Truck 4 Pins SPST Alarm Relay

  • Air Heavy Pack of 5
9.6
ESUPPORT 12V 40A Car Automotive Van Boat Truck 4 Pins SPST Alarm Relay Check Price
#5

uxcell Black DC 12V 40A 4 Pin Terminal SPDT Relay

  • for Car Automotive
9.3
uxcell Black DC 12V 40A 4 Pin Terminal SPDT Relay Check Price
#6

EHDIS Car Relay 4 Pin 12v 40amp Spst Model No.: JD2912-1H-12VDC 40A 14VDC,

  • Auto Switches & Starters,Pack of 2
9.4
EHDIS Car Relay 4 Pin 12v 40amp Spst Model No.: JD2912-1H-12VDC 40A 14VDC,Check Price
#7

Nilight 50003R Automotive Set 5-Pin 30/40A 12V SPDT

  • with Interlocking Relay Socket
9.7
Nilight 50003R Automotive Set 5-Pin 30/40A 12V SPDT Check Price
#8

Gebildet JD1912 Car Relay

  • Harness 12V 40A 4 Pin SPST Harness Sockets
9.8
Gebildet JD1912 Car Relay Check Price
#9

1 Pack 40/30 AMP 12 V DC Waterproof Relay

  •  Automotive Relay
9.5
1 Pack 40/30 AMP 12 V DC Waterproof RelayCheck Price
#10

uxcell Car Motor DC 12V 40A 4 Pin SPST Relay

  • 2 Pcs
9.7
uxcell Car Motor DC 12V 40A 4 Pin SPST RelayCheck Price

10 Best Fls821 Relay 12v 40a Reviews 2022

1. MICTUNING LED Light Bar Work Light Wiring Harness Relay 40 Amp

MICTUNING LED Light Bar Work Light Wiring Harness Relay 40 Amp

Product Details

  • MICTUNING 12V 40A relay
  • Suitable for Most LED light bar wiring harness kit
  • Easy to use
  •  MICTUNING 5Pack Relay.

As an electrical control device, the relay is in fact an “automatic switch” that controls the operation of a large current through a small current, so that it has functions of automatic regulation, safety protection as well as circuit conversion.

Many automobile and motor devices need a relay to control the circuit, such as led work light, fog lamps, starter, wiper, fans, speakers, central locking, alarm, electric windows, etc.

2. LAMPHUS Off Road LED Light Bar Wiring Harness 4-Pin Relay

LAMPHUS Off Road LED Light Bar Wiring Harness 4-Pin Relay

Product Details

  • Replacement Relay for LAMPHUS Cruizer ORWH## Series Wiring Harnesses
  • 4-Pin SPDT
  • 12V 40A
  • LAMPHUS

Having the relay laying on the side with the mounting tab on a flat surface and looking at the terminals, the two terminals on the right-hand side will be used to energize the coil (upper 85, lower 86), and the two terminals on the left-hand side will be for power and load (upper 87, lower 30).

Many automobile and motor devices need a relay to control the circuit, such as led work light, fog lamps, starter, wiper, fans, speakers, central locking, alarm, electric windows, etc.

3. WMYCONGCONG 5 PCS DC 12V 40A 4 Pin Terminal SPDT Relay for Car Truck Automotive

Product Details

  • 12V 40A relay
  •  Car Relay; Model: RTT7114-12
  •  4 Pin
  •  2.7 x 2.4 x 6.3cm / 1.1″ x 0.93″ x 2.5″ (L*W*H

Widely used for various car electronic applications, for a device draws heavy amperage such as for car alarms, remote starts, HID headlights, doors, trunk releases strobe lights, fog lights, stereos, fans, air horns, and much more.

as long as it has 4 pins running in the same direction same rating. Those two things are correct then whichever one you are replacing should either have a little drawing diagram on top of it or on the side side of it. just match it up to this one looking for a normally open or normally closed.

4. ESUPPORT 12V 40A Car Automotive Van Boat Truck 4 Pins SPST Alarm Relay Air Heavy Pack of 5

ESUPPORT-12V-40A-Car-Automotive-Van-Boat-Truck-4-Pins-SPST-Alarm-Relay-Air-Heavy-Pack-of-5

Product Details

  • Voltage: 12V, Current: 40A
  • Pin Number: 4 Pin, SPST contact type
  • Mechanical life of 100,000+ cycles
  • High 40A coil capacity

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.

This kit can be used to install electric cooling fans,Electric fuel pumps,Electric water Pumps,Shaved door handles solenoids,Trunk solenoids,Horns.

5. uxcell Black DC 12V 40A 4 Pin Terminal SPDT Relay for Car Automotive

uxcell Black DC 12V 40A 4 Pin Terminal SPDT Relay for Car Automotive

Product Details

  • External Material : Plastic
  • Easy to use,4 Pin relay just Plug in connector and secured
  • 40A high switching capability.
  • Package Content : 1 x Car Relay

It is used when a device draws heavy amperage such as car alarms, remote starts, HID headlights, pop doors, trunk releases strobe lights, fog lights, stereos, fans, and much more.

Widely used for various car electronic applications, for a device draws heavy amperage such as for car alarms, remote starts, HID headlights, doors, trunk releases strobe lights, fog lights, stereos, fans, air horns, and much more.

6. EHDIS Car Relay 4 Pin 12v 40amp Spst Model No.: JD2912-1H-12VDC 40A 14VDC, Auto Switches & Starters,Pack of 2

Product Details

  • Brand new heavy duty 4-prongs SPST relays
  • Use optional Relay Harness, or female Crimp Connectors
  • Mechanical life of 10,000+ cycles
  • Package Include: 2 x 40A 4-Pin 12V Vehicle Relays

These are just standard relays. The circuit you are controlling is NO (no power) until a control signal is received.

Widely used for various car electronic applications, for a device draws heavy amperage such as for car alarms, remote starts, HID headlights, doors, trunk releases strobe lights, fog lights, stereos, fans, air horns, and much more.

Normally open 40A/14V DC and normally close 30A/14V DC. Suitable for Nilight LED light bar wiring harness kit, Durable relay and harness socket with 5 wires; Made by high-grade materials to ensure superior quality and long lifespan.

Unique male-female slot design, easy to connect the relay with harness socket, clean and neat after installation.

The relay sockets come with different colors for loads/accessories, simple and convenient wiring.

8. Gebildet JD1912 Car Relay Harness 12V 40A 4 Pin SPST Harness Sockets with Color-Labeled Wires for Automotive Truck Van Motorcycle Boat (Pack of 2)

Gebildet-JD1912-Car-Relay-Harness-12V-40A-4-Pin-SPST-Harness-Sockets-with-Color-Labeled-Wires-for-Automotive-Truck-Van-Motorcycle-Boat-Pack-of-2

Product Details

  • Brand new heavy duty SPST(Single Pole Single Throw) relays
  • Minimum operating voltage 8V
  • Small size/Low power consumption/High contact voltage/ High sensitivity.
  • Contact Material: Ag Alloy / Contact Resistance: ≤ 100MΩ.

Customer satisfaction is our greatest pursuit, If you found our products don’t work or not so good quality as you think, Please contact us without hesitation. We can resend you a new item or 100% refund money as you like.

Life Expectancy Electrical: 100,000 Operation, Life Expectancy Mechanical: 10,000,000 Operation. Minimum operating voltage 8V, corresponding minimum operating current is 100mA; Standard operating voltage 12V, corresponding standard operating current is 150mA.

9. 1 Pack 40/30 AMP 12 V DC Waterproof Relay and Harness – Heavy Duty 12 AWG Tinned Copper Wires, 5-PIN SPDT Bosch Style Automotive Relay

1 Pack 40/30 AMP 12 V DC Waterproof Relay and Harness - Heavy Duty 12 AWG Tinned Copper Wires, 5-PIN SPDT Bosch Style Automotive Relay

Product Details

  • 12 AWG tinned copper wires for pin 30, 87, 87a
  • 12V waterproof 5-prong relay 
  • Excellent waterproof 
  • SPDT relay

SPDT relay: it has both normally open and normally closed terminals, terminal 87A is powered when the relay is inactive and switches the power to terminal 87 when the relay is activated.

12v relays can operate with anywhere between 9v and 15.6v, so if you are looking for a 14v 5-pin relay, this is what you want, 12 AWG tinned copper wires for pin 30, 87, 87a. 16 AWG tinned copper wires for pins 85 and 86. Length: 5.1in.

10. uxcell Car Motor DC 12V 40A 4 Pin SPST Relay 2 Pcs

uxcell-Car-Motor-DC-12V-40A-4-Pin-SPST-Relay-2-Pcs

Product Details

  • Product Name: Car Relay; Package Content: 2 Pcs x Car Relay
  • Color: Black; Material: Plastic,Metal
  • Dimension: 60 x 25 x 22mm / 2.4″ x 1″ x 0.87″ (L*W*H); Contact Type: SPST
  • Coil Voltage: DC 12V

It is used when a device draws heavy amperage such as car alarms, remote starts, HID headlights, pop doors, trunk releases strobe lights, fog lights, stereos, fans, and much more.

Relay is used for many car electronic applications to turn on/off almost any device. Features: 4 Pin, SPST contact type, 12V DC coil voltage.

FAQ’s About Fls821 Relay 12v 40a

Can this turn on an accessory while turning off another one?

These are relays that you can wire however you want.

Do you make it for connect to the car stereo?

If you want to connect with your car stereo then You don’t need a relay, you need a fuse box.

Can these be used with a 24v system?

It says max 14 volts in the description, so maybe it is better to not use these for a 24v system.

Conclusion

I hope you liked our article and got the best Fls821 Relay 12v 40a of 2022 for your vehicle to improve its life.