Relay Device

Relays and breakers as relay device components.

OBDResource RT911 Automotive Battery Relay Tester - 12V/24V Dual Voltage Diagnostic Tool with Auto Detect, LED Display, 4-Pin & 5-Pin Relay Clips, Green=Normal Indicator for Cars Trucks, DIY Users
Free shipping

OBDResource RT911 Automotive Battery Relay Tester - 12V/24V Dual Voltage Diagnostic Tool with Auto Detect, LED Display, 4-Pin & 5-Pin Relay Clips, Green=Normal Indicator for Cars Trucks, DIY Users

4.8484 sold
$22.99
Upgraded 12V-24V Digital Universal Automotive Battery Relay Tester, 2.8-4.8mm Voltage Tester with LED Display, 1-Button 10-Test-Cycle Compact Mechanic Tool for Vehicle Repair Accessories, Universal Relay Tester

Upgraded 12V-24V Digital Universal Automotive Battery Relay Tester, 2.8-4.8mm Voltage Tester with LED Display, 1-Button 10-Test-Cycle Compact Mechanic Tool for Vehicle Repair Accessories, Universal Relay Tester

4.51.6K sold
Flash sale00:00:00
$26.99
Compact Automotive Relay Tester - Portable Car Vehicle Relays Diagnostic Checker with Batteries, 4-Pin Spin Test, Enhanced Diagnostic Precision, LED Indicator, Red Electronics Tool

Compact Automotive Relay Tester - Portable Car Vehicle Relays Diagnostic Checker with Batteries, 4-Pin Spin Test, Enhanced Diagnostic Precision, LED Indicator, Red Electronics Tool

4.4115 sold
Limited time deal
-50%$5.99$11.98
1pc Relay Puller Pliers with Plastic Grip - Car Maintenance Tool for Relay Removal, Fuse & Car Vehicle Battery Terminal Wiper Remover, Boosts Tool Longevity (Red)

1pc Relay Puller Pliers with Plastic Grip - Car Maintenance Tool for Relay Removal, Fuse & Car Vehicle Battery Terminal Wiper Remover, Boosts Tool Longevity (Red)

2 sold
Limited time deal
$10.43
12V Pre-Wired Fuse Relay Box, 4-Pin 80A Relay Block and Kit, 2 Relays and 6 ATC/ATO Blade Fuses, for Cars Truck Marine Boat Jeep

12V Pre-Wired Fuse Relay Box, 4-Pin 80A Relay Block and Kit, 2 Relays and 6 ATC/ATO Blade Fuses, for Cars Truck Marine Boat Jeep

2 sold
Limited time deal
-37%$17.97$28.51
Upgraded 220W Plastic Welder With Staples, Pure Copper Transformer, Rapid Heating, Plastic Welding Kit, Hot Stapler Kit, Plastic Welder Gun Kit, Car Bumper Repair Kit, Plastic Repair Kit for Car Bumper Kayak Crack Repairs #toolupgrade
Free shipping

Upgraded 220W Plastic Welder With Staples, Pure Copper Transformer, Rapid Heating, Plastic Welding Kit, Hot Stapler Kit, Plastic Welder Gun Kit, Car Bumper Repair Kit, Plastic Repair Kit for Car Bumper Kayak Crack Repairs #toolupgrade

4.5154 sold
-32%$26.70$38.99
Starter Solenoid Relay,Motorcycle Parts,Car Accessories GY6 Starter Solenoid Relay for 4-Stroke Engine 50cc 150cc 200cc 250cc ATV Dirt Bikes Scooters Go Kart Dne Buggys Quad 4 Wheel Pit Bike

Starter Solenoid Relay,Motorcycle Parts,Car Accessories GY6 Starter Solenoid Relay for 4-Stroke Engine 50cc 150cc 200cc 250cc ATV Dirt Bikes Scooters Go Kart Dne Buggys Quad 4 Wheel Pit Bike

4.320 sold
Limited time deal
-37%$10.71$17.00
Professional 12V Car Relay Tester and Diagnostic Tool, automotive relay tester, car circuit tester, Durable Abs Case, Fits 4-Pin and 5-Pin Relays, Quick Fault Detection, and Design

Professional 12V Car Relay Tester and Diagnostic Tool, automotive relay tester, car circuit tester, Durable Abs Case, Fits 4-Pin and 5-Pin Relays, Quick Fault Detection, and Design

1 sold
$9.85
OBDMONSTER RT100 Universal Automotive cordless Relay Tester - 12V/24V Dual Voltages Car Voltage Tester, Rugged Housing, Auto Detect 4-5 Pin Units, LED Indicator, Buzzer Alert, 1-Button Quick Testing | AA Batteries Not Included
Free shipping

OBDMONSTER RT100 Universal Automotive cordless Relay Tester - 12V/24V Dual Voltages Car Voltage Tester, Rugged Housing, Auto Detect 4-5 Pin Units, LED Indicator, Buzzer Alert, 1-Button Quick Testing | AA Batteries Not Included

5.020 sold
-20%$36.79$45.99
Professional 12V Car Relay Tester and Diagnostic Tool, Relay Voltage Tester, Durable Abs Case, Fits 4 Pin and 5 Pin Relays, Fast Fault Detection, Automotive Relay Tester

Professional 12V Car Relay Tester and Diagnostic Tool, Relay Voltage Tester, Durable Abs Case, Fits 4 Pin and 5 Pin Relays, Fast Fault Detection, Automotive Relay Tester

5.019 sold
-48%$11.64$22.39
Automotive 30A Fused Relay Switch Kit - 1/2/5pcs 12V 4/5 Pin SPST Relays with Power Control Wiring, 30a Rating Interlocking Harness Socket Holder for Auto Cars, Trucks (for Automotive Users)

Automotive 30A Fused Relay Switch Kit - 1/2/5pcs 12V 4/5 Pin SPST Relays with Power Control Wiring, 30a Rating Interlocking Harness Socket Holder for Auto Cars, Trucks (for Automotive Users)

4.4432 sold
$14.99
12V Automotive Relay Box 6 Way Relay Fuse Box, with 12 AWG Pre-Wired, Fuse Relay Block Universal Relay Panel

12V Automotive Relay Box 6 Way Relay Fuse Box, with 12 AWG Pre-Wired, Fuse Relay Block Universal Relay Panel

5 sold
Limited time deal
$21.38
Car Circuit Tester - 12V/24V Compact Universal Fit Tool with Relay Testing, Portable 11-15V Test & Battery Diagnostic Checker, Professional Voltage Tool for Car Repair, Father's Day Gift (Sports & Outdoor Leisure Equipment)

Car Circuit Tester - 12V/24V Compact Universal Fit Tool with Relay Testing, Portable 11-15V Test & Battery Diagnostic Checker, Professional Voltage Tool for Car Repair, Father's Day Gift (Sports & Outdoor Leisure Equipment)

4.840 sold
Limited time deal
$5.99
4-Pack Automotive Heavy-Duty Waterproof Relays, 4-Pin 12V 30A Sturdy Standard Auto Relays, Universal Car Accessory for Car Lights

4-Pack Automotive Heavy-Duty Waterproof Relays, 4-Pin 12V 30A Sturdy Standard Auto Relays, Universal Car Accessory for Car Lights

3.021 sold
$8.69
Professional Portable Car Super Buddy Tester - 12/24V Auto Tool for 7 Relay Types, SAE Wiring Check, Circuit Diagnosis, Battery Testing, Accurate Readings for Easy Relay Check Troubleshooting

Professional Portable Car Super Buddy Tester - 12/24V Auto Tool for 7 Relay Types, SAE Wiring Check, Circuit Diagnosis, Battery Testing, Accurate Readings for Easy Relay Check Troubleshooting

4.677 sold
-48%$10.99$20.99
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relay device
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Introduction

Automotive and household relay devices manage high-current circuits safely. A low-power signal activates the internal switch, protecting sensitive controls from overload.

  • Weatherproof housings guard against dust, vibration, and temperature swings.
  • Standard blade or plug-in terminals simplify replacement in existing fuse boxes.
  • LED indicators show real-time status for quick troubleshooting.

Install quality relays to keep electrical systems running smoothly.

FAQs

Options range from 20 A mini relays to 70 A heavy-duty units for winches or lights. Check listing photos, size or model notes, seller details, and current stock for Relay Device before you buy.

Yes, dual-output models allow one trigger to power two separate loads. Check listing photos, size or model notes, seller details, and current stock for Relay Device before you buy.

IP67-rated housings withstand splashes and brief submersion. Check listing photos, size or model notes, seller details, and current stock for Relay Device before you buy.

Swap with a known good relay or use a multimeter to check coil resistance. Check listing photos, size or model notes, seller details, and current stock for Relay Device before you buy.

Minimal warmth is normal; excessive heat signals overload or poor contact. Check listing photos, size or model notes, seller details, and current stock for Relay Device before you buy.