4/5 Pin SPST Fuse Relay 12V 24V 30A Waterproof Car Truck Switch
4/5 Pin SPST Fuse Relay 12V 24V 30A Waterproof Car Truck Switch
4/5 Pin SPST Fuse Relay — Waterproof 12V/24V 30A Car & Truck Switch
Keep your vehicle's electrical circuits running safely and reliably with this heavy-duty 4/5 Pin SPST Fuse Relay. Designed for both 12V and 24V systems, this relay handles up to 30A of current, making it ideal for cars, trucks, SUVs, and other automotive applications. Whether you're wiring auxiliary lights, horns, cooling fans, or other accessories, this relay delivers solid, dependable switching performance.
Key Features
- Dual Voltage Compatibility: Works seamlessly with both 12V and 24V electrical systems for broad automotive use.
- 30A Rating: Handles high-current loads to protect your vehicle's factory wiring from overload.
- SPST Configuration: Single Pole Single Throw design — simple, reliable switching for a wide range of automotive circuits.
- 4 & 5 Pin Options: Choose between 4-pin or 5-pin configurations depending on your wiring needs.
- Waterproof Construction: Sealed design shrugs off splashes, rain, and moisture — built to last in real-world driving conditions.
- Silver Zinc Oxide Contacts: Premium contact material ensures excellent conductivity and long service life.
- 14AWG Pre-Wired Socket: Comes with a 125mm socket wire length for easy plug-and-play installation.
- Built-In Fuse Holder: Integrated fuse protection adds an extra layer of safety to your electrical circuit.
- 5 Color Options: Select from multiple color variants to suit your setup or help identify circuits at a glance.
- Compact Size: Relay measures 35 × 25.5mm — fits neatly into tight engine bay spaces and fuse boxes.
Specifications
- Voltage: 12V / 24V DC
- Max Current: 30A
- Switch Type: SPST (Single Pole Single Throw)
- Pin Configuration: 4-Pin or 5-Pin
- Contact Material: Silver Zinc Oxide
- Relay Dimensions: 35 × 25.5mm
- Socket Wire Length: 125mm
- Wire Gauge: 14AWG
- Available Colors: 5 options
- Waterproof: Yes
What's in the Box?
- 1 × SPST Fuse Relay with Pre-Wired Socket
For guidance on safe automotive electrical wiring and fuse relay installation, visit the U.S. Consumer Product Safety Commission (CPSC) for consumer safety information.
Frequently Asked Questions
Q: What is a 4/5 Pin SPST Fuse Relay and what is it used for in a car or truck?
A: A 4/5 Pin SPST Fuse Relay is an electromechanical switch used in automotive electrical systems to control high-current circuits (such as lights, fans, or horns) from a low-current trigger signal. This 12V/24V 30A relay protects your vehicle's factory wiring by routing high-amperage loads through a dedicated circuit with built-in fuse protection, making it a staple in car and truck wiring projects.
Q: What is the difference between the 4-pin and 5-pin versions of this relay?
A: The 4-pin version is a basic SPST relay with terminals for coil power, coil ground, common (load), and normally open contact — perfect for simple on/off switching. The 5-pin version adds a normally closed (NC) contact, allowing the relay to handle both normally open and normally closed circuit configurations. Choose based on your specific wiring requirement.
Q: Is this relay truly waterproof for engine bay or exterior installation?
A: Yes — this relay features a sealed, waterproof construction designed to resist moisture, rain, and road splash. Its durable housing and silver zinc oxide contacts are built to withstand the demanding environment of an engine bay or underbody installation in both cars and trucks.
Q: What wire gauge is compatible with this fuse relay socket?
A: This relay comes pre-wired with a 14AWG socket harness (125mm wire length). 14AWG wire is well-suited for 30A automotive circuits and is compatible with standard crimp terminals and automotive connectors.