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Item #:
77940036
Relay 12V 40A for Car Automotive Boat Truck, 4-Pin Relay SPST Universal Fit Car Fuse Starter Relay Switch Power- Pack of 4
89% of respondents would recommend this to a friend
Item #:
77940036
TMT 71
Price Details
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Order now and get it around Friday, October 09
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What Stands Out
High Capacity
Handle up to 40A with ease, ensuring reliable performance for automotive and marine applications, making it ideal for starters, lights, and power distribution.
Universal Fit
Designed as a standard 4-pin SPST relay, it is compatible with most vehicles and convenient for DIY projects, providing versatility for various installations.
Pack of 4
Cost-effective bundle offering four relays, perfect for multiple applications or replacements in cars, trucks, and boats, ensuring you have spares on hand when needed.
Product Details
| Connector Type | Surface Mount |
| Contact Type | Normally Open |
| Current Rating | 40 A |
| Mounting Type | Surface Mount |
| Operation Mode | Automatic |
| Wattage | 480 watts |
| Coil Voltage | 12 volts_of_direct_current |
| Contact Current Rating | 40 A |
| Minimum Switching Voltage | 12 volts_of_direct_current |
| Contact Material | Silver Nickel Oxide |
| Brand Name | AICARS |
| Number of Items | 4 |
| Manufacturer | AICARS |
| Part Number | AL202431-1 |
| Specification Met | IEC/EN 60947 |
| Item Weight | 0.5 lbs (230 grams) |
Who Should Buy?
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Automotive Enthusiasts
Ideal for DIY vehicle projects, providing reliable power control for various automotive applications and accessories.
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Boat Users
Perfect for boat users needing to control high-power electronics and systems efficiently with minimal installation hassle.
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Heavy-Duty Trucks
Suitable for heavy-duty trucks requiring robust relays to handle high-powered electrical systems and starter functions.
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Casual Users
Not recommended for users unfamiliar with electrical systems, as incorrect installation may lead to malfunctions or damage.
Product Description
Relay 12V 40A for Car Automotive Boat Truck, 4-Pin Relay SPST Universal Fit Car Fuse Starter Relay Switch Power- Pack of 4
Have any Query? Chat with us
Customer Questions & Answers
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Question:
What is a 4-Pin Relay and how does it work?
Answer: A 4-Pin Relay is an electromechanical switch that allows you to control a high-power load with a low-power signal. It consists of four terminals: two for the coil control circuit and two for the switching circuit. When a voltage is applied to the coil pins, it energizes the relay, closing the circuit for the load. This makes it ideal for automotive, boat, and truck applications where managing high current is necessary without risking damage to the main control circuit. -
Question:
Can I use the 12V 40A Relay for both automotive and marine applications?
Answer: Yes, the 12V 40A Relay is suitable for both automotive and marine applications. It is designed to handle high currents typically found in cars and boats, making it versatile for controlling lights, horns, and motors. Whether you're integrating it into your car's electrical system or using it on a boat, this relay ensures reliable performance in demanding environments, ensuring longevity and operational safety. -
Question:
What does SPST stand for in the context of this relay?
Answer: SPST stands for Single Pole Single Throw. This type of relay has one input and one output, functioning as a simple on/off switch. It is ideal for controlling straightforward devices where you only need to complete or break a circuit. This is particularly useful in scenarios like turning on headlights or activating a starter motor in vehicles. -
Question:
How do I install the 4-Pin Relay in my vehicle?
Answer: Installing a 4-Pin Relay involves connecting the pin labeled 'coil' to a power source and the ground, while connecting the load to the common and normally open (or closed) pins. It's crucial to consult your vehicle's electrical schematics for specific wiring instructions. Proper installation ensures that your electrical components operate without faults while maximizing the life of your relay by avoiding overheating. -
Question:
What are common applications for the 12V 40A Relay?
Answer: Common applications for the 12V 40A Relay include operating electric fans, controlling lighting systems, and engaging starter motors in vehicles. In boat settings, they can be used to activate pumps and navigation lights. This relay's ability to manage high current loads makes it a key component in ensuring these essential systems function effectively, enhancing both safety and convenience in your automotive or marine setup. -
Question:
Is the 4-Pin Relay suitable for use with LED lights?
Answer: Yes, the 4-Pin Relay is suitable for use with LED lights. It can manage the current required for LED lighting systems, ensuring stable and reliable operation. When installing LED lights, this relay helps prevent flickering and ensures a consistent power supply, which is especially important as LEDs can be sensitive to electrical fluctuations. -
Question:
What is the maximum load that the 12V 40A Relay can handle?
Answer: The 12V 40A Relay can handle a maximum load of 40 amps at 12 volts, which makes it suitable for a wide range of heavy-duty applications. This high capacity allows it to control larger electrical loads, such as automotive cooling fans, high-powered lights, or motors, without being overloaded, ensuring reliable performance over extended use. -
Question:
Can I use this relay for custom automotive wiring projects?
Answer: Absolutely! The 12V 40A Relay is perfect for custom automotive wiring projects. Its universal fit allows you to integrate it into various setups, whether you're building a custom lighting system or a complex auxiliary power unit. These relays provide a reliable way to manage higher voltages and currents in modifications, helping ensure your projects are both efficient and safe. -
Question:
Where can I buy Relay 12V 40A for Car Automotive Boat Truck?
Answer: You can purchase the Relay 12V 40A for car, automotive, boat, and truck applications at Ubuy in Turkmenistan. This platform offers a variety of electronic components, including high-quality relays, simplifying your search for essential automotive parts and enhancing your shopping experience. -
Question:
Are these relays sold individually or in packs?
Answer: These relays are sold in packs, specifically a pack of four. Purchasing in bulk is economical and ensures that you have spare relays on hand for multiple applications or future projects. This is particularly beneficial for those involved in automotive repairs or custom builds, allowing easy replacements or upgrades without needing to reorder frequently.
AICARS Accessory Power Editorial Review
Relay 12V 40A for Car Automotive Boat Truck is a versatile solution designed for efficient operation in automotive applications. This universal fit relay features a normally open contact type and can handle a current rating of 40 A, making it suitable for various high-power devices in cars, boats, and trucks. With a coil voltage of 12 volts DC, it operates automatically and meets IEC/EN 60947 specifications, ensuring reliability and safety. Users appreciate its easy installation due to the surface mount design, which facilitates smooth integration into different systems, providing a robust power switch option for anyone looking to replace old relays or add new functionality.
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Pros
- Handles up to 40A current for high power devices
- Surface mount design allows for easy installation
- Normally open contact type for versatile use
- Reliable silver nickel oxide contact material
- Automatically operates for efficient performance
Cons
- Limited to 12V applications only
Platform Trust & Buyer Confidence
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9 September 2026 · via Trustpilot
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TMT 71
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Features & Benefits
- High quality car relay with silver alloy pins and pure copper coils
- Stable and sensitive contacts to resist contact bonding
- Perfect for cars and motorcycles
- Widely used for various applications like car alarms, headlights, trunk releases, and more
- Compact dimension: 6.2x2.6x2.2cm
- Package includes 4pcs of car relays
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