Description
Product Overview
The Casalytics 12 Volt 40 Amp SPDT (Single Pole Double Throw) power relay is a high‑switch‑capacity component designed for modern automotive electrical systems. Constructed with silver‑nickel oxide contact material, the relay delivers excellent conductivity and resistance to corrosion, ensuring consistent performance even under extreme temperature fluctuations. The screw‑type connector provides a secure, low‑resistance connection, while the surface‑mount configuration allows for both socket and panel installation, simplifying retrofits and new builds. Operating at a coil voltage of 12 V DC, the relay automatically engages and disengages, supporting both normally open (NO) and normally closed (NC) circuits for versatile wiring schemes. With a compact package measuring 2.8 × 1.65 × 1.54 inches and a weight of just 2.08 oz, it fits easily into tight engine bays and conforms to OEM specifications for a seamless replacement experience.
Usage
This relay excels in high‑demand environments where reliable power delivery is critical. Ideal for Chevrolet Silverado (2003‑2010), Impala (1994‑2011), GMC trucks (1995‑2009), Buick Lucerne (2006‑2010), Pontiac Grand Prix and many other GM models, it directly replaces part numbers such as 15328864, 12193604, 38860‑86Z40 and more. Install the relay to control A/C compressors, radiator cooling fans, fuel pumps, horns, and windshield defoggers—any load that requires up to 40 A at 12 V. The IP65‑sealed version protects against moisture and dust, making it suitable for under‑hood mounting where exposure to engine heat, oil spray and road debris is common. Technicians and DIY enthusiasts will appreciate the straightforward wiring diagram and the ability to switch between two circuits without additional hardware.
Why Choose Us
Casalytics combines rigorous engineering with strict quality control to deliver a relay that meets or exceeds OEM standards. Each unit undergoes comprehensive testing for coil resistance, contact resistance, and switching endurance, guaranteeing a lifespan that matches the vehicle’s service interval. The use of silver‑nickel oxide contacts provides superior wear resistance compared to standard copper alloys, reducing the risk of arcing and contact pitting. Our surface‑mount design incorporates a robust screw connector that resists vibration‑induced loosening, a common failure point in aftermarket relays. Backed by a 4.6‑star rating from 58 verified customers, the product demonstrates consistent satisfaction in real‑world applications.
Key Features
- High‑current capacity: Handles 12 V/40 A loads for demanding automotive systems.
- SPDT configuration: Provides NO and NC contacts for flexible circuit control.
- Silver‑nickel oxide contacts: Ensure low resistance, high durability and corrosion resistance.
- Surface‑mount with screw connector: Easy installation on both sockets and panels, resistant to vibration.
- IP65‑sealed version available: Protects against moisture, dust and harsh under‑hood conditions.
FAQ
What vehicles are compatible with this relay?
The relay is a direct replacement for many GM models, including Chevrolet Silverado (2003‑2010), Impala (1994‑2011), GMC trucks (1995‑2009), Buick Lucerne (2006‑2010) and Pontiac Grand Prix, among others. It matches multiple OEM part numbers, making it a versatile fit for a wide range of applications.
Can this relay be used for both NO and NC circuits?
Yes, the SPDT design provides one normally open (NO) and one normally closed (NC) contact, allowing you to switch between two circuits without additional relays.
Is the relay suitable for outdoor or wet environments?
The optional IP65‑sealed version is rated to protect against water ingress and dust, making it suitable for under‑hood mounting where exposure to moisture and debris is common.
How do I install the relay?
Mount the relay on a suitable surface using the screw connector, connect the 12 V coil to the control circuit, and wire the load to the NO or NC contacts as required. Follow the wiring diagram provided in the product manual for correct polarity and grounding.
What warranty does Casalytics offer?
Casalytics provides a one‑year limited warranty covering defects in materials and workmanship, ensuring peace of mind for both professional installers and DIY users.
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