Key benefits High current capacity and reliable switching: Designed for heavy-duty switching with a 40A / 30A contact rating, suitable for controlling high-current automotive and industrial loads without exceeding its limits. Stable, interference-resistant operation: Built to resist electrical interference and deliver consistent performance under varying conditions. Compact, efficient design: Small footprint and low coil power consumption make it easy to integrate where space and energy efficiency matter. Durable and protected: Metal and ceramic construction with a waterproof design and effective heat dissipation reduces risk of overheating and extends service life. Versatile SPDT function: Single Pole Double Throw (SPDT) configuration provides both make and break switching options for flexible control. What this relay does and why you need it Provides dependable switching of high-current circuits in vehicles, industrial equipment, and smart home systems where reliable on/off control is required. Prevents control-circuit overload by isolating low-voltage control signals from high-current loads. Saves space and simplifies wiring thanks to its compact dimensions and integrated socket/cable options. Key specifications Product name: Car Relay Model: JD2914 Coil voltage: DC 14V Contact current: 40A / 30A Type: SPDT (Single Pole Double Throw) Pin count: 5 External materials: Metal, ceramic Color: Black Relay size: 31 x 27 x 25 mm (1.2" x 1.1" x 1") Socket size: 26 x 24 x 22 mm (1" x 1" x 0.9") Cable length: 13 cm (5.2") Practical applications / use scenarios Automotive auxiliary circuits: Switch auxiliary lights, horns, or other high-current accessories in vehicles running a DC 14V electrical system. Industrial control: Control motors, pumps, compressors, or relay-driven contactors in machinery and control panels where interference resistance and thermal management are required. Smart home and building automation: Drive high-current devices such as water pumps, garage door actuators, or heating elements from low-voltage control systems. Installation and handling notes 5-pin SPDT layout simplifies wiring for both normally open and normally closed configurations. Compact relay and matching socket make mounting simple in tight spaces; use the specified socket dimensions to ensure fit. Waterproof design and metal/ceramic construction aid durability, but install according to vehicle or equipment manufacturer guidelines and observe proper fuse protection for the load. This relay combines high-current capability, compact size, and robust construction for reliable switching in automotive, industrial, and smart-home applications.