40A Auto Car Relay JD2912 with 4Pin and 5Pin options, compatible with DC voltages from 12V to 72V (including 24V, 36V, 48V). Broad compatibility for vehicle electrical systems and control networks. Mounting hole provided for easy installation in automobile control circuits, reducing wiring time and space requirements. Coil power is 1.8W, delivering stable switching with low heat generation for reliable operation in automotive environments. 40A current rating supports relatively high current loads, suitable for common automotive components such as headlights, fans, pumps, and other power accessories. Flexible configuration to fit your wiring setup: choose 4Pin or 5Pin variant and use the 72V option for higher voltage systems when needed. Use scenarios - 12-24V vehicles: switch high-current loads like headlights, auxiliary cooling fans, or power distributors. - 24-48V systems: control pumps, heaters, or other mid-range accessories in commercial or larger vehicles. - 72V applications: employ the 5Pin variant for specific connections or higher voltage control requirements. Reliable automobile control solution for diverse needs, offering clear compatibility, simple installation, and solid performance.