Keep your vehicle's electrical systems running smoothly with this pack of 5 DC 12V 40-Amp 4-Pin SPST automotive starter relays. Designed as reliable replacement relays, these compact units feature copper contacts for consistent conductivity and an 80-ohm coil resistance that ensures stable, dependable switching performance. The single-pole single-throw (SPST) contact configuration delivers straightforward on/off control for a wide range of automotive electrical circuits. Installation is hassle-free thanks to the quick-connect plug-in mount design, requiring no special tools to get up and running. Each relay measures 2.45" in total height and operates automatically at a minimum switching voltage of 12V DC, handling up to 40 amps of current with a coil voltage of 12 volts and a wattage of 1.8 watts. Having a pack of 5 on hand means you'll always have a spare ready for multiple vehicles or projects. Backed by a one-year warranty, these relays are a smart, practical choice for DIY mechanics and automotive enthusiasts alike.