Circuitry is designed to withstand electrical over-stress conditions such as reverse polarity, ESD transients, and jump start voltage extremes. 100% tested prior to shipping for continuous current load, quiescent current, voltage drop, pull-in current, voltage and hysteresis. 100% tested for proper fit, form, and function. Copper terminals with aluminum inlay keep electrical resistance low and still provide benefits for wire bonding and corrosion protection. Aluminum heat sink provides excellent corrosion resistance and thermal conductivity.