NEC EM1 Automotive Relay NEC EM1 Automotive Relay features large current capacity (54A 1hour at 20℃ ), high heat resistance, flux tight housing, and is Pb free. Through-hole reflow soldering is available. The EM1 Automotive Relay offers higher switching performance than current relays and is suitable for large inrush current loads, such as lamps, C-R circuits, heaters, fans and pumps, and controls applications in automobiles which require high quality and high performance.