To make a normally closed reed relay, a magnet is placed inside the coil. It is centered on the reed switch contact gap and in parallel with the switch. For maximum magnetic efficiency, the magnet is placed on the glass of the reed switch. Once in place, each of the two reeds within the reed switch become magnetized, but with opposite polarity. Being of opposite polarity, the north and the south at the reed switch gap attract each other causing the reeds to close.