Profile: R-K Electronics, Inc. specializes in electrical control components. Our product line includes single phase voltage relays, three phase voltage relays, AC current relays, pumping, liquid level & safe relays, zero speed sensing relays, electronic timers, relays & sockets and transient voltage filters. Our transient voltage filters are used to suppress the electrical voltage transients that can damage or affect the operation of solid state controls. Our three phase voltage relay is to avoid damage to a motor due to line voltage problem and monitor the line voltage for problem conditions including over voltage, under voltage, phase loss, phase rotation and phase imbalance.