This dual channel speed switch senses frequency via seperate inputs from either 110/230V 50/60Hz source or a Magnetic Pick-Up. Terminals are provided for 12 and 24Vdc operation and relay phasing together with latch / de-latch functionality are selected via terminal links. Resin encapsulation provides high resistance to vibration, humidity and handling. Although typically used in engine applications they are suitable for use with many types of rotating machine. Build options include 400Hz sensing and customised designs are available to order.