Functional Devices, Inc., Russiaville, Indiana has been manufacturing quality electronic devices in the United States of America since 1969. Functional Devices began manufacturing products for the Alarm industry but eventually transferred technology to the Building Controls market. Functional Devices' current products include commercial energy management products, relays, current sensors, contactors, enclosures, sub-panels, power supplies, transformers, and accessories. FDI is the original manufacturer of the RIB® - Relay In A Box product line of prepackaged multi-purpose relays. Functional Devices has established itself as a leader in the HVAC and energy management industry and continues the business tradition of providing high quality, low cost products emphasizing excellent customer service and satisfaction.