Using RTK Linden DA149 intrinsically safe relays, control signals and other data can be exchanged between items of equipment in hazardous areas and between hazardous and safe-area equipment. The range includes four models, two of which are designed for safe-area location and two of which can be located within hazardous areas.

Since the relays need very little power, they do not affect operation of other equipment to which they are connected. Additionally, as inputs and outputs are classified as "simple apparatus", system certification is not needed.

The slimline units are universal DIN-rail mounting and can be supplied pre-mounted in standard safe-area or flameproof enclosures as required.