Apollo Intelligent Mains Switching Input/Output Unit provides a single line tolerant circuit (core protocol only) containing one or more normally open contacts connected to a single pair of cables. It also provides a voltage free change over relay output capable of switching mains. Compatible with XP95, Discovery and core protocol digital communication protocols. The Intelligent Mains Switching Input/Output unit complies with the essential requirements of the EMC Directive 2014/30/EU, provided that it is used as described. This unit complies with the essential requirements of the construction products regulation 305/2011/EU.