“This Harmony RUM RC circuit has a control coil voltage of 110V to 240V AC.””It is compatible with RPZ sockets with 3, 4 changeover contacts and RUZ sockets with 2, 3 changeover contacts.””This protection module enables safety to your relay which helps to protect both people and system from electrical shock.””Simple modular design facilitates post installation servicing, modification and adaption of machines by non-specialists.””It can be matched with any relay socket from RPZ and RUZ ranges.”