.. DANGER! Caution! Electric Shock! .. When the power is on, DO NOT touch the AC terminals in case an electric shock may occur. .. Make sure the power is disconnected when you check the unit inside. .. CTA series is an OPEN-TYPE device. They are intended for installation completely within an overall panel and are for use in counting or timing application. If it will cause serious injury to workers or damage on other equipments when used in a dangerous environment, please make sure it is installe