The BT-77DBK is a type of Kawasaki Switch System (KSS) manufactured by Kawasaki Heavy Industries, Ltd. It is designed for use in industrial control systems, offering multiple switching and contact points as well as indicator lights that can be used for monitoring, alarms, and error indication. The BT-77DBK features 6 poles and 8 coils, with 15A/250VAC for 3-phase and 10A/250VAC for single-phase operations, in addition to 10A/125VAC for alarm or indicator lights. It also provides protection against short-circuiting, overload current, and breaking capacity, and is approved to international standards such as IEC, UL, and CCC. This product was listed and approved as a "Kawasaki Designated Product" in 2018, making it a reliable and cost-effective solution for many industrial control applications.