The Apollo ORB-HT-51148-APO is a conventional heat detector from the Orbis series, designed for reliable fire detection in environments where smoke detectors are unsuitable. This Class A1R detector utilizes a rate-of-rise temperature sensing mechanism, which allows it to trigger an alarm based on a rapid increase in temperature, as well as a fixed upper temperature limit of 58°C. It is engineered for use in areas with normal temperature fluctuations, such as kitchens, boiler rooms, and loading bays. The detector features a modern, unobtrusive design and is compatible with the Orbis TimeSaver Base, which simplifies and speeds up the installation process. Its wide operating voltage and robust construction make it a versatile and dependable choice for a variety of conventional fire alarm systems.