Based on this product's specifications, here are some alternatives and similar models
Wired ceiling/wall fixed-temperature heat detector SATEL DCP-100, 65°C, 26 V, 23 mA
Summary description:
SATEL DCP-100 is a wired fixed-temperature heat detector for ceiling or wall mounting with a set trigger point of 65 °C. It operates from AC/DC with 26 V input and draws 23 mA alarm current. The compact unit (108 mm × 49 mm, 94 g) provides a reliable thermal alarm signal for fire detection systems in commercial and residential installations.