The HERZ 1810000 is a genuine safety switch designed for underfloor heating control sets, specifically the 8100 series. This essential component provides critical protection against system overheating. It features a fixed switching temperature of 50°C with a 5 K switching differential, ensuring reliable operation. The switch is rated for a maximum operating temperature of 90°C and a maximum operating pressure of 10 bar. It includes a capillary sensor with a length of approximately 1000 mm, an immersion sleeve (G 1/2", 100 mm length), and necessary mounting accessories. Electrical connection is 230 V AC, 50 Hz, 6 (2) A, with a protection class of IP 40 and a changeover contact (SPDT).