Frost thermostat STT900 5127040000

The output would typically switch off ventilators, close outside air flaps, open up air heating valves, switch on air heat pumps, switch off  refrigeration compressors, switch off  air humidifiers, or initiate a visual and/or acoustic frost alarm.
Location of  these items is not critical, even in harsh environments as they are all rated to IP65.

Main characteristics

Switching capacity	10 (2) A, 250Vac gold-plated switching contacts allow signal voltage switching < 24 V
Setting range	-10 °C ...+ 15 °C / 14 °F... 59 °F factory setting to w = 5 °C (41 °F)
Operating difference	2 ± 1 K (3.6 ± 1.8 °F)
Reproducibility	± 0.5 K (± 0.9 °F)
Contact	dustproof micro switch as single-pole potential-free changeover contact. Sensor responding length: ca. 40 cm
Length of capillary tube	0.6 m (2 ft.)
Resetting	automatic
Permissible medium	air
Ambient temperatures:	maximum operating temperature: 70 °C (158 °F) minimum operating temperature: + min. 2 °C (min. 3.6 °F)
Storage / transport	- 30 ...+ 70 °C (- 22 ...+ 158 °F)
Process connection	by mounting clamps (included in the scope of delivery)
Connecting head	plastic, material polyamide, 30 % glass-globe-reinforced, color pure white (similar RAL 9010)
Размеры	120 х 80 х 50 mm
Other materials: Mechanical sheet metal parts Capillary tube Capillary tube filling Switching contacts	galvanized steel copper R 507 Ag / Ni (90% / 10%) gold-plated (3μm)
Electrical connection	0.14 - 2.5 mm²
Cable union	M 20 x 1.5, including strain relie
Protection class	I (according to EN 60 730-1) IP 65 (according to EN 60 529)
Standards	CE conformity, EMC directive 89 / 336 / EWG, Low-voltage directive 73 / 23 / EWG
Output Contact Function	1 - 4 danger of frost / sensor breakage 1 - 2 normal operation