Description:
This is a gas/liquid expansion-type temperature switch manufactured by WIKA, a German instrumentation company based in Klingenberg.
The unit combines a local dial thermometer head with a remote capillary sensing bulb, designed to be inserted into a pipe, tank, or vessel via a threaded thermowell.
Internally, temperature-driven expansion of the fill fluid in the capillary/bulb system actuates a built-in microswitch, which opens or closes an electrical circuit at a pre-set temperature — used for alarm, control, or safety-interlock purposes.
Specs (from nameplate):
Manufacturer: WIKA, Alexander-Wiegand-Str. 30, 63911 Klingenberg, Germany
E-Nr. (order/works number): 220807 (partially obscured)
Type: SCT5900K105-0U
Electrical rating: 5 A, 250 V AC, non-inductive (Induktionsfrei); 1 A pilot duty
Switch configuration: SPDT-style microswitch, terminal points 1/2/3, with “S1” representing the switch contact set
Certifications: CSA, UL, CE
Manufacture date code: 07.02.08 (7 Feb 2008), batch 0010
Construction: Stainless-steel/brass capillary, and sensing bulb with flexible armored sheathing, compression-fitting process connection
