Sumitomo Electric Industries, Ltd. FNS-C101Q003 Pressure Switch

Sumitomo Electric Industries, Ltd. FNS-C101Q003 Pressure Switch is a compact, high-sensitivity control in the FNS family designed for precise monitoring of fluid pressure with a narrow differential. Marketed as FNS-C101Q003 (FNS-C101) through Sumitomo/Saginomiya, it is intended for refrigeration, air conditioning, and various industrial equipment, with the common terminal closing on increasing pressure. It operates over a fluid-temperature range of -20 to 120°C and a pressure range from -0.1013 MPa up to 5 MPa, enabling detection of vacuum to moderate positive pressures. The body is designed for compact installation, with the FNS-C101X family listing a typical dimension around 113.3 mm, aiding panel-mount or compact control-panel integration. The FNS series emphasizes narrow differential operation, making the switch suitable for compressor and valve monitoring, safety interlocks, and other control loops in HVAC and industrial machinery. The Q003 designation identifies a specific electrical/termination subset within the FNS-C101 line, compatible with standard control circuits used in commercial equipment.