Product Design & Development

Rotary Switch

Wednesday, July 23, 2003

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Rotary Switch

The SW44212 pot/switch offers a combination of rotary switch and potentiometer capabilities in a miniature configuration. Dual functionality enables a smaller panel or board footprint for installation, saving space in applications with tight design requirements. The compact all-in-one unit is suitable for aircraft, medical, industrial, and portable instrumentation applications.

The SW44212 features a non-illuminated switch with silver-plated contacts and provides a tactile click for on/off contact confirmation. Switch functions are from beginning of clockwise (CW) normally open (NO) rotation and offer a mechanical rotational life of 50,000 cycles minimum. For added installation versatility, the unit is available with three shaft lengths — 0.5, 0.875, and 2.5 in. — and meets IP67 environmental seal requirements for harsh environments and Mil-Spec requirements including 50 G shock and 10-55 Hz vibration. Operating temperature ranges from -55° to +125°C.

A conductive plastic resistive element provides resistance values from 10 KΩ to 500 KΩ, with an electrical travel of 270 degrees 䔮 degrees. The switch unit is rated at 30 Vdc or 115 Vac, 2 A resistive, 0.5 A inductive. For interface flexibility, the unit is provided standard with EMC terminal solder lugs but can also be provided with through-hole PC board pins for plug-in installations. The entire assembly is packaged into a 0.52 in. square x 0.655 in. depth (behind panel) housing.


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