The **17TK-26-R** is a specific type of **Rotary Switch**, often referred to in industrial and consumer electronics as a "Band Switch." These components are used to select different modes, circuits, or electrical paths by rotating a central shaft. --- ## 1. Technical Specifications While exact specifications can vary by manufacturer (such as Alpha or local industrial brands), the standard configuration for the 17TK series typically includes: | Parameter | Specification (Typical) | | :--- | :--- | | **Type** | Rotary Switch (Manual) | | **Number of Poles** | 1 Pole | | **Number of Positions** | 2 to 6 (Adjustable or Fixed) | | **Rotation Angle** | 30° or 60° per click | | **Voltage Rating** | 125V AC / 250V AC | | **Current Rating** | 0.3A to 0.5A | | **Shaft Diameter** | Usually 6mm (D-shape or Knurled) | | **Mounting Type** | PCB Mount or Panel Mount | --- ## 2. Component Construction The "17TK" designation usually refers to the physical frame size and mechanical design: * **Wafer Layer:** The body is made of an insulating material (phenolic resin or ceramic) that holds the metal contacts. * **Wiping Contacts:** It uses "make-before-break" or "shorting" contacts to ensure a smooth transition between settings. * **Adjustable Stopper:** Many 17TK models come with a metal washer/ring that allows the user to limit the number of positions (e.g., turning a 12-position switch into a 3-position switch). --- ## 3. Common Applications These switches are found in devices where a user needs to toggle between multiple distinct states: 1. **Audio Equipment:** Selecting between Inputs (CD, Aux, Phono). 2. **Test Instruments:** Changing scales on a Multimeter or Oscilloscope. 3. **Home Appliances:** Speed control for fans or temperature settings for heaters. 4. **DIY Electronics:** Frequency band selection in radio projects. --- ## 4. Part Number Breakdown The suffix **-R** usually denotes a specific variation: * **RoHS Compliance:** Indicates the part is lead-free and meets environmental standards. * **Rotation Type:** Sometimes indicates "Continuous Rotation" (no stop point) or a specific shaft length.