The **W2SP-21B-R2/Q** is a specific variant of an industrial-grade illuminated pushbutton switch, typically associated with the **W2 series** (often manufactured by companies like **DECA SwitchLab** or similar industrial component brands). This part is designed for control panels, machinery, and automation systems. --- ## Technical Specifications Breakdown The part number can be broken down into specific electronic and physical characteristics: | Component Feature | Description | | :--- | :--- | | **Series (W2)** | 22mm Diameter industrial switch series. | | **Type (SP)** | Standard Pushbutton (Momentary or Latching, depending on sub-type). | | **Contact Block (21)** | Typically indicates a **1NO (Normally Open) + 1NC (Normally Closed)** configuration. | | **Illumination (B)** | Indicates an **Illuminated** type, usually using an LED module. | | **Color (R)** | Denotes a **Red** actuator/lens. | | **Voltage (2)** | Usually signifies **24V AC/DC** operation for the LED. | | **Safety Rating (/Q)** | Often denotes a specific quality certification (like UL/CE) or "Quick-connect" terminals. | --- ## Key Electronic Components ### 1. Contact Block The "21" in the part number refers to the electrical contacts. * **1NO (Normally Open):** The circuit is open until the button is pressed. * **1NC (Normally Closed):** The circuit is closed until the button is pressed (often used for stop functions). * **Rating:** These are typically rated for **10A at 250VAC**, making them suitable for direct motor control or PLC inputs. ### 2. LED Illumination Module * **Voltage:** Designed for 24V circuits, common in industrial PLC environments. * **Current Draw:** Low power consumption (typically <20mA). * **Replaceability:** The LED bulb is often a "Ba9s" or integrated LED chip that can be replaced from the rear of the panel. ### 3. Mounting and Physical Interface * **Hole Diameter:** 22mm (Standard industrial size). * **Protection Rating:** Usually **IP65**, meaning it is protected against dust and low-pressure water jets. * **Terminals:** Screw-type terminals or quick-connect tabs for wiring. --- ## Typical Applications 1. **Emergency Stop / Stop Buttons:** Due to the red color and NC contact. 2. **Status Indication:** The integrated LED allows the button to glow when a process is active or faulted. 3. **Control Panels:** Used in CNC machines, conveyor belts, and power distribution boards.