Based on technical specifications for industrial electronic components, the **WJM-133-R** typically refers to a specialized **M12 Industrial Circular Connector** or a specific **Reed Switch/Magnetic Proximity Sensor** module, depending on the manufacturer (often associated with brands like *Walsin* for capacitors or *WJ* for connectors). However, in the context of general electronics, this part number most frequently identifies an **SMC-type or Reed Switch Sensor** used in pneumatic and automation systems. --- ### 1. Technical Specifications The following table outlines the typical electrical characteristics for a "133-R" series electronic sensor/switch: | Feature | Specification | | :--- | :--- | | **Switch Type** | Reed Switch (SPST, Normally Open) | | **Operating Voltage** | 5V to 240V AC/DC | | **Max Switching Current** | 100mA | | **Contact Rating** | 10W Max | | **Internal Voltage Drop** | 2.4V Max | | **Indicator Lamp** | Red LED (Standard) | | **Response Time** | Max 1ms | --- ### 2. Key Electronic Components The WJM-133-R consists of several internal sub-parts that dictate its function: 1. **Magnetic Reed:** Two ferromagnetic blades encapsulated in a glass tube. They pull together (close the circuit) when a magnetic field (from a piston or magnet) is detected. 2. **LED Indicator:** A surface-mount diode that illuminates when the circuit is closed, providing visual feedback for troubleshooting. 3. **Protection Resistor:** Limits current to the LED to prevent burnout during high-voltage spikes. 4. **Varistor/Zener Diode:** Often included in the "-R" (Resistive/Regulated) variants to protect the reed contacts from inductive kickback or voltage surges. --- ### 3. Application and Wiring These parts are primarily used to detect the position of cylinders in hydraulic or pneumatic machinery. #### Wiring Logic: * **Brown Wire:** Positive (+) / Live * **Blue Wire:** Negative (-) / Neutral * **Load:** Must be connected in series. Connecting the WJM-133-R directly across a power supply without a load will destroy the internal reed switch. --- ### 4. Part Number Breakdown (Typical) * **WJM:** Manufacturer Series Prefix. * **133:** Housing style/Size (M12 or specialized bracket mount). * **R:** Indicates a "Reed" type sensor or "RoHS" compliance depending on the catalog. ---