The **MV23V3CD-R** is a specific model of a **Mini Vertical Float Switch**, commonly used for liquid level sensing in industrial and commercial applications. These components are electromagnetic in nature and operate based on the interaction between a magnet and a reed switch. --- ## 1. Technical Specifications Below are the typical electronic and mechanical characteristics of the MV23V3CD-R series: | Feature | Specification | | :--- | :--- | | **Switching Voltage** | 200V DC / 240V AC (Max) | | **Switching Current** | 0.5A (Max) | | **Contact Rating** | 50W (Max) | | **Contact Resistance** | 100 mΩ (Max) | | **Operating Temp** | -10°C to +85°C (Standard) | | **Material** | Stainless Steel (typically 304 or 316) | | **Mounting** | 1/8" NPT or M10 Thread | --- ## 2. Core Electronic Components The device consists of three primary electronic/mechanical parts: ### A. The Reed Switch (Internal) The heart of the MV23V3CD-R is a glass-encapsulated **Reed Switch** located inside the central stem. - It consists of two ferromagnetic flexible metal contacts. - In the presence of a magnetic field, the contacts pull together to close the circuit (Normally Open) or push apart (Normally Closed). ### B. The Magnetic Float The "CD-R" designation usually refers to the cylindrical float containing a **permanent magnet**. - As liquid levels rise or fall, the float moves along the stem. - When the magnet reaches the position of the internal reed switch, it triggers the electrical state change. ### C. Lead Wires The unit typically features two UL-rated wires (often AWG 22). - Because this is a passive component (it acts as a switch, not a power source), there is no polarity to worry about unless it is integrated into a specific digital PLC logic circuit. --- ## 3. Circuit Configuration (NO vs. NC) The MV23V3CD-R is often **reversible**. You can change the electronic logic by physically removing the "C-clip" at the bottom, flipping the float upside down, and re-installing it. 1. **Normally Open (NO):** The circuit stays open (off) until the float rises to the magnet's trigger point. 2. **Normally Closed (NC):** The circuit stays closed (on) until the float rises and breaks the connection. --- ## 4. Usage Precautions * **Inductive Loads:** If using this to drive a motor or a solenoid directly, you **must** use a protection diode (DC) or a varistor/RC snubber (AC) to prevent back-EMF from welding the reed switch contacts shut. * **Current Limits:** The 0.5A limit is a "peak" rating. For long-term reliability, it is best used as a signal input for a relay or a microcontroller (like an Arduino or PLC).