The **BZ-RX** is a specific series of microswitches manufactured by **Honeywell** (Sensing and Productivity Solutions). These are part of the broader **BZ Series** of standard large-sized snap-action switches, widely used in industrial, medical, and aerospace applications due to their high reliability. --- ### 1. Key Specifications The BZ-RX model is characterized by its electrical ratings and mechanical life. Below are the general specifications for this sub-series: | Feature | Specification | |:---|:---| | **Switch Type** | Standard Snap-Action Microswitch | | **Circuitry** | SPDT (Single Pole Double Throw) | | **Contact Material** | Fine Silver | | **Actuator Style** | Pin Plunger (Basic) | | **Operating Force** | 2.5 N to 3.61 N (Typical) | | **Electrical Rating** | 15A at 125/250/480 VAC | | **Mechanical Life** | Up to 20,000,000 cycles | --- ### 2. Internal Electronic Components While these are mechanical switches, their "electronic" performance depends on high-quality internal architecture: 1. **Beryllium Copper Spring:** Uses a high-performance spring mechanism to ensure fast "snap-action," which minimizes arcing and contact wear. 2. **Silver Contacts:** The "RX" designation often refers to specific contact arrangements or low-energy capabilities (depending on the full suffix), but standard BZ models use fine silver to maintain low contact resistance. 3. **Phenolic Housing:** The external casing is made of high-grade phenolic plastic, which provides excellent electrical insulation and heat resistance. 4. **Screw Terminals:** Most BZ-RX units feature #6-32 UNC binding head screws with cup washers for secure electrical wiring connections. --- ### 3. Connection Diagram The switch operates as a Single Pole Double Throw (SPDT). The wiring logic is as follows: ```text Terminal 1 (COM): Common line Terminal 2 (NC): Normally Closed (connected to COM when idle) Terminal 3 (NO): Normally Open (connects to COM when pressed) ``` ### 4. Application Areas * **Industrial Enclosures:** Used as door interlocks or limit switches. * **Medical Equipment:** High-precision timing and sequencing. * **Aerospace:** High-reliability manual overrides. * **Vending Machines:** Detection of product or coin mechanisms. --- ### 5. Part Number Breakdown Honeywell uses a specific nomenclature for the BZ series: * **BZ:** Standard Basic Switch. * **R:** Standard characteristics (Operating force/Differential travel). * **X:** Specific designator for high capacity or specialized terminal configurations.