The **BZ-R-P4** is a specialized precision snap-action switch manufactured by **Honeywell** as part of their BZ Series. It is widely recognized for its reliability in industrial and aerospace applications. --- ### Technical Specifications The "P4" suffix typically denotes specific terminal or plating configurations, but the core electronic characteristics remain consistent with the high-precision BZ line. | Parameter | Specification | | :--- | :--- | | **Switch Type** | Standard Precision Snap Action (Basic Switch) | | **Circuitry** | SPDT (Single Pole Double Throw) | | **Current Rating** | 15 Amps | | **Voltage Rating** | 125 VAC / 250 VAC | | **Actuator Type** | Pin Plunger | | **Termination Style** | PC Terminals (P-style usually refers to printed circuit mounting) | | **Contact Material** | Silver | | **Operating Force** | 2.5 N to 3.61 N (Typical) | --- ### Internal Electronic Components 1. **The "Snap-Action" Mechanism:** Unlike a standard toggle, the BZ-R-P4 uses a **beryllium copper spring** mechanism. This ensures that the transition between "Normally Closed" (NC) and "Normally Open" (NO) happens almost instantaneously, regardless of how slowly the plunger is pressed. This prevents arcing and extends contact life. 2. **Contact Points:** The contacts are generally made of **Silver**. Silver is used for its excellent electrical conductivity, though it is prone to slight oxidation. The snap-action mechanism provides a "wiping" motion that cleans the contacts during every cycle. 3. **Housing Material:** The outer shell is molded from **General Purpose Phenolic**. This material is an excellent electrical insulator and can withstand high temperatures and mechanical stress without deforming. 4. **Terminal Interface:** The "P4" variant is specifically designed for integration into circuitry. The terminals are engineered for stability during soldering to ensure a low-resistance path between the switch and the PCB (Printed Circuit Board). --- ### Operating Logic (SPDT) The switch operates on a three-terminal logic system: * **COM (Common):** The input power source. * **NC (Normally Closed):** The circuit is complete when the plunger is at rest. * **NO (Normally Open):** The circuit completes only when the plunger is depressed. ---