The **BZ-RQ1X** is a high-precision, subminiature basic switch (microswitch) manufactured by **Honeywell**. It belongs to the premium BZ series, which is known for its "large basic" form factor and high reliability in industrial applications. --- ### 1. Key Technical Specifications The BZ-RQ1X is specifically designed for high-sensitivity switching. Below are the primary electronic and mechanical ratings: | Feature | Specification | | :--- | :--- | | **Switch Type** | SPDT (Single Pole Double Throw) | | **Actuator Type** | Overtravel Plunger (Large diameter) | | **Current Rating** | 15 A | | **Voltage Rating** | 125 VAC / 250 VAC | | **Operating Force** | 2.5 N to 3.61 N [9 oz to 13 oz] | | **Termination Style** | Screw Terminals (6-32 screws) | | **Contact Material** | Silver | | **Differential Travel** | 0,01 mm to 0,05 mm [0.0004 in to 0.002 in] | --- ### 2. Electronic Components & Construction The internal architecture of the BZ-RQ1X consists of several critical electronic and mechanical parts: * **Snap-Action Mechanism:** Uses a beryllium copper spring. This allows the contacts to "snap" from one position to another regardless of the speed of the external actuator, preventing arcing and ensuring consistent electrical performance. * **Contacts:** Made of high-grade silver. Silver provides excellent conductivity and is resistant to oxidation at high current levels, making it ideal for the 15A rating. * **Plunger (Actuator):** The "RQ" designation indicates an overtravel plunger. This is a spring-loaded pin that allows for additional movement after the switch has tripped, protecting the internal mechanism from damage if the mechanical force exceeds the trip point. * **Housing:** Built from Phenolic (a thermoset plastic). This material provides high dielectric strength and heat resistance, ensuring the switch does not melt or short-circuit under heavy electrical loads. --- ### 3. Wiring Diagram Logic The BZ-RQ1X features three screw terminals: 1. **COM (Common):** The input terminal for the power source. 2. **NC (Normally Closed):** The circuit is complete when the plunger is at rest. 3. **NO (Normally Open):** The circuit is completed only when the plunger is depressed. ```text [ Terminal Layout ] _____________________ | (Plunger) | | | | | (NC) (NO) (COM) | | O O O | |_____________________| ``` --- ### 4. Application Use Cases Because of its high precision and low differential travel, the BZ-RQ1X is commonly found in: * **Precision Limit Switching:** Sensing the exact position of a machine tool. * **Safety Interlocks:** Ensuring a door or panel is closed before power is applied. * **Timing Devices:** Triggering sequences in industrial automation.