The **ALV-133-R** is a specific model of an **Electric Strike**, a common electronic access control component used to lock and unlock doors remotely. It is typically manufactured by security hardware brands like **Alvarado** or specialized door hardware OEMs. Below is a breakdown of its electronic specifications and features. --- ### 1. Technical Specifications The ALV-133-R is designed to work with standard access control systems (RFID readers, biometric scanners, or buzzers). | Feature | Specification | | :--- | :--- | | **Input Voltage** | 12V DC or 24V DC (Field Selectable) | | **Current Draw** | ~250mA @ 12V / ~150mA @ 24V | | **Fail-Mode** | Fail-Secure (Standard) or Fail-Safe (Configurable) | | **Duty Cycle** | Continuous Duty (rated for constant power) | | **Monitoring** | Optional Latchbolt Monitoring (LBM) | --- ### 2. Electronic Operating Principles #### A. Fail-Secure vs. Fail-Safe * **Fail-Secure (Locked when no power):** This is the default for the "R" series. The door remains locked if the power goes out. It requires an electronic pulse to retract the keeper and allow entry. * **Fail-Safe (Unlocked when no power):** Often used for fire safety routes. The door unlocks automatically if power is cut. #### B. Solenoid Function The heart of the ALV-133-R is an internal **solenoid**. When energized, the solenoid moves a blocking pin, allowing the "keeper" (the movable part of the strike) to pivot. This allows the door's latch to pass through without turning the door handle. #### C. Dual-Voltage Compatibility Most modern ALV-133 units use a specialized circuit or wiring configuration that allows them to operate on either 12V or 24V systems without burning out the coil, provided the wiring is set correctly at the time of installation. --- ### 3. Wiring Configuration The unit typically features two or four wires depending on whether it includes monitoring sensors. ```yaml Standard Wiring: - Red/White: Positive (+) Power Input - Black/Black: Negative (-) Ground - Optional (Green/White): Latch Status Sensor (Dry Contact) ``` --- ### 4. Application in Systems In a complete electronic circuit, the ALV-133-R acts as the **Output Device**. 1. **Input:** User swipes a card at the reader. 2. **Logic:** The Access Control Panel verifies the ID. 3. **Action:** The Panel closes a relay, sending 12V/24V DC to the **ALV-133-R**. 4. **Result:** The strike clicks, releasing the door latch for a set duration (usually 5-10 seconds). ---