The **SES-2HB-R/E** is a specific model of an **Electromagnetic Holder (Door Release)** typically used in fire safety and security systems. It is designed to hold fire doors open during normal operation and release them automatically when a fire alarm is triggered. --- ### 1. Technical Specifications The following table outlines the primary electronic and physical characteristics of the device: | Feature | Specification | | :--- | :--- | | **Operating Voltage** | 24V DC (Standard for Fire Systems) | | **Current Consumption** | Approximately 60mA - 100mA | | **Holding Force** | ~200N to 500N (Varies by specific sub-model) | | **Material** | Steel/Zinc alloy housing | | **Mounting Type** | Wall or Floor mounted (depending on bracket) | | **Release Mechanism** | Power-off to release (Fail-safe) | --- ### 2. Key Electronic Components The device operates on simple yet robust electromagnetic principles: * **Electromagnetic Coil:** The core component consists of a copper wire coil. when 24V DC is applied, it generates a magnetic field that attracts the metal armature plate attached to the door. * **Armature Plate:** A passive metal plate that completes the magnetic circuit. It usually features a "swivel" or "pivoting" joint to ensure it sits flush against the magnet even if the door is slightly misaligned. * **Protection Diode (Flyback Diode):** Most units include an internal diode across the coil to prevent inductive voltage spikes from damaging the fire alarm control panel (FACP) when the power is cut. * **Manual Release Button:** A physical override button located on the housing that breaks the electrical circuit locally to test the door manually. --- ### 3. Operational Logic The SES-2HB-R/E follows a **Fail-Safe** logic, which is critical for life safety: 1. **Normal Condition:** The Fire Alarm Panel provides a constant 24V DC supply. The magnet is energized, holding the door open to allow traffic flow. 2. **Alarm Condition:** The Fire Alarm Panel detects smoke/fire and cuts the power to the 24V circuit. 3. **Release:** The magnetic field collapses instantly, and the door closer (mechanical arm) pulls the door shut to prevent the spread of smoke. --- ### 4. Installation Wiring Diagram *Note: Always refer to the manufacturer's specific schematic before wiring.* ```text [ Fire Alarm Control Panel ] | |----(+) 24V DC ----[ Terminal L1 ] | | |----(-) 0V/GND ----[ Terminal L2 ] ``` ---