The **GSA8-R** is an addressable relay module used in fire alarm systems, specifically designed for use with Kidde/Edwards (EST) life safety control panels. It allows the system to switch external circuits, such as fans, dampers, and door holders. --- ### 1. Key Electronic Components & Specifications The electronic architecture of the GSA8-R focuses on two main areas: the **Signaling Line Circuit (SLC)** interface and the **Relay Output**. | Component | Description | | :--- | :--- | | **Microprocessor** | Manages digital communication with the control panel and performs self-diagnostics. | | **Addressable Logic** | Features a unique serial number for electronic mapping. It does not use manual DIP switches. | | **Form C Relay** | Provides a set of dry contacts (Normally Open/Normally Closed) for switching high-current loads. | | **LED Indicator** | A Red/Green LED used to indicate normal status (flicker) or active state (steady). | ### 2. Electrical Ratings Below are the critical electronic operating parameters: | Parameter | Specification | | :--- | :--- | | **Operating Voltage** | 15.2 to 19.95 Vdc (from SLC loop) | | **Standby Current** | 100 µA | | **Activated Current** | 100 µA | | **Contact Rating (Resistive)** | 2.0 Amps @ 30 Vdc; 0.5 Amps @ 120 Vac | | **Circuit Type** | Class B or Class A (SLC) | --- ### 3. Wiring Configuration The module interfaces with external hardware using standardized terminal blocks. ```yaml Terminal Connections: 1 & 2: SLC Input (From Panel or Previous Device) 3 & 4: SLC Output (To Next Device) 5: Normally Open (NO) Contact 6: Common (C) Contact 7: Normally Closed (NC) Contact ``` ### 4. Core Features 1. **Electronic Addressing:** The module is programmed with a unique address via the panel software or a handheld tool, eliminating the need for mechanical switches which can corrode over time. 2. **Mapping Capability:** It supports the "Signature" series diagnostic tools, allowing the panel to map the exact physical location of the relay on the loop. 3. **Non-Volatile Memory:** Stores its identification and serial number even during total power loss. ---