The **G-95-R** refers to a high-performance **Solid State Relay (SSR)**, typically manufactured by brands like *Crydom* or specialized power electronics firms. It is designed to switch heavy AC loads using electronic semiconductors rather than mechanical contacts. --- ### 1. Key Electronic Specifications Below are the typical technical parameters for a G-95-R series relay: | Component/Feature | Specification | | :--- | :--- | | **Control Voltage (Input)** | 3 - 32 VDC (Typical Logic Level) | | **Load Voltage (Output)** | 24 - 280 VAC | | **Maximum Load Current** | 95 Amperes | | **Switching Type** | Zero-Crossing (Reduces EMI/RFI) | | **Isolation** | 4000 Vrms (Input to Output) | | **Housing Style** | Hockey Puck (Panel Mount) | --- ### 2. Internal Electronic Components The G-95-R is composed of several critical semiconductor stages: 1. **Opto-Isolator (Input Stage):** * An internal LED and phototransistor/triac. This ensures the high-voltage AC side is electrically separated from the low-voltage DC control signal, protecting the user and the controller (PLC/Arduino). 2. **Zero-Crossing Trigger Circuit:** * A logic circuit that waits for the AC sine wave to hit 0V before turning the power on. This prevents massive current spikes (inrush) and extends the life of the relay and the load. 3. **Power Thyristors (Output Stage):** * Usually contains two **SCRs (Silicon Controlled Rectifiers)** connected in anti-parallel. These handle the high current (95A) switching without moving parts, meaning no sparks or mechanical wear. 4. **Snubber Network:** * A built-in RC (Resistor-Capacitor) circuit that protects the semiconductors from voltage spikes ($dv/dt$) caused by inductive loads like motors or transformers. --- ### 3. Application Use Cases Due to its high amperage rating (95A), the G-95-R is used in demanding environments: * **Industrial Heating:** Controlling large electric furnaces or plastic extrusion heaters. * **Motor Control:** Soft-starting or switching heavy industrial pumps and fans. * **Lighting Arrays:** Managing large-scale stadium or theater lighting systems where silent switching is required. --- ### 4. Thermal Management Note Because this is a solid-state device, the internal semiconductors generate heat proportional to the current. * **Heat Sink Requirement:** At 95A, the G-95-R **must** be mounted on an appropriately sized aluminum heat sink with thermal paste. * **Derating:** Without active cooling, the maximum current capacity drops significantly as the ambient temperature rises.