## Electronic Specifications of the RGC3 Series (25A Models) The **RGC3..25** refers to a 3-phase, 2-pole or 3-pole Solid State Contactor (SSC) manufactured by Carlo Gavazzi. Specifically, the "25" indicates a rated operational current of **25 Amperes AC per pole**. Below is a detailed breakdown of the electronic components and technical specifications. --- ### 1. General Electrical Ratings These units are designed to replace traditional electromechanical contactors, offering silent operation and high switching frequency. | Feature | Specification (25A Model) | | :--- | :--- | | **Rated Current ($I_e$)** | 25 AAC per pole (@ 40°C) | | **Number of Poles** | 2-pole (RGC3A22) or 3-pole (RGC3A60) | | **Rated Voltage ($U_e$)** | Up to 600 VAC (depending on model) | | **Switching Type** | Zero Cross (ZC) - turns on when voltage crosses zero | | **Operational Frequency** | 45 to 65 Hz | --- ### 2. Control (Input) Specifications The control circuit is the "trigger" that tells the device to conduct. There are two primary variants: * **DC Control:** Typically 5-32 VDC. * **AC Control:** Typically 20-275 VAC / 24-190 VDC. | Parameter | DC Variant | AC Variant | | :--- | :--- | :--- | | **Pick-up Voltage** | 5.0 VDC | 20 VAC/DC | | **Drop-out Voltage** | 1.0 VDC | 5 VAC/DC | | **Maximum Input Current** | 25 mA | 20 mA | | **Response Time (Pick-up)** | 0.5 cycle + 500μs | 2 cycles | --- ### 3. Output (Power) Specifications The output utilizes back-to-back thyristors (SCRs) to handle the power load. * **Blocking Voltage:** 1200 Vp for models rated up to 600 VAC. * **$I^2t$ for Fusing:** 525 $A^2s$ (This is a critical value for choosing the correct high-speed semiconductor fuse to protect the internal SCRs). * **Leakage Current:** < 5 mArms at rated voltage. * **Critical dV/dt:** 1000 V/μs. --- ### 4. Safety and Protection Features The RGC3 series is engineered with several electronic safeguards: 1. **Integrated Over-temperature Protection:** Optional models include a thermal sensor that shuts down the output if the heatsink exceeds safe temperatures. 2. **Varistor Protection:** Integrated Transient Voltage Suppressors (TVS) protect the output against voltage spikes from the mains. 3. **LED Status Indicator:** A front-face LED (usually green) indicates the status of the control input. 4. **IP20 Protection:** Touch-safe terminals to prevent accidental contact with live electronic parts. --- ### 5. Wiring Diagram Logic ```mermaid graph LR A[Control Input +] --> B[Internal Opto-Isolator] B --> C[Zero-Cross Trigger Circuit] C --> D[Thyristor Gate L1] C --> E[Thyristor Gate L2] C --> F[Thyristor Gate L3] ``` ---