Schneider Electric R820-643 SCR Power Controller - 600V 45A 3-Phase

The Schneider Electric R820-643 is a Silicon Controlled Rectifier (SCR) power controller designed for cost-effective, precise modulation of electric loads in commercial and industrial heating applications. This 3-phase controller operates at voltages up to 600 VAC with a current rating of 45 amps, making it ideal for controlling modulating electric duct heaters and resistive heating loads.

Key Features:

• 600 VAC maximum voltage, 45 amp current rating, 3-phase configuration
• Zero-crossing SCR control for precise load modulation
• Factory-assembled multi-fin anodized heatsink with high heat dissipation rate
• Compatible with multiple control signals: 0-10 VDC, 4-20 mA, and 0-135 ohms
• DIP switch configurable for easy field adjustment
• Integrated over-temperature thermostatic protection (self-resetting at 82°C/180°F)
• Pulse status LED for servicing and troubleshooting
• Suitable for surface mounting or in-panel installation
• Microcomputer-based control for reliable operation
• Operating temperature range: 32°F to 176°F (0°C to 80°C)
• CSA approved for Canada and USA, UL recognized

Part of the Viconics R820 REV2 series, this power controller provides cost-effective switching solutions for integration with building automation systems, analog room thermostats, and supply air control applications. Applicable for resistive loads only. All external safety devices such as contactors, relays, flow switches, and thermal protections must be supplied and installed separately.