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Schneider Electric (Viconics) R820-641-REV2 SCR Power Controller 24-347 VAC 45A

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Special Price $570.65 Regular Price $633.42
In stock
SKU
R820-641-REV2
The Schneider Electric (Viconics) R820-641-REV2 Silicon Controlled Rectifier Power Control Module for controlling high current loads in HVAC systems. It is used in electric duct heaters, unit heaters, and reheat coils, and it improves energy efficiency and system responsiveness. It is designed for quiet operation, which results in less damage to mechanical components and has durable performance and longevity of equipment in commercial HVAC applications, and with this module it operates at 24-347VAC and supports up to 45A, and uses advanced SCR technology to precisely and efficiently modulate electric heating elements.
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HVAC Controls & Electrical, Control Boards & Modules
Manufacturer:
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Specifications

  • Type: Power Control Module
  • Technology Type: Silicon Controlled Rectifier
  • Voltage: 24-347VAC
  • Current: 45A
Manufacturer Name: Schneider Electric (Viconics)
Product Number: R820-641-REV2
OEM Part Number: R820-641-REV2
Product Description: Scr Power Cntrl 24-347Vac 45A
Weight:3.79lbs/1719.11g

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Product Questions (2)
Customer Questions
What maintenance is required for the Schneider Electric (Viconics) R820-641-REV2 SCR Power Controller?

Perform routine inspection of wiring terminals and power connections for looseness or corrosion. Clean dust from heat sinks and ensure adequate cooling airflow to prevent overheating. Periodically verify control signal calibration and safety interlocks for stable operation.

What are common issues with the Schneider Electric (Viconics) R820-641-REV2 SCR Power Controller?

  • Overheating due to insufficient cooling or high load.
  • SCR misfiring or partial conduction failure.
  • Loose or corroded power terminals causing intermittent operation.
  • Control signal drift leading to unstable output.
  • Electrical noise affecting triggering accuracy.

Installation Steps

Step 1: Turn off all electrical power and lock out the HVAC or heating circuit before servicing.

Step 2: Mount the controller securely on a metal panel with adequate ventilation for heat dissipation.

Step 3: Connect load wiring to the output terminals and line power to input terminals per wiring diagram.

Step 4: Attach the low-voltage control signal as specified.

Step 5: Check all connections are tight and properly insulated before restoring power.

Step 6: Power up system and test load modulation, checking for stable heating control and no overheating alarms.