R820 SCR Power Controllers
Viconics’ R820 SCR power controller has been designed for safe and reliable control of electric heat loads. By offering a competitive price, the use of SCR’s is no longer an expensive proposition as was the case just a few years ago. As a result, this broad line of products is used by most major North American duct heater manufacturers. Input signal can be provided by DDC panel or Viconics’ own VT7225 thermostat.
Features
- High efficiency, anodized heat sink improves heat dissipation
- Available from 48 to 600 Volts A.C., 25 to 75 Amps; single or three phase (two leg)
- Zero-cross firing minimizes interference to other loads
- LED to indicate proper operation
- Multi-input control signal (0-10 V d.c.; 4-20 ma d.c.)
- Quick connect, slave terminal to connect to R810 power switches
- UL and CSA approved
Model Selection
| Model | Maximum Voltage | Amperage | Phase |
| R820-621 | 600 | 25 | 1 |
| R820-623 | 600 | 25 | 3 |
| R820-641 | 600 | 45 | 1 |
| R820-643 | 600 | 45 | 3 |
| R820-671 | 600 | 75 | 1 |
Documentation
Product Documents
| R820 Technical Bulletin |  |