The R series controllers are available in three configurations.
R1 - single phase control
R2 - three phase two legs controlled, comprised of (1) R1 and (1) R slave.
R3 - three phase three legs controlled, comprised of (1) R1 and (2) R slaves.

The R1 is a proportional, zero voltage switched power controller capable of delivering 1-98% of the applied line voltage to the directly connected electric heaters. This is accomplished by varying the percentage of AC voltage cycles conducted by an SSR. The R series will not control transformers or motors.
Unit of Measure


Manual Control

N/A Use Avatar MTP Isolated Potentiometer.

Input Signal

N/A 4-32 VDC

Supply Voltage

N/A 48 to 480 VAC 50/60 Hz




N/A 1

Legs Controlled

N/A 1

Response Time

N/A ‹ 10 ms

Operating Temperature (Ambient)

N/A 50 °C (10 to 25 amps)

Control Method

N/A Zero Voltage Switched, Proportional

Output Voltage

N/A 1 to 98% of supply voltage

Electrical Connections

N/A Check the Avatar serial tag and verify the correct voltage/ ampere ratings and input control signal for your application. Wiring must be performed in accordance with any and all applicable local and national codes. Use a minimum wire size of 16 AWG for a 10 amp R, 14 AWG for a 15 amp R, and a minimum of 10 AWG for a 25 amp R. For best results keep control signal and power wires separated.


N/A All Avatar Instruments products carry a full three year, from date of purchase, parts and labor warranty against component failure and defects in workmanship. In the event your controller fails to perform properly, contact Avatar to obtain a return authorization number. Controllers sent to Avatar for warranty service that have no apparent defect will be treated as a standard repair and a $50.00 charge will be applied. Avatar will repair or replace any unit that failed due to defective parts or assembly. This warranty DOES NOT cover damage due to shipping, abuse, misapplication or operation beyond specified rating. Further more fuses and improperly fused SCR's are NOT COVERED by this warranty. Avatar is not responsible for any subsequent or other damage experienced in use of this device.



N/A The R1 is a solid state relay that takes a 4-32 VDC input signal from a front-end controller and switches the heater load on/off. The R1 is a POWER CONTROLLER, it CANNOT create more voltage or current. There is no "tuning" or "tuning adjustments". TROUBLESHOOTING TIP: phase angle fired controllers are recommended for very fast processes and low mass heaters. Overall process control results are set by the dynamic characteristics of the heaters, transfer medium, sensor, and the tuning of the front-end controller, not the power controller.