Avatar Instruments
16587 Coastal Highway
PO Box 496
Lewes, DE 19958
Phone: 302-703-6865 • Fax: 302-703-6876
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The A1Z (single Phase 1-leg), A3Z (3-phase, 2-leg) and A6Z (3-phase 3-leg) are proportional, zero voltage switched, single phase power controller capable of delivering 0-99% of the applied line voltage to directly connected electric heaters. 100% power factor. Almost zero harmonics. Can control every half cycle of power to heaters. 50/60 Hz. There are four field replaceable items:
  • Printed circuit board
  • Fuses
  • SCR packages
  • MOV's (Metal Oxide Varistors)
A3Z-Family
Unit of Measure
Items A3Z-Family
A3Z-48-30
A3Z-48-30 Series Three Phase 2-Leg SCR Power Controller 		A3Z-Family
A3Z-48-40
A3Z-48-40 Series Three Phase 2-Leg SCR Power Controller 		A3Z-Family
A3Z-48-60
A3Z-48-60 Series Three Phase 2-Leg SCR Power Controller 		A3Z-Family
A3Z-48-80
A3Z-48-80 Series Three Phase 2-Leg SCR Power Controller 		A3Z-Family
A3Z-48-100
A3Z-48-100 Series Three Phase 2-Leg SCR Power Controller
Voltage Designations N/A 120 to 480 VAC 50/60 Hz
Load N/A 30 AMPS N/A 40 AMPS N/A 60 AMPS N/A 80 AMPS N/A 100 AMPS
Output Voltage N/A 0 to 99% of input voltage
Control Signal N/A 4 to 20 mA at 6 volts DC
Input Impedance N/A 300 ohms
Power Dissipation (Watts) N/A 2.4 x maximum current
Cooling N/A Convection: 30-100 amps
Fan (120 VAC): 150-1200 amps
Thermostat N/A 190 ºF (fan cooled units only)
Net Weight N/A 7 Pound N/A 8 Pound N/A 8 Pound N/A 13 Pound N/A 13 Pound
Shipping Weight N/A 9 Pound N/A 11 Pound N/A 11 Pound N/A 14 Pound N/A 14 Pound
Minimum Wire Gauge (Copper Wire Only- 90 ºC Temp Wire) N/A 10 AWG N/A 8 AWG N/A 6 AWG N/A 4 AWG N/A 3 AWG
Wire Lug Torque (90 ºC Temp Wire) N/A 35 lb/in N/A 40 lb/in N/A 45 lb/in N/A 45 lb/in N/A 50 lb/in
Lug Size (90 ºC Temp Wire) N/A 10 AWG N/A 1/0 - 14 N/A 1/0 - 14 N/A 1/0 - 14 N/A 1/0 - 14
R Options N/A -R120 - 120 VAC on-off command signal -R32 - 10 to 32 VDC on-off command signal
Third Leg Fuse Option N/A -3RD
Compact N/A No
Features N/A
  • UL 508 listed, CE pending
  • Compact and light weight
  • 100 % solid state circuitry
  • Over-rated SCR power modules
  • Over-sized heat sink
  • Full power ratings up to 50 ºC (122 ºF) ambient temperature
  • Optically isolated 4-20 mA input standard
  • Variable time base provides high resolution control
  • Electrically isolated chassis and heat sinks to 600 Amps
  • Gold alodined chassis and heat sink
  • I2T fusing and MOV protection on all power SCR's
  • SanRex, SemiKron, International Rectifier and Fairchild semiconductors
  • Double sided FR4 VO-94 rated glass epoxy PCB's
    • Theory of Operation N/A Avatar Instruments variable time base SCR firing. Note how half cycles can be turned on and off providing 0.08 second resolution on 60Hz power lines.
    The standard input signal (4-20 mA) is applied to the blue input terminal block, processed and fed to optical couplers. The output of each optocoupler controls its respective SCR. An I2T fuse connected in series with the input provides over cur