Constant Resistance

Nickel Chronium, Iron Chronium

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Controllers recommended for constant resistance loads are listed below:

Model Phase Mode Voltage Current Highlights
1020 One Zero Cross 120-575 Vac 10-70 Amps Powered off of the 4/20mA loop, so no control transformer is required.
1021A One Zero Cross 120-575 Vac 10-70 Amps Accepts most commands.
1021B One Zero Cross 120-575 Vac 10-70 Amps Accepts most commands. Sync-guard smoothes out line current draw when multiple controllers are in use.
1022 One Phase Angle 120-575 Vac 10-70 Amps Accepts Vdc and potentiometer commands.
1025 One Phase Angle 120-575 Vac 10-70 Amps Accepts mA commands.
1027A One Zero Cross 120-575 Vac 50-160 Amps Accepts most commands. Features include: Sync-guard and Trans-guard.
1029D One Phase Angle 120-575 Vac 50-2000 Amps Higher current ratings than our solid state relay models. Features include: current limitingshorted SCR detectionover-current trip, metering outputs, user selectable feedback modes.
1032A One Phase Angle 120-575 Vac 10-70 Amps Accepts most commands. Field adjustable current limiting.
1600 One/Three Phase Angle or Zero Cross 120-575 Vac 10-70 Amps Accepts most commands. Allows mixing of line voltages and load currents for multiple zones in a small footprint.
2022 One Phase Angle 120-575 Vac 10-70 Amps Accepts most commands. Dual setpoints for fast transistions.
3020 Three Zero Cross 120-575 Vac 10-70 Amps Powered off of the 4/20mA loop, so no control transformer is required.
3021A Three Zero Cross 120-575 Vac 10-70 Amps Accepts most commands.
3021B Three Zero Cross 120-575 Vac 10-70 Amps Accepts most commands. Sync-guard smoothes out line current draw when multiple controllers are in use.
3027 Three Zero Cross 120-575 Vac 85-750 Amps Accepts most commands. Features include: Sync-guardTrans-guard and on-board line fusing for most frame sizes.
3037 Three Zero Cross 120-575 Vac 85-750 Amps Accepts most commands. Features include: Sync-guardTrans-guard, Shorted SCR detection and on-board line fusing for most frame sizes.
3321A Three Zero Cross 120-575 Vac 10-70 Amps Accepts most commands.
3337 Three Zero Cross 208-575 Vac 200-750 Amps Accepts most commands. Features include: Sync-guardTrans-guardShorted SCR detection and on-board line fusing for most frame sizes.
3629C Three Phase Angle 208-575 Vac 50-1000 Amps Higher current ratings than our solid state relay models. Features include: current limitingshorted SCR detectionover-current trip.
FUSION Single Phase AC One Phase Angle or Zero Cross, Zero Cross Transformer Mode 24-600 Vac, 45-65 Hz
(Auto-Ranging)
50 - 1200 Amps 24 - 600 Vac. A microprocessor-based SCR controller operating both analog and digital interfaces. A phase angle or zero cross fired controller which linearly controls, with respect to the setpoint, the AC voltage, current, or true power applied to an electrical load. Control is achieved by means of a pair of inverse parallel SCRs.
FUSION Single Phase DC One Phase Angle or Zero Cross, Zero Cross Transformer Mode 24-600 Vac, 45-65 Hz
(Auto-Ranging)
45 - 1080 Amps 24 - 600 Vac. A microprocessor-based DC SCR controller operating both analog and digital interfaces. A phase angle fired controller which linearly controls, with respect to the setpoint, the DC voltage, current, or true power applied to an electrical load. Control is achieved by means of a half controlled SCR bridge
FUSION Three Phase AC  Three Phase Angle or Zero Cross, Zero Cross Transformer Mode 24 - 600 Vac, 45 - 65 Hz
(Auto-Ranging)
50 - 1200 Amps 24 - 600 Vac. A microprocessor-based SCR controller operating both analog and digital interfaces. A phase angle or zero cross fired SCR controller which linearly controls, with respect to the setpoint, the AC voltage, current, or true power applied to a three phase electrical load. The 3 phase controller can be ordered in either 2 or 3 leg control with 2 leg being limited to zero cross firing. Control is achieved for 3 leg by three pairs of inverse parallel SCRs or in 2 leg by 2 pairs of inverse parallel SCRs.
FUSION Three Phase DC Three Phase Angle or Zero Cross, Zero Cross Transformer Mode 24 - 600 Vac, 45 - 65 Hz
(Auto-Ranging)
60 - 1400 Amps Full Wave Rectified 24 - 600 Vac. A microprocessor-based DC SCR controller operating both analog and digital interfaces. A phase angle-fired controller which linearly controls, with respect to the setpoint, the DC voltage, current, or true power applied to an electrical load. Control is achieved by means of a six SCR bridge with freewheeling diode.
Compact FUSION Single Phase One Phase Angle, Zero Cross, Burst, Zero Cross Transformer Mode 24-600 Vac, 45-65 Hz
(Auto-Ranging)
10 - 160 Amps 24 - 600 Vac. A microprocessor-based SCR controller, operating with both analog and digital interfaces. Output is controlled linearly with respect to command signal and can be set to the average or RMS value of the voltage or current, as well as true instantaneous power or external feedback.
Compact FUSION Three Phase Three Phase Angle, Zero Cross, Burst, Zero Cross Transformer Mode 24-600 Vac, 45-65 Hz
(Auto-Ranging)
10 - 160 Amps 24 - 600 Vac. A microprocessor-based SCR controller operating both analog and digital interfaces. Can be ordered in either 2 or 3 leg control with 2 leg being limited to zero cross firing. Output is controlled linearly with respect to command signal and can be set to the average or RMS value of the voltage or current, as well as true instantaneous power or external feedback.
MicroFUSION Single Phase One Phase angle, Zero cross, Zero Cross Transformer Mode 24-600 Vac, 45-65 Hz
(Auto-Ranging)
8 - 400 Amps MicroFUSION is an ultra-compact high performance digital SCR controller that adapts to the analog environment as well as the digital environment.
MicroFUSION Three Phase Three Phase angle, Zero cross, Zero Cross Transformer Mode 24-600 Vac, 45-65 Hz
(Auto-Ranging)
8 - 400 Amps MicroFUSION is an ultra-compact high performance digital SCR controller that adapts to the analog environment as well as the digital environment.

Learn more about firing modes here.

Learn more about load connections here.