Solid State Relay Controllers

Model	Phases	Firing Mode	Output	Current Low	Current High	Highlights
1020	Single Phase	Zero Cross	AC	10	70	Powered off of the 4/20mA loop, so no control transformer is required.
1021A	Single Phase	Zero Cross	AC	10	70	Accepts most commands.
1021B	Single Phase	Zero Cross	AC	10	70	Accepts most commands. Sync-guard smoothes out line current draw when multiple controllers are in use.
1022	Single Phase	Phase Angle	AC	10	70	Accepts Vdc and potentiometer commands.
1025	Single Phase	Phase Angle	AC	10	70	Accepts mA commands.
1032A	Single Phase	Phase Angle	AC	10	70	Accepts most commands. Field adjustable current limiting.
1600	Single or Three Phase	Phase Angle or Zero Cross	AC	10	70	Multi-zone. Accepts most commands. Allows mixing of line voltages and load currents for multiple zones in a small footprint.
1802/1805	Single Phase	Phase Angle	DC	10	40	60Hz halfwave DC output. 1802 accepts Vdc or potentiometer commands, 1805 accepts mA commands.
1822	Single Phase	Phase Angle	DC	10	30	Accepts Vdc or potentiometer commands. 120Hz fullwave DC output.
1825	Single Phase	Phase Angle	DC	10	30	Accepts mA commands. 120Hz fullwave DC output.
2022	Single Phase	Phase Angle	AC	10	70	Accepts most commands. Dual setpoints for fast transitions.
3020	Three Phase	Zero Cross	AC	10	70	Powered off of the 4/20mA loop, so no control transformer is required.
3021A	Three Phase	Zero Cross	AC	10	70	Accepts most commands.
3021B	Three Phase	Zero Cross	AC	10	70	Accepts most commands. Sync-guard smoothes out line current draw when multiple controllers are in use.

Learn more about firing modes here.

Learn more about load connections here.