SOLID STATE: type varies voltage and can regulate everything mentioned above. Rated at 500 watts (600W intermittent use), 60Hz, with a pilot lamp; its power-level range is 5-90%. There are five models.
ON-OFF (proportional): type does not vary voltage so it can only regulate resistive heat circuits, but it is rated at 1000 watts, 50/60 Hz, (1200W if hard-wired: EB-1, EB-1F.) The silver contacts (double-housed for super safety) cycle rapidly: For example, if the knob is set at 40% power, the contacts are closed 6.0 sec. and open 9.0 sec.; 6/15 = 40% power or "on" time. On-off controls are famous for their ability to compensate for large line voltage changes. The range for an infinite number of power-level settings is 15-70%; full off below 15%, full on above 70%. The range for competitive units is 5-60%. Six models are available, each one having one or two pilot lamps.
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