Model 4A (220 to 240V) controller is similar to above, except it has a 3 ft, 3-wire power cord. User must supply plug meeting local electrical requirements.
Used to control THERMOWELL heating mantles or other resistive heating circuits (hot plates, heat tapes, water baths, etc.). Available in solid-state or proportional on/off models. All models are fused (without circuit breakers). Each unit is calibrated to deliver a known amount of power or voltage at a given dial setting in the 15 to 70% range (off below 15% and full on above 70%). High capacity with constant power output despite large line voltage fluctuations. Does not vary voltage. 50/60 Hz.
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