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RKC Instruments' THV compact, microprocessor-based SCR power controllers are available in a full line of amperages. Designed to provide high performance at a lower cost, the controllers are offered in 20, 30, 45, 80 and 100 amperes. The units feature programming keys and a digital display on the front, respond to input changes in fast-response applications and offer programmable phase control or zero-cross control. Set values and input signals can be checked and monitored via the front digital display keys, but can also be made with an external setting unit like a variable resistor.