| Our high quality SCR Power Controls are designed to operate reliably for many years in process environments. We provide zero- and phase-fired, single-phase and three-phase controls from 15 to 1200 amperes for all standard voltages. HDR offers the broadest selection of standard controls with UL, CSA, cUL and CE Approvals. We also offer many custom designs and options. Typical applications include: kilns and ovens, environmental chambers, extruders, molding equipment, autoclaves, furnaces and dryers.