The avc63-12 and avc125-10 voltage regulators are designed to control the output of a brushless excited synchronous generator. They are designed to be very rugged, are perfect for a variety of applications, and are especially suitable where the generator is installed in a harsh environment. They can accept supplemental control inputs for utility paralleling applications where a varpf control and overunder excitation limiter are used. These regulators are extremely flexible and offer jumper selection provisions for single- or three-phase sensing, 1 or 2x vhz, and can accept 1 or 5 amp cts. The power stage can accept a frequency range of 50-400hz, and the sensing can be configured for 5060 or 400hz.