• Prevents a defective LTC tapchanger control from running the voltage

outside the upper or lower limits

• Prevents the line drop compensator from raising the voltage too high

under full or overload conditions

• Fully transient protected and operates within ±1% voltage accuracy

over a temperature range of -40° to +80° C

• Includes First Customer Protection

Features

Block Raise and Block Lower voltage levels are set by accurately calibrated

Bandcenter and BANDWIDTH controls, similar to those found on LTC transformer

controls.

BLOCK RAISE/LOWER and LOWER LEDs indicate backup control status.

Block Raise, Block Lower, Lower and Alarm contacts provide outputs to drive

external components.