The Model V-2980 single-phase isolation unit allows surge
testing of devices or equipment connected to active single-phase
power lines up to 277V RIM and 25A (30A intermittent) . The
isolation unit will protect the power line from undesirable back
surges without loading the surge generator output and will
attenuate the AC voltage being fed back into the generator . The
Model V-2980 is used in conjunction with the Velonex Models 587,
588 or 590 Voltage and Current Surge Generators to form a
complete surge testing system .