Hard-wired to the circuit breaker or main disconnect, the UPA
flashes whenever voltage is present. Engineered with redundant
circuitry, the Power Alert is powered by the same volatage it indicates.
The eight detector UPA-130 visually alerts to the presence of
dangerous AC or DC (Store Energy) potentials occurring between
any combination of the four monitored input lines (L1, L2, L3,
Two LED indicators are assigned to each input line and are designated
"+" and "-". For each input line carrying an AC potential
(bi-polar) both the "+" and "-" LEDs will be active. A DC or Stored
Energy potential will illuminate the "+" LED for the positive line
and the "-" LED for the negative line.