The Model UPA-130 Power Alert reduces the risk of electrical arc flash by pre-verifying the electrical isolation from the outside of a control panel. The Universal Power Alert is hardwired to the circuit breaker or main disconnect and has an LED indication whenever voltage is present. It is engineered with redundant circuitry, which allows it to be powered by the same voltage that it indicates. The eight detector UPA-130 visually alerts to the presence of any dangerous AC or DC (stored energy) potentials occurring between any combination of the four input lines (L1, L2, L3, GND). The UPA-130 Universal Power Alert is designed to fit a 30mm knockout.