Dehn 900787 Surge protective devices for circuit breakers 4-pole C40 A

Pre-wired complete unit, additional wiring of the single devices not necessary. Meets the requirements of EN 50550 "Power frequency overvoltage protective device". High reliability due to "Thermo Dynamic Control" SPD monitoring device. For protecting low-voltage consumer's installations against transient and temporary overvoltages (SPD+POP). For installation in conformity with the lightning protection zone concept at the boundaries from 0B-1 and higher.