Overvoltage protector type 1 24 VAC/DC 4-pole, BXT ML4 BD HF 24, Dehn
Overvoltage protector type 1 180 VAC/DC 4-pole, BXT ML4 BD 180, Dehn
Overvoltage protector type 1 5 VAC/DC 4-pole, BXT ML4 BD HF 5, Dehn