DIN 41098-2
DIN 41098-2 Switch box for electric sirens for voltages up to 380 V<Wechselstrom>, technical terms of delivery
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 09/01/1969
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 09/01/1969