Power switch For the power reduction of high-pressure sodium vapour lamps (HS) and mercury vapour lamps (HM) using ballasts with tapping and superimposed igniters Mains voltage: 230V, mains frequency: 50Hz max. permissible housing temperature: 80°C Screw terminals: 0.75-2.5qmm Fastening: threaded bolt with pre-assembled toothed washer and nut For luminaires of protection class I and II Type PU 121 K For guaranteed full load start-up of the lamp With integrated switching delay: 327 sec. Power reduction by switching on the control phase Self-heating: