Power switch for reducing the power of sodium vapor high-pressure lamps and mercury vapor lamps using ballasts with tapping and overlay ignition devices. Mains voltage: 230 V, mains frequency: 50 Hz. Max. permissible housing temperature: 80 °C. Screw terminals: 0.75-2.5 mm². Mounting: threaded bolt with pre-mounted toothed washer and nut. For luminaires of protection class I and II. Type PU 121 K. Ensures guaranteed full-load start of the lamp. With integrated switching delay: 3.27 seconds. Power reduction by activating the control phase. Self-heating: < 25 K. Housing: PC, 100 g.