Muller Operating Hours Counter DIN Rail Mount – Muller BW7018, The Muller BW 7018 Operating Hours Counter is suitable for installation in DIN Rail and uses a 230V DC power supply. The 5-digit, 7-segment counter on the front panel is easy to read. The counter is easy to install and has screw terminals and touch proof connections. The slim-fit flush mount counter measures 85 x 17.5mm. Muller BW7018 Operating Hours Counter DIN Rail Mount 45×17.5mm 230VAC