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 175mm muller bw7018 operating hours counter din rail mount 45x175mm 230vac