Muller operating hours counterr panel mount 7 digit muller bg4017 the muller bw 4017 dc operating hours counter is suitable for installation in control panels and uses a 12 48v dc power supply the digits on the front panel are large and easy to read the counter is easy to install and quick to mount using the spring clip and the finger safe connections in line with vbg4 muller bg4017 operating hours counter panel mount 45x45mm 7 digit 12 48vdc