In this animation we will show how the concrete mixer maintenance door safety switch works. Maintenance gate safety switch working principle is rather common and it is an important element in concrete mixer safety. When concrete mixer is working in a concrete batching plant the maintenance gate is closed. The edge of the maintenance door is pushing on the switch lever and closing the circuit. It is telling the automation system that the gate is closed. If someone unintentionally tries to open the door, , the edge will release the switch that will break the circuit and trigger the emergency stop. Regularly check the operation of the safety switch and use captive keys and padlocks to increase the safety of your personnel.