BEA's MC-15 is a safety module & lock out relay. The MC-15 is designed to add safety to automatic door operators that are designed without a safety circuit. The MC-15 uses the motor and the presence sensor to determine if the swing path of the automatic door is clear allowing the door to open or close.
If the swing path is not clear and the door is in the open position, the MC-15 will hold the door open as long as the sensor remains in detection. If the door is closed and there is something in the detection zone, the MC-15 will prohibit the activation device from opening the door.