Von Duprin EL Potted Circuit Breaker
The Von Duprin 050534 EL Potted Circuit Breaker measures 5" long by 1-1/4" wide and 7/16" thick including the wires. This piece spikes the current to the solenoid to open the door, then lowers the current to keep the device open. The 050534 has a plug for the two wire input, and a plug for the 3 wire output.