Siemens 6DR5020-0NG00-0AA0 Intelligent electropneumatic position controller; For linear and rotary pneumatic actuators; With 2-wire connection; 4…20mA; Double-acting; Polycarbonate enclosure Standard Without explosion protection. Cable entry: M20 x 1.5 thread. Pneumatic connection: G1/4 thread. Without limit monitor. Without option module. . Short instructions English / German / Chinese. Standard / Fail-Safe – Bleed the actuator in the event of a power failure (single-acting)