Siemens 66BA6 Amplifying Relay

Siemens 66BA6 Amplifying Relay is a 66-series pneumatic relay that takes a single input signal and reproduces it across six outputs (1:6 amplification). Used in process instrumentation and control loops, it provides multiple, synchronized outputs from one pressure signal, allowing several actuators, controllers, or indicators to be driven from a single transmitter without introducing additional signal conditioning. The 66BA6 offers a tight zero-error specification of ±0.36 psi (2.5 kPa), reflecting Siemens’ emphasis on precise pressure signaling for reliable control in demanding environments. As part of Siemens’ family of amplifying and reducing relays, the 66BA6 is commonly deployed in chemical processing, oil and gas, water treatment, and other industrial installations where distributed pneumatic control is required. The model is designed for compatibility with standard 66-series pneumatic circuits and works within typical industrial pneumatic pressures; consult Siemens’ installation literature for exact porting and mounting details and to confirm compatibility with upstream transducers and downstream devices.