PBA - 

4 Wire AC Power Block, 105 to 130 VAC @ 50/60 Hz Input Voltage

Banner MULTI-BEAM® sensors are compact modular self contained photoelectric switches. Each MULT-BEAM® solution consists of 3 components — Scanner Block, Power Block, and Logic Module.

The Scanner Block contains the complete modulated photoelectric amplifier as well as the emitter and receiver optoelements. It also contains the sensing optics and the housing for the other two modules. The Power Block provides the interface between the scanner and the external circuit. It contains a power supply for the MULTI-BEAM® plus a switching device to interface the circuit to the controller. The Logic Module (not required for opposed mode emitters) interconnects the power block and scanner block both electrically and mechanically. It provides the desired timing logic function (if any), plus the ability to program the output for either light or dark response.

Create a Photoelectric Based on Your Application Requirements
Step 1: Choose a Sensor Block for the Required Sensing Mode
Step 2: Choose a Power Block for the Required Sensor Power (AC or DC) and Output
Step 3: Choose a Logic Module (Not Required for Opposed Mode Emitters)
Step 4: Plug in the Power and Logic Components into the Sensor Block
Step 5: Select Additional Options (Fiber Optic Cables, Mounting Brackets) as Needed
MULTI-BEAM power blocks provide AC and regulated low voltage DC to scanner blocks and logic modules. Connections are made to heavy-duty screw terminals which accept up to #14 gauge wire (no lugs necessary). All power blocks are epoxy-encapsulated and rated for -40°C to 70°C. Response times are determined by the scanner block used, except that power block switching AC requires up to 8.3 milliseconds to turn OFF in addition to the response time of the scanner block (plus logic module time delay, if any).
The power block provides the interface between the scanner block and the external circuit. It contains a power supply for the Multi-beam plus a switching device to interface the circuit to be controlled.