What does PB stand for in control switching terminology?

In control switching terminology, PB stands for Push Button. This term is commonly used to describe a type of input device that activates or deactivates a circuit or control function when pressed. Push buttons can be found in various applications, from simple light switches to complex control systems in industrial settings. Their function is crucial because they provide a user-friendly interface by allowing operators to initiate actions, such as starting motors, activating alarms, or toggling equipment states.

The other terms, while they may have their own meanings in specific contexts, do not align with the standard terminology used in control switching. Power Block and Protective Box are not commonly associated with the term PB in control applications. Pneumatic Breaker refers to a device used in air system controls rather than electrical switching terminology. Thus, Push Button is the correct and widely accepted interpretation of PB in this field.