Which of the following is NOT a key switch found in the MCB Panel?

The question asks to identify which switch is not a key switch typically found in a Motor Control Center (MCB) Panel. The emergency stop switch is a critical safety feature found in many industrial and control systems, including MCB panels. This switch is designed to immediately halt operations in the event of an emergency, thereby ensuring the safety of personnel and equipment.

In contrast, options like the door loop bypass, safety loop bypass, and trip cock bypass are more specialized and may not typically be categorized as key switches. Key switches are designed to enhance security and control access to specific functions in the panel, allowing only authorized personnel to operate or configure equipment. The emergency stop switch, however, serves a broader safety function and is more commonly found on all operational panels to ensure immediate accessibility in emergencies.