Which component ensures electrical contacts close for operation?

• A. Chassis Tongue
• B. Wireless Controls
• C. Swivel Seat Check
• D. Mechanical Trip Lever

Answer: (D)

The action of closing the electrical circuit to start and run the escalator is controlled by a mechanical trip lever. This lever physically actuates the main control contacts when all safety conditions are met, allowing power to flow to the drive motor and control system. In other words, it becomes the mechanism that completes the circuit only when the machine is in a safe, ready position. The other options don’t perform this contact-closure role: a chassis tongue is a structural/alignment piece, wireless controls don’t inherently close the required electrical contacts in the control circuit, and a swivel seat check is a safety/functional check unrelated to energizing the drive.