https://www.fujischelevator.com/products/elevator-machine-room-speed-limiter.html An elevator speed limiter is a safety device that is installed in the machine room of an elevator. It is designed to regulate the maximum speed of the elevator by controlling the speed of the elevator motor. The device works by utilizing a safety governor, which measures the speed of the elevator and prevents it from exceeding a preset limit. If the elevator exceeds the maximum limit, the speed limiter will activate the emergency brake, stopping the elevator and preventing any potential accidents or injuries. The Elevator Machine Room Speed Limiter is an essential component of elevator safety systems and is required by safety codes and regulations in many regions.