What device is responsible for cutting power to elevator motors when activated?

The shunt-trip device is critical in ensuring safety in elevator systems. When activated, a shunt-trip device disconnects power to the elevator motors, effectively halting their operation. This feature is often used in emergency situations, such as during a fire, to prevent elevators from operating when they may pose a risk to safety. By cutting power to the elevator motors, the shunt-trip ensures that the elevators do not inadvertently operate, potentially putting trapped passengers or responders at risk.

In contrast, other devices like power relays manage electrical circuits but may not have the specific function of disconnecting power in emergency scenarios. Emergency cut-off switches can serve similar purposes but are typically more general without the specific focus on elevator systems. Switch controls may allow for manual operation but do not automatically cut power in emergency contexts like the shunt-trip does. Thus, the shunt-trip is specifically designed to enhance safety and respond effectively in critical situations.