What Switches and Sensors Are Used in Escalators?
In an automatic escalator system, safety is always the core of both design and operation.To ensure stable and reliable performance, various switches and sensors are installed at different positions to monitor the operating status of the escalator in real time and prevent faults or accidents.So, what switches and sensors are commonly used in escalators, and what are their functions?
Today, the technical team from A-FLY Escalator & Elevator Parts Supplier will explain them in detail.
1. Step Switch / Step Gap Switch
The escalator step switch detects whether the steps are maintaining the correct spacing.If a step becomes loose, misaligned, or an abnormal gap appears, the switch triggers an immediate alarm and stops the escalator.
Function: Prevents step disengagement and “step collapse” accidents — one of the most fundamental safety protections.
2. Comb Plate Switch
Located at the entrance and exit, the escalator comb plate switch is activated when an object becomes trapped or excessive pressure is applied around the comb area.Once triggered, the escalator stops immediately.
Function: Prevents entrapment accidents, protecting passengers' shoes, clothing, and feet.
3. Handrail Speed Sensor
The handrail must move at the same speed as the steps.If the handrail slips or runs at an inconsistent speed, the sensor detects the abnormality and stops the escalator.
Function: Prevents loss of balance or falls caused by speed mismatch.
4. Step Chain Breakage Switch
The step chain carries the entire step system and is one of the most critical load-bearing components.This switch monitors the chain tension and condition. If slack or breakage is detected, the escalator immediately applies the brake.
Function: Prevents catastrophic accidents caused by chain failure.
5. Direction Switch
Used to detect the current running direction (up or down).During maintenance or direction changes, the switch ensures the control system correctly identifies the movement direction.
Function: Prevents incorrect starting or unintended direction reversal.
6. Brake Switch
The brake switch checks whether the brake system is properly released or engaged.If the brake cannot open or close normally, the system stops the escalator.
Function: Ensures emergency braking works at critical moments, preventing overspeed or uncontrolled sliding.
7. Drive Chain Safety Switch
Monitors the condition of the drive chain, including slack, wear, or breakage.If abnormalities occur, the switch cuts off power immediately.
Function: Prevents drive system failures that may cause sudden stops or jamming.
8. Access Cover Safety Switch
Installed under covers such as the motor cover, control cabinet, and drive unit covers.When a cover is opened during maintenance, the safety switch prevents the escalator from starting.
Function: Protects maintenance personnel from accidental startup.
9. Emergency Stop Button
Located near the escalator entrance and exit.Passengers or staff can press the button to stop the escalator in an emergency.
Function: Provides fast, direct human intervention in dangerous situations.
10. Speed Monitoring Switch (Fast/Slow Speed Switch)
This switch checks whether the escalator’s operating speed is within the designated range.If the escalator speeds up or slows down abnormally, it triggers an immediate shutdown.
Function: Prevents overspeed conditions and shock hazards.
11. Water Level Switch
Installed in the pit or at the bottom of the equipment to detect water accumulation.If water levels become too high, the escalator stops.
Function: Prevents electrical short circuits and motor flooding.
12. Main Power Switch
Controls the entire escalator power supply.Before maintenance, technicians must turn it off to ensure complete power isolation.
Function: Eliminates the risk of electric shock during servicing.
13. Safety Switches (Multiple Points)
Several safety switches form an integrated safety circuit across key locations.If any part detects an abnormality, the safety circuit cuts off immediately.
Function: Ensures the entire system stays in a safe state at all times.
14. Skirt Panel Safety Switch
Detects unsafe proximity to the escalator’s side panels.If excessive pressure or abnormal contact occurs, the escalator stops instantly.
Function: Prevents legs, clothing, or bags from being drawn into the side panel.
A-FLY — Your Trusted Supplier of Escalator Safety Switches and Sensors
As a global professional escalator parts supplier, A-FLY provides a full range of safety switches and sensors, including:
Handrail Speed Sensor
Step Chain Tension Switch
Drive Chain Safety Switch
Direction Switch, Limit Switch, Emergency Stop Button
Escalator Main Control Board & Drive System Components
All A-FLY products undergo strict testing and are compatible with major escalator brands.
Our switches and sensors feature:
High stability, long lifespan, strong anti-interference, and excellent installation compatibility for malls, metro stations, airports, hotels, and public buildings.
Conclusion: Every Switch Plays a Critical Role in Safety
Every switch and sensor on an escalator is a vital guardian of passenger safety.They ensure stable operation during normal use and stop the escalator instantly when abnormalities occur—minimizing risks.
Choose A-FLY to make your escalator safer, smarter, and more reliable.A-FLY — Delivering professional escalator safety solutions worldwide.
