1. General Function & Purpose

• Safety Interlock Device: Ensures elevator doors remain securely locked while the cab is in motion.

• Prevents Accidental Door Opening: Critical for compliance with elevator safety standards (EN 81, ASME A17.1).

• Electrical Contact Switch: Cuts power or signals the control system if the door is not properly locked.

2. Key Features & Specifications

• Type: Normally Closed (NC) or Normally Open (NO) contact (varies by model).

• Actuation Method:

  • Mechanical (activated by door movement)

  • Magnetic (in some advanced versions)

• Voltage/Current Rating: Typically 24V DC/AC or 110V AC, 2–5A (verify exact specs for your model).

• Durability: Designed for high cycle counts (100,000+ operations).

• Material:

  • Housing: Reinforced plastic or metal (zinc/aluminum alloy).

  • Contacts: Silver-plated for reliable conductivity.

• IP Rating: Usually IP54 or higher (dust and splash resistant).

3. Installation & Compatibility

• Mounting Position: Installed on elevator door tracks, car doors, or landing doors.

• Commonly Used In:

  • Otis, ThyssenKrupp, Mitsubishi, Hyundai, and KONE elevators (compatible with many brands).

  • Passenger & freight elevators.

4. Safety & Certifications

• Compliance: Meets EN 81-20/50, ASME A17.1, and other regional elevator safety codes.

• Fail-Safe Design: Ensures elevator stops if the switch malfunctions.

5. Common Failure Symptoms

• Elevator won’t run (door lock signal missing).

• Intermittent operation (loose wiring or worn contacts).

• Error codes (e.g., "Door Lock Fault" on the control panel).