Electric Switch Lock Cylinders: Momentary vs Maintained Contact Key Switches
Engineering Overview: Technical analysis of key-operated electrical switch cylinders for access control systems, motorized gates, and elevator overrides.
Technical & Engineering Specifications
| Application | Elevators, Automatic Gates, Industrial Alarms |
|---|---|
| Switch Types | Momentary (Spring-Return) or Maintained (Latching) |
| Cylinder Type | Tubular Pin or Euro Profile Half Core |
| Key Positions | 2-Position or 3-Position Center-Off |
| Electrical Rating | 250V AC / 5A (SPDT / DPDT Microswitches) |
Electro-Mechanical Interfacing
Electric Switch Lock Cylinders convert mechanical key rotation into electrical switching signals, serving as high-security bypass triggers for automated gates, security shutters, and elevator keypads.
Contact Modes
- Momentary Contact (Spring-Return): Turning the key closes the circuit temporarily; releasing the key springs it back to center (used for gate pulse triggers).
- Maintained Contact (On/Off): Key can be removed in both ON and OFF positions, keeping the circuit closed indefinitely (used for alarm arming).
Microswitch Integration
Houses industrial SPDT/DPDT microswitches rated at 250V AC / 5A behind a heavy cast brass housing.
Frequently Asked Engineering & Selection Questions
Q1: What is the difference between momentary and maintained key switches?
Momentary switches spring back to center when released, while maintained switches lock into position and can hold the circuit closed.