This is a guide on the different types of elevator interlocks/gate switches.
GAL[]
Interlocks[]
- SDM (double swing doors on manual elevator)
- M (manual hoistway door)
- MO (side opening automatic doors)
- MOCP (center opening automatic doors)
GAL door interlock.
GAL MO interlock
GAL interlock type MOCP, used on a 1990s Indolift elevator in Bandung, Indonesia.
Gate switches[]
- G
- CSM (likely a gate switch, but unconfirmed)
- SDC (likely a gate switch, but unconfirmed)
LG Elevators[]
LG elevator door interlock (installed in 1995).
Another LG door interlock. Notice the long spring (automatic close device) on the doorway.
Mitsubishi[]
1990s Mitsubishi elevator door interlock (bottom).
Otis[]
- Type L (swing door interlock)
- 6940A (automatic door interlock)
- 1021A (automatic door interlock, unsure if found in United States)
Otis external door interlock (on the upper side of the picture) and internal door interlock (on the lower side of the picture). These interlocks are both mechanical and electrical protected.
1920s Otis electromagnetic door interlock in Guggenheimer Nursing Home.
Otis 10212A door interlock, used in a 1990s Otis elevator in Bali, Indonesia (elevator no longer exist).
Otis 10212A door interlock, used in a Gen2 Premier elevator in Bandung, Indonesia.
Otis 6940A interlock.
Vintage Otis Type L interlock.
Vintage Otis Type L interlock contacts.
Vintage Otis door interlock, unknown series.
Older Otis door interlock (115 volts .AC)
Toshiba[]
1990s Toshiba elevator door interlock.
Unknown[]
Third-party? swing door interlock on a 1960s Hammond & Champness (modernized by Stannah) elevator.