To provide secure locking of swinging passage / control doors using third party security management systems (SMS) or conventional key control. Designed to enable key and electric operation from both sides of the door. This lock is specifically designed for very high use applications; typically securing perimeter doors, main access routes and vehicle gates.


The 3R66 is a mortice lock of robust construction based on the Chubb Locks Custodial Services large mortice footprint. The main bolt is operated using a handle to engages / withdraw.

Electrical Mode
Locking/unlocking by 24 Volt DC controlled sequence from an external source (SMS). Bolt withdrawal by handle, which should also be used when engaging the bolt to secure the door.

Manual Mode
Locking/unlocking achieved using conventional (mechanical key). Bolt withdrawal by handle, which should also be used when engaging the bolt to secure the door.

Manual Override
In the event of power or communication failure an override key is used to disable electric locking function.


Solid Case Technology; Lock case machined from single piece carbon steel block.

Steel main anchor bolt, with carbide anti cut rollers.

Unique dual solenoid electric locking latch.

Independent 8-lever locking mechanism.

Lock provides status monitoring of critical functions and tamper.

Integral baffle arrangements to resist manipulation and interference via the keyhole.

Dedicated key profile operates 3R63/3R66/3M63/Atlas group of locks only.


Mechanical locking mechanism tested to a minimum of 300,000 operations.

Handle mechanism tested to a minimum of 500,000 bolt operations

Solenoid locking unit tested to a minimum of 1,000,000 cycles.

Solenoid arrangement designed to operate at +/-10% of 24V DC regulated supply.

Nominal operating current 500mA.

End load 13.5 KN

Side Load 13.5 KN

Additional Features

Supplied with “T” Handle as standard.

Range of fixings including reinforcing plates and locking plates.

Gate boxes for steel door applications recommended.

Interchangeable mechanical inner locking unit to enable re-coding.

This lock is not available under a master key system.

Escutcheon trim plates supplied for wooden door variants as standard.

Materials and Finishes

Lock case - carbon steel electro-plated.

Main bolts - carbon steel electro-plated.

Main bolt follower - high tensile brass.

Keys – hardened steel

Escutcheons – silica brass


Fully dimensioned customer drawings are available on request to assist with door preparation.