Unit unlocks selected individual doors
from a remote push button. A door
starter then opens the door(s) a few
Doors opened or closed manually
automatically snaplock and deadlock.
In event of emergency or power failure,
gang unlocking is accomplished in a
remote, mechanical release cabinet.
Doors are then opened the remainder
of the way by hand.

SKU: KR-3 Category:


Type KR.3 devices are medium security,
sliding cell door locking devices for use
with doors not exceeding 300 pounds.
KR.3 devices are applicable to any
multiple cell or inmate room door
situation requiring selective, remote,
electrical unlocking and manual
movement of the door either open or

© 2017, Best Brothers Group. All rights reserved.


Folger Adam

Locking System

Upon closure, each door automatically
deadlocks at two concealed points at
the top and bottom rear edge of the
door. Upon opening, each door
automatically deadlocks open at the
front edge of the door. Locking
components are not exposed or subject
to tampering. Components do not
project into the door opening.

© 2017, Best Brothers Group. All rights reserved.


Type KR Series have been in service
since 1962, and has been tested to
500,000 cycles.

© 2017, Best Brothers Group. All rights reserved.

Standard Features

■ Motor voltage – 120 VAC.
■ Plug-type connectors – Simplified
wire harness installation.
■ Individual motor unlocking – Each
door is unlocked by its own motor.

■ Heavy duty construction – KR.3
devices are ruggedly built for a range
of detention environments.
■ Tamper-resistance – All openings in
housings are baffled to resist inmate
■ Selective unlocking – Each door may
be unlocked by an individual control
switch, group-unlocked with an alldoor
switch, or individually released
through a port.
■ Sloped-top housing – Resists hiding
of contraband.
Flat-top housing is provided where
the device must install close to the
■ Fixed hinge cover – Allows
maintenance without lifting heavy
covers off the device.
■ Automatic deadlocking – When fully
closed or open, independent top and
bottom locking points on the rear of
each door automatically deadlock.
■ Indication switch – Monitors the
deadlocked condition of both locking
points and mid-travel.
■ Two point locking mechanical
release cabinet – A three-position
lever handle or crank handle is
Lever provides:
1. Electric operation – Door control
from a remote location.
2. Release ports open – Opening of
individual release ports. Doors to
be individually released at the
door with a removable handle.
Covers are also individually
released from the port.
3. Emergency unlock – Gang
release of all doors in event of
emergency or power failure.
■ Full length wire tray – Simplifies
routing of electrical wire/harnesses.
Runs the full length of the housing.
■ Removable end battens – Simplify
installation of wire harnesses.
■ Locked open feature – Permits doors
to be held open and immovable.

© 2017, Best Brothers Group. All rights reserved.

Optional Features

■ Motor voltage – 24 VDC.
■ Mechanical release column –
A release column containing a
No. 82 Deadlock may be added to
provide local mechanical locking and
unlocking by paracentric prison key.
■ Two-position motor (MC) – Unlocks
the door by an electric switch. Once
unlocked, the mechanism remains in
the unlocked position until electrically
selected to relock. The door may then
be deadlocked in either the open or
closed position.
■ Key switch – An electric key switch
may be added to the above column
for local electric control.
■ Inmate control feature – Release
columns may be equipped with an
inmate push button on the cell side,
and a key cylinder on the outside.
Inmates may exit by pressing the
push button, and reenter using a key.
Feature may be canceled at a remote
console or other control point.
■ Electrical/mechanical control
cabinet – Electrical switches may be
ordered to provide control of each
door in addition to mechanical
function. These switches may be built
into the mechanical release cabinet,
or located remotely as needs dictate.
1. Individual Push Button Unlocking.
2. Group Switch – Provides group
3. Power Cut-off Switch – Cuts
electric current to controls.
Indication lamps may be installed in
conjunction with switches to show
deadlocked closed or open status of
each door. When used, indication is
as follows:
Red – Open or locked open.
Green – Deadlocked closed.
■ Custom graphic consoles – In many
cases, it may be desirable to separate
electric controls from the mechanical
cabinet located near the cells. For
larger installations, or those with
particular needs, custom-built
consoles may be easily provided with
floor plan graphics screened on the
control panel, and an array of
specialized features.
■ Cell line cable – For applications
using a series of locking devices, a
cell line cable may be specified to
interconnect terminal strips in the
mechanical control/release cabinet to
a plug connector at the door
operating unit. Simplifies routing of
wire, and saves installation cost and
■ G90 galvanized finish available.

© 2017, Best Brothers Group. All rights reserved.