The SKRU consists of a keyed interlock, a solenoid, and a DPDT (quick-make, quick-break) auxiliary
switch. The SKRU is designed to permit removal of a key (or keys) in response to an electric signal.
A pushbutton and/or an indicating light are available options. All electrical components are wired out
to a terminal block.
A single key SKRU is designed to have a key “trapped” in its lock until a signal is sent to the solenoid.
When the solenoid is energized the key can be rotated and released. Turning the key operates the
auxiliary switch. The released key can then be utilized in an interlock sequence. By returning and
rotating the key, it once again becomes “trapped” and the auxiliary switch goes back to its original
state.
The SKRU is available 1) unhoused, 2) unhoused with front cover only, or 3) housed in an aluminum
box with two conduit openings. See the examples above. Two key SKRUs are available two ways;
1) with both keys released upon energization of the solenoid or, 2) requiring an initiating key and a
signal to the solenoid to enable release of a previously held key. It is important that the installer
understand the entire interlock system and its intended purpose.
®
KIRK
Solenoid
Key Release Unit (Type SKRU)
PAGE 3
SKRU - Housed
SKRU - Unhoused
SKRU - Unhoused
with front cover only
(Front and Top view)
Instruction Manual for:
Solenoid Key Release Unit and Time Delay Key Release Unit
Housed
Housed
(Front Panel Mounted)
(Back Panel Mounted)
Cover
Cover
IB/KRU/06
