KIRK - Model Type SKRU SD and HD Series -Solenoid Key Release Unit

The Type SKRU consists of an interlock, a solenoid, and an auxiliary switch. The solenoid is designed to permit removal of the interlock key in response to an external electric signal. The auxiliary switch is a quick-make, quickbreak device, which operates when the interlock key is rotated. Normally, the key is trapped in the SKRU and the solenoid is de-energized. To release the key, a signal must be sent to the solenoid from an external source.

The SKRU is typically used in combination with other KIRK® key interlocks. The SKRU can be manufactured with various mechanical and electrical options. The push button and/or the LED signal lamp are the most popular options. All components are UL recognized. The solenoid, optional signal lamp and optional push button are wired out to a terminal block along with some of the aux contacts. Please reference the wiring diagrams on our website for specific details. The main body of the SKRU is constructed of brass. The optional cover plate is stainless steel and the optional housing is fiberglass reinforced polymer.

• Mounting Options - unhoused, cover plate only, or housed. The photo above shows the unhoused SKRU. The cover plate mounted version is shown on the next page. The housed version is shown on the SD Series Data Sheet 2.2a. The housed SKRU is available front or back panel mounted. See drawing on page 4 of Data Sheet 2.2A, as well as the interlock ordering guide.
• Key Removable - energized or de-energized. Please specify. Key removable energized is by far the most common.
• LED Signal Lamp - indicates that the external electric signal has been sent to the solenoid.
• Push Button - connected in series with the solenoid - the push button must be pressed to allow the external electric signal to energize the solenoid.
• Solenoid Voltage- 120VAC, 24VDC, 48VDC, or 125VDC.
• Auxiliary Switch - double pole/double throw (DP/DT) is standard. The DP/DT switch is UL recognized and rated 10A 250VAC or VDC, or 15A125VAC or VDC. Four pole/double throw (4P/DT) is available.
• Gasket - available for weatherproofing with Housed option.
• Multi-Cylinder - up to 2 cylinders available. The two-cylinder SKRU can be keyed either of two ways, 1) both keys released together once the solenoid is energized or, 2) keyed so that one initiating key and the external signal to the solenoid are required to release a held key. See SD Series Data Sheet 2.2B (Unhoused) and/or SD Series Data Sheet 2.2C (Housed) for details.
• Stamp Key Interchange - specify an alphanumeric code to be stamped on the cylinder face and the key (e.g. A1, A2, B1, etc. - up to 5 characters). See SD Series Data Sheet for Keys (3.4) and Terminology (4.1) for details.
• Dust Covers - see SD Series Data Sheet for Dust Covers (3.1) for details.