Commercial Key-Operated Access Control | Stainless Steel Faceplates | SPDT & DPDT Switches | Optional LED Indicators | Weather-Resistant Options

Provide dependable, authorized key-operated control for commercial doors with the Alarm Controls MCK Series Mortise Cylinder Key Switch Stations.

Manufactured by Alarm Controls, an ASSA ABLOY company, the MCK Series provides reliable electrical switching for properly designed commercial access-control, electronic door-release, and security-monitoring systems.

Available in 1-3/4-inch narrow-stile and standard single-gang configurations, these stations are designed to accept a compatible standard 1-1/8-inch mortise cylinder, allowing authorized personnel to operate an electrical control circuit using a conventional key.

Choose from momentary-action, alternate-action (latching), DPDT, SPDT, and adjustable pneumatic time-delay configurations to match the requirements of the installation.

Selected models also include green or red-and-green LED indicators, allowing visual status indication when connected to an appropriate electrical monitoring circuit.

Built with durable stainless steel wall plates, tamper-resistant mounting hardware, and color-coded electrical leads, the MCK Series is suitable for commercial offices, warehouses, industrial facilities, schools, hospitals, government buildings, and secured employee entrances.

The MCK Series also includes selected weather-resistant single-gang models, supplied with a protective cover and surface-mount back box.

Important: Mortise cylinders and keys are sold separately. Compatible Alarm Controls CY-1 keyed-different and CY-1A keyed-alike cylinders are available.

Key Features

• Key-Operated Access Control: Allows authorized users to operate compatible electrical control circuits with a mortise cylinder and key.

• Six Standard Model Configurations: Available with narrow-stile or single-gang plates and multiple LED options.

• SPDT or DPDT Switches: Choose between single-pole and double-pole switching arrangements.

• Momentary Operation: Switch activates while the key is turned to the operating position.

• Alternate-Action Operation: Maintains the selected electrical contact state until operated again.

• Pneumatic Time Delay: Selected single-gang models provide an adjustable 2–45-second timed function.

• 4A Contact Rating: Standard switches are rated at 4 amps at 28V DC.

• Green LED Options: Available on MCK-2 and MCK-5 configurations.

• Red & Green LED Options: Available on MCK-3 and MCK-6 configurations.

• 12/24V AC/DC LED Operation: Indicator-equipped models support compatible low-voltage illumination circuits.

• Stainless Steel Construction: Durable wall plates offer a professional architectural appearance.

• Narrow-Stile Mounting: MCK-1, MCK-2, and MCK-3 models feature 1-3/4-inch-wide plates.

• Single-Gang Mounting: MCK-4, MCK-5, and MCK-6 models feature standard single-gang plates.

• 1-1/8" Mortise Cylinder Compatibility: Accepts compatible standard mortise cylinders.

• Tamper-Resistant Mounting Hardware: Supplied with tamper-proof and slotted-head screws.

• Color-Coded Switch Leads: Simplifies wiring to compatible access-control equipment.

• Compact Installation Depth: Switch assembly requires approximately 1-1/4 inches behind the plate.

• Weather-Resistant Options: Available with protective cover and surface-mount box for selected single-gang models.

• Compatible Replacement Cylinders: Alarm Controls CY-1 and CY-1A available separately.

• Commercial-Grade Design: Suitable for professionally installed security and electronic door-control systems.

Available Models

MCK-1 – Narrow-Stile Mortise Cylinder Key Switch

The Alarm Controls MCK-1 is a slimline stainless steel key-switch station designed for narrow commercial door frames and storefront mullions.

Specifications:

• SKU: MCK-1

• Mounting: 1-3/4" Narrow Stile

• Plate: Stainless Steel

• Switch: SPDT Momentary

• Contact Rating: 4A at 28V DC

• LED: None

• Cylinder: Standard 1-1/8" Mortise, Sold Separately

MCK-2 – Narrow-Stile Key Switch with Green LED

The Alarm Controls MCK-2 provides the same narrow-stile mounting design as the MCK-1, with an integrated green LED for compatible visual status monitoring.

Specifications:

• SKU: MCK-2

• Mounting: 1-3/4" Narrow Stile

• Plate: Stainless Steel

• Switch: SPDT Momentary

• Contact Rating: 4A at 28V DC

• LED: Green

• LED Voltage: 12/24V AC/DC

• Cylinder: Sold Separately

MCK-3 – Narrow-Stile Key Switch with Red & Green LEDs

The Alarm Controls MCK-3 features a narrow-stile stainless steel plate with two indicator LEDs.

Specifications:

• SKU: MCK-3

• Mounting: 1-3/4" Narrow Stile

• Plate: Stainless Steel

• Switch: SPDT Momentary

• Contact Rating: 4A at 28V DC

• LEDs: Red and Green

• LED Voltage: 12/24V AC/DC

• Cylinder: Sold Separately

MCK-4 – Single-Gang Mortise Cylinder Key Switch

The Alarm Controls MCK-4 provides a standard single-gang mounting arrangement for compatible mortise-cylinder control applications.

Specifications:

• SKU: MCK-4

• Mounting: Single Gang

• Plate: Stainless Steel

• Switch: SPDT Momentary

• Contact Rating: 4A at 28V DC

• LED: None

• Cylinder: Sold Separately

• Weather-Resistant Option: Available

MCK-5 – Single-Gang Key Switch with Green LED

The Alarm Controls MCK-5 adds a green LED indicator to the standard single-gang configuration.

Specifications:

• SKU: MCK-5

• Mounting: Single Gang

• Plate: Stainless Steel

• Switch: SPDT Momentary

• Contact Rating: 4A at 28V DC

• LED: Green

• LED Voltage: 12/24V AC/DC

• Cylinder: Sold Separately

• Weather-Resistant Option: Available

MCK-6 – Single-Gang Key Switch with Red & Green LEDs

The Alarm Controls MCK-6 features red and green LED indicators in a single-gang key-switch station.

Specifications:

• SKU: MCK-6

• Mounting: Single Gang

• Plate: Stainless Steel

• Switch: SPDT Momentary

• Contact Rating: 4A at 28V DC

• LEDs: Red and Green

• LED Voltage: 12/24V AC/DC

• Cylinder: Sold Separately

• Weather-Resistant Option: Available

Switching Options

SPDT Momentary – Standard Models

The standard MCK models feature SPDT momentary-action switches.

Turning the key operates the switch, which returns to its original position when the actuator is released.

Available on all six base models.

SPDT Alternate Action – Suffix -2

Alternate-action versions change and maintain their electrical state until the switch is operated again.

Examples:

• MCK-1-2

• MCK-2-2

• MCK-3-2

• MCK-4-2

• MCK-5-2

• MCK-6-2

DPDT Momentary – Suffix -3

DPDT momentary configurations provide two sets of changeover contacts for compatible control applications.

Examples:

• MCK-1-3

• MCK-2-3

• MCK-3-3

• MCK-4-3

• MCK-5-3

• MCK-6-3

DPDT Alternate Action – Suffix -4

These models combine DPDT switching with maintained alternate-action operation.

Examples:

• MCK-1-4

• MCK-2-4

• MCK-3-4

• MCK-4-4

• MCK-5-4

• MCK-6-4

Pneumatic Time Delay – Suffix -5

Selected single-gang stations are available with adjustable pneumatic time-delay functions.

Available models:

• MCK-4-5

• MCK-5-5

• MCK-6-5

Manufacturer-Published Timer Range: 2–45 seconds.

These versions are intended for applications requiring a controlled switching interval rather than a basic momentary or maintained contact.

The pneumatic timer must not be confused with a code-approved delayed-egress controller.

Product Specifications – Series Overview

• Manufacturer: Alarm Controls

• Parent Company: ASSA ABLOY

• Series: MCK

• Product Type: Mortise Cylinder Key Switch Station

• Operation: Key Activated

• Standard Cylinder Size: 1-1/8"

• Mortise Cylinder Included: No

• Keys Included: No

• Plate Material: Stainless Steel

• Mounting Options: Narrow Stile / Single Gang

• Narrow-Stile Plate Width: 1-3/4"

• Standard Switch Rating: 4A at 28V DC

• Switch Contact Options: SPDT / DPDT

• Switch Actions: Momentary / Alternate Action

• Timed Models: Pneumatic, 2–45 Seconds

• LED Options: None / Green / Red and Green

• LED Voltage: 12V or 24V AC/DC

• Depth Behind Plate: 1-1/4"

• Switch Terminations: Color-Coded Leads

• Included Hardware: Tamper-Proof and Slotted-Head Screws

• Operating Temperature: 15°F to 120°F (-9°C to 49°C)

• Weather-Resistant Configurations: Selected Single-Gang Models

• Compatible Cylinders: CY-1 / CY-1A

• Application: Commercial Electronic Access Control

Compatible Mortise Cylinders

Alarm Controls CY-1 – Keyed Different

• 1-1/8" standard mortise cylinder

• Straight cam

• Keyed different

• Two keys included with separately purchased cylinder

Alarm Controls CY-1A – Keyed Alike

• 1-1/8" standard mortise cylinder

• Straight cam

• Keyed alike

• Two keys included with separately purchased cylinder

Important: The MCK key-switch station itself is supplied without a mortise cylinder or keys.

Customers should order the appropriate CY-1 or CY-1A cylinder separately or verify compatibility with an existing cylinder.

Compatible Electronic Access Control Equipment

MCK key-switch stations may be integrated with properly designed systems utilizing:

• Commercial Electromagnetic Locks

• Electric Strikes

• Electrified Locking Hardware

• Access-Control Controllers

• Key-Operated Door Release Circuits

• Electronic Security Relays

• Remote Lock Control Panels

• Security Monitoring Systems

• Door-Position Monitoring Equipment

• Regulated Low-Voltage Power Supplies

The MCK station provides mechanical key operation and electrical switching. It does not independently power or unlock an electric locking device.

Recommended Applications

• Commercial Office Buildings

• Aluminum Storefront Entrances

• Hollow Metal Commercial Doors

• Narrow-Stile Door Frames

• Warehouse and Industrial Facilities

• Schools and Universities

• Hospitals and Healthcare Facilities

• Government and Institutional Buildings

• Secured Employee Entrances

• Restricted Access Areas

• Security Control Stations

• Electronic Door Release Systems

• Magnetic Lock Control

• Commercial Access-Control Retrofits

Installation & Compatibility

Alarm Controls MCK Series stations should be installed by qualified access-control and commercial door hardware professionals.

Installation Considerations

• Select the appropriate narrow-stile or single-gang mounting configuration.

• Verify the selected cylinder's length and cam compatibility.

• Allow adequate space for the 1-1/4" switch depth and wiring.

• Secure the station using manufacturer-supplied hardware.

• Connect the switch contacts according to the appropriate wiring diagram.

• Verify that electrical loads do not exceed the published contact ratings.

• Supply appropriate 12/24V AC/DC power to any LED indicators.

• Select the correct momentary, alternate-action, or pneumatic timing configuration.

• Test the complete key-switch function.

• Confirm all required emergency-release and life-safety controls operate correctly.

Important Installation Information

• Mortise cylinder and keys are not supplied with standard MCK stations.

• Standard models accept compatible 1-1/8" mortise cylinders.

• The LED indicators require appropriate external electrical connections.

• LEDs do not independently detect door or magnetic-lock status.

• The MCK Series does not include an electric strike or magnetic lock.

• Mechanical key operation does not independently provide electrical power.

• The 2–45-second pneumatic timer option is available only on selected single-gang models.

• The weather-resistant option is available only on designated single-gang configurations.

• The standard indoor models should not automatically be treated as weatherproof.

• Alternate-action models must be selected carefully for applications involving required emergency egress.

• An MCK station is not a replacement for code-required panic hardware or approved emergency-release equipment.

• Additional components may be necessary to comply with access-control, fire, accessibility, and life-safety requirements.

• Installation must follow the manufacturer's instructions and local Authority Having Jurisdiction requirements.

Why Choose Alarm Controls MCK Series?

The Alarm Controls MCK Series Mortise Cylinder Key Switch Stations provide flexible, key-operated electronic control for professional commercial security systems.

With stainless steel plates, narrow-stile and single-gang mounting options, 4A switching capability, optional LED indicators, SPDT/DPDT contacts, alternate-action switches, and pneumatic timing configurations, the MCK Series supports a wide range of commercial access-control applications.

For facilities requiring physical-key authorization to operate electronic door hardware, the Alarm Controls MCK Series provides durable construction and flexible switching options in a compact architectural design.