Commercial Emergency Exit Alarm | Weather-Resistant Paddle Exit Device | 99 dB Siren | 2-Minute Alarm Cutoff or Manual Reset | Battery Operated

Protect commercial emergency exits against unauthorized use with the Alarm Lock 250WPXUS28 Sirenlock Weather-Resistant Alarmed Panic Exit Lock.

Manufactured by Alarm Lock, a division of NAPCO Security Technologies, the 250WPXUS28 combines a mechanical deadbolt and deadlatch with a battery-powered audible alarm to help discourage unauthorized exit through secured commercial doors.

The device features a paddle-style clapper plate that allows immediate mechanical exit when activated. If the exit is used while the alarm is armed, the built-in dual-tone piezo siren sounds to alert nearby personnel.

The alarm can be configured for a two-minute automatic cutoff or a continuous alarm that requires manual key reset.

Designed for installations exposed to outdoor weather, the 250WP offers weather-resistant construction and an operating temperature range of -20°F to 140°F (-29°C to 60°C).

The unit operates on a 9V battery, features an audible low-battery warning, and is designed for non-handed surface installation on compatible commercial single-door and paired-door openings.

Finished in US28 Aluminum, the Alarm Lock 250WPXUS28 is a practical security solution for warehouse exits, retail back doors, restaurants, theaters, industrial facilities, and other commercial emergency-exit applications.

Important: A compatible standard rim cylinder is required for key control and must be purchased separately.

Key Features

• Weather-Resistant Construction: Designed for suitable outdoor and exposed entrance applications.

• Paddle-Style Exit Activation: Large clapper plate provides convenient mechanical exit operation.

• Loud Dual-Tone Alarm: Manufacturer rates the weather-resistant version at 99 dB.

• Two-Minute Alarm Cutoff: Selectable alarm mode automatically stops sounding after approximately two minutes.

• Continuous Alarm Option: Alarm continues until manually reset with the key.

• Mechanical Deadbolt & Deadlatch: Provides mechanical locking and relatching.

• 1" Deadbolt Throw: Heavy-duty bolt with reinforced steel inserts.

• Immediate Exit Operation: Paddle mechanically releases the device without a delayed-egress countdown.

• Battery Powered: Operates using a 9V alkaline battery system.

• Low-Battery Warning: Audible beeping alerts personnel when battery replacement is needed.

• Long Battery Life: Approximately one year of standby operation under manufacturer-stated conditions.

• Non-Handed Design: Suitable for compatible left- or right-hand door applications.

• Surface-Mount Installation: Designed for commercial single-door or properly configured paired-door openings.

• US28 Aluminum Finish: Architectural aluminum finish for commercial door hardware.

• Key-Operated Arming & Disarming: Compatible standard rim cylinder required.

• Optional Exterior Key Control: Supports properly configured exterior rim-cylinder operation.

• Optional AC Power Accessories: Compatible external power accessories may be available for specified installations.

• UL-Listed Product Family: Manufacturer identifies the Sirenlock 250 Series as UL-listed panic alarm deadbolt equipment.

Product Specifications

• Manufacturer: Alarm Lock

• Parent Company: NAPCO Security Technologies

• Model / SKU: 250WPXUS28

• Product Family: Sirenlock 250 Series

• Product Type: Weather-Resistant Alarmed Panic Exit Lock

• Activation Style: Paddle / Clapper Plate

• Application: Commercial Emergency Exit Security

• Mounting: Surface Mount

• Handing: Non-Handed

• Finish: US28 Aluminum

• Housing: Die-Cast Metal

• Exit Plate: Aluminum Clapper Plate

• Locking Mechanism: Deadbolt and Deadlatch

• Deadbolt Throw: 1"

• Deadbolt Construction: Heavy Die-Cast Metal with Reinforced Steel Inserts

• Alarm Type: Dual-Tone Piezo Siren

• Weather-Resistant Alarm Rating: 99 dB, Per Manufacturer Product Literature

• Alarm Modes: Two-Minute Cutoff / Continuous Alarm with Key Reset

• Power Source: 9V DC Alkaline Battery

• Weather-Resistant Battery System: Sealed BP9 Battery Pack

• Typical Standby Battery Life: Approximately One Year

• Low-Battery Detection: Audible Warning

• Operating Temperature: -20°F to 140°F

• Device Width: 18"

• Device Height: 8-1/2"

• Device Depth: 3-1/4"

• Approximate Product Weight: 9 lb

• Approximate Manufacturer Shipping Weight: 10 lb

• Compatible Cylinder: Standard Rim Cylinder

• Cylinder Included: No

• Installation: Compatible Single or Double Doors with Appropriate Hardware

• External Power Accessories: AC9 / PP100, Subject to Application Compatibility

• Fire-Rated Door Approval: Must Be Verified for the Specific Opening

Alarm Operation

1. Normal Armed Condition

When the device is armed and the mechanical deadbolt is engaged, the exit remains secured against unauthorized entry.

The built-in alarm monitors the device's emergency exit operation.

2. Emergency Exit Activation

Pressing the clapper plate releases the mechanical locking components, permitting the door to open.

When the alarm is armed, activating the exit causes the siren to sound.

The device does not delay the mechanical release of the door.

3. Two-Minute Alarm Cutoff

The device can be configured to sound for approximately two minutes following an alarm activation.

After the programmed period, the alarm automatically stops.

4. Continuous Alarm with Manual Reset

For applications requiring a maintained warning, the device can operate in continuous-alarm mode.

The alarm continues until an authorized user performs the required key-reset procedure.

5. Authorized Key Operation

A compatible rim cylinder allows authorized personnel to arm or disarm the device.

When properly disarmed, the paddle can be operated without initiating the unauthorized-exit alarm.

6. Low-Battery Notification

The alarm includes an audible low-battery warning to alert maintenance personnel when the battery requires replacement.

This helps prevent unnoticed loss of the alarm function.

Weather-Resistant Construction

The 250WP version is designed for applications where the door hardware may be exposed to rain, precipitation, and varying temperatures.

Its weather-resistant design and specified operating range of -20°F to 140°F make it more suitable for exposed locations than the standard indoor 250 Series configuration.

Weatherproofing Note: Proper mounting, door preparation, and maintenance are required. Do not assume an independently certified IP or NEMA enclosure rating unless confirmed for the exact product revision.

Compatible Accessories

Alarm Lock CER Rim Cylinder

Standard rim cylinder for compatible Sirenlock arming and disarming applications.

Sold separately.

Alarm Lock 730 Single-Door Keeper

Replacement or accessory keeper for compatible single-door installations.

Alarm Lock 732 Double-Door Keeper

Special keeper for certain paired-door applications.

Alarm Lock 44 Double-Door Holder

Accessory for selected double-door configurations.

Alarm Lock 707 Exterior Door Pull

Exterior pull option for compatible commercial door installations.

Alarm Lock 711 Exterior Finger Pull

Compact exterior finger-pull accessory.

Alarm Lock BP9 / Weather-Resistant Replacement Battery

Replacement battery system for compatible weather-resistant Sirenlock devices. Verify the current manufacturer replacement part number before ordering.

Accessories are sold separately unless explicitly included in the selected package.

Recommended Applications

• Warehouse Emergency Exits

• Industrial Building Exits

• Retail Store Back Doors

• Restaurant Rear Exits

• Theater Emergency Exits

• Commercial Office Buildings

• Manufacturing Facilities

• Distribution Centers

• Government Facilities

• Institutional Buildings

• Commercial Service Entrances

• Exterior Emergency Exit Doors

• Unauthorized Exit Deterrence

• Commercial Exit Security Retrofits

Installation & Compatibility

The Alarm Lock 250WPXUS28 should be installed by a qualified commercial door hardware professional.

Installation Considerations

• Verify the existing door and frame construction.

• Confirm the required door handing and mounting arrangement.

• Use the manufacturer's mounting template.

• Provide the appropriate keeper or strike arrangement.

• Install a compatible rim cylinder for authorized key operation.

• Verify correct deadbolt engagement and deadlatch operation.

• Install and connect the proper 9V battery system.

• Select the required alarm operating mode.

• Test emergency mechanical release.

• Verify alarm activation and reset.

• Confirm that the installed assembly meets applicable fire and egress requirements.

Important Product Information

• The 250WPXUS28 is the weather-resistant paddle-style Sirenlock.

• It is not the 700 Series full-length push-bar device.

• A rim cylinder is required and is sold separately.

• The alarm is battery-operated.

• The device does not have a 15-second delayed-egress function.

• It is intended to permit immediate mechanical exit.

• The 250 model offers an alarm cutoff or continuous-alarm configuration; it should not be confused with the retriggering 260 model.

• Appropriate strike or keeper hardware depends on the door configuration.

• The alarm does not automatically provide remote monitoring or cellular notification.

• Installation on fire-rated or required-egress doors must be approved for the specific opening.

• Follow Alarm Lock installation instructions and applicable life-safety codes.

Why Choose the Alarm Lock 250WPXUS28?

The Alarm Lock 250WPXUS28 Sirenlock Weather-Resistant Alarmed Panic Exit Lock combines commercial mechanical exit security with a high-volume audible alarm to help deter unauthorized use of emergency exits.

With its weather-resistant construction, paddle-style operation, 9V battery power, one-inch deadbolt, selectable alarm modes, and US28 aluminum finish, the 250WPXUS28 offers a practical solution for commercial emergency doors exposed to outdoor conditions.