Falcon A7851-24RX-LHR MA851 El...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$900.00
$461.22
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Falcon A7851-24RX-LHR MA851 Electrified Fail-Safe Mortise Lock Case with RX Switch, 24V, Left Hand Reverse, Field Reversible

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Model: A7851-24RX-LHR

In Stock (leaves warehouse same day if ordered before 3pm ET)

$900.00
$461.22
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Falcon A7851-24RX-LHR MA851 Electrified Fail-Safe Mortise Lock Case with RX Switch, 24V, Left Hand Reverse

The Falcon MA851 Electrified Mortise Lock Case is a commercial-grade replacement part engineered for demanding access control applications. Operating at 24V with a fail-safe configuration, this lock case incorporates an RX switch for door position monitoring and is factory-set for Left Hand Reverse (LHR) installation while remaining field reversible for installation flexibility. Armor front is not included and must be ordered separately. Designed for seamless integration into compatible Falcon mortise lock assemblies, this component delivers reliable electrified performance for commercial security systems.

Key Features

  • 24V Electrified Operation: Factory-configured for 24V power supply, ensuring compatibility with standard commercial access control and electrified hardware systems.
  • Fail-Safe Design: Fail-safe locking mode releases the lock upon loss of power, supporting life-safety egress compliance in commercial applications.
  • Field Reversible Handing: Though supplied as Left Hand Reverse (LHR), this lock case is field reversible, allowing adjustment on-site to accommodate varying installation requirements without ordering a separate unit.
  • RX Switch Included: Integrated RX (request-to-exit or door position) switch provides monitoring capability for access control system integration.
  • Armor Front Not Included: Armor front must be sourced separately, allowing installers to specify the appropriate front for their application and door preparation.
  • Commercial-Grade Replacement Part: Engineered as a direct replacement component for compatible Falcon MA851 series mortise lock assemblies in commercial environments.
  • Falcon Lock Parts Compatibility: Purpose-built Falcon replacement part for maintaining and servicing existing Falcon mortise lock installations.

Technical Specifications

  • Department: Door Hardware
  • Product Category: Mechanical Locks
  • Product Group: Parts and Accessories
  • Subcategory: Parts and Accessories
  • Product Subgroup: Parts and Accessories
  • Product Type: Miscellaneous Hardware
  • Parts and Accessories Type: Replacement Parts
  • Commercial/Residential: Commercial
  • Product Model: A7851-24RX-LHR
  • Features: Falcon Lock Parts

Typical Applications

  • Commercial Office Buildings with Access Control Systems
  • Healthcare Facilities Requiring Electrified Egress Hardware
  • Educational Institutions with Monitored Door Systems
  • Government and Municipal Buildings
  • Retail and Hospitality Properties
  • Multi-Tenant Commercial Properties
  • Industrial Facilities with Controlled Access Points

Why Falcon MA851?

Falcon MA851 electrified mortise lock cases are purpose-built for commercial-grade reliability, combining fail-safe operation with integrated RX switch monitoring in a field-reversible design. Engineered for demanding access control environments, this replacement component allows facilities to maintain the performance and security of their existing Falcon mortise lock installations with a manufacturer-matched part.

Manufacturer Resources

Product Specs

Department:
Door Hardware
Product Category:
Mechanical Locks
Product Group:
Parts and Accessories
Subcategory:
Parts and Accessories
Product Subgroup:
Parts and Accessories
Product Type:
Miscellaneous Hardware
Parts and Accessories Type:
Replacement Parts
Commercial/Residential:
Commercial
Product Model:
A7851-24RX-LHR
Features:
Falcon Lock Parts

Falcon A7851-24RX-LHR – Frequently Asked Questions

1) Does the Falcon A7851-24RX mortise lock case unlock when power is lost?
Yes. The A7851-24RX is the fail-safe version, so the lock releases when power drops. That is the configuration you want on an egress path or where a fire alarm interface has to free the door on alarm. If your opening needs to stay locked during a power failure, you need a fail-secure case instead, not this one.
2) I need a right hand door. Can the Falcon MA851 lock case be reversed in the field?
It ships set up Left Hand Reverse, but the case is field reversible, so you can change the handing on site without ordering a different part number. That means one part covers openings of either hand as long as you do the reversal per Falcon's instructions before you mortise it in.
3) Does the Falcon A7851 lock case come with the armor front?
No. The armor front is not included and has to be ordered separately. Plan on specifying the front that matches your door prep and finish at the same time you order the case, otherwise you will have a lock body with nothing to face the mortise pocket.
4) What voltage does the Falcon A7851-24RX electrified mortise lock case run on?
24V. It is factory configured for a 24V supply, so it drops into commercial access control power supplies and electrified hardware runs built around 24VDC. If your existing panel or transformer output is 12V, this case is not the one to order.
5) Is the Falcon MA851 a complete lockset or just the lock body?
Just the lock case. It is a replacement component for compatible Falcon MA851 series mortise lock assemblies, so trim, levers, cylinder and the armor front are separate. Buy it when you are servicing an existing Falcon mortise installation and need to swap in an electrified fail-safe case, not when you are hanging a brand new door with no hardware on it.
6) What does the RX switch on this Falcon mortise lock case actually do for my access control system?
The integrated RX switch gives your panel a signal from the lock itself, used for request-to-exit or door position monitoring. Practically, it lets the access control system know the inside lever was operated or the door status changed, so a legitimate exit does not register as a forced-door alarm. If your spec calls for lock monitoring, the switch is already built into this case.
7) We standardize on Falcon mortise locks across our buildings. Will this case match what is already in our doors?
It is a manufacturer-matched Falcon part intended for compatible Falcon MA851 series mortise lock assemblies, so it keeps existing installations on the same platform rather than mixing brands in the door. Confirm the door you are working on is an MA851 series mortise, and that you want the 24V fail-safe configuration with the RX switch, since those three things are fixed on this part number.
8) Is this Falcon electrified mortise case suitable for residential use, or is it commercial only?
It is a commercial-grade part, built for access-controlled openings in offices, healthcare, schools, government buildings, retail and hospitality, and multi-tenant properties. For a house door there is no practical reason to run 24V power and an RX switch into the lock.
How fast can I get the Falcon A7851-24RX-LHR delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Falcon A7851-24RX-LHR come with a warranty?
Absolutely. The Falcon A7851-24RX-LHR is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Falcon A7851-24RX-LHR?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
Why buy the Falcon A7851-24RX-LHR from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support, and rewards on every order. Our team is always ready to help you choose the right product for your project.
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