CHUBB 5 lever mortice lock fitted with single pole microswitch
5 lever shunt lock
The 3G114 is the most popular 5 lever mortice deadlock in the Chubb range offering excellent security protection for front doors.
BS 3621 67mm Lock Case, in satin chrome or brass
Union 3G114 BS3621 Mortice Deadlock with Single-Pole Alarm Microswitch
The Union 3G114E mortice deadlock is a trusted, high-security solution designed to meet BS3621:2007 standards, commonly required by insurance providers for external door protection. This model includes a single-pole microswitch, enabling integration with intruder alarm systems for added security response.
Product Highlights
- 5-Lever Mechanism – ensures high resistance to picking and over 1000 key differs.
- Microswitch Integration – allows monitoring via alarm panels.
- Supplied with:
- 3 brass keys
- 2 matching escutcheons (interior and exterior)
- BS-compliant security striking box in grey finish
Dimensions & Fitment
- Lock case sizes: 67mm (2.5") or 79mm (3")
- Corresponding backsets: 40mm and 53mm
- Not handed – suitable for left/right hinged doors, opening in or out
- Fits doors up to 54mm thick
(Contact us for longer keys if required for thicker doors)
Installation Notes
This Union lock is part of the long-standing C Series range, previously branded as Chubb. If you're replacing an older Chubb lock, this model is the direct equivalent under Union branding.
There is a non-BS version available – the 3G114 (without the “E”) – which lacks the reinforced bolt and hardened plates. Upgrading may require minor door adjustments.
Usage & Compliance
- Suitable for timber, composite, and metal doors
- Not recommended for fire door installations
- Meets requirements for insurance-grade locks
- Complies with EN50131-2-6:2008 (lock case)
For full compliance with BS3621, these locks feature:
- Hardened side plates for drill resistance
- Anti-pick levers
- Min. 20mm bolt throw
- Extensive key differ options
Customisation Options
- Keyed alike service available via our in-house locksmiths
- Additional keys available: choose genuine or copy blanks from this page
- Express delivery options available (larger quantities may take longer)
Learn More About Mortice Lock Standards
Need help understanding BS3621 vs BS8621 or choosing the right mortice lock? Check out the Master Locksmith Association's guide:
MLA Lock Standards Explained
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