Alpro DB25L/PTLOCK Deadlocking Latch Bolt 12-24VDC PTL

Alpro DB25L/PTLOCK is a slimline deadlocking latch bolt featuring a world-first dual-action design combining a magnetic latch on the strike plate to capture the door with a deadbolt to secure it. Operating at 12-24VDC in fail safe (power to lock) mode, it delivers 1,000kgf holding force with a 16mm bolt throw and includes dual monitoring for bolt and door position.

The self-aligning magnetic latch ensures correct positioning of lock and strike every time, eliminating common alignment issues during installation. The built-in access control module provides selectable unlock periods of 0, 3, 6 or 9 seconds, multiple auto relock (9 attempts over 18 seconds), multiple unlock (5 attempts at 2-second intervals in fail secure mode) and anti-tailgate functionality. Suitable for single or double action, hinged or sliding doors in timber or metal, mounted vertically or horizontally.

About This Product

The Alpro DB25L/PTLOCK is a slimline deadlocking latch bolt with an innovative self-aligning magnetic latch that guarantees correct lock-to-strike positioning on every installation. It is designed for installers fitting concealed high-security locking on commercial doors where reliable alignment and robust holding force are critical. Choose this product when you need a compact deadlocking bolt with integrated access control features and dual monitoring in a fail safe configuration.

Key Features

• World-first dual-action: magnetic latch captures door, deadbolt secures it
• Self-aligning design ensures correct lock and strike positioning
• 1,000kgf holding force with 16mm bolt throw
• Built-in access control module with selectable unlock period (0/3/6/9 seconds)
• Anti-tailgate: immediately relocks after door opens and closes
• Dual monitoring: bolt position switch and door position switch
• 12-24VDC multi-voltage with built-in transient and reverse polarity protection
• Continuously rated solenoid

Technical Specifications

• Voltage: 12VDC to 24VDC +10%
• Current Draw (Activate) @ 12VDC: 1250mA
• Current Draw (Activate) @ 24VDC: 1000mA
• Current Draw (Hold) @ 12VDC: 160mA
• Current Draw (Hold) @ 24VDC: 95mA
• Holding Force: 1,000kgf
• Bolt Throw: 16mm
• Bolt Diameter: 12.7mm
• Function: Fail Safe / Power to Lock (PTL)
• Monitoring: Dual — bolt position switch + door position switch
• Faceplate Style: Radius cornered
• Dimensions (Main Unit): 210mm x 25mm x 42mm
• Dimensions (Back Box): 164mm x 22mm x 39mm
• Solenoid Rating: Continuously rated
• Protection: Built-in transient and reverse polarity protection
• Selectable Unlock Period: 0, 3, 6 or 9 seconds
• Multiple Auto Relock: 9 attempts over 18 seconds (fail safe only)
• Multiple Unlock: 5 attempts at 2-second intervals (fail secure mode)
• Guarantee: 5 years

Common Questions

• What makes this different from the standard DB25? The DB25L adds a magnetic latch on the strike plate that captures the door before the deadbolt engages, ensuring self-alignment every time.
• Can it be surface mounted? The DB25L is designed for concealed mortice mounting. A long strike plate with square hole is included.
• What doors is it suitable for? Single or double action, hinged or sliding doors in timber or metal, mounted vertically or horizontally.

Compatibility

• Supplied with long strike plate with square hole
• Compatible with Alpro access control systems
• Suitable for timber and metal doors

Dimensions

Dimensions
• 210 x 25 x 42mm (main unit L x W x D)
• 164 x 22 x 39mm (back box L x W x D)