TRES-400-DEFENDER-B/K Quad Relay Access Controller for Multi Gate Access Systems

Defender 400 B/K Quad Relay Access Controller from Alfa Iris is a high-capacity RFID and Wiegand access control solution designed for demanding environments such as gated communities, commercial properties, and private security estates. Built with a weatherproof IP65-rated enclosure, this controller delivers reliable security management for both vehicle and pedestrian gates while supporting up to 20,000 users and 100,000 event records for large-scale installations.

Engineered for Reliable Access Control

The Defender 400 B/K offers powerful and flexible gate and door management with four reader ports and four configurable relays. Its distributed database controller allows both online and offline operation, ensuring uninterrupted access control even during network disruptions. Integrated diagnostic LED indicators provide clear system status monitoring, while TCP/IP communication allows seamless integration into modern network infrastructures.

• Supports up to 20,000 users with 100,000 event buffer
• 4 reader ports (2 in / 2 out) for flexible gate or door control
• Standard 26-bit Wiegand reader compatibility
• 4 configurable NO/NC relays for locks, gates, or access devices
• Remote door or gate release capability
• Real-time access processing and communication

Durable Outdoor Design for Demanding Environments

Housed in a lockable IP65 weatherproof enclosure with a hinged Lexan cover, the Defender 400 B/K is built to perform in harsh conditions. The internal swing-out mounting plate simplifies installation and maintenance, while the system operates reliably across a wide temperature range. This rugged controller is ideal for outdoor security installations where durability and reliability are essential.

• Weatherproof IP65-rated enclosure with hinged clear cover
• Operating temperature from -32°F to 149°F (-35°C to 65°C)
• Supports 10–90% non-condensing humidity
• Internal swing-out plate for simplified wiring and servicing
• Removable terminal strips for easy installation

Flexible Integration for Modern Security Systems

Designed for compatibility with a wide range of access devices, the Defender 400 B/K supports standard Wiegand readers and integrates easily with network-based access control systems via TCP/IP communication. It can control up to four gates or doors per controller and supports request-to-exit devices, motion sensors, and push buttons for flexible deployment across commercial and residential facilities.

• Gated communities and residential complexes
• Commercial and industrial facility access control
• Vehicle and pedestrian gate management
• Private security estates and restricted properties

Security installers and integrators seeking a scalable multi-door access controller will find the Defender 400 B/K from Alfa Iris to be a reliable and versatile solution for modern gate and door access control systems.

Technical Specifications

• Model: Defender 400 B/K
• Reader Ports: 4 (2 in / 2 out)
• User Capacity: Up to 20,000 users
• Event Buffer: Up to 100,000 events
• Reader Protocol: Standard 26-bit Wiegand
• Outputs: 4 NO/NC SPDT relays
• Request to Exit Inputs: 4
• Network Communication: TCP/IP (10/100 Mbps adaptive)
• Power Supply: 12VDC @ 3A
• Operating Temperature: -32°F to 149°F (-35°C to 65°C)
• Operating Humidity: 10–90% RH non-condensing
• Enclosure Dimensions: 11.8″ × 7.9″ × 6.7″ (300 × 200 × 170 mm)
• PCB Dimensions: 6.3″ × 4.2″ (160 × 106 mm)
• Enclosure Rating: IP65 weatherproof, lockable

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