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Aiphone KB-3HRD Color Sub Room Station with Handset
Overview
The Aiphone KB-3HRD is a color sub room station designed for multi-station video intercom systems. This wall-mounted unit provides video identification and two-way voice communication across networked intercom stations, making it suitable for larger facility deployments where up to four sub stations can operate per system. The KB-3HRD delivers color video monitoring with full-duplex handset communication, enabling simultaneous two-way conversation while viewing incoming calls or monitoring entry points.
Key Features
- 4" LCD Video Display: Color screen for clear video identification and live monitoring of door stations or entry areas
- Full-Duplex Handset Communication: Simultaneous two-way voice transmission without switching between talk and listen modes
- Internal All Call Chime: Audible notification system for incoming calls to alert users within the facility
- Receiver Volume Control: Adjustable incoming audio level for customized listening comfort and operational flexibility
- Built-In Illumination: Integrated lighting for low-light operation environments, ensuring visibility of the display at all times
- Optional Selective Door Release: Compatible with the RY-3DL relay module for remote door lock activation from the sub station
- Instant Voice Call-In with Image: Incoming calls display video immediately, providing instant visual identification before response
- Surface Wall Mount: Direct wall mounting capability or optional desk mounting using the MCW-S/A accessory bracket for flexible installation
- Multi-Station Capacity: System supports maximum four sub room stations per installation, allowing distributed communication across multiple indoor zones
- Two-Conductor Wiring: Uses standard 2-conductor mid-cap solid non-shielded cable (Aiphone #871802) for straightforward installation and lower material costs
Integration & Compatibility
The KB-3HRD integrates with the complete Aiphone KB series intercom ecosystem. The master station (KB-3MRD) coordinates calls to all sub stations, and the system supports optional audio-only sub stations (KB-3SD) for cost-effective secondary locations that do not require video display. Door station options including the KB-DAR tilt video entry station and AX-DM audio mullion mount station interface seamlessly with the KB-3HRD for comprehensive building access and communication coverage.
Selective door release functionality requires the optional RY-3DL relay module, enabling authorized personnel at the sub station to trigger door unlocking mechanisms. This integration allows one-person reception or security monitoring operations without requiring separate unlock switches or additional control panels.
Installation Specifications
The KB-3HRD connects via 2-conductor, mid-cap, solid, non-shielded copper cable (Aiphone part number #871802). This standard twisted-pair configuration minimizes installation complexity and reduces overall system cost compared to multi-conductor or shielded alternatives. The unit mounts directly to interior walls using surface-mount hardware or can be positioned on a desk or counter using the optional MCW-S/A mounting accessory.
The sub station receives power and signal from the master station through a single two-wire connection, eliminating the need for separate power supplies or dedicated electrical wiring in secondary rooms. This simplified infrastructure reduces installation time and makes the KB-3HRD suitable for retrofit applications in existing facilities.
I've specified the Aiphone KB-3HRD for multi-location indoor facilities where distributed communication is critical. The 4" color LCD and full-duplex handset make this sub station practical for reception desks, nurse stations, and administrative offices that need video identification without complexity. The KB-3HRD performs well in controlled indoor environments where wall mounting space is available and moderate cable runs are acceptable.
Technical Highlights:
- Full-Duplex Communication: Handset-based two-way voice eliminates push-to-talk delays, enabling natural conversation during access control and visitor screening scenarios
- Integrated Display and Audio: 4" LCD monitor combined with receiver volume control consolidates video and communication into a single wall-mounted unit, reducing equipment footprint
- Selective Door Release Support: Optional RY-3DL relay integration allows the sub station to control door locks, centralizing access authority without secondary panels
- Two-Wire Architecture: Uses standard Aiphone #871802 cable, simplifying voltage drop calculations and enabling longer runs in larger buildings without signal degradation
Deployment Considerations:
- Confirm master station (KB-3MRD) capacity before exceeding four sub stations; the system architecture limits distribution to maintain audio clarity and video frame rate
- Plan cable routes for the two-conductor cabling early in design; while non-shielded cable reduces cost, ensure physical protection in high-traffic or exposed areas to prevent mechanical damage
- If door release is required, allocate budget for the RY-3DL relay module and associated electric lock control wiring in the installation scope
- Mount units in climate-controlled spaces; the KB-3HRD is designed for indoor use and does not include environmental ratings for exterior or harsh-duty applications
The KB-3HRD is a solid choice for multi-station indoor intercom deployments where video identification, clear two-way communication, and optional access control matter. Its straightforward two-conductor wiring and modular design fit well into phased facility rollouts and existing building infrastructures. Pair it with the KB-3MRD master and appropriate door stations to deliver a complete communication and access system.
