Discontinued Aiphone KB Series Replacement | Video Sentry Color Tilt | Secondary Answering Station | Selective Calling | Remote Door Release

The Aiphone KB-3HRD Color Video Sub Master Station is a professional-grade indoor video intercom answering station designed to expand or replace components in existing Aiphone KB Series Video Sentry Color Tilt Systems.

Featuring a 4-inch color TFT LCD monitor, built-in privacy handset, integrated speaker and microphone, and remote camera tilt controls, the KB-3HRD allows building occupants and authorized personnel to identify visitors, communicate with individuals at connected entrance stations, and activate compatible electric door-release equipment.

Designed to operate with the Aiphone KB-3MRD primary video master station, the KB-3HRD adds video answering capability at secondary locations throughout a commercial or residential property.

A compatible KB Series system supports up to three video door stations and five indoor answering stations total, including the KB-3MRD master and up to four additional sub stations.

The KB-3HRD offers selective room calling, internal All-Call communication, adjustable audio and display controls, entrance monitoring, and privacy mode, making it suitable for reception areas, offices, security stations, and other locations requiring convenient entrance communication.

When connected to a compatible KB-DAR video door station, the KB-3HRD can also control the entrance camera's vertical tilt angle for improved visitor identification.

Manufacturer Status: Discontinued. The KB-3HRD is no longer part of Aiphone's active product lineup. Availability is limited to remaining distributor inventory and replacement stock. Confirm availability and product condition before purchase.

Key Features

• 4-Inch Color TFT LCD Monitor: Displays video from compatible KB Series entrance stations.

• Secondary Video Answering Station: Adds another indoor video communication location to an existing KB-3MRD system.

• Built-In Privacy Handset: Supports private, full-duplex two-way conversations.

• Integrated Speaker and Microphone: Provides audio for entrance monitoring and compatible internal communication.

• Remote Camera Tilt Control: Adjusts the viewing angle of compatible KB-DAR video door stations.

• Instant Visitor Identification: Displays the entrance camera image and provides incoming audio when a visitor calls.

• Entrance Video Monitoring: View and listen at selected connected entrances without receiving an incoming call.

• Selective Room Calling: Call individual compatible indoor KB Series stations.

• Internal All-Call: Make announcements to connected indoor stations.

• Privacy Mode: Helps prevent unwanted monitoring during internal communication.

• Remote Door Release: Activate compatible entrance locking equipment through the KB Series system.

• Optional Selective Door Release: Supports multi-door release control using the RY-3DL adaptor.

• Door Call Indicator Lights: Three indicators identify the entrance requesting communication.

• Distinctive Door Chimes: Different entrance call patterns help identify the calling station.

• Adjustable Chime Volume: Customize entrance call notification levels.

• Adjustable Handset Volume: Control the receiver audio volume.

• Adjustable Audio Monitoring: Select the desired door-monitoring volume.

• Adjustable Display Settings: Provides image brightness and picture adjustment controls.

• Low-Light Entrance Viewing: Supports automatic illumination provided by compatible KB-DAR door stations.

• Two-Conductor Wiring: Connects through specified low-capacitance intercom cable.

• 24V DC Operation: Uses compatible Aiphone PS-2420UL power supplies.

• Expandable System: Supports up to four additional indoor sub stations per KB-3MRD master.

• Surface Wall Mount: Designed for secure installation in indoor locations.

• Optional Desktop Mount: Compatible with the Aiphone MCW-S/A desktop mounting stand.

• Legacy Replacement Component: Suitable for repairing or maintaining compatible KB Series systems.

Product Specifications

• Manufacturer: Aiphone

• Model / SKU: KB-3HRD

• Product Type: Color Video Sub Master / Secondary Answering Station

• Series: KB Series – Video Sentry Color Tilt

• Manufacturer Status: Discontinued

• UPC: 790143400378

• Housing Color: White

• Housing Material: Fire-Retardant ABS Plastic

• Display Type: TFT Color LCD

• Display Size: 4 Inches

• Touchscreen: No

• Communication: Full-Duplex Handset / Internal Open-Voice Communication

• Privacy Handset: Included

• Microphone: Built-In

• Speaker: Built-In

• Camera: Not Included – Displays Video from Compatible Door Stations

• Camera Control: Vertical Tilt with Compatible KB-DAR

• Video Monitoring: Supported

• Internal Communication: Selective Calling / All-Call

• Privacy Mode: Supported

• Door Release: Supported Through Compatible KB Series Controls

• System Door Release Contact Rating: 12V AC, 400mA

• Multi-Door Release Accessory: RY-3DL

• Power Requirements: 24V DC

• Compatible Power Supply: PS-2420UL

• Maximum Current Consumption: 260mA

• Standby Current Consumption: 80mA

• Power Supply Configuration: One Compatible Supply Per Two KB-3HRD Stations

• Wiring: 2-Conductor, Solid, Mid-Capacitance, Non-Shielded

• Recommended Cable: Aiphone #871802

• Maximum Master-to-Farthest-Sub Distance, 22 AWG: 165 Feet

• Maximum Master-to-Farthest-Sub Distance, 18 AWG: 330 Feet

• Maximum Power-Supply-to-Sub Distance, 22 AWG: 16 Feet

• Maximum Power-Supply-to-Sub Distance, 18 AWG: 33 Feet

• Maximum Video Door Stations Per System: 3

• Maximum Indoor Stations Per System: 5

• Maximum KB-3HRD Sub Stations: 4

• Maximum KB-3SD Audio Sub Stations: 2, Within the System's Four Sub-Station Limit

• Operating Temperature: 32°F to 104°F (0°C to 40°C)

• Dimensions: 7-11/16" H x 7-5/16" W x 3-5/16" D

• Dimensions (Metric): 195mm H x 185mm W x 84mm D

• Weight: Approximately 1.98 lbs. (900g)

• Mounting Type: Indoor Wall Mount / Optional Desktop Mount

• Optional Desktop Stand: MCW-S/A

• Installation Environment: Indoor

• System Compatibility: Aiphone KB Series with KB-3MRD Master Station

Compatible Aiphone Equipment

Master & Expansion Stations

• KB-3MRD: Primary Color Video Master Station with Handset

• KB-3HRD: Additional Color Video Sub Master Stations

• KB-3SD: Audio-Only Sub Master Station with Handset

Compatible Door Stations

• KB-DAR: Color Tilt Video Door Station

• KB-DAR-M: Color Tilt Video Door Station with Remote Activation Contacts

• IF-DA: Audio-Only Door Station for Supported KB Series Configurations

Power Supplies & System Accessories

• PS-2420UL: 24V DC Power Supply

• RY-3DL: Selective Door Release Adaptor

• RY-24L: Door Release Relay for Compatible Applications

• MCW-S/A: Optional Desktop Mounting Stand

• EL-12S: Compatible Electric Door Strike

• KC-32EU: Optional Legacy Picture Memory Accessory for Supported KB Systems

Compatibility Note: The KB Series is discontinued, and many compatible accessories may also have limited availability. Verify each component before ordering.

Recommended Applications

• Existing Aiphone KB Series System Repairs

• Replacement Video Sub Master Stations

• Commercial Office Buildings

• Reception and Security Desks

• Schools and Institutional Buildings

• Hospitals and Healthcare Facilities

• Assisted Living Facilities

• Government Buildings

• Apartment and Condominium Buildings

• Residential Properties

• Professional Office Suites

• Corporate Office Campuses

• Industrial and Manufacturing Facilities

• Warehouse and Employee Entrances

• Property Management Facilities

• Secondary Indoor Answering Locations

• Multi-Entrance Commercial Buildings

• Commercial Access Control Systems

• Legacy Video Intercom Maintenance

Video Monitoring & Communication Functions

1. Secondary Visitor Answering

The KB-3HRD provides a secondary answering location for compatible Aiphone KB Series systems.

When a visitor presses the call button at a connected entrance, the KB-3HRD displays the visitor's image and provides an audible notification.

Authorized personnel can then communicate with the visitor using the privacy handset.

2. Remote Camera Tilt Control

When connected to a compatible KB-DAR video door station, the KB-3HRD allows users to remotely adjust the vertical angle of the entrance camera.

The camera can tilt approximately 40°, helping users identify visitors of different heights.

Note: The KB Series uses a camera tilt function, not the digital PanTilt and Zoom technology found in newer Aiphone JP Series intercom systems.

3. Full-Duplex Privacy Handset

The integrated privacy handset provides simultaneous two-way communication with visitors at connected entrances.

This is particularly useful for reception desks, professional offices, healthcare facilities, and other locations where conversations may require additional privacy.

4. Selective Room Calling

The KB-3HRD supports communication with individual indoor KB Series stations.

Users can select a designated station and initiate an internal call to another location within the building.

5. Internal All-Call Communication

The All-Call function allows users to make announcements to connected indoor stations.

This feature is useful for office environments, security areas, and facilities requiring communication between multiple locations.

6. Privacy Mode

The KB-3HRD features a selectable privacy mode for internal communication.

When enabled, privacy mode helps prevent unintended room monitoring.

The function can be activated or deactivated using the station's All-Call control according to the manufacturer's operating instructions.

7. Remote Door Release

The KB-3HRD includes a door-release control that works with the compatible KB Series master station and properly connected electric locking equipment.

When configured for multiple entrances, the optional Aiphone RY-3DL adaptor supports selective door-release functions.

Important: The KB-3HRD does not independently supply operating power to an electric strike or magnetic lock.

8. Entrance Monitoring

The door-monitoring function allows authorized users to view and listen at connected entrances without receiving an incoming visitor call.

This provides convenient entrance observation from secondary indoor locations.

9. Low-Light Visitor Identification

When paired with a compatible KB-DAR video door station, the system supports automatic white-light illumination during low-light conditions.

The illumination is supplied by the entrance station, not the KB-3HRD monitor itself.

10. Adjustable Communication & Display Controls

The KB-3HRD provides convenient adjustments for:

• Door call chime volume

• Handset communication volume

• Entrance audio monitoring volume

• Monitor brightness

• Image tint and color

• Station privacy settings

• Door call tone selection and cutoff

These controls help users configure the station for different commercial and residential environments.

Installation & Compatibility

The Aiphone KB-3HRD is specifically designed for use as a secondary answering station within an existing Aiphone KB-3MRD Video Sentry Color Tilt Intercom System.

The KB-3HRD connects to the master station and other compatible sub stations using specified two-conductor, low-capacitance wiring.

Each KB-3HRD must be assigned a unique station number using its internal configuration switches.

The final station in the communication wiring arrangement must be properly terminated according to the manufacturer's instructions.

System Configuration

A compatible KB Series system supports:

• 1 KB-3MRD: Primary Video Master Station

• Up to 4 KB-3HRD: Video Sub Master Stations

• Up to 2 KB-3SD: Audio-Only Sub Stations, in place of video sub stations

• Up to 3 KB-DAR: Video Door Stations

The maximum combined number of indoor answering stations is five, including the KB-3MRD master.

Power Supply Requirements

The KB-3HRD requires 24V DC power.

For supported KB Series configurations:

• The KB-3MRD master uses its own compatible power supply.

• One PS-2420UL can power up to two KB-3HRD sub stations.

• Additional power supplies are required as the number of video sub stations increases.

• The maximum power supply cable distance must be maintained.

Wiring Requirements

• Use Aiphone-specified two-conductor intercom cable.

• Follow the correct master-to-sub station wiring arrangement.

• Assign the correct station number using the configuration switches.

• Set the termination switch correctly at the final video sub station.

• Connect power supplies according to the manufacturer's wiring diagram.

• Maintain the permitted cable lengths.

• Keep low-voltage intercom wiring separated from AC electrical wiring.

Mounting Options

• Wall Mount: Installs directly onto a suitable indoor wall.

• Desktop Mount: Uses the optional Aiphone MCW-S/A mounting stand.

• Installation Environment: Dry, protected indoor areas.

Important Installation Information

• This listing is for the KB-3HRD video sub master station only, not a complete intercom kit.

• Aiphone has discontinued the KB-3HRD.

• Requires a compatible KB-3MRD primary master station.

• Cannot operate as a standalone video intercom system.

• The station does not include a video door camera.

• The station uses a 4-inch non-touchscreen color LCD.

• Remote camera tilt requires a compatible KB-DAR video door station.

• The KB-3HRD is not compatible as a direct replacement for JO, JP, IX, or IXG Series equipment.

• Does not provide built-in Wi-Fi or smartphone application connectivity.

• Does not support PoE, SIP, or standard Ethernet networking.

• Does not include built-in visitor picture or video recording.

• Optional picture memory equipment, where supported, must be purchased separately.

• The station must be installed indoors.

• An appropriate 24V DC power supply is required.

• Compatible electric locking equipment and its power supply are sold separately.

• Additional master stations, door stations, power supplies, relay adaptors, and mounting accessories are sold separately unless specified otherwise.

• Verify the existing system wiring, power supplies, product condition, and compatibility before ordering.

Why Choose the Aiphone KB-3HRD?

The Aiphone KB-3HRD Color Video Sub Master Station is a practical replacement and expansion component for facilities maintaining existing KB Series intercom equipment.

Its 4-inch color monitor, built-in privacy handset, camera tilt controls, selective calling, All-Call communication, entrance monitoring, and remote door-release support provide dependable visitor communication from secondary indoor locations.

For commercial buildings, institutions, and residential properties with functioning KB Series installations, the KB-3HRD may allow an existing system to remain in service without replacing all connected intercom equipment.

Discontinued Product Notice: The KB-3HRD is no longer manufactured as part of Aiphone's active product lineup. Confirm inventory, condition, compatibility, and warranty terms before purchase.