Aiphone NIM-40B 40-Call Master Station with Handset

Aiphone NIM-40B 40-Call Master Station with Handset

Overview

The Aiphone NIM-40B is a 40-call master station designed for mid-to-large-scale intercom installations. Built with fire-resistant ABS plastic panel and SPCC chassis construction, the NIM-40B (often searched as NIM 40B) serves as the central hub for multi-unit door entry and internal communication systems. The unit accommodates up to 40 door stations, sub stations, ceiling speakers, and wall jacks, making it suitable for apartment buildings, office complexes, schools, and healthcare facilities. Communication occurs via handset for private conversations or push-to-talk simplex mode for hands-free operation.

Key Features

• 40-Call Capacity: Supports up to 40 door stations, sub stations, ceiling speakers, and wall jacks on a single master unit
• Selective, Group, and All-Call Functions: Directs calls to individual units, specific groups, or broadcasts to the entire system
• Handset with VOX Communication: Provides privacy during two-way conversations; handset-based operation or voice-activated (VOX) simplex push-to-talk
• Fire-Resistant Construction: Panel made from fire-resistant ABS plastic; SPCC steel chassis for durability
• Volume Controls: Independent volume adjustment for incoming calls and handset operation
• Flexible Mounting: Wall or ceiling installation options to suit facility layout
• Extended Wiring Distance: Door station and sub station connections support up to 650 feet (18 AWG wire); power supply to master station up to 33 feet (18 AWG)
• Shielded Wiring Requirement: Uses 3-conductor overall shield cable (Aiphone #821803) for reliable signal transmission between all connected devices

Integration & Compatibility

The NIM-40B integrates with Aiphone's full line of door stations, sub stations, ceiling speakers, and wall jacks. Installation uses standard 3-conductor shielded cabling, reducing design complexity. The unit ships with a 48V DC power supply (UL listed IS-PU-UL model), ensuring safe, regulated operation. Integrators can pair the NIM-40B with Aiphone accessory products including call reset buttons, corridor lights with magnetic nameplates (supporting 1, 2, or 4 names), and single-room call lights to enhance user experience and system visibility.

Power and Installation Specifications

The system operates on 48V DC delivered via the included UL-listed power supply. Maximum wiring distances are 650 feet from door or sub stations to the master unit (using 18 AWG shielded cable) and 33 feet from power supply to master station. These specifications ensure proper voltage delivery and signal integrity across the installation footprint. All components must use Aiphone #821803 3-conductor overall shield cable for proper operation.

Karl Wilson

The Aiphone NIM-40B is a workhorse for multi-unit residential and commercial installations where centralized call management is essential. In my deployments, I've found the 40-call capacity strikes the right balance between feature-rich operation and system simplicity—large enough for mid-rise apartments or office parks, yet compact enough to fit standard equipment rooms without redundant master units.

Technical Highlights:

• Call Routing Flexibility: Selective, group, and all-call modes allow fine-grained control over who receives notifications, reducing call fatigue and improving tenant or employee satisfaction.
• Robust Wiring Infrastructure: The 650-foot reach to door stations (at 18 AWG) accommodates most building layouts without requiring intermediate boosters. The shielded cable specification (Aiphone #821803) is critical—don't substitute generic twisted pair, as it will degrade signal quality.
• Fire-Resistant Materials: The ABS plastic panel and SPCC chassis meet building code requirements for common areas and interior installations.

Deployment Considerations:

• Verify your power supply location relative to the 33-foot limitation from supply to master unit; larger buildings may need distributed power or a secondary master station (NIM-20B for smaller zones).
• Budget for proper 3-conductor shielded cabling throughout the installation—cutting corners on cable quality will result in noise, crosstalk, and dropped calls.
• Test handset audio levels and VOX sensitivity during commissioning; ambient noise levels vary significantly between lobbies, corridors, and office spaces.

For integrators handling multi-family or institutional projects, the NIM-40B reduces engineering complexity by eliminating the need for multiple smaller master stations. It's a dependable platform that prioritizes operational simplicity and long-term maintainability.