The IK543-3S from Alpha is an intercom kit that features our most popular apartment house intercom systems and configurations for buildings with 1 through 8 apartments, at a price that can’t be beat! Kit contains 1- IS204 (white) ‘Universal’ 4-wire indoor remote station (for each apartment), 1- IA543 intercom amplifier (with built-in electronic tone signal), 1- SS105B U.L. listed 16VAC plug-in transformer, 1- S1 Scrulox (Roberts head) screwdriver, 1- ‘ES0’ or ES612 series surface mount entry door station/panel (with 1-8 push-buttons) and a coil of 2PRJ, 3PRJ or 4PRJ or 12WJ intercom cable (footage and type depends upon kit model selected). Just add a 16VAC electric door strike to complete your building security system. We know of no other system that can offer all of these features at this cost. Other voltage door strikes and mag locks can be used with this system, with the addition of the PK407A auxiliary relay unit and additional door strike power supply.
Alpha IK543-3S Intercom Kit Features
- Simple loop wiring: Easily connect indoor stations for seamless communication throughout the building.
- Built-in electronic tone signal: Provides a clear alert to each indoor station, ensuring you never miss a visitor.
- Exceptional voice fidelity: Enjoy crystal-clear audio quality for effective communication.
- Easy Installation: All surface mount stations simplify the setup process, saving you time and effort.
- Built-in Door Release Capability: Integrate door release functionality with an optional time delay for enhanced security.
Alpha IK543-3S Detailed Specifications
| Indoor Station Model | IS204 (white) ‘Universal’ 4-wire indoor remote station |
| Amplifier Model | IA543 intercom amplifier with built-in electronic tone signal |
| Transformer | SS105B U.L. listed 16VAC plug-in transformer |
| Screwdriver | S1 Scrulox (Roberts head) screwdriver included |
| Door Station/Panel | ‘ES0’ or ES612 series surface mount entry door station/panel with 1-8 push-buttons |
| Intercom Cable | Coil of 2PRJ, 3PRJ, 4PRJ, or 12WJ intercom cable (footage and type varies by model) |



















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