The Alpha Communications 931A-120 Power Supply is an essential component for your intercom system, designed to deliver reliable amplification and power for your 870W, 8870, and 902 series handset intercom stations. This power supply ensures clear voice communication and convenient operation of electric door openers, all while being easy to install directly onto finished wall surfaces. With only one unit needed for your entire system, the 931A-120 offers both efficiency and functionality.
Alpha Communications 931A-120 Power Supply Features
- Easily Installs: Installs right on finished wall surfaces or in customer-supplied housing, simplifying the setup process.
- Single Unit Requirement: Only one power supply is needed for the entire system, regardless of the number of handsets, reducing costs and complexity.
- Clear Voice Fidelity: Features adjustable voice volume control for optimal sound quality, ensuring effective communication.
- Positive Screw Terminal Connections: Convenient connections make installation and maintenance straightforward.
- Standard Power Operation: Operates on standard 120VAC primary power, compatible with typical electrical setups.
Alpha Communications 931A-120 Detailed Specifications
| Power Supply Type | Amplifier/Power Supply |
| Compatible Handset Models | 870W, 8870, 902 Series |
| Installation Method | Surface Mount or in Customer Supplied Housing |
| Power Source | 120VAC |
| Connections Type | Positive Screw Terminals |
| Volume Control | Adjustable |



















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