Alpha PK427A Dual 16VAC Form 'C' Relay Unit

Simplify door-control and access integration with the Alpha Communications PK427A Dual 16VAC Form 'C' Relay Unit. Designed for installers and security integrators, this relay unit converts a standard 16VAC intercom or amplifier output into two independent Form C contacts, allowing you to drive magnetic or different-voltage door openers without modifying existing power systems. The PK427A accepts a 16VAC input and provides two isolated switching outputs, delivering reliable control for access control, intercom, security, and surveillance systems.

Built for practical field use, the compact surface-mount enclosure installs on finished walls and features convenient barrier-type screw terminals for clean, professional wiring. Operating on low-voltage Class II wiring reduces installation complexity and improves safety on commercial and multi-tenant projects. Whether you’re expanding monitoring capabilities, integrating door release functions, or retrofitting older amplifiers, the PK427A gives you flexible, dependable relay control.

Ideal for access control, intercom, and security monitoring applications—add the Alpha PK427A to your next installation to streamline wiring and ensure dependable door-release performance.

• Convert a single 16VAC intercom/amplifier output into two independent relay contacts for expanded access control
• Supports dual 'Form C' outputs to trigger magnetic or alternate-voltage door openers without rewiring
• Surface-mount design installs quickly on finished walls for fast field retrofits
• Operates on safe low-voltage Class II wiring to simplify code-compliant installations
• Barrier-type screw terminals provide secure, professional wiring and easy serviceability