The Milestone ML 4RLC is a four-relay controller in a 19-inch 1U rack-mount format, built for professional AV control rooms and automation installations. It switches 230V AC loads through four independent relays and can be operated from the front-panel keypad, an optional remote keypad, or an RS232C interface, giving installers centralised control of lighting, projection systems, screens and other appliances from a single rack-mounted unit.

Key Features
Four independent relays for switching 230V/8A devices
19-inch 1U rack-mount chassis fits standard equipment racks
Front-panel keypad selection for relays one to four
RS232C interface plus remote keypad port for flexible control
LED indication for each relay channel and power status
Battery-backed memory keeps the last selected state
Optically isolated RS232C and relay circuits for safety
Plug-and-play installation for quick system integration

Applications
Auditorium and conference room lighting and presentation control
Rack-based AV and broadcast equipment power management
Multimedia demo and public address system control
Electrical automation in commercial and institutional buildings
Motor forward and reverse control with paired relay operation

Summary
The Milestone ML 4RLC rack-mount relay controller brings four relay channels into a standard 19-inch 1U unit, making centralised power control clean and space-efficient. With local, remote and RS232C control plus LED indication and battery-backed memory, it suits integrators managing lighting, displays and appliances across professional installations.