Milestone ML 4RLC LV

The Milestone ML 4RLC LV is a four-relay controller designed for the reliable switching and control of low-voltage electrical loads between 3V and 48V from a single control point. Built for boardrooms, conference rooms, small automation projects and AV installations, it lets an operator switch up to four independent devices using the front-panel keypad, a remote keypad, contact closure, or a programmable RS232C interface without needing to be physically present at each load.

Key Features
• Four independent relays for switching low-voltage (3V to 48V) loads
• Front-panel keypad selection for direct local operation
• Remote keypad or contact closure via D9 male connector, operable up to 50 metres away
• RS232C interface via D9 female connector for computer or system-controller operation (9600 baud, 8-bit, 1 stop bit, no parity)
• Battery-backed relay status memory - relay states are restored automatically after a power cycle
• Optical isolation between the RS232C port and relay circuits for safer, more reliable operation
• DIP-switch exclusive relay pair mode for forward/reverse motor control
• LED indication for each relay and power status
• Unit identifier DIP switch allows multiple controllers to be addressed on a single RS232C line

Applications
• AV system power control in presentation rooms and boardrooms
• Low-voltage lighting control in offices, auditoriums and retail spaces
• Motor control for curtains, screens, gates, blinds and actuators using exclusive relay pairs
• Building automation and electrical switching from a centralised control point
• Equipment control in training rooms, laboratories and demonstration facilities

Summary
The Milestone ML 4RLC LV is a dependable low-voltage relay controller that brings four switching channels together in a compact table-top unit. Its combination of local keypad, remote and RS232C control, battery-backed status memory and optical isolation makes it a practical choice for integrators and facility managers who need to switch low-voltage equipment from one convenient location.