Milestone ML 4RLC-HV – 4-Channel High-Voltage Relay Controller Module

Name: Milestone ML 4RLC-HV – 4-Channel High-Voltage Relay Controller Module
SKU: 5147
Availability: InStock

Control various electric appliances setting at one place through remote keypad or local keypad or RS 232 interface.

The Milestone ML 4RLC-HV is a compact and reliable 4-channel relay controller module designed to control high-voltage electrical devices with ease and safety. It offers four individually controlled relay outputs, making it ideal for automation systems, security panels, industrial control, smart classrooms, and AV integrations.

Each relay channel is capable of handling high-voltage loads, and the module features LED indicators for status monitoring, screw terminals for secure wiring, and optically isolated inputs for safe operation. The ML 4RLC-HV is built for robust performance, ensuring precise switching and long operational life.

This unit is suitable for integration with central control systems, microcontrollers, or third-party automation controllers to trigger devices like lights, projectors, curtains, fans, or alarms.

Specifications

Parameter	Details
Brand	Milestone
Model	ML 4RLC‑HV
Channels / Relays	4 independent SPDT mechanical relays
Control Voltage	Typically 5 V / 12 V trigger (model-dependent)
Load Capacity	High‑voltage up to ~250 V AC or 30 V DC at ~10 A*
Input Isolation	Opto‑isolated control inputs
Indicators	LED status indicator per relay
Wiring	Screw‑terminal blocks
Mounting	DIN‑rail or panel mountable
Interface Options	Local keypad, RS‑232C, remote contact closure, RF/IR remote keypad (optional)
Unit ID Bits	3 or 2‑bit DIP switch to control up to 32–64 relays via RS‑232
Operation Modes	Normal or exclusive (relay pairs for bidirectional motor control)
Power Backup	Battery‑backed memory retains last relay state
Isolation	Optical isolation between RS‑232 and relay circuits
Dimensions (approx.)	Table‑top unit (~288×130×52 mm)
Weight (approx.)	~1.77 kg

Features

Four independently controlled high‑voltage relay channels with LED status indicators
Optically isolated control inputs for safe triggering
Screw‑type terminal connections for secure wiring
Supports multiple control modes: local keypad, RS‑232 commands, remote contact closure, RF/IR keypads
DIP‑switch configurable unit identifier to enable cascading of up to 32/64 relays under a single RS‑232 host
“Exclusive mode” pairing for forward/reverse motor control using relay pairs
Retains last relay states after power loss thanks to built‑in battery memory
Compact and robust design suitable for panel or DIN‑rail installation

What’s in the Box ?

Milestone ML 4RLC‑HV 4‑Channel Relay Controller Module
Mounting accessories (DIN‑rail brackets or panel screws)
Terminal block support caps or connectors (depending on model variant)
Power connection wiring guide
Optional local keypad (if this variant includes one; may require separate purchase)
LED indicators pre‑installed
Basic user handbook (printed or onboard guide)