ABB LD MUI-01 Multi-functional Human-Machine Interface Unit with IP65 Protection and 92 × 45 mm Installation

LD MUI-01 61320946 ABB Local multi-functional human-machine interface unit

Product Overview

ABB LD MUI-01 is a Local multi-functional human-machine interface unit specifically designed for Relion® 615, 620 and 650 series multi-functional protection relays (such as REF615, REM615, REF650, RED650, etc.) Multi-function User Interface. This device communicates with the main relay via a dedicated connection cable, providing an intuitive LCD display, operation keys and status indicators. This enables maintenance personnel to directly view measurement values, confirm alarms, execute control commands or configure parameters on-site without relying on remote SCADA or engineering laptops.

Core features

High visibility display
2-line × 16-character LCD backlit display screen
Supports multi-language menus including English, Chinese, Russian, etc. (depending on the host configuration)
Local operation function
View real-time measurement values (current, voltage, power, frequency, etc.)
Browse the event records and fault recording wave summaries
Confirm/reset the alarm and trip signal
Execute the open/close command of the circuit breaker (requires permission)
Modify some operating parameters (such as set values, authorization is required)
Status indication
LED indicator lights: Power, operation, trip, alarm
The buttons are equipped with haptic feedback and can be operated while wearing gloves

Technical parameters

Medium-voltage switchgear: Installed on the cabinet door, it enables local monitoring and operation
Motor Protection Center (MCC) : Quickly view motor status and reset overload faults
Remote substations: Provide basic human-computer interaction capabilities in areas without SCADA coverage
Equipment commissioning stage: Engineers conduct on-site tests of protection functions and verify set values
Renovation project: Install modern local interfaces for old relays (support from the main unit is required)

Installation and Usage instructions
Mechanical installation
The opening of the control cabinet door is 92 × 45 mm.
Insert the LD MUI-01 from the front and lock it with the snap at the rear.
Install the sealing gasket to ensure IP65 protection.
Electrical connection
Connect to the MUI interface on the back of the main relay using the included 8-core shielded cable.
The shielding layer of the cable needs to be grounded at a single point to prevent interference.
Operation process
Automatically synchronize the host data upon startup.
Use the arrow keys to browse the menu (measurement values, events, controls, etc.);
Press "Confirm" to perform the operation (such as "Trip Reset" or "CB Close");
When an alarm occurs, the red LED flashes and the screen displays the fault code.

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