Description
ABB HESG324426R0001/HESG324389 REX010 Module
ABB HESG324426R0001 / HESG324389 REX010 Module Introduction
1. Product Overview
The REX010 is a plug-in auxiliary interface module marked with part codes HESG324426R0001 and HESG324389, designed for matching with series protection and control relays. It serves as an extended signal conversion and auxiliary logic unit, mainly used in medium voltage switchgear secondary circuits to expand digital input/output signal processing capacity for main protection devices. The module adopts an internal slot-mounted structure, which can be directly inserted into the base of corresponding relay equipment to realize seamless hardware matching without additional external mounting brackets.
ABB HESG324426R0001/HESG324389 REX010 Module
2. Hardware Structure & Terminals
The module is equipped with a set of terminal blocks for external wiring, which are divided into power supply terminals, digital signal input terminals and relay output terminals. Internal circuits are equipped with isolation components to separate the external secondary circuit from the main control board of the protection relay, effectively suppressing electromagnetic interference from on-site high-current switching devices. Multiple built-in miniature electromagnetic relays are used to output passive contact signals for alarm indication, interlock control and circuit breaker auxiliary signal transmission. Simple status indicator lights are arranged on the front panel to display module power status and channel action status, supporting quick on-site troubleshooting without auxiliary testing tools.
3. Core Electrical Specifications
- Operating power supply: wide-range AC/DC universal power supply compatible with conventional substation control power sources
- Digital input channels: multi-channel passive voltage detection inputs for collecting circuit breaker position, isolating switch status and external fault contact signals
- Output contacts: multi-group isolated relay contacts, capable of switching low-power AC and DC control loops
- Operating temperature range: -20°C to +70°C, suitable for long-term operation inside sealed switch cabinets
- Protection grade: IP20, only applicable for indoor cabinet installation
- Built-in anti-surge and short-circuit protection circuits to avoid damage caused by secondary wiring misconnection or short circuit
4. Main Functions
- Signal expansion: Increase the number of digital input and output points for the main protection relay, solving the problem of insufficient native I/O channels when complex interlock logic is required.
- Signal isolation: Realize electrical isolation between field hard-wiring signals and the core processing unit of the protection device, preventing interference surges from damaging the main board.
- Auxiliary logic output: Convert internal logical signals of the protection relay into passive contact signals to drive on-site alarm lamps, interlock loops and remote signal transmission circuits.
- Status monitoring: Real-time detection of power supply integrity and each signal channel status, feeding abnormal channel information back to the main relay for fault recording and local alarm prompt.
- Secondary circuit matching: Adapt to conventional current and voltage transformer secondary circuits, as well as various switch auxiliary contact signal acquisition modes commonly used in power distribution systems.
5. Typical Application Scenarios
This module is widely applied in medium voltage distribution switchgear, industrial plant power distribution rooms and small box-type substations. It cooperates with protection relays to complete signal collection and interlock control for feeders, distribution transformers and medium-voltage motors. It is particularly suitable for occasions requiring multi-point position signal collection and multi-group remote alarm output, such as ring network cabinet interlock control, transformer temperature alarm signal expansion and circuit breaker trip circuit status monitoring.
6. Basic Fault Diagnosis
- Power indicator off: Module power supply loss, loose slot contact or internal power circuit failure
- Channel indicator no response: Disconnected external signal wiring, damaged field auxiliary contacts or channel circuit breakdown
- Abnormal contact output: Relay contact burnout, excessive load current on output loop or wiring short circuit
- Frequent signal jitter: Lack of effective shielding for external wiring, insufficient circuit isolation or severe on-site electromagnetic interference
