Original ABB 500MBA02 power supply module for Unitrol 1000 excitation system, auxiliary power supply board for synchronous generator AVR spare part.

Product Overview

500MBA02 (1MRB150003R000B) is auxiliary power supply module of ABB Unitrol 1000 excitation system, used for synchronous generator and synchronous motor AVR automatic voltage regulator. It converts input power to multiple groups of stable DC working power, provides power supply for control board, signal conditioning circuit, relay and monitoring circuits inside excitation cabinet. It integrates over‑voltage, over‑current, short‑circuit and over‑temperature protection circuits, can output fault alarm signal when power abnormality occurs. Standard Eurocard plug‑in board, conformal‑coated PCB hardware resists vibration and electromagnetic interference inside excitation cabinet. Widely used as maintenance spare part for power‑plant turbine generator and hydro‑generator excitation control cabinets.

Key Features

• Dedicated auxiliary power supply for Unitrol 1000 excitation system, provides multi‑channel stable DC power for internal control circuits
• Built‑in over‑voltage, over‑current, short‑circuit and over‑temperature protection functions
• Fault self‑diagnosis, outputs dry‑contact alarm signal for power abnormal status
• Galvanic isolation between input power and control circuit to suppress electromagnetic interference
• Front‑panel LED indicators for power status and fault alarm
• Standard Eurocard plug‑in structure, installed inside excitation system cabinet

• Industrial‑grade conformal‑coated PCB for long‑term continuous operation in power‑plant environment

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Technical Specifications

• Brand: ABB
• Model: 500MBA02, 1MRB150003R000B
• Module Type: Excitation Auxiliary Power Supply Module
• System Platform: Unitrol 1000 AVR Excitation System
• Application: Synchronous generator / motor excitation control
• Power Supply: Excitation cabinet internal AC input
• Protection Functions: Over‑voltage, over‑current, short‑circuit, over‑temperature
• Operating Temp: 0℃ ~ +55℃
• Storage Temp: ‑40℃ ~ +85℃
• Humidity: 5‑95% non‑condensing

• Installation: Plug‑in inside Unitrol 1000 excitation cabinet

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Compatibility

Compatible with ABB Unitrol 1000 excitation system. After replacement, check power wiring, power output test and protection function verification required.