ABB UNS4881B V1 3BHE009949R0001 | Excitation Control Unit Recommended products

Overview
The ABB UNS4881B V1 (3BHE009949R0001) is an excitation control board designed for ABB UNITROL 5000 and similar excitation systems. It provides precise regulation and stable operation of generator excitation, ensuring reliable voltage control and enhanced system efficiency in demanding industrial and power generation environments.

General Information
Brand: ABB
Country of Origin: Sweden
Part Number: 3BHE009949R0001
Model: UNS4881B V1
Series: UNITROL 5000 Excitation System
Product Type: Excitation Control / COB (Central Output Board)
Application: Generator and motor excitation control, power plant automation, and industrial power regulation

Power Specifications
Supply Voltage: 24 V DC nominal
Power Consumption: Approx. 50 W
Input Power Source: From control cabinet power bus
Protection Features: Over-voltage and short-circuit protection, fault monitoring, and redundancy capability

Communication & Interface
Function: Controls excitation output and communicates with other UNITROL 5000 modules
I/O Channels: Configurable digital and analog inputs/outputs
Interface: Rack-mounted board connection within the UNITROL 5000 excitation control system
Diagnostics: Built-in self-test and system monitoring indicators

Environmental
Operating Temperature: −25 °C to +70 °C
Storage Temperature: −40 °C to +85 °C
Humidity: Up to 95% RH (non-condensing)
Installation: Mounted inside excitation control cabinet; designed for industrial and power-generation environments

Dimensions & Weight
Dimensions (L × W × H): 450 × 47 × 47 mm
Weight: Approx. 0.67 kg

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