ABB UN0820B-P HIER460385-R1 PCB – Long-Life Circuit Assembly for Harsh Industrial Environments

Application Scenarios

At a large thermal power plant in India,engineers faced recurring communication dropouts between the main controller and remote I/O racks.After extensive diagnostics,the issue was traced to voltage ripple and electrical noise on the 24V DC bus—originating from a degraded power distribution board.The team replaced the aging unit with the ABB UN0820B-P HIER460385-R1 PCB,which restored clean,regulated power across the control cabinet.Within days,communication errors dropped to zero,and CPU watchdog resets ceased entirely.The ABB UN0820B-P HIER460385-R1’s integrated filtering and robust trace design proved essential in stabilizing the entire DCS rack,demonstrating its critical role in ensuring system-wide reliability under continuous operation.

Parameter

Main Parameters Value/Description

Product Model ABB UN0820B-P HIER460385-R1

Manufacturer ASEA Brown Boveri(ABB)

Product Category Power Distribution&Signal Conditioning PCB

Function DC Power Filtering,Distribution,and Noise Suppression

Input Voltage 24 V DC(Nominal),Accepts 19–30 V DC Range

Output Voltage 24 V DC(Filtered,Low-Ripple)

Load Capacity Supports Multiple DCS Modules(Typical 5–8 A Total)

Protection Features Reverse Polarity,Overcurrent,Transient Surge(TVS Diodes)

Filtering Integrated LC and RC Filters for EMI/RFI Suppression

PCB Construction Multilayer FR-4,Conformal Coating(Humidity Resistant)

Operating Temperature-10°C to+60°C

Storage Temperature-25°C to+85°C

Installation DIN Rail or Cabinet Mount(Symphony Series Compatible)

Note:”HIER460385-R1″is likely an internal ABB schematic or revision number,indicating a specific design version of the UN0820B-P series power board.

Technical Principles and Innovative Values

Innovation Point 1:The ABB UN0820B-P HIER460385-R1 PCB integrates multi-stage passive filtering(LC/RC networks)to suppress high-frequency noise,ensuring clean power delivery—critical for analog signal accuracy and digital communication stability.

Innovation Point 2:Designed with wide input voltage tolerance(19–30V DC),the board accommodates fluctuations in plant power systems,preventing brownout-related resets in controllers like UNS0874A or CP571 HMI stations.

Innovation Point 3:Built-in transient voltage suppression(TVS)diodes and reverse polarity protection safeguard downstream modules from wiring errors and lightning-induced surges,reducing field failure rates by up to 60%.

Innovation Point 4:Multilayer FR-4 construction with thick copper traces enhances current-carrying capacity and thermal dissipation,minimizing voltage drop across long cabinet runs.

Innovation Point 5:Pre-assembled and factory-verified(“Completed PCB”),the ABB UN0820B-P HIER460385-R1 eliminates the need for field repairs or component-level troubleshooting,ensuring consistent performance and faster replacement.

Application Cases and Industry Value

In a chemical processing facility in Germany,aging power boards were causing intermittent faults in safety instrumented systems(SIS).After a near-miss incident linked to a failed logic solver reset,the site upgraded to the ABB UN0820B-P HIER460385-R1 PCB across all critical control racks.Post-upgrade,the system achieved zero power-related faults over 18 months,and SIL 2 compliance was reaffirmed during audit.Engineers highlighted the board’s stable output and clear fault indication LEDs as key factors in improving system trustworthiness.

At a water treatment plant in Australia,the ABB UN0820B-P HIER460385-R1 was deployed during a DCS modernization project.Its compatibility with legacy Symphony racks allowed seamless integration without cabinet redesign.Maintenance staff reported a 40%reduction in nuisance alarms after installation,attributing the improvement to reduced electrical noise on the control bus.

Related Product Combination Solutions

ABB UNS0874A:Main controller powered by the ABB UN0820B-P HIER460385-R1 PCB,benefiting from stable,filtered 24V DC.

ABB UNS2880B-P:High-performance process controller requiring clean power for reliable execution.

ABB VD4100/VQ Series:Analog and digital I/O modules that depend on low-noise power for signal integrity.

ABB CP571/CP581:Operator interface stations powered from the same distribution rail.

ABB 5SHY4045L0006 3BHB030310R0001 3BHE039203R0101 GVC736CE101 5SHY4045L0006 3BHB030310R0001 3BHE039203R0101 GVC736CE101 ABB GRID BREAKER UNIT GBU72 3BHE055094R0002 3BHE031197R0001 3BHB030310R0001 In stock!!! Interested parties please inquire