GE D20-PS LFDSC143-4000 Power Supply Module

1. Product Overview

The GE D20-PS LFDSC143-4000 is a high-reliability power supply module designed for use within the GE D20 Remote Terminal Unit (RTU) family. This power supply delivers stable DC output to ensure continuous operation of the D20 CPU, communication, and I/O modules used in substation automation and SCADA systems. Built to meet the rigorous demands of utility and industrial environments, the D20-PS provides robust protection, wide input range support, and long operational life.

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2. Main Technical Specifications

Parameter	Specification
Manufacturer	GE (General Electric)
Model	D20-PS
Part Number	LFDSC143-4000
Type	Power Supply Module
Input Voltage Range	85 – 264 V AC or 125 V DC nominal
Output Voltage	5 V DC and 12 V DC regulated outputs
Output Power	Up to 40 W total
Efficiency	> 80% typical
Operating Temperature	–40°C to +70°C
Cooling	Natural convection (no fan required)
Mounting Type	Chassis-mounted or rack-mounted (within D20 system)
Protection Features	Overvoltage, overcurrent, and thermal protection
LED Indicators	Power and fault status

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3. Construction and Design

The GE D20-PS is housed in a durable metal enclosure with high electromagnetic compatibility (EMC) shielding to prevent interference. Internally, it features a high-efficiency switching converter circuit designed for continuous duty operation. Front-facing LED indicators provide instant visual status for output health and fault conditions. Its modular construction enables quick installation and replacement in D20 systems without special tools.

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4. Features and Benefits

• Wide input voltage range for flexible deployment in various power environments

• High conversion efficiency for reduced heat and energy loss

• Rugged industrial-grade design for substation and field operation

• Built-in fault protection against overvoltage, overload, and short circuits

• Hot-swappable design for easy maintenance

• LED diagnostic indicators for quick system monitoring

• Long service life and high reliability under continuous operation

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5. Application Areas

The GE D20-PS LFDSC143-4000 is widely applied in:

• Electric power substations (RTU and SCADA systems)

• Transmission and distribution automation

• Oil and gas pipeline control systems

• Industrial monitoring networks

• Renewable energy and smart grid systems

  
  

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6. Installation and Maintenance

• Install the D20-PS module in the designated power supply slot of the D20 RTU chassis.

• Connect input lines to the AC or DC power source following GE’s polarity and safety guidelines.

• Verify output voltage levels before connecting to load modules.

• Keep the module in a well-ventilated environment to maintain optimal cooling.

• Regularly inspect connectors and terminal blocks for secure fit and cleanliness.

• In case of LED fault indication, power down the system and check for overload or short-circuit conditions before restarting.

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7. Advantages in Power and Automation Systems

The GE D20-PS LFDSC143-4000 ensures uninterrupted power delivery to control and communication modules, enhancing the reliability of critical substation operations. Its rugged design, superior electrical protection, and long-term stability make it an essential component for mission-critical energy automation infrastructure.