General Information
Manufacturer: B&R Industrial Automation (ABB Group)

Series: X20 System

Model: X20PS4951

Type: System Power Supply Unit

Function: Provides 5V logic power for X20 backplane

Electrical Specifications
Input Voltage: 24V DC (19.2-30V range)

Input Current: 2.5A @ 24V (max)

Output Voltage: 5V DC (±1% regulation)

Output Current: 4A continuous (20W)

Efficiency: >85% (typical)

Ripple Noise: <100mVpp

Hold-up Time: >10ms @ full load

Protection Features
Overcurrent Protection: Auto-reset (5.5A limit)

Short Circuit Protection: Current limited

Overvoltage Protection: 6V shutdown threshold

Reverse Polarity Protection: On input side

Thermal Protection: Auto-shutdown with recovery

Mechanical Specifications
Dimensions: 30 × 100 × 70mm (W×H×D)

Weight: 180g

Mounting: DIN Rail EN 60715

Connector: Removable terminal block

Protection Class: IP20

Environmental Ratings
Operating Temperature: 0°C to +60°C

Full load up to 50°C

Derate linearly to 2A @ 60°C

Storage Temperature: -40°C to +85°C

Humidity: 5-95% non-condensing

Altitude: Up to 2000m without derating

Certifications
Safety: EN 62368-1

EMC: EN 61000-6-2/4

Industrial: CE, UL, RoHS

Typical Applications:

X20 system backplane power

Distributed I/O station power

Machine control cabinet power

Process automation systems