This is a Autec MP-G
250 Watt Step Down 300VDC to 5VDC DC/DC Converter

• Nominal Output Voltage: 5V
• Rated Output Current: 35A
• Max. Continuous Watts: 250W
• Max Input Voltage: 300V
• Voltage Adjust Setpoint: 4.950V-5.050V
• Voltage Adjust Range: 4.5V-5.5V
• Load Regulation no load-rated load, @ term:  <1%
                                 with Remote Sense: <0.2%
• Line Regulation: <0.1%
• Ripple & Noise: 50mVpp
• Overvoltage Protection Latching Shutdown: -5.9V-6.7V
• Overload Current Limit: <52.2A
• Short Circuit Current: <35ms (Survive any overload including short circuit, automatic recovery when load fault is removed.)

Dimensions: 90mm x 60mm x  30mm

Wiring diagrams; pin out designations; tech specs; & application notes available if requested before shipment