Overview
The Polyamp PU300C24 NTC is a compact, industrial-grade DC/DC converter that steps down higher DC voltages (85–150VDC input) to a stable 24VDC output at 12.5A, delivering up to 300W of power. This Options H variant is engineered for applications where reliable, regulated power conversion is critical in harsh or electrically noisy environments such as railways, telecommunications, and industrial automation systems.
Key Features
- Wide Input Voltage Range: Accepts 85–150VDC input, accommodating battery-backed and unregulated rail supplies
- Protected Output: Overvoltage protection (OVP) and reverse polarity protection safeguard downstream equipment
- Stable 24V Output: Delivers clean, regulated 24VDC at up to 12.5A for consistent device operation
- Remote Sensing & Alarming: Includes remote voltage sensing and over/undervoltage alarm relay for system monitoring
- Convection Cooled: Passive cooling design requires no fans, reducing maintenance and EMI concerns
- Adjustable Output Voltage: Fine-tune output voltage for precise control in critical applications
Technical Specifications
- Input Voltage Range: 85–150 VDC
- Output Voltage: 24 VDC (adjustable)
- Output Current: 12.5 A
- Power Rating: 300 W
- Efficiency: >88% typical
- Operating Temperature: −25 to +55°C (standard); optional −40 to +70°C
- Cooling Method: Convection (passive)
- Protection: Overvoltage (OVP), reverse polarity, undervoltage alarm
- Remote Sensing: Yes
- Alarm Relay: Over/undervoltage conditions
- Series: Polyamp PU300 (Options H variant)
Typical Applications
The PU300C24 NTC is ideal for:
- Railway rolling stock and trackside power distribution
- Telecommunications equipment and base stations
- Industrial automation systems and PLCs requiring stable 24V logic supply
- Emergency backup power systems (UPS, battery chargers)
- Marine and military installations where EMC and environmental stress are high
- Heavy industrial switchgear and power control enclosures
Compatibility & Replacements
Compatible With
- Industrial control systems and PLCs operating on 24VDC logic supply
- Battery backup systems and unregulated rail power supplies (85–150V DC)
- Telecom and railway power distribution networks
- Systems requiring remote voltage monitoring and alarm functions
- Environments with high EMI and electrical noise (military, marine, industrial switchgear)
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator or electrical engineer before ordering to confirm this unit meets your exact input voltage, output amperage, and protection requirements. Other Polyamp PU300 variants with 24VDC output may be substitutes; consult Polyamp or your distributor for alternative model numbers.
Works With
- Industrial DC power supplies and battery systems (85–150VDC input)
- 24VDC logic and control circuits in automation and instrumentation
- Monitoring systems supporting remote sensing and alarm relay outputs
- Convection-cooled cabinet and enclosure installations (DIN-rail, 19″ rack, or wall-mount compatible)
