In high-voltage power substations, the DC auxiliary power system is the lifeline that keeps protection relays, SCADA systems, and communication equipment running. When this power chain fails, the consequences are severe:
- Protection relay malfunction during fault conditions
- SCADA communication loss between substation and control center
- Circuit breaker failure to trip on demand
- Uncontrolled power outages affecting thousands of consumers
- Equipment damage from sustained fault currents
Substation environments impose extreme demands on power equipment: high-voltage transients, electromagnetic interference from switchgear operations, wide temperature swings, and the need for uninterrupted 24/7 operation. Conventional power modules simply cannot withstand these conditions.
The MDN4000-360S48 is a high-power isolated DC-DC converter specifically engineered for power automation and ultra-high voltage input applications.
Key Specifications:
| Parameter |
Value |
| Input Voltage |
360VDC (Range: 280–500VDC) |
| Output Voltage |
48VDC |
| Output Current |
83.3A |
| Output Power |
4000W |
| Efficiency |
93% |
| Isolation |
Input-output dual electrical isolation |
| Communication |
CAN bus |
| Cooling |
Fan cooling + internal thermal potting |
| Protection Rating |
IP65 |
| Dimensions |
301 × 261 × 124mm |
Multiple ultra-high voltage input ranges available:
| Option |
Input Voltage Range |
| Standard |
280–500VDC |
| Extended Range 1 |
350–750VDC |
| Extended Range 2 |
400–850VDC |
| Extended Range 3 |
600–1100VDC |
| Extended Range 4 |
900–1500VDC |
Power options from 3000W to 6000W. Contact us for customization.
The fully sealed aluminum housing with internal potting provides exceptional resistance against:
- Moisture and humidity
- Dust and particulate contamination
- Vibration and mechanical shock
- Electromagnetic interference from switchgear operations
Power substations operate with DC bus voltages ranging from 220V to 800V+ and require reliable conversion to 48V for communication and control equipment. The MDN4000-360S48 addresses these demands directly:
Ultra-wide input range (280–500VDC) — absorbs voltage fluctuations from the substation DC bus without output disruption, with additional ranges available up to 1500VDC for high-voltage applications.
Dual electrical isolation (input-to-output) — protects both downstream equipment and personnel from high-voltage transients, a critical safety requirement in substations.
Surge and spike suppression — effectively suppresses surges, spikes, and EMI from switchgear operations, protecting sensitive SCADA and relay equipment.
IP65 + full potting — withstands the harsh environmental conditions found in outdoor substations: humidity, dust, temperature extremes, and vibration.
Built-in protections:
- Input undervoltage protection
- Input overvoltage protection
- Overtemperature protection
- Output overcurrent protection
- Short-circuit protection
These comprehensive protections ensure uninterrupted operation and prevent cascading failures in critical power infrastructure.
For power substation automation, reliable DC power conversion is not optional — it is essential for grid safety and stability.
The MDN4000-360S48 combines 4000W high power output, ultra-high voltage input with multiple range options, dual electrical isolation, IP65 protection, 93% high efficiency, and CAN communication into a rugged DC-DC solution purpose-built for the demanding conditions of power substation automation.
For more details, custom input range options, or to request a sample, contact our engineering team.
