Premium CVS-280 SERIES DC/DC Converter
The Premium CVS-280 is a compact 280 W DC/DC converter developed for rail and transportation environments where stable, galvanically isolated auxiliary power is required from high-voltage traction supplies. Designed to operate from 600 / 750 VDC catenary systems and compliant with EN50155:2017, EN50163 and EN50124-2, it delivers dependable perfo...
Read MoreThe Premium CVS-280 is a compact 280 W DC/DC converter developed for rail and transportation environments where stable, galvanically isolated auxiliary power is required from high-voltage traction supplies. Designed to operate from 600 / 750 VDC catenary systems and compliant with EN50155:2017, EN50163 and EN50124-2, it delivers dependable performance in rolling stock, onboard control electronics and vehicle auxiliary systems.
With its fully isolated architecture providing 7 kVrms input-to-output separation, the CVS-280 supports high-voltage installation scenarios while maintaining safe, low-noise DC output. Available in 24 V, 48 V, 72 V and 110 V variants, the converter maintains tight voltage regulation within ±1 percent and supplies continuous 280 W output power, with short-duration peak capability up to 400 W for loads with transient demands. Natural convection cooling and wide -40 to +70 °C operating range allow integration into sealed cabinets or thermally constrained vehicle compartments without forced-air requirements.
The converter includes an ORing diode for redundancy applications, allowing parallel operation with external batteries or backup supplies. Input protection features—such as current limiting, reverse polarity protection and under-voltage lockout—ensure resilience in fluctuating traction environments, while overload and short-circuit behaviour is controlled through an internal current-limiting circuit. Status outputs and an isolated alarm relay provide clear voltage-health feedback to onboard monitoring systems.
Weighing only 1.75 kg and housed in a compact 65 × 162 × 230 mm enclosure, the CVS-280 is engineered for long-term reliability with a 20-year service life and MTBF of 200,000 hours at 40 °C. Compliance with EN61373 shock and vibration requirements confirms suitability for body-mounted railway equipment where mechanical endurance is essential.
Powerbox Australia supports the full CVS-280 range locally, providing engineering guidance, product selection support and access to stocked units for Australian rail operators, OEMs and integrators. The CVS-280 offers a reliable, rail-ready way to convert high-voltage catenary power into stable low-voltage DC for control, signalling and auxiliary systems across diverse rolling stock applications.
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Features
- Wide high-voltage catenary input range for rail environments - Designed to operate from 600 / 750 VDC traction systems with tolerance from 400 to 1100 VDC, the CVS-280 is built to handle voltage fluctuations, dips and surge conditions associated with rolling stock power networks.
- High isolation architecture for safety-critical rail applications - The converter provides 7 kVrms galvanic isolation between input and output, with additional isolation to earth, meeting EN50124-1 insulation coordination requirements for safe operation in high-energy onboard environments.
- Stable low-voltage output with tight regulation - Available in 24, 48, 72 and 110 V models, the CVS-280 maintains tight voltage regulation within ±1 percent, ensuring clean, reliable power for control systems, signalling devices, communication electronics and auxiliary loads.
- Robust protection suite for long-term reliability - Integrated protection includes current limiting for overload and short-circuits, reverse polarity protection, under-voltage lockout, input fuse protection and automatic thermal shutdown at high internal temperatures.
- Natural convection cooling for sealed or space-restricted cabinets - The converter delivers full output power from -40 to +70 °C without forced airflow, making it suitable for enclosed compartments, driver consoles, electrical cabinets and environments with limited ventilation.
- Long lifecycle construction with railway-grade mechanical resilience - With a 20-year service design life, an MTBF of 200,000 hours at 40 °C and EN61373 Category 1 Class B shock and vibration compliance, the CVS-280 is engineered to withstand the mechanical demands of rolling stock installations.
Specifications
| INPUT | |
|---|---|
| Nominal DC input voltage | 600 / 750 V according to EN50163:2006 and EN50124-2:2017 |
| Minimum DC input voltage | 400 V |
| Maximum DC input voltage | 1100 V continuous 3 kV falling to 1.5 kV for 20 ms, 4.5 kV falling to 2.25 kV for 1 ms |
| Maximum input ripple | 75 Vpp from 50 to 360Hz |
| Maximum input current | 0.84 A |
| Input consumption at no load | ≤ 7 W @ 600 Vin , ≤ 9 W @ 750 Vin |
| Input undervoltage shutdown | 45 % to 55 % Vi nom |
| OUTPUT | |
|---|---|
| Output voltage | See model selection table |
| Voltage tolerance | ≤ ±1 % |
| Maximum peak current (Iopk) time | 500 ms |
| Total regulation | < ±1 % |
| Ripple | < 100 mVpp at Ta >0°C < 240 mVpp at Ta -40°C |
| Ripple + noise (BW 20 MHz) | ≤ 1% of nominal output voltage |
| Maximum continuous power | 280 W |
| Peak power | 400 W |
| ENVIRONMENTAL | |
|---|---|
| Storage temperature | -40 … 85 °C |
| Operating temperature range at Io= 100% | -40 … 70 °C |
| Operating temperature range at Io= 62.5% | -40 … 85 °C |
| Cooling | Natural convection |
| Operating altitude | 2500 m |
| Maximum Relative humidity | 95 % with no condensation |
| Shock and vibration | EN61373:2010 Category 1 class B body mounted |
| Service life | > 20 years |
| MTBF | 200.000 h @ 40 °C according to IEC61709 |
| EMC | |
|---|---|
| Emission | EN50121-3-2:2016 |
| Immunity | EN50121-3-2:2016 |
| SAFETY | |
|---|---|
| Safety according to norm | EN50124-1:2017 Railway app. (Insulation coordination) |
| Dielectric strength Input / Output | 7000 Vac 50 Hz 10 s |
| Dielectric strength Input / Earth | 5300 Vac 50 Hz 10 s |
| Dielectric strength Output / Earth | 1800 Vac 50 Hz 1 min |
| Protection Degree | IP20 |
| Fire and smoke | EN45545-2:2013 +A1:2015 |
| MECHANICAL | |
|---|---|
| Dimensions | 65 x 162 x 230 mm |
| Weight | 1750 g |
| CONTROL | |
|---|---|
| Low output voltage alarm | Threshold: 0.9 … 0.95 Vo nom. Isolated solid state relay open when alarm. Maximum rating contact capacity 100 mA and 160 V (closed < 8 Ω) |
| Remote inhibit input | Inhibit voltage range: Nominal Output Voltage ± 40 % |
| PROTECTIONS | |
|---|---|
| Against output overloads and short-circuits | Current limiting |
| Against reverse input voltage | By input diode in serial connection |
| Against input under-voltage | Under-voltage lock-out. See Note 2 |
| Against Input over-currents | Input fuse |
| Against Overtemperature | Shutdown when internal temperature rises 120 ºC |
| Others | PCB conformal coated with acrylic varnish |
| Note-1: Do not handle the connection terminals below -25°C Note-2: In case of lock-out, a pulse of inhibit signal is needed to reset the converter (minimum 100ms); or remove the input supply voltage for at least 3 seconds. |
|
Selection Table
| MODEL SELECTION | ||||||||
|---|---|---|---|---|---|---|---|---|
| Nominal input voltages [V] | Input Voltage Range [V] |
Nominal output voltage [V] | Max Output Current [A] |
Max Output Power [W] |
Output Peak Current [A] |
Output Peak Power [W] |
Efficiency @750Vin [%] |
|
| CVS-280-6973 | 600 / 750 | 400 - 1100 | 24 | 11.6 | 280 | 16.6 | 400 | 88 |
| CVS-280-6975 | 600 / 750 | 400 - 1100 | 48 | 5.8 | 280 | 8.3 | 400 | 88 |
| CVS-280-6976 | 600 / 750 | 400 - 1100 | 72 | 3.8 | 280 | 5.67 | 400 | 89 |
| CVS-280-6977 | 600 / 750 | 400 - 1100 | 110 | 2.5 | 280 | 3.64 | 400 | 89.5 |
Technical Drawings
Warranty & Returns
Warranty periods vary by product. Please refer to the Powerbox Warranty Policy for the applicable coverage period against manufacturing defects from date of purchase. For returns and RMA requests, please visit our RMA support page or contact our support team directly.