DC/DC Converters

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 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 Illustrations

Premium_CVS-280_DC_DC_Converter_Drawing_01

Premium_CVS-280_DC_DC_Converter_Drawing_02

Premium_CVS-280_DC_DC_Converter_Drawing_03

Downloads

CVS-280_Datasheet.pdf

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.

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

CVS-280_Datasheet.pdf

Find the Right Model

Model Number	Input Voltage (Vdc)	Output Voltage (Vdc)	Output Current (A)
CVS-280-6973	600 / 750Vdc (Nominal)	24Vdc	11.6A	Powerbox Website Product Enquiry Fill out the form below and one of our Powerbox specialists will be in contact with you shortly. First Name Last Name Phone Email Company Name Country State NSW VIC QLD SA WA NT ACT TAS Not applicable Please indicate the nature of your product enquiry: (You may select more than one) Pricing & Availability Technical Support / Application Guidance Product Documentation Other Industry Product you're enquiring about Product Model Need assistance CVS-280-6973 CVS-280-6975 CVS-280-6976 CVS-280-6977 Message (optional) Enquire Now
CVS-280-6975	600 / 750Vdc (Nominal)	48Vdc	5.8A	Powerbox Website Product Enquiry Fill out the form below and one of our Powerbox specialists will be in contact with you shortly. First Name Last Name Phone Email Company Name Country State NSW VIC QLD SA WA NT ACT TAS Not applicable Please indicate the nature of your product enquiry: (You may select more than one) Pricing & Availability Technical Support / Application Guidance Product Documentation Other Industry Product you're enquiring about Product Model Need assistance CVS-280-6973 CVS-280-6975 CVS-280-6976 CVS-280-6977 Message (optional) Enquire Now
CVS-280-6976	600 / 750Vdc (Nominal)	72Vdc	3.8A	Powerbox Website Product Enquiry Fill out the form below and one of our Powerbox specialists will be in contact with you shortly. First Name Last Name Phone Email Company Name Country State NSW VIC QLD SA WA NT ACT TAS Not applicable Please indicate the nature of your product enquiry: (You may select more than one) Pricing & Availability Technical Support / Application Guidance Product Documentation Other Industry Product you're enquiring about Product Model Need assistance CVS-280-6973 CVS-280-6975 CVS-280-6976 CVS-280-6977 Message (optional) Enquire Now
CVS-280-6977	600 / 750Vdc (Nominal)	110Vdc	2.5A	Powerbox Website Product Enquiry Fill out the form below and one of our Powerbox specialists will be in contact with you shortly. First Name Last Name Phone Email Company Name Country State NSW VIC QLD SA WA NT ACT TAS Not applicable Please indicate the nature of your product enquiry: (You may select more than one) Pricing & Availability Technical Support / Application Guidance Product Documentation Other Industry Product you're enquiring about Product Model Need assistance CVS-280-6973 CVS-280-6975 CVS-280-6976 CVS-280-6977 Message (optional) Enquire Now

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Premium CVS-280 SERIES DC/DC Converter

Features

Find the Right Model

Powerbox Website Product Enquiry

Powerbox Website Product Enquiry

Powerbox Website Product Enquiry

Powerbox Website Product Enquiry

Need help finding the right product model?

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