DC/DC Converters

Premium CRS-60 Series DC/DC Converter

The Premium CRS-60 Series are railway-grade PWM DC/DC converters providing 50–60W of isolated power conversion across five nominal input voltages (12, 24, 48, 72 and 110Vdc) and four output voltages (5, 12, 24 and 48Vdc). Designed and certified to EN 50155 for rolling stock applications, the series is built for demanding railway and industrial e...

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The Premium CRS-60 Series are railway-grade PWM DC/DC converters providing 50–60W of isolated power conversion across five nominal input voltages (12, 24, 48, 72 and 110Vdc) and four output voltages (5, 12, 24 and 48Vdc). Designed and certified to EN 50155 for rolling stock applications, the series is built for demanding railway and industrial environments where supply integrity is critical.

Three models in the series have earned Queensland Rail (QR) Type Approval: the CRS-60-6736 (24Vdc in / 12Vdc out), CRS-60-6740 (48Vdc in / 12Vdc out) and CRS-60-6741 (48Vdc in / 24Vdc out). These models are prequalified for use on Queensland Rail infrastructure.

All models feature galvanic isolation up to 3,000Vac between input and output, a push-pull converter topology operating at a fixed switching frequency, and output voltage adjustment via a trimpot (−10% to +15% of nominal; −10% to +25% for 12Vdc output models). Remote sensing compensates for cable voltage drop up to 0.3V per pole, and an output voltage presence LED provides immediate status indication.

The series protects against overloads and short circuits via current limiting, reverse input polarity via an input fuse, and input undervoltage via an undervoltage lockout circuit. Units can be chassis mounted using four fixing holes or DIN rail mounted using the optional NP-9135 clip accessory. For redundancy applications, the ACD-15 accessory provides ORing diode and alarm contact functions for two-unit parallel operation.

MTBF is rated at 650,000 hours at 40°C per IEC 61709. Manufacturer: Premium S.A. (Spain), ISO 9001 and ISO 14001 certified.

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Premium CRS-60 Series DC/DC Converter by Premium S.A.
Features
  • Galvanic isolation up to 3,000Vac between input and output protects sensitive downstream electronics from supply-side transients, ground loops, and fault voltages — a critical requirement in railway and industrial environments where high-voltage disturbances on the DC bus are common.
  • Output voltage is field-adjustable from −10% to +15% of nominal (−10% to +25% on 12Vdc output models), allowing system integrators to fine-tune the output to compensate for cable losses or meet exact load requirements without additional regulation components.
  • Remote sensing terminals compensate for resistive voltage drop across supply cables — up to 0.3V per pole — ensuring precise voltage delivery at the load regardless of cable length or current draw. Ideal for distributed loads where cable runs are significant.
  • Undervoltage lockout prevents operation below the minimum rated input, protecting connected loads from undervoltage conditions and preventing battery deep-discharge in battery-backed systems. Reverse polarity protection via input fuse guards against incorrect wiring during installation.
  • Three models — CRS-60-6736 (24Vdc in / 12Vdc out), CRS-60-6740 (48Vdc in / 12Vdc out) and CRS-60-6741 (48Vdc in / 24Vdc out) — hold Queensland Rail (QR) type approval, making them prequalified for use on QR rolling stock and infrastructure projects.
  • Rated at 650,000 hours MTBF at 40°C per IEC 61709, with convection cooling and no moving parts, the CRS-60 Series is designed for long-life, maintenance-free operation in sealed enclosures and space-constrained applications where forced-air cooling is impractical.
Specifications
INPUT
Voltage range See selection table
Max allowed input ripple 5% Vin nom (Vrms at 100Hz)
OUTPUT
Output voltage adjustment range: -10 % ... +15 % Vo nom -10 % ... +25 % Vo nom for 12out models
Line regulation (Io = nom) < 0,2 %
Load regulation (Vin = nom) < 0,2 %
Ripple < 50 mVpp
Noise (BW = 20MHz) < 100 mVpp
Maximum remote sensing 0,3V / pole
ENVIRONMENTAL
StorageTemperature -40°C ... 85°C
Operating temperature at Io = 100% -25°C ... 60°C (-40°C ... 60°C, see note-1)
Operating temperature at o = 50% -25ºC … 80ºC (-40°C … 80°C, see note-1)
Maximum Relative humidity 95% with no condensation
MTBF 650.000h @ 40°C according to IEC61709
EMC
Emission EN61000-6-3
Immunity EN61000-6-2
SAFETY
Safety EN60950-1, EN62368-1
Dielectric strength Input/Output 3000Vac, 4200Vdc 1min
Dielectric strength Input / Earth 1500Vac, 2100Vdc 1min
Dielectric strength Output / Earth 1500Vac, 2100Vdc 1min
MECHANICAL
Approximate weight 500g
Dimensions 127 x 84.5 x 40mm
CONTROL
Remote inhibit range 5V ... 24V
PROTECTIONS
Against overloads and short-circuits Current limiting
Against reverse input voltage Input fuse
Against input under-voltage Under-voltage lock-out
Against Input over-currents Input fuse
Selection Table
PART NUMBER POWER (W) INPUT (V) INPUT RANGE (V) OUTPUT (V) OUTPUT CURRENT (A) EFFICIENCY(%)
CRS-60-6731 50 12 9,5 - 15 5 10 77
CRS-60-6732 60 12 9,5 - 15 12 5 78
CRS-60-6733 60 12 9,5 - 15 24 2,5 80
CRS-60-6734 60 12 9,5 - 15 48 1,25 82
CRS-60-6735 50 24 18 - 30 5 10 78
CRS-60-6736 60 24 18 - 30 12 5 83
CRS-60-6737 60 24 18 - 30 24 2,5 84
CRS-60-6738 60 24 18 - 30 48 1,25 85
CRS-60-6739 50 48 36 - 60 5 10 85
CRS-60-6740 60 48 36 - 60 12 5 79
CRS-60-6741 60 48 36 - 60 24 2,5 84
CRS-60-6742 60 48 36 - 60 48 1,25 85
CRS-60-6743 50 72 50,4 - 90 5 10 85
CRS-60-6744 60 72 50,4 - 90 12 5 84
CRS-60-6745 60 72 50,4 - 90 24 2,5 85
CRS-60-6746 60 72 50,4 - 90 48 1,25 85
CRS-60-6747 50 110 77 - 144 5 10 80
CRS-60-6748 60 110 77 - 144 12 5 85
CRS-60-6749 60 110 77 - 144 24 2,5 85
CRS-60-6750 60 110 77 - 144 48 1,25 85
Technical Drawings
Industrial power converter with input fuse, voltage adjust, and LED output indicators, shown with dimensions. Circuit diagram showing isolated power converter with PWM control, input/output terminals, and earth grounding Power converter terminal pinout diagram showing Vin, Vout, Sense, and Earth connections for industrial use Power converter thermal derating graph showing %Wout vs temperature in °C for industrial applications NP-9135 DIN rail clip accessory for industrial power systems with mounting hardware
Downloads
premium-crs-60_PB_v1.1.pdf
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.

FAQs
The CRS-60 Series is available in five nominal input voltages: 12Vdc (9.5–15Vdc range), 24Vdc (18–30Vdc), 48Vdc (36–60Vdc), 72Vdc (50.4–90Vdc), and 110Vdc (77–144Vdc). Select the model whose nominal input voltage matches your system's DC bus — for example, 24Vdc nominal for a 24V battery-backed rail system. Each input group offers four output voltages (5, 12, 24, or 48Vdc), giving 20 models in total. Contact Powerbox at sales@powerbox.com.au if you need guidance on model selection.
Three models in the CRS-60 Series have earned Queensland Rail type approval: CRS-60-6736 (24Vdc in / 12Vdc out, 60W), CRS-60-6740 (48Vdc in / 12Vdc out, 60W), and CRS-60-6741 (48Vdc in / 24Vdc out, 60W). These models are prequalified for use on Queensland Rail rolling stock and infrastructure, simplifying the procurement and approval process for QR projects.
The CRS-60 Series delivers 50W on all 5Vdc output models and 60W on all 12, 24, and 48Vdc output models. Efficiency ranges from 77% (CRS-60-6731, 12Vdc in / 5Vdc out) up to 85% depending on input and output voltage combination — higher input voltages and higher output voltages generally achieve the best efficiency. Full efficiency figures for all 20 models are listed in the product selection table.
The CRS-60 Series is certified to EN 50155 for railway rolling stock applications, EN 60950-1 and EN 62368-1 for safety, EN 61000-6-3 for EMC emissions, and EN 61000-6-2 for EMC immunity. All models carry CE marking under EU Directives 2014/35/EU (Low Voltage), 2014/30/EU (EMC), and 2011/65/EU (RoHS). Three models (CRS-60-6736, CRS-60-6740, CRS-60-6741) also hold Queensland Rail type approval. The product is manufactured by Premium S.A. (Spain), an ISO 9001 and ISO 14001 certified company.
Remote sensing compensates for resistive voltage drop along supply cables by connecting the +Sense and −Sense terminals (terminals 32 and 18) directly at the load rather than at the converter output. The CRS-60 can compensate for up to 0.3V per pole of cable drop, ensuring the load receives the correct regulated voltage regardless of cable length or current draw. Remote sensing is recommended for precision loads or long cable runs; if not required, the sense terminals can be left disconnected. Note: if sense terminals are connected to the load but the output cable connection to that load is missing, the internal protection fuse may activate — always ensure both output and sense connections are made together.
The CRS-60 Series includes four built-in protection functions: current limiting for overload and short-circuit protection; an input fuse for reverse polarity protection (blows on incorrect connection); undervoltage lock-out that disables the converter below the minimum input threshold, preventing battery deep-discharge; and an input fuse for over-current protection. All protections are automatic — no manual reset is required after the fault condition is removed.
The CRS-60 can be chassis mounted using four M4 fixing holes on the unit body, or DIN rail mounted using the optional NP-9135 clip accessory (ordered separately). The unit measures 127 × 84.5 × 40mm and weighs approximately 500g. Connection is via spring clamp terminal strips. For vertical mounting, natural convection provides sufficient cooling; if operating close to maximum output power, ensure adequate airflow around the unit.
Yes, CRS-60 units can be operated in parallel to increase available output current or to provide N+1 redundancy. When paralleling, set all units to the same output voltage (as close as possible), use equal-length output cables with the same cross-section, and do not use remote sensing. The optional ACD-15 accessory provides ORing diodes and alarm contacts for two-unit redundant configurations, cleanly isolating a failed unit and providing a fault signal. Contact Powerbox at sales@powerbox.com.au for guidance on parallel configurations.