Vishay DCRF series direct water cooled wirewound resistors

Vishay Intertechnology introduces a new series of direct water cooled wirewound resistors that offers ultra high
power dissipation to 9000 W without external radiation. Available in six compact sizes ranging from 38 mm by 178
mm to 38 mm by 410 mm, Vishay MCB DCRF series devices are designed to save space and increase reliability
over standard wirewound resistors.

• Handle ten times the power of natural cooled devices in the same size, and two times the power of indirect water cooled devices
• Replace multiple components with one resistor
  • Lower costs
  • Simplify layouts
  • Reduce the size of end products
• Resistive elements are in direct contact with water and insulated by ceramic tubes, eliminating the need for a heatsink
• With no external radiation, the resistors increase reliability by limiting the surface temperature

Features

• Ultra high power dissipation to 9000 W without external radiation
• Available in six compact sizes ranging from 38 mm by 178 mm to 38 mm by 410 mm
• Modular structure enables a multi-resistive element option
• Safe failure mode prevents leakage in the event of a water flow shut down
• Direct cooling without heatsink
• Can handle an overload of 2xPn for 60 s without damage
• Low inductance
• Resistance range from 0.56 Ω to 27 Ω, with tolerances down to ± 5 %
• Water inlet temperature of 65 °C and 8.33 l/min flow rate (deionized water with conductivity < 2 µS/cm)
• RoHS-compliant and lead (Pb)-free
• Typical temperature coefficient of 100 ppm/°C
• Operate over a temperature range of -55 °C to +120 °C

Applications

• Load
• Filter
• Snubber
• Discharge resistors in large drives
• HVDC
• Battery management systems for industrial applications