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AC Filter Capacitors for Harsh Environments

Designed for harsh environments, Cornell Dubilier’s new ALH series of AC rated filter capacitors offer 50% greater life than competitive 85/85 THB-rated film capacitors.

  • 1,500-hour rating is 50% greater than competitors’ series.
  • Optimized AC Voltage performance
  • THB 85 °C / 85 % RH, 1500h at rated voltage
  • Harmonic filtering on the input and output of inverter circuits
  • Self-healing and low loss
  • Suitable for high-frequency applications
  • UL Listed, AEC-Q200 Qualified
Why Choose Cornell Dubiler's Harsh Environment AC Filter Capacitors?

The Temperature, Humidity at Bias (THB) test exposes parts to the harsh conditions of 85 °C at 85% relative humidity with rated voltage applied.

CDE’s testing has been validated for 1,500 hours while competitors validate their series for 1,000 hours under the same conditions. This demanding test simulates the extremely harsh operating conditions encountered in many commercial and industrial inverter applications that can cause conventional film capacitors to fail early due to moisture penetration.

ALH Series

The ALH Series is optimized for AC harmonic filtering on the input and output of inverter circuits.

Capacitance ranges from 0.22 to 50 μF at 160-450 Vac, 50/60Hz with high rms current ratings for handling higher-ordered harmonics.

The series offers self-healing, metalized polypropylene-film in a robust board-mount package that also meets the rigors of automotive AEC Q200 testing.

The solvent-resistant, box-style plastic case and resin-seal are both UL/cUL 94V-0 recognized for construction designs, with tin-plated copper RoHS compliant terminations.

Their superior construction makes these capacitors ideally suited for solar, wind, UPS, EV, and other inverters applications that may be subjected to wide-ranging environmental conditions.

The ALH Series film capacitors are available now from the Distributed Micro Technology, one of Cornell Dubilier's franchised distributors.

Applications Include
  • Solar
  • EV
  • Other inverters that are subjected to the harshest natural environmental conditions
  • Backup UPS
  • Portable power systems
  • Motor drives
  • Traction and other transportation systems
  • AC-tuned harmonic reduction filters
A Little about CDE & DMTL

Based in Liberty, SC, Cornell Dubilier specialize in Snap-in Aluminium Electrolytic, AC Power Film Capacitors, DC Film Capacitors, IGBT Snubbers and Mica Capacitors. 

Cornell Dubilier focus their engineering capabilities towards advancing Aluminium electrolytic technology, especially in the area of prismatic form factors.  Thermal and physical modelling of capacitors using COMSOL and advanced electrical and physical testing and analysis techniques. 

Cornell Dubilier consider their key strengths to be their broad portfolio of standard capacitor products for Power Electronics.  They excel with applications and custom capacitor designs for critical applications.  Their access to CDE engineers, their global logistics, sales and distribution network all lend support to a customer’s decision to approve a CDE Device.

DMTL were appointed Cornell Dubilier (CDE) UK Design Distributors in 2015.

To date designs have included Hi Capacitance Aluminium, Low ESR devices, High Voltage Radials and most recently the Silver Mica Hi Rel Cap ranges.