Kaiert DC Rated Fuses: KD & KHD High-Speed Circuit Protection

Kaiert Fuses provide superior high-speed circuit protection for modern DC power systems. Engineered to interrupt high-energy faults in solar PV arrays, electric vehicle charging infrastructure, and industrial rectifiers, these components ensure the safety of valuable power electronics assets.

Product Overview

The Kaiert DC Rated series features a full spectrum of mechanical formats, including cylindrical (KD), blade/knife-type (KHD), and flat/bolt-on (KPD) designs. Utilizing 99.99% pure silver elements and high-grade silica sand quenching media, these fuses offer exceptional I²t clearing characteristics and arc suppression capabilities optimized for high L/R time constants.

Typical Applications

  • Renewable Energy: Photovoltaic (PV) combiner boxes and central inverter protection.
  • Industrial Power: Rectifiers, VFD DC bus protection, and UPS battery systems.
  • Electric Transportation: EV charging stations and DC traction substations.
  • Energy Storage: Large-scale Battery Energy Storage Systems (BESS).

Key Features & Benefits

  • High Breaking Capacity: Rated for up to 100kA to handle massive short-circuit currents.
  • Visual Indication: Options for striker pins (mechanical indication) for automated fault sensing.
  • Global Compliance: Manufactured to GB13539, IEC 60269-4, and VDE 0636 standards.
  • Thermal Stability: Low power loss construction reduces cabinet heat gain.

Selection Guide: KD Cylindrical Series

KD14 Series — 440V DC

$\Phi$14×51mm • 10A to 40A • 30kA Breaking Capacity

Catalog Number (No Striker / Striker) Voltage Rating Class Action
KD14-10A/440V
KD14-K-10A/440V		 440V 10A gR/aR REQUEST QUOTE
KD14-16A/440V
KD14-K-16A/440V		 440V 16A gR/aR REQUEST QUOTE
KD14-25A/440V
KD14-K-25A/440V		 440V 25A gR/aR REQUEST QUOTE
KD14-32A/440V
KD14-K-32A/440V		 440V 32A gR/aR REQUEST QUOTE
KD14-40A/440V
KD14-K-40A/440V		 440V 40A gR/aR REQUEST QUOTE

KD22 Series — 440V DC

$\Phi$22×58mm • 25A to 100A • 30kA Breaking Capacity

Catalog Number (No Striker / Striker) Voltage Rating Class Action
KD22-25A/440V
KD22-K-25A/440V		 440V 25A gR/aR REQUEST QUOTE
KD22-50A/440V
KD22-K-50A/440V		 440V 50A gR/aR REQUEST QUOTE
KD22-100A/440V
KD22-K-100A/440V		 440V 100A gR/aR REQUEST QUOTE

→ Continued: KHD Blade and KPD Flat Bolt-on Series Tables

Heavy Duty Series: KHD Blade & KPD Bolt-On

KHD Blade Type Series (Size 00 to 3)

750V / 1000V DC • 20A to 900A • High-Speed aR

Catalog Number Size Rating Voltage Action
KHD0-100A/750V DC 0 100A 750V REQUEST QUOTE
KHD1-250A/750V DC 1 250A 750V REQUEST QUOTE
KHD2-500A/1000V DC 2 500A 1000V REQUEST QUOTE
KHD3-900A/1000V DC 3 900A 1000V REQUEST QUOTE

KPD Flat Bolt-on Series (Size 1 to 6)

750V to 1000V DC • 50A to 2000A • 100kA Breaking Capacity

Catalog Number Size Rating VDC Action
KPD1-250A/750V DC 1 250A 750V REQUEST QUOTE
KPD2-500A/750V DC 2 500A 750V REQUEST QUOTE
KPD4-1000A/1000V DC 4 1000A 1000V REQUEST QUOTE
KPD6-2000A/750V DC 6 2000A 750V REQUEST QUOTE
Primary Standards: IEC 60269-4, GB13539.4, VDE 0636-40  |  Protection Class: aR (High Speed / Partial Range) / gR (Full Range)  |  Interrupting Rating: Up to 100kA DC

Need specialized DC fuse holders or technical assistance with Kaiert L/R time constant selection? Contact our application engineers for a custom solution.

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