EAK DISCHARGE RESISTOR – Product Specification Overview

 

The EAK Discharge Resistor is a high-performance resistor designed for specialized applications, particularly in environments requiring stable resistance under challenging conditions. This document provides a detailed overview of the product's specifications, features, and usage guidelines based on its technical documentation.

1. Technical Specifications

1.1 Resistance Value

The EAK Discharge Resistor offers a linear resistance range from 0.04 Ω to 100 Ω , with a tolerance of ±10% . The resistance value can be customized further depending on the diameter, allowing flexibility in design and application requirements.

1.2 Dimensions

Available in multiple sizes, the resistor’s dimensions are defined by outer diameter (ranging from 48 mm to 151 mm ), inner diameter (with variations such as 16/20 mm, 26 mm, 34 mm, or 41 mm ), and thickness (10 mm to 25.3 mm ). These dimensional options provide adaptability for different mounting and installation needs.

1.3 Rated Power & Thermal Characteristics

  • Rated Power: 22W at 25°C.
  • Maximum Temperature Rise: ≤ 220K.
  • Temperature Coefficient of Resistance (TCR): -0.08 to -0.03%/°C, indicating stable resistance over temperature changes.
  • Thermal Conductivity: 1.22 W/m·K, ensuring efficient heat dissipation.
  • Specific Heat Capacity: 745 J/(kg·K), contributing to thermal stability during operation.
  • Operating Temperature Range: -40°C to 125°C.
  • Maximum Operating Temperature: Up to 220°C.
  • Storage Temperature Range: -55°C to 80°C.

1.4 Electrical Performance

  • Insulation Resistance: ≥ 2000 MΩ at DC 1000V.
  • Impulse Test Capability: Withstands lightning impulse waveform 1.2/50 μs , with peak voltage ranging from 20.5 kV (for diameters ≤50 mm) to 23.5 kV (for larger diameters) . After two impacts and cooling to room temperature, resistance change remains within ±3%.

1.5 Mechanical & Physical Properties

  • Density: 2.2–2.4 g/cm³.
  • Thermal Expansion Coefficient: 4.5–6 x 10⁻⁶ /°C.
  • Shock Energy Density:
    • 500 J/cm³ in air.
    • 600 J/cm³ in SF₆ gas environment.
  • Installation Torque:
    • Standard: 15–25 Nm .
    • Maximum:
      • 25 Nm for 10 mm thickness .
      • 35 Nm for 25 mm thickness .
  • Flatness Tolerance:
    • Finished Product: ≤ 5丝 (0.05 mm).
    • Blank Disc: ≤ 1丝 (0.01 mm).

1.6 Long-Term Stability

  • Resistance Deviation During Storage: Within ±3% after 6 months under normal storage conditions.
  • Resistance Stability Under Temperature Variation: ±3% of nominal value across a temperature range of -50°C to 55°C , measured every 10°C.

2. Usage Guidelines

2.1 Installation

Proper installation requires applying torque according to thickness:

  • 12–15 Nm for single-disc installations.
  • Up to 25 Nm for 10 mm thickness .
  • Up to 35 Nm for 25 mm thickness .

2.2 Operational Considerations

  • Not suitable for continuous pulse applications due to small surface area limiting heat dissipation.
  • For frequent intermittent pulse operations , it is recommended to incorporate heat sinks, air cooling, water cooling, or other auxiliary cooling systems to maintain optimal operating temperatures.

2.3 Environmental Conditions

  • Location: Indoor or enclosed cabinet.
  • Relative Humidity: ≤90% RH.
  • Altitude: ≤2500 meters.
  • Pressure Range: 86 kPa to 106 kPa.

3. Packaging & Storage

3.1 Identification

Each unit is marked with:

  • Manufacturer’s initials.
  • Model and specification.
  • Batch number.

These markings remain legible and durable after standard testing procedures.

3.2 Packaging Options

  • Small quantities: Individually bagged with corrugated cardboard protection.
  • Bulk orders: Packed in wooden crates for secure transport.

3.3 Storage Environment

  • Corrosion-free atmosphere.
  • No exposure to rainwater during transportation.
  • For long-term storage: Pre-use drying at 100–130°C for 8 hours or more is recommended to ensure performance integrity.

4. Key Insights & Applications

The EAK Discharge Resistor is engineered for applications where high impulse withstand capability , stable resistance under varying temperatures , and compact design are critical. Its characteristics make it ideal for use in:

  • Power electronics.
  • High-voltage switching systems.
  • Industrial equipment requiring discharge resistors.
  • Applications involving transient voltage suppression.

Its ability to function effectively in extreme environmental conditions—from sub-zero to high-temperature environments—ensures reliability in mission-critical systems.

Conclusion

The EAK Discharge Resistor stands out for its robust construction, excellent electrical performance, and adaptability to diverse operational demands. Whether used in industrial control systems, power conversion units, or high-voltage discharge applications, this resistor offers consistent performance backed by rigorous technical standards. Proper installation, maintenance, and adherence to storage guidelines will ensure optimal service life and functionality.

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