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WHR Foil Resistors

Product catalog summary

Overview: The document provides detailed specifications and characteristics of WHR Precision Shunt Resistors, manufactured by SHENZHEN KWX ELECTRONICS CO., LTD. These resistors are designed for high precision applications with a focus on low resistance, high power rating, and minimal inductance.

Specifications:

Resistance Range: 0.001 Ohm to 100 Ohms
Power Rating: Up to 50 Watts
Resistance Tolerances: As low as ±0.1%
Temperature Coefficient of Resistance (TCR): As low as ±10ppm/K
Inductance: Very low, suitable for precision applications

Types and Models: The document lists various models such as WHR 2-3025, WHR 2-3818, WHR 4-3825, and WHR 4-4618, each with specific dimensions and characteristics.

Thermal and Electrical Characteristics:

Thermal Resistance: Ranges from 1.6 K/W to 2.0 K/W depending on the model
Operating Temperature Range: -40 to 130℃
Voltage Proof: Up to 500 VDC
Thermal EMF: Less than 0.1µV/K

Material Composition:

Resistor Material: CuNiMn-Foil
Substrate: Anodized aluminum
Housing: Epoxy
Connector Material: Cu tinned

Design and Dimensions: The document includes detailed dimensional drawings for various models, specifying measurements in both millimeters and inches with tolerances.

Performance and Stability: The resistors are designed to maintain stability under various stress conditions, with specific TCR values provided for different resistance ranges.

Installation Notes: The FHR series resistors require attachment to a suitable heat-sink to maintain optimal performance, with a maximum internal temperature of 130℃. A formula is provided to calculate the appropriate heat-sink thermal resistance.

Catalog excerpts

0 Feature -Resistance from 0.001 Ohm to 100 Ohms -Power Rating to 50 Watts -Resistance Tolerances to ±0.1% -TCR to ±10ppm/K -Very Low Inductance

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