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WLRH Series

WLRH Series

Product catalog summary
Characteristics and Applications
The WLRH series Heliohm Wirewound resistors are robust and versatile, suitable for applications such as motor starting, speed control, neutral grounding, lighting ballasts, AC compressor buffers, and heating. The series offers 45 models with resistance values ranging from 0.25 to 250 Ohms.

Construction and Materials
These resistors feature wire made of nickel-copper, nickel-chrome, or stainless steel, wound in a double helix around a ceramic core with a spiral groove. The terminals are made of corrosion-resistant stainless steel.

Options and Customization
Custom resistance values, frames, screened enclosures, heat shields, and packages are available upon request.

Specifications
  • Current Rating: 1.0 - 32.0 Amps continuous
  • Wattage Rating: Calculated using I2R, allowing a 375°C temperature rise
  • Working Voltage: Up to 600 volts maximum to ground
  • Resistance Tolerance: ±10%
  • Ohmic Values: Listed values are at 25°C ±10%
  • Mounting: Various options available

Standard Resistance Values
The document provides a detailed table of part numbers, resistance values, and continuous amp ratings for each model, ranging from 0.25 Ohms with a 32 Amp rating to 250 Ohms with a 1 Amp rating.
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Catalog excerpts

WLRH Series-1

The WLRH is a tough, versatile resistor appropriate for the following applications: motor starting and speed control, neutral grounding, lighting ballasts, and A.C. compressor buffers. This resistor can also be used in heating applications. Choose from 45 models ranging from 0.25 to 250 Ohms to best fit your specific requirements. Resistors feature nickel-copper, nickel-chrome or stainless steel wire wound in a double helix around the center core, depending on size and model. All have ceramic cores with a spiral groove to grip the coiled wire. The 90° flat bus style terminals are corrosion resistant stainless steel. Other mounting options are available; contact us about your specific requirements. OPTIONS Inquires are welcome regarding special resistance values, frames, screened enclosures, heat shields and packages. CHARACTERISTICS Current Rating 1.0 - 32.0 Amps continuous Wattage Rating Wattages can be calculated using I2R from the data in the standard resistance value table. These are maximums for continuous duty allowing a 375°C temperature rise. Working Voltage Standard is 600 volts maximum to ground Resistance Tolerance ±10% Ohmic Values Ohmic values listed in the table are at 25°C ±10% Mounting Resistors can be mounted in various options NFORMATION Standard Resistance Values Number Ohms Rating Number Ohms Rating Number Ohms Rating Part Number Cont. Amp Ohms Rating 1-866-9-OHMITE • Int’l 1-847-258-0300 • Fax 1-847-574-7522 • www.ohmite.com • [email protected]

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