Hurtle Webster Pty Ltd
+61 407 335 765 sales@hurtlewebster.com

Rheostats

  • Linear & Tapered Windings
  • Ganged Units
  • Special Tolerances
  • Non-Preferred Resistance Values Available

Resistance stability is maintained throughout operating temperature range by the exclusive use of resistance wires having a temperature co-efficient of 20ppm or better, for the resistance values falling within the standard range per type. Wires with particular temperature co-efficient characteristics can be used to supply customer special design requirements. Resistance values over or under those shown may be available upon request.

TYPE RA 20WATT

10Ω to 50KΩ. 10% tolerance
  • Operating Temperature
    Less than 100°C at an ambient of 25°C and with load dissipated over full winding
  • Spindle
    6.5mm diameter. Aluminium. Standard length 19mm - 290°C rotation
  • Mounting
    8mm diameter. Bush. 26 turns per inch. Locating lug. Knob and nuts supplied. Weight 80g
  • Design
    Low T/C wire wound on Normex former and fixed into Bakelite housing. Nylon tipped wiper arm pressing in phosphor-bronze contact ring virtually eliminates wear on fine resistance wires. Spindle to element resistance 100MΩ at 100V minimum

TYPE RB 80WATT

7.5Ω to 10KΩ. 10% tolerance
  • Operating Temperature
    Less than 100°C at an ambient of 25°C and with load dissipated over full winding
  • Spindle
    6.5mm diameter. Aluminium. Standard length 19mm - 315° rotation
  • Mounting
    Two 21.5mm holes through ceramic body. Panel hole for bush 6.5mm diameter. Knob and bolts supplied. Weight 350g
  • Design
    Low T/C wire precision wound no heat resistant Normex and embedded into ceramic housing for maximum heat dispersion. Spindle to element resistance 100MΩ at 100V minimum

TYPE RC 200WATT

5Ω to 20KΩ. 10% tolerance
  • Operating Temperature
    Less than 110°C at an ambient of 25°C and with load dissipated over full winding. Ganged pairs rating is approximately 75% that of single units
  • Spindle
    6.5mm diameter. Steel. Standard length 32mm - 300°C rotation
  • Mounting
    Via two 5mm diameter holes in ceramic body. Knob and screws supplied. Weight 800g
  • Ganging
    By means of three holes in outer rim. Achieving a greater range of W/U characteristics or simultaneous multiple control
  • Design
    Low T/C wire wound on Normex embedded into cast aluminium housing. Spindle to element resistance 100MΩ at 100V minimum

TYPE RD 400WATT

10Ω to 20KΩ. 10% tolerance
  • Operating Temperature
    Less than 110°C at an ambient of 25°C and with load dissipated over full winding. Ganged pairs rating is approximately 75% that of single units
  • Spindle
    6.5mm diameter Steel. Standard length 32mm - 300°C rotation
  • Mounting
    Via two 5mm diameter holes in central body. Knob and screws supplied. Weight 1kg
  • Design
    Low T/C wire wound on Normex embedded into die cast aluminium housing. Maximum dispersion of heat away from resistance element. Nickle silver tipped wiper arm. Spindle to element resistance 100MΩ at 100V minimum

TYPE RE 70WATT

0.2Ω to 1.5Ω. 10% tolerance
  • Operating Temperature
    Less than 200°C with continuous use at an ambient of 25°C and with load dissipated over full winding
  • Spindle
    6.5mm diameter. Steel. Standard length 5/8" - 300°C rotation
  • Mounting
    Via two spacers tapped 3.5mm in diameter. Knob and screws supplied. Weight 250g
  • Design
    The resistance element consists of open coil laced around a ceramic housing. Featuring an end stop shorting bar ideal for low resistance high wattage use