HEATERS FOR EVERY APPLICATION
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Cartridge Heaters:  Square and Rectangular
                                   Low to Medium Watt Density

U.L. Recognized  -  E56973           C.S.A. Certified  -   016386-0-000

Features

• The Hotwatt Square and Rectangular Cartridge Heater is designed to distribute
  maximum heat within a desired area. Because they are completely enclosed,
  square units will furnish more usable heat for a given wattage than a comparable
  strip heater attached to the exterior of a mold, platen, or other equipment.
• The units are inserted in a milled slot, permitting greater lengths than would be
  feasible with a drilled or reamed hole. Close dimensional tolerances are held to
  permit intimate fit for best heat transfer to surrounding medium.
• Heating elements arranged just beneath outside surface for maximum heat transfer,
  minimum wire temperature, and faster heating.
• Maximum surface temperatures up to 1200°F. Designations are etched on the
  sheath to preserve accurate shape.
• Long, trouble free service.
• Made in U.S.A.

Construction                     

1. Sealed end.
2. Mica.
3. Series 300 stainless steel sheath for non-oxidizing, stable service in cavities machined for them.
4. Element wire situated in close proximity to outside surface for maximum heat transfer, minimum
   wire temperature, and faster heating.
5. Magnesium oxide packing.
6. Ceramic element support.
7. Teflon insulated leads:  1/4" square.
   Fiberglass insulated leads:  3/8" to 1/2" square, 1/4" x 5/8" and 1/4" x 1" rectangular.
   

Square
Lengths between or longer than those listed may be ordered.

Square

Wattage
Minimum Wattage
The following table should be used to determine the allowable voltage for low wattage miniature elements:

NA - Not Available

Voltage
Standard voltage is either 120V or 240V. Other voltages are available.

Termination
All units within published amperage limits, are manufactured with 6" (type SF1) leads; longer length leads are available.
Standard insulation on 1/4" square units is Teflon (200°C).  Fiberglass (250°C) is standard on all other sizes.

Rectangular
Lengths between or longer than those listed may be ordered.

Rectangular
Lengths between or longer than those listed may be ordered.

Tolerances
Wattage tolerances are held to +5%, -105 at rated voltage. Width and height are always .001" less but not more
than .010" less than the nominal (fractional) heater size; length tolerances are ±2% with a ±1/16" minimum. This
sizing is maintained so that all units are a slide fit into a standard milled slot of the size required. Thermal action will
expand the unit to a snug fit for best heat conduction.

How to Order
After determining the wattage required and the line voltage available, determine the physical space available for heaters
and the numbers of heaters required.
Review Special Features.

Specify: catalog number, wattage, voltage, lead length, and special features required.
Example:  SR16-7.5/750W/240V/SF1-48.

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