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Marathon Heater, Inc.
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Employment | Square Cartridge HeatersFor those applications where a drilled hole is not practical, Marathon Heater offers square cartridge heaters. Unlike other manufacturer's square cartridge heaters, Marathon's square cartridge heaters are swaged, allowing them to be used in high temperature and high watt density applications. Square heaters are ideal for milled slots in long platens where drilling a long hole would be too difficult. Square heaters are also much easier to remove from a slot after extended high temperature usage than removing a round heater from a drilled hole. |
Marathon square cartridge heaters are available with a wide variety of options:
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| |  | Right angle leads Stainless steel braid Stainless steel flexible conduit Internal thermocouples Teflon end seal Epoxy end seal Silicon rubber end seal Tab stops, flanges, weld beads, etc. Special wattage profiles
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Technical specifications:
| 3/8 | ½ | 5/8 | | Max cross section | .374 | .499 | .624 | | Min cross section | .369 | .494 | .619 | | Std. Lead wire gage | 22 | 22 | 18 | | Maximum amps with std. Lead wire | 9 | 9 | 15 | | Max lead wire gage | 22 | 18 | 18 | | Max amps with large gage lead wire | 9 | 15 | 15 | | Maximum volts | 300 | 300 | 300 | | Lead wire temperature rating | 550°C | 550°C | 550°C |
Maximum recommended watt density
| Clearance (Inches) | Temperature °F | | 1200° | 1000° | 800° | 600° | 400° | 200° | | 0.002 | 105 | 200 | 225 | 225 | 225 | 225 | | 0.003 | 90 | 150 | 220 | 225 | 225 | 225 | | 0.004 | 75 | 130 | 160 | 225 | 225 | 225 | | 0.005 | 65 | 105 | 150 | 210 | 225 | 225 | | 0.007 | 50 | 75 | 110 | 150 | 175 | 225 | | 0.010 | 45 | 65 | 80 | 110 | 150 | 170 | | 0.015 | 35 | 55 | 70 | 80 | 105 | 120 | | 0.030 | 30 | 45 | 60 | 65 | 75 | 80 | | 0.060 | 20 | 30 | 35 | 40 | 45 | 50 | | 0.100 | 15 | 25 | 30 | 35 | 35 | 35 |
When using heaters in an open slot (ie. One side of heater exposed to open air), use figures 30% less than these.
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