For those applications where a drilled hole is not practical, Marathon Heater offers square cartridge heaters. Unlike square cartridge heaters from other manufacturers, 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:
- 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
Technical Specifications
| 3/8 | 1/2 | 5/8 | |
|---|---|---|---|
| Max cross sec | 0.374 | 0.499 | 0.624 |
| Min cross sec | 0.369 | 0.494 | 0.619 |
| Std. Lead wire | 22 | 22 | 18 |
| Maximum amp | 9 | 9 | 15 |
| Max lead wire | 22 | 18 | 18 |
| Max amps with | 9 | 15 | 15 |
| Maximum volts | 300 | 300 | 300 |
| Lead wire temp | 550°C | 550°C | 550°C |
Recommended Maximum Watt Densities
| Clearance (Inches) | Temprature in 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 |
| 0.01 | 45 | 65 | 80 | 110 | 150 | 170 |
| 0.015 | 35 | 55 | 70 | 80 | 105 | 120 |
| 0.03 | 30 | 45 | 60 | 65 | 75 | 80 |
| 0.06 | 20 | 30 | 35 | 40 | 45 | 50 |
| 0.1 | 15 | 25 | 30 | 35 | 35 | 35 |
