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Heating cables

Self-regulated heating cable Thermon VSX

Thermon VSXProcess Temperature Maintenance or Freeze Protection High performance VSX self-regulating heating cables are designed specifically for process temperature maintenance or freeze protection where high maintain temperatures or high temperature exposure is required.

The heat output of VSX cable varies in response to the surrounding temperature by reducing its thermal output with increasing temperature. With its high self-regulating characteristic, VSX can be installed in hazardous areas requiring a T3 temperature class rating.

Construction VSX

Конструкция Thermon VSX1. Nickel-plated copper bus wires (14 AWG).

2. Semiconductive heating matrix and fluoropolymer dielectric insulation.

3. Nickel-plated copper brai.

4. Fluoropolymer overjacket provides additional protection for cable and braid where exposure to chemicals or corrosives is expected.

Features Thermon VSX:

  • Freeze protection
  • Medium to high process temperature maintenance
  • Steam clean/purge
  • Certified for use in ordinary (nonclassified) areas and in potentially explosive atmospheres

Ratings Thermon VSX

  • Available watt densities: 16, 33, 49, 66 w/m @ 10°C
    (5, 10, 15, 20 w/ft @ 50°F)
  • Supply voltages: 110-120 or 208-277 Vac
  • Max. maintenance temperature: 149°C (300°F)
  • Max. exposure temperature:
    Intermittent power-on: 232°C (450°F)
    Intermittent power-off: 250°C (482°F)
    Continuous power-off: 204°C (400°F)
  • Minimum installation temperature: - 51°C (- 60°F)
  • Minimum bend radius:
    °F (-15°C): 10 mm (0.38”)76°F (- 60°C): 32 mm (1.25”)
  • T-rating: T3 200°C (392°F)

Power output curves Thermon VSX

The power outputs shown apply to cable installed on insulated metallic pipe (using the procedures outlined in IEEE 515) at the service voltages stated below. For use on other service voltages, contact Thermon.

Catalog number 120 vac nominal Catalog number 240 vac nominal Power output at 10°C (50°F) w/m (ft)
VSX 10-1 VSX 5-2 16 (5)
VSX 10-1 VSX 10-2 33 (10)
VSX 15-1 VSX 15-2 49 (15)
VSX 20-1 VSX 20-2 66 (20)

Circuit breaker sizing

Maximum circuit lengths for various circuit breaker amperages are shown below. Breaker sizing should be based on the National Electrical Code, Canadian Electrical Code or any other applicable code. The National Electrical Code and Canadian Electrical Code require ground-fault protection of equipment for each branch circuit supplying electric heating equipment. Check local codes for ground-fault protection requirements.

120 vac service voltage Max.circuit length vs. breaker size m (ft)
Catalog number Smart-up temperature °C (°F) 20А 30А 40A 50A
VSX 5-1 10 (50) 63 (205) 102 (335) 102 (335) 102 (335)
- 18 (0) 63 (205) 102 (335) 102 (335) 102 (335)
- 29 (- 20) 60 (195) 102 (335) 102 (335) 102 (335)
- 40 (- 40) 56 (185) 97 (315) 102 (335) 102 (335)
VSX 10-1 10 (50 41 (135) 66 (220) 80 (265) 80 (265)
- 18 (0) 41 (135) 66 (220) 80 (265) 80 (265)
- 29 (- 20) 38 (125) 63 (210) 80 (265) 80 (265)
- 40 (- 40) 36 (115) 58 (190) 80 (265) 80 (265)
VSX 15-1 10 (50) 30 (100) 48 (160) 71 (235) 71 (235)
- 18 (0) 30 (100) 48 (160) 71 (235) 71 (235)
- 29 (- 20) 29 (95) 47 (155) 70 (230) 71 (235)
- 40 (- 40) 27 (90) 44 (145) 65 (215) 69 (225)
VSX 20-1 10 (50) 21 (70) 32 (105) 45 (150) 62 (200)
- 18 (0) 18 (60) 28 (90) 39 (125) 52 (170)
- 29 (- 20) 17 (55) 26 (85) 36 (120) 48 (160)
- 40 (- 40) 16 (50) 25 (80) 34 (110) 45 (150)
240 vac service voltage Max.circuit length vs. breaker size m (ft)
Catalog number Smart-up temperature °C (°F) 20A 30A 40A 50A
VSX 5-2 10 (50) 126 (415) 209 (685) 209 (685) 209 (685)
- 18 (0) 126 (415) 209 (685) 209 (685) 209 (685)
- 29 (- 20) 120 (395) 209 (685) 209 (685) 209 (685)
- 40 (- 40) 112 (365) 193 (630) 209 (685) 209 (685)
VSX 10-2 10 (50) 82 (270) 133 (435) 172 (565) 172 (565)
- 18 (0) 78 (255) 128 (420) 172 (565) 172 (565)
- 29 (- 20) 72 (235) 117 (385) 172 (565) 172 (565)
- 40 (- 40) 66 (220) 107 (350) 163 (535) 172 (565)
VSX 15-2 10 (50) 61 (200) 97 (315) 142 (465) 161 (530)
- 18 (0) 53 (175) 84 (275) 123 (405) 161 (525)
- 29 (- 20) 50 (165) 79 (260) 115 (375) 148 (485)
- 40 (- 40) 48 (155) 75 (245) 108 (355) 138 (450)
VSX 20-2 10 (50) 45 (145) 70 (230) 99 (325) 124 (405)
- 18 (0) 39 (125) 60 (195) 84 (275) 114 (375)
- 29 (- 20) 37 (120) 56 (185) 79 (260) 106 (350)
- 40 (- 40) 34 (115) 53 (175) 75 (245) 100 (325)
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