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三个端子将总额定功率分成两个相等的电路。通过使用三热开关1/4，可以获得1/2或全瓦数。并联使用两个相等的电路以获得全功率。
规格
护套材料：铬钢
至高护套温度：1200℉
电源：120Vac或240Vac
Dimensions：inches(cm)
接线图
订货信息：
| 120Vac型号 | 240Vac型号 | A | B | D | Watts | W/in2† | Wt.(lb) |
| TH系列 | |||||||
| TH-10/120 | - | 10-1/2(27) | 9-1/2(24) | 9(23) | 400 | 17 | 0.75(0.3) |
| TH-12/120 | TH-12/240 | 12(30) | 11(28) | 10-1/2(27) | 500 | 17 | 0.88(0.4) |
| TH-15/120 | TH-15/240 | 15-1/4(39) | 14-1/2(37) | 13-3/4(35) | 750 | 18 | 1.13(0.5) |
| TH-18/120 | TH-18/240 | 17-7/8(45) | 16-7/8(43) | 16-3/8(42) | 1000 | 20 | 1.38(0.6) |
| TH-24/120 | TH-24/240 | 23-3/4(60) | 22-3/4(60) | 22-1/4(57) | 1250 | 17 | 1.38(0.6) |
| TH-30/120 | TH-30/240 | 30-1/2(77) | 29-3/8(75) | 28(71) | 1500 | 16 | 2.38(1.08) |
| TH-36/120 | TH-36/240 | 35-7/8(91) | 34-3/4(88) | 33-3/8(85) | 1750 | 15 | 2.88(1.3) |
| TH-43/120 | TH-43/240 | 42-1/2(108) | 41-3/8(105) | 40(102) | 1500 | 11 | 3.38(1.5) |
| TH-431/120 | TH-431/240 | 42-1/2(108) | 41-3/4(106) | 40(102) | 2000 | 15 | 3.38(1.5) |
| TH-48/120 | TH-48/240 | 47-7/8(122) | 46-3/4(119) | 45-3/8(115) | 1700 | 11 | 3.70(1.7) |
| TH-481/120 | TH-481/240 | 47-7/8(122) | 46-3/4(119) | 45-3/8(115) | 2250 | 14 | 3.70(1.7) |
| TH-54/120 | TH-54/240 | 53-7/8(137) | 52-3/4(134) | 51-3/8(130) | 2000 | 11 | 4.12(1.9) |
| TH-541/120 | TH-541/240 | 53-7/8(137) | 52-3/4(134) | 51-3/8(130) | 2500 | 14 | 4.12(1.9) |
| TH-64/120 | TH-64/240 | 63-7/8(162) | 62-3/4(160) | 61-3/8(156) | 2250 | 10 | 4.85(2.2) |
| TH-641/120 | TH-641/240 | 63-7/8(162) | 62-3/4(160) | 613/8(156) | 3000 | 13 | 4.85(2.2) |
| TH-72/120 | TH-72/240 | 71-7/8(183) | 70-3/4(180) | 69-3/8(176) | 2500 | 10 | 5.65(2.6) |
| - | TH-721/240 | 71-7/8(183) | 70-3/4(180) | 69-3/8(176) | 3000 | 13 | 5.65(2.6) |
| Type STTH | |||||||
| STTH-2307 | 23(58) | 22(56) | 21-1/2(55) | 750 | 12 | 1.38(0.6) | |
| STTH-2401 | 233-/4(60) | 22-3/4(60) | 22-1/4(57) | 1000 | 15 | 1.38(0.6) | |
†要确定至大允许功率密度，请留言联系广州市赛拓仪器科技有限公司。
订购示例：
TH-36/120,3端子120V，带材加热器
STTH-2307/240V,3端子240V带状加热器