热过载继电器用于电机过载保护，当电动机过载达到一定程度时，热元件被加热达到一定弯曲程度，推动热继电器动作结构。热继电器的动作时间与过载电流的大小按反时限关系变化〔而作为电动机过载保护的热继电器，必须保证电动机的正常起动和运行不受影响，并能最大限度的发挥电动机的承载能力，因此热继电器的动作特性曲线应位于电动机的允许发热特性曲线的下方，且又接近于它）。
河南东日智能销售西门子热过载继电器，现货有需要质询可打电话13838084023
| 型号 | 电流 |
| 3UA50400A | 0.1-0.16 |
| 3UA50400C | 0.16-0.25 |
| 3UA50400E | 0.25-0.4 |
| 3UA50400G | 0.4-0.63 |
| 3UA50400J | 0.63-1 |
| 3UA50400K | 0.8-1.25 |
| 3UA50401A | 1-1.6 |
| 3UA50401B | 1.25-2 |
| 3UA50401C | 1.6-2.5 |
| 3UA50401D | 2-3.2 |
| 3UA50401E | 2.5-4 |
| 3UA50401F | 3.2-5 |
| 3UA50401G | 4-6.3 |
| 3UA50401H | 5-8A |
| 3UA50401J | 6.3-10 |
| 3UA50401K | 8-12.5 |
| 3UA50402S | 10-14.5 |
| 3TF42/43/32/33/3TD42/3TB42/43 |
| 3UA52401A | 1-1.6 |
| 3UA52401B | 1.25-2 |
| 3UA52401C | 1.6-2.5 |
| 3UA52401D | 2-3.2 |
| 3UA52401E | 2.5-4 |
| 3UA52401F | 3.2-5 |
| 3UA52401G | 4-6.3 |
| 3UA52401H | 5-8A |
| 3UA52401J | 6.3-10 |
| 3UA52401K | 8-12.5 |
| 3UA52402A | 10-16A |
| 3UA52402B | 12.5-20 |
| 3UA52402C | 16-25 |
| 3TF/44/45/34/35/3TD44/45/3TE44 |
| 3UA55402A | 10-16A |
| 3UA55402B | 12.5-20A |
| 3UA55402C | 16-25A |
| 3UA55402D | 20-32A |
| 3UA55402Q | 25-36A |
| 3UA55402R | 32-40A |
| 3UA55408M | 36-45A |
| 型号 | 电流 |
| 3UA58402B | 12.5-20 |
| 3UA58402C | 16-25 |
| 3UA58402D | 20-32 |
| 3UA58402E | 25-40 |
| 3UA58402F | 32-50 |
| 3UA58402T | 40-57 |
| 3UA58402P | 50-63 |
| 3UA58402V | 57-70 |
| 3UA58402U | 63-80 |
| 3UA58408W | 70-88 |
| 3TF50/3TE48/49/3TD50/3TB50 | |
| 3UA60402H | 55-80 |
| 3UA60402W | 63-90 |
| 3UA60402X | 80-110 |
| 3UA60403H | 90-120 |
| 3UA60403J | 110-135 |
| 3TF51 | |
| 3UA61402H | 55-80 |
| 3UA61402W | 63-90 |
| 3UA61402X | 80-110 |
| 3UA61403H | 90-120 |
| 3UA61403J | 110-135 |
| 3UA61403K | 120-150 |
| 3TF52/53/3TE52/3TB52 |
| 3UA62402H | 55-80 |
| 3UA62402W | 63-90 |
| 3UA62402X | 80-110 |
| 3UA62403H | 90-120 |
| 3UA62403J | 110-135 |
| 3UA62403K | 120-150 |
| 3UA62403L | 135-160 |
| 3UA62403M | 150-180 |
| 3UA66402K | 80-125 |
| 3UA66403B | 125-200 |
| 3UA66403C | 160-250 |
| 3UA66403D | 200-320 |
| 3UA66403E | 250-400 |
