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）。

       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

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

3UA55402A              10-16A

3UA55402B              12.5-20A

3UA55402C              16-25A

3UA55402D              20-32A

3UA55402Q             25-36A

3UA55402R              32-40A

3UA55408M             36-45A

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

3UA60402H             55-80

3UA60402W            63-90

3UA60402X             80-110

3UA60403H             90-120

3UA60403J             110-135

3UA61402H             55-80

3UA61402W            63-90

3UA61402X             80-110

3UA61403H             90-120

3UA61403J              110-135

3UA61403K             120-150

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