3UA thermal relay is suitable for using in power system with AC 50Hz, rated operation voltage up to 660V and 1000V, in main circuit, current from 0.1A to 630A. It is used to protect AC three-phase asynchronous motor against overload and open-phase.

The current setting value can be regulated and the setting current values of many thermal elements are intercrossing overleaping arrangement, for easy selecting by the customers from -25C to +55C air temperarature as the products have temperature compensating. The relays have the test push-button for breaking NC contacts, the operating indication and free trip characteristics. The items conform to IEC292-1, IEC337-1

3UA50
Rated operating current: 12.5A
Rated insulation voltage: 660V
Current setting range: 0.1A to 14.5A

3UA52
Rated operating current: 25A
Rated insulation voltage: 660V
Current setting range: 0.1A to 25A

3UA54
Rated operating current: 32A
Rated insulation voltage: 660V
Current setting range: 4A to 36A

3UA55
Rated operating current: 45A
Rated insulation voltage: 660V
Current setting range: 0.1A to 45A

3UA58
Rated operating current: 80A
Rated insulation voltage: 1000V
Current setting range: 4A to 88A

3UA59
Rated operating current: 63A
Rated insulation voltage: 660V
Current setting range: 0.1A to 63A

3UA60
Rated operating current: 135A
Rated insulation voltage: 660V
Current setting range: 55A to 135A

3UA61
Rated operating current: 150A
Rated insulation voltage: 660V
Current setting range: 55A to 150A

3UA62
Rated operating current: 180A
Rated insulation voltage: 660V
Current setting range: 55A to 180A

3UA66
Rated operating current: 400A
Rated insulation voltage: 660V
Current setting range: 80A to 400A

3UA68
Rated operating current: 630A
Rated insulation voltage: 660V
Current setting range: 320A to 630A