3UA Thermal Relay
Application
3UA thermal relay is suitable for using in power system with AC 50Hz, rate 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 overlapping arrangement, for easy selecting by the customers from -25 to +55 air temperature as the products have temperature compensating. The relays have the test push-button for breaking NC contacts, the operating indications and free trip characteristics. The items conform to IEC60947-4.
Specifications
Type
Rate operating current(A)
Rated insulation voltage(V)
Current setting range(A)
3UA50
12.5
660
0.1-0.160.16-0.250.25-4 0.32-0.63 0.63-0.1 0.8-1.25 1-1.6 1.25-2 1.6-2.5 2-3.2 2.5-4 3.2-5 4-6.3 5-8 6.3-10 8-12.5
3UA52
25
660
0.1-0.16 0.16-0.25 0.25-0.4 0.4-0.63 0.63-1 0.8-1.25 1-1.6 1.25-2 1.6-2.5 2-3.2 2.5-4 3.2-5 4-6.3 5-8 6.3-10 8-12.5 10-16 12.5-20 16-25
3UA54
32
660
4-6.3 6.3-10 10-16 12.5-20 16-25 20-32
3UA58
80
1000
16-25 20-32 25-40 32-50 40-57 50-63 57-70 63-80
3UA59
63
600
0.1-0.16 0.16-0.25 0.25-0.4 0.4-0.63 0.63-1 0.8-1.25 1-1.6 1.25-2 1.6-2.5 2-3.2 2.5-4 3.2-5 4-6.3 5-8 6.3-10 8-12.5 10-16 12.5-20 16-25 20-32 25-40 32-45 40-57 50-63
3UA62
180
660
55-80 63-90 80-110 90-120 110-135 120-150 135-160 150-180
3UA66
400
1000
80-125 125-200 180-250 200-320 250-400
3UA68
630
1000
320-500 400-630

  
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