1．Features: 

① Fully enclosed, good environmental resistance, strong insulation and isolation capabilities, moisture-proof and shock-proof, and beautiful appearance;

② Different colors of the secondary lead wires of the current transformer facilitate the distinction of terminals with the same name;

③ The use of combined transformers saves more space in the table than the same number of single transformers;

④ The three-phase three-wire circuit adopts two-in-one, and the three-phase four-wire circuit adopts three-in-one .

2．Ambient Conditions:

① Ambient temperature: -55℃～+85℃;

② Relative humidity: ≤90% at 40℃;

③ Atmospheric pressure: 860～1060mbar(about 650～800mmHg).

3．Operating Frequency Range: 20Hz~1kHz

4．Insulation Thermal Class: Class B (130°C)

5．Safety Features:

① Insulation resistance: >1000MΩ in normal condition;

② Insulation withstand voltages: 2.5KV 50Hz/1min.

③ Fire retardancy: In conformity with UL94-V0.

6．Outline Drawing, Installation Dimension and Coil Diagram: (tolerance±1mm)

①Applicable to three-phase three-wire (STA 1318A) outline drawing, installation dimension and coil diagram:

② Applicable to three-phase four-wire (STA1318B) outline drawing, installation size and coil diagram:

● Note: The lengths of both the input and output leads can be customized according to customer requirements.

7. Performance Parameters:

● Notes:

a. In practical applications, the sampling resistance should be less than or equal to the rated value given in the above table, which will improve the nonlinearity and phase shift;

b. If the conversion ratio required by the user is different from the above, it can be customized according to the user's requirements.

8. Attention:

① Connect the primary winding of the current transformer in series in the circuit under test. Operate the secondary winding approximately in a short-circuit state.

② Do not allow the secondary circuit of the current transformer to be open-circuited. Do not install any fuses in the secondary circuit.