The maximum allowable input leakage current of UPS products is up to 5% of the UPS rated load current, which  is much higher than common 30mA configuration. Therefore, the operating current level must be increased when selecting the anti-leakage protector to prevent frequent misoperation. According to the regulations of the power department, UPS leakage protection It should be classified as a first-level general protection and belongs to leakage protection.

When there are multiple leakage protectors in the power distribution system, the selectivity of grading actions should be met. The rated leakage current of the upper-level leakage protector should be at least three times the rated leakage current of the lower-level leakage protector, and the minimum non-operation time of the upper-level leakage protector should be greater than the maximum cut-off time. The closing time of the lower level protector. Otherwise, due to the matching problem of the upper and lower actions, a large area power failure will occur.

RenAn residual current transducer products are designed to meet the requirements of multi-level residual current protections, with range from 0.01A to 10A, high accuracy & linearity, low zero offset voltage, high bandwidth and short dynamic response time.