Ek-21 imbalance, missing phase, overload, phase sequence (wrong phase) protection

Ek-22 imbalance, lack of phase, overload

Function is introduced

Current display: in the normal working state (standby), the three-phase current value is displayed in a loop, and the switching interval is 3 seconds. In the fault working state, the three-phase current value is locked in a loop to display the fault, which is convenient for finding the fault cause.

Overload protection: when any one phase current is detected to exceed the set setting current, the protector disconnects the load.

Phase loss protection: when phase loss or serious imbalance (over 50% of the imbalance value) is detected, the protector disconnects the load.

Unbalance protection: formula: (maximum - minimum

Example: a-phase 20A, b-phase 25A, and c-phase 22A, the unbalance value = (25-20) / 2.25 x 100%=20%. When the unbalance value is detected to exceed the set value, the protector action and the load is disconnected.

Phase error protection: when phase error and phase error are detected, the protector disconnects the load.

Power on delay: when power on each time, the load terminal will delay output.

Technical indicators

Power supply: AC220V plus or minus 10% 50Hz

Output contact power: resistance AC220V/10A

Dimensions: 125mm (length) x 40mm (width) x 86mm(height)

Resolution: 0.1a for those less than 100A and 1A for those greater than or equal to 100A

Current control range: 2-125a