MKY Series

Earth leakage breaker Primary side installatio DIN rail installation Degradation display Alarm contact terminal

DIN rail / screw mounting

agreement type with

deterioration display and

alarm contact terminal

DIN rail / screw mounting

agreement type with

deterioration display and

alarm contact terminal

DIN rail / screw mounting

agreement type with

deterioration display and

alarm contact terminal

MKY23 series

MKYS2 series

MKYS4 series

Product type identification

1

Circuit diagram

1
Item

Measurement

conditions

Performance

MKY23-05

MKY23-05S

MKY23-20

MKY23-20S

MKY44-20

MKY44-20S

MKYS2

MKYS2S

MKYS4

MKYS4S

Maximum continuous operating voltagr (50/60Hz)(Uc) -

Single-phase two-wire AC 130V, 250V

Single-phase three-wire AC 110V/220V

Three-phase three-wire AC 250V

Single-phase two-wire AC 130V, 250V

Single-phase three-wire AC 110V/220V

Three-phase three-wire AC 250V

Three-phase three-wire AC 510V

Three-phase four-wire AC 510V

Single-phase two-wire AC 130V, 250V

Single-phase three-wire AC 110V/220V

Three-phase three-wire AC 250V

Three-phase four-wire AC 250V

Three-phase three-wire AC 510V

Three-phase four-wire AC 510V

Maximum discharge current (Imax) 8/20µs

10 kA (3 time)

(inter line, to ground)

40 kA (inter line, to ground) 200 kA (inter line, to ground)
Nominal discharge current (Imax) 8/20µs

5 kA 

(inter line, to ground)

20 kA (inter line, to ground) 10 kA (inter line, to ground)
Voltage protection level (Up) Based on IEC

1.3 kV or less (inter line) 

1.5 kV or less (to ground)

1.5 kV or less (inter line) 

1.5 kV or less (to ground)

2.5 kV or less (inter line) 

2.5 kV or less (to ground)

1.3 kV or less (inter line) 

1.5 kV or less (to ground)

2.4 kV or less (inter line) 

2.4 kV or less (to ground)

External view

1