NYKB Series

Miniature Circuit Breaker

（1A-125A）

Intelligent Convenient Safe Comprehensive

PRODUCT OVERVIEW

Miniature circuit breaker is a kind of circuit protection equipment usually used in low-voltage circuits. Its main function is to quickly cut off the circuit when detecting abnormalities of the current (such as overload or short-circuit), so as to protect the electrical equipment and personal safety. It can prevent the damage caused by the circuit overload, short-circuit and other faults, while ensuring the normal operation of the circuit.

NYKB series miniature circuit breakers can quickly cut off the power supply when the circuit is abnormal to protect the safety of equipment and personnel. It has stable operating performance and long service life, which is suitable for being installed in places with limited space places with limited space, such as electrical control cabinets, household appliances, etc. A variety of rated currents and rated voltages are optional to meet the needs of different circuits.

PRODUCT CHARACTERITICS

NYKB Series Miniature Circuit Breaker

Efficient current limiting and arc extinguishing capability, safer and clearer isolation function, reliable and stable overcurrent protection performance.

Built-in tripping indication

More assured operation

Leakage protection function

Safer electricity use

Guide rail mounted

More convenient installation

PRODUCT DIVERSITY

A wide range of product specifications provide multiple choices

NYKB1h Series

NYKB2 Series

NYKB3 Series

NYKB5 Series

Technical Parameters

NYKB1H Series Miniature Circuit Breaker

Model Rated currentIn (A) Tripping curve Impulse withstand voltage Uimp(kV) Breaking capacity (kA) Rated voltage（V） Number of poles Modulus (Multiple of 9mm)
NYKB1H 1 C、D 4 6 AC 230/400 1P、2P、 3P、4P 2、4、6、8
NYKB1H 2 4 6
NYKB1H 3 4 6
NYKB1H 4 4 6
NYKB1H 6 4 6
NYKB1H 10 4 6
NYKB1H 16 4 6
NYKB1H 20 4 6
NYKB1H 25 4 6
NYKB1H 32 4 6
NYKB1H 40 4 6
NYKB1H 50 4 6
NYKB1H 63 4 6

NYKB1HL Series Miniature Circuit Breaker

Model Rated currentIn (A) Tripping curve Impulse withstand voltage Uimp(kV) Breaking capacity (kA) Rated voltage（V） Number of poles Modulus (Multiple of 9mm) Rated residual action current (mA)
NYKB1HL 6 C、D 4 6 AC 230/400 1P+N、2P、3 P、3P+N、4P 5、6、7、8、 10、11、11.5、 13、15 30、50、 100、300
NYKB1HL 10 4 6
NYKB1HL 16 4 6
NYKB1HL 20 4 6
NYKB1HL 25 4 6
NYKB1HL 32 4 6
NYKB1HL 40 4 6
NYKB1HL 50 4 6
NYKB1HL 63 4 6

NYKB2 Series Miniature Circuit Breaker

Model Rated currentIn (A) Tripping curve Breaking capacity (kA) Rated voltage（V） Number of poles Modulus (Multiple of 9mm)
NYKB2 6 C、D 4.5 AC 230 1P+N 2
NYKB2 10 4.5
NYKB2 16 4.5
NYKB2 20 4.5
NYKB2 25 4.5
NYKB2 32 4.5

NYKB2L Series Miniature Circuit Breaker

Model Rated currentIn (A) Tripping curve Breaking capacity (kA) Rated voltage（V） Number of poles Modulus (Multiple of 9mm) Rated residual action current (mA)
NYKB2L 6 C、D 4.5 AC 230 1P+N 4 30、50、 100、300
NYKB2L 10 4.5
NYKB2L 16 4.5
NYKB2L 20 4.5
NYKB2L 25 4.5
NYKB2L 32 4.5

NYKB3 Series Miniature Circuit Breaker

Model Rated currentIn (A) Instantaneous tripping current Impulse withstand voltage Uimp(kV) Breaking capacity (kA) Rated voltage（V） Number of poles Modulus (Multiple of 9mm)
NYKB3 63 10In、12In 6 10 AC 230/400 1P、2P、 3P、4P 3、6、9、12
NYKB3 80 6 10
NYKB3 100 6 10
NYKB3 125 6 10

NYKB5 Series Miniature Circuit Breaker

Model Rated currentIn (A) Tripping curve Mechanical life（Times） Breaking capacity (kA) Rated voltage（V） Number of poles Modulus (Multiple of 9mm)
NYKB5 6 C、D 4000 10 AC 230/400 1P、2P、 3P、4P 2、4、6、8
NYKB5 10 4000 10
NYKB5 16 4000 10
NYKB5 20 4000 10
NYKB5 25 4000 10
NYKB5 32 4000 10
NYKB5 40 4000 10
NYKB5 50 4000 10
NYKB5 63 4000 10

NYKB5L Series Miniature Circuit Breaker

Model Rated currentIn (A) Tripping curve Mechanical life（Times） Breaking capacity (kA) Rated voltage（V） Number of poles Modulus (Multiple of 9mm) Rated residual action current(mA)
NYKB5L 6 C、D 4000 10 AC 230/400 1P+N、2P、3 P、3P+N、4P 2、4、6、8 30、50、 100、300
NYKB5L 10 4000 10
NYKB5L 16 4000 10
NYKB5L 20 4000 10
NYKB5L 25 4000 10
NYKB5L 32 4000 10
NYKB5L 40 4000 10
NYKB5L 50 4000 10
NYKB5L 63 4000 10
Selection table

NYKB1H Series Miniature Circuit Breaker

NYKB1H 3P C 16A Additional functions
Product code Pole No. Tripping characteristics Rated current Additional functions
NYKB1H：
Miniature Circuit Breaker		 1P:1 pole
2P:2 pole
3P:3 pole
4P:4 pole		 C type
D type		1A
2A
3A
4A
6A
10A
16A
20A
25A
32A
40A
50A
63A		 SD:Alarm
OF:Auxiliary
OF+OF:Double auxiliary
OF+SD:Auxiliary+Alarm
MX+OF:Shunt release+Auxiliary
MV:Overvoltage tripper
MN:Under-voltage tripper
MV+MN:Over-voltage and under-voltage trippers

NYKB1HL Series Miniature Circuit Breaker

NYKB1HL 3P C 16A 30mA Additional functions
Product code Pole No. Tripping characteristics Rated current Residual current Additional functions
NYKB1HL：
Leakage protection circuit breaker 		1P+N:1 pole+N
2P:2 pole
3P+N:3 pole+N
4P:4 pole		 C type
D type		6A
10A
16A
20A
25A
32A
40A
50A
63A		 30mA
50mA
100mA
300mA		 SD:Alarm
OF:Auxiliary
OF+OF:Double auxiliary
OF+SD:Auxiliary+Alarm
MX+OF:Shunt release+Auxiliary
MV:Overvoltage tripper
MN:Under-voltage tripper
MV+MN:Over-voltage and under-voltage trippers

NYKB2 Series Miniature Circuit Breaker

NYKB2 1P+N C 16A
Product code Pole No. Tripping characteristics Rated current
NYKB2：
Miniature Circuit Breaker		 1P+N:1 pole+N C type
D type		 6A
10A
16A
20A
25A
32A

NYKB2L Series Miniature Circuit Breaker

NYKB2L 1P+N C 16A 30mA
Product code Pole No. Tripping characteristics Rated current Residual current
NYKB2L：
Leakage Protection Circuit Breaker		 1P+N:1 pole+N C type
D type		 6A
10A
16A
20A
25A
32A		 30mA
50mA
100mA
300mA

NYKB3 Series Miniature Circuit Breaker

NYKB3 3P 100A Additional functions
Product code Pole No. Rated current Additional functions
NYKB3：
Miniature Circuit Breaker		 1P:1 pole
2P:2 pole
3P:3 pole
4P:4 pole		 63A
80A
100A
125A		 SD:Alarm
OF:Auxiliary
OF+OF:Double auxiliary
OF+SD:Auxiliary+Alarm
MX+OF:Shunt release+Auxiliary
MV:Overvoltage tripper
MN:Under-voltage tripper
MV+MN:Over-voltage and under-voltage trippers

NYKB5 Series Miniature Circuit Breaker

NYKB5 3P C 16A Additional functions
Product code Pole No. Tripping characteristics Rated current Additional functions
NYKB5：
Miniature Circuit Breaker		 1P:1 pole
2P:2 pole
3P:3 pole
4P:4 pole		 C type
D type		 6A
10A
16A
20A
25A
32A
40A
50A
63A		 SD:Alarm
OF:Auxiliary
OF+OF:Double auxiliary
OF+SD:Auxiliary+Alarm
MX+OF:Shunt release+Auxiliary
MV:Overvoltage tripper
MN:Under-voltage tripper
MV+MN:Over-voltage and under-voltage trippers

NYKB5L Series Miniature Circuit Breaker

NYKB5L 3P C 16A 30mA Additional functions
Product code Pole No. Tripping characteristics Rated current Residual current Additional functions
NYKB5L：
Leakage Protection Circuit Creaker 		1P+N:1 pole+N
2P:2 pole
3P+N:3 pole+N
4P:4 pole		 C type
D type		6A
10A
16A
20A
25A
32A
40A
50A
63A		 30mA
50mA
100mA
300mA		 SD:Alarm
OF:Auxiliary
OF+OF:Double auxiliary
OF+SD:Auxiliary+Alarm
MX+OF:Shunt release+Auxiliary
MV:Overvoltage tripper
MN:Under-voltage tripper
MV+MN:Over-voltage and under-voltage trippers
Technical Parameters


  • Model：NYKB1H

    Rated currentIn (A)：1、2、3、4、10、16、20、25、32、40、50、63

    Tripping curve：C、D

    Impulse withstand voltage Uimp(kV)：4

    Breaking capacity (kA)：6

    Rated voltage（V）：AC 230/400

    Number of poles ：1P、2P、 3P、4P

    Modulus (Multiple of 9mm) ：2、4、6、8

  • Model：NYKB1HL

    Rated currentIn (A)：6、10、16、20、25、32、40、50、63

    Tripping curve：C、D

    Impulse withstand voltage Uimp(kV)：4

    Breaking capacity (kA)：6

    Rated voltage（V）：AC 230/400

    Number of poles ：1P+N、2P、3 P、3P+N、4P

    Modulus (Multiple of 9mm) ：5、6、7、8、 10、11、11.5、 13、15

    Rated residual action current (mA) ：30、50、 100、300

  • Model：NYKB2

    Rated currentIn (A)：6、10、16、20、25、32

    Tripping curve：C、D

    Breaking capacity (kA)：4.5

    Rated voltage（V）：AC 230

    Number of poles ：1P+N

    Modulus (Multiple of 9mm) ：2

  • Model：NYKB2L

    Rated currentIn (A)：6、10、16、20、25、32

    Tripping curve：C、D

    Breaking capacity (kA)：4.5

    Rated voltage（V）：AC 230

    Number of poles ：1P+N

    Modulus (Multiple of 9mm) ：4

    Rated residual action current (mA) ：30、50、 100、300

  • Model：NYKB3

    Rated currentIn (A)：63、80、100、125

    Instantaneous tripping current：10In、12In

    Impulse withstand voltage Uimp(kV)：6

    Breaking capacity (kA)：10

    Rated voltage（V）：AC 230/400

    Number of poles ：1P、2P、 3P、4P

    Modulus (Multiple of 9mm) ：3、6、9、12

  • Model：NYKB5

    Rated currentIn (A)：6、10、16、20、25、32、40、50、63

    Tripping curve：C、D

    Mechanical life（Times）：4000

    Breaking capacity (kA)：10

    Rated voltage（V）：AC 230/400

    Number of poles ：1P、2P、 3P、4P

    Modulus (Multiple of 9mm) ：2、4、6、8

    Rated residual action current (mA) ：30、50、 100、300

  • Model：NYKB5L

    Rated currentIn (A)：6、10、16、20、25、32、40、50、63

    Tripping curve：C、D

    Mechanical life（Times）：4000

    Breaking capacity (kA)：10

    Rated voltage（V）：AC 230/400

    Number of poles ：1P+N、2P、 3P+N、4P

    Modulus (Multiple of 9mm) ：2、4、6、8

    Rated residual action current (mA)：30、50、 100、300

Selection table


  • Product code ：NYKB1H：Miniature Circuit Breaker

    Pole No.：1P:1 pole、2P:2 pole、3P:3 pole、4P:4 pole

    Tripping characteristics：C type、D type

    Rated current：1A、2A、3A、4A、6A、10A、16A、20A、25A、32A、40A、50A、63A

    Additional functions：SD:Alarm、OF:Auxiliary、OF+OF:Double auxiliary、OF+SD:Auxiliary+Alarm、MX+OF:Shunt release+Auxiliary、MV:Overvoltage tripper、MN:Under-voltage tripper、MV+MN:Over-voltage and under-voltage trippers

  • Product code：NYKB1HL：Leakage protection circuit breaker

    Pole No.：1P+N:1 pole+N、2P:2 pole、3P+N:3 pole+N、4P:4 pole

    Tripping characteristics：C type、D type

    Rated current：6A、10A、16A、20A、25A、32A、40A、50A、63A

    Residual current ：30mA、50mA、100mA、300mA

    Additional functions：SD:Alarm、OF:Auxiliary、OF+OF:Double auxiliary、OF+SD:Auxiliary+Alarm、MX+OF:Shunt release+Auxiliary、MV:Overvoltage tripper、MN:Under-voltage tripper、MV+MN:Over-voltage and under-voltage trippers

  • Product code ：NYKB2：Miniature Circuit Breaker

    Pole No.：1P+N:1 pole+N

    Tripping characteristics：C type、D type

    Rated current：6A、10A、16A、20A、25A、32A

  • Product code ：NYKB2L: Leakage Protection Circuit Breaker

    Pole No.：1P+N:1 pole+N

    Tripping characteristics：C type、D type

    Rated current：6A、10A、16A、20A、25A、32A

  • Product code ：NYKB3：Miniature Circuit Breaker

    Pole No.：1P:1 pole、2P:2 pole、3P:3 pole、4P:4 pole

    Rated current：63A、80A、100A、125A

    Additional functions：SD:Alarm、OF:Auxiliary、OF+OF:Double auxiliary、OF+SD:Auxiliary+Alarm、MX+OF:Shunt release+Auxiliary、MV:Overvoltage tripper、MN:Under-voltage tripper、MV+MN:Over-voltage and under-voltage trippers

  • Product code ：NYKB5：Miniature Circuit Breaker

    Pole No.：1P:1 pole、2P:2 pole、3P:3 pole、4P:4 pole

    Tripping characteristics：C type、D type

    Rated current：6A、10A、16A、20A、25A、32A、40A、50A、63A

    Additional functions：SD:Alarm、OF:Auxiliary、OF+OF:Double auxiliary、OF+SD:Auxiliary+Alarm、MX+OF:Shunt release+Auxiliary、MV:Overvoltage tripper、MN:Under-voltage tripper、MV+MN:Over-voltage and under-voltage trippers

  • Product code ：NYKB5L：NYKB5L: Leakage Protection Circuit Creaker

    Pole No.：1P+N:1 pole+N、2P:2 pole、3P+N:3 pole+N、4P:4 pole

    Tripping characteristics：C type、D type

    Rated current：6A、10A、16A、20A、25A、32A、40A、50A、63A

    Residual current ：30mA、50mA、100mA、300mA

    Additional functions：SD:Alarm、OF:Auxiliary、OF+OF:Double auxiliary、OF+SD:Auxiliary+Alarm、MX+OF:Shunt release+Auxiliary、MV:Overvoltage tripper、MN:Under-voltage tripper、MV+MN:Over-voltage and under-voltage trippers

page top