NYKB Series
Miniature Circuit Breaker
（1A-125A）
Intelligent
Convenient
Safe
Comprehensive
NYKB Series
Miniature Circuit Breaker
（1A-125A）
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 , 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.
NYKB Series Miniature Circuit Breaker
Efficient current limiting and arc extinguishing capability, safer and clearer isolation function, reliable and stable overcurrent protection performance.
More assured operation
Safer electricity use
More convenient installation
A wide range of product specifications provide multiple choices
NYKB1H Series
NYKB2 Series
NYKB3 Series
NYKB5 Series
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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,3P,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 |
| 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 | 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 | 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 | 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 | 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 | 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 | 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 |
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,3P,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
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,3P+N,4P
Modulus (Multiple of 9mm) ：2,4,6,8
Rated residual action current (mA)：30,50,100,300
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:3 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:3 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