circuit breaker keeps tripping
1 PRODUCT PROFILE
Model NDB1-32 NDB1-125
Rated Voltage (V) AC230 AC400/415
Rated Current (A) 6、10、16、20、25、32 50、63、80、100、125
Number of Poles 1PN 1P、2P、3P、4P
Certi cate CCC CCC
- Product Overview
- Product Features
● Application Scope
NDB1 Series MCB of TT and TN-S earth-system have such functions: Short-Circuit and Overload
protection, control and disconnect. Such breaker is used in low-voltage terminal distribution for industry,
civil building, energy, telecommunication and construction.
● Design Features
◆ When MCB normally open or trip because fault,the phase line and neutral line should keep
disconnected status to avoid the electric hurt by electrified neutral line.
◆ Full Protection Functions with overload and short-circuit protection. When connect or do breaking
operation, you should connect the neutral line at first, then do breaking operation.
◆ Connection is safety and reliable: Use “Frame” connection structure
◆ Easily mounting: TH35 standard mounting rail.
2
NDB1 Series MCB
PRODUCT PROFILE
● Structure Features
◆ NDB1-32 External Structure
◆ NDB1-125 External Structure
1、Model
2、Operation Handle
3、Load
4、Line
● Standards
NDB1-32、NDB1-125 Standards as follow:
◆ GB 10963.1 Electrical accessories-Circuit-breakers for over-current protection for household and
similar installation-Part 1: Circuit-breakers for AC operation
◆ IEC 60898-1 Electrical accessories-Circuit-breakers for overcurrent protection for household and
similar installation-Part 1: Circuit-breakeres for a.c. operation
3 PRODUCT PROFILE - Working Condition
● Electrical symbol
● Applicable Condition
◆ Ambient Usage Temperature and Storage Temperature
Ambient Usage Temperature: -35℃~+70℃, Standard Temperature: +30℃, correction factor of different
ambient usage temperature refer to sheet 1
Storage Temperature: -35℃~+70℃.
◆ Altitude
The altitude of the mounting site≤2000m
◆ Relative Usage Humidity and Relative Storage Humidity
The relative humidity shouldn’t exceed 50% when the ambient air temperature is +40 degrees, higher
humidity can be allowed in lower temperature. For example, the humidity can be 90% when the ambient
temperature is +20 degrees. Necessary measures should be acted for the condensation produced by
the changed temperature.
● Pollution Degree
2
● Protection Level
Level of Product Protection: IP20
● Mounting Types
Ⅱ(For Load Level) and Ⅲ(For distribution and control Level)
● Mounting Method
Mounted on TH35mm x 7.5 Standard Rail.
● Mounting Direction
◆ Vertical Mounting: The inclination between mounting plane and vertical plane should ≤±5 degrees
◆ Horizontal Mounting
● Environmental Requirement
Comply with RoHS
4
NDB1 Series MCB
PRODUCT PROFILE
No. Implication Instruction
1 Brand Code ND：
2 Product Code B：Miniature Circuit Breaker
3 Design Code 1
4 Frame Rating-Rated
Current (A) 32 125
5
Instantaneous
Tripping
Characteristics
C：Instantaneous Tripping
Range 5In～10In；
B：Instantaneous Tripping Range
3~5In
C：Instantaneous Tripping Range
5~10In
D：Instantaneous Tripping Range
10~14In
6 Rated Working
Current (A) 6，10，16，20，25，32 50A，63A，80A，100A，125A
7 Number of Poles 1PN 1P，2P，3P，4P - Product Technical Characteristic
4.1 Model and Implication
ND B 1 – /
1 2 3 4 5 6 7
5 PRODUCT PROFILE
4.2 Technical Parameters
Model NDB1-32 NDB1-125
Current Voltage (V) AC230 AC230/240;DC60/80(1P), AC400/415;DC80/125
(2P、3P、4P)
Rated Current (A) 6、10、16、20、25、32 50、63、80、100,125
Tripping Characteristics C C、D
Number of Poles 1PN 1P、2P、3P、4P
Rated Insulation Voltage (V) AC400V AC500V
Rated Ultimate Short Circuit
Breaking Current
4.5kA
Rated Operation Short Circuit
Breaking Current
4.5kA
Rated Working Frequency (Hz) 50/60 50/60
Mechanical and Electrical Life 10000 10000
Connecting and Wiring
Capacity
◆ Tunnel Connecting Terminal
◆ Terminal Connecting Area: 1~6 mm2
cable is
applicable
◆ Connecting Screw is M4,Torque is 1.2N.m
◆ Tunnel Connecting Terminal
◆ Terminal Connecting Area: 10~50 mm2
cable is
applicable
◆ Connecting Screw is M7, Torque is 3.5N.m
6
● Temperature Correction Factor Sheet (1)
Ambient
Temperature
(℃)
Correction Current (A)
Rated
Current
(A)
Ambient
Temperature
(℃)
Correction Current (A)
Rated
Current
(A)
7 PRODUCT PROFILE
● NDB1-32 Tripping Curve
C Curve
★ Protect nominal load and distribution cables
★ Rated Current: 6-32A
★ Tripping Characteristics: Instantaneous tripping range 5In~10In
● NDB1-125 Tripping Curve
C Curve
★ Protect lighting distribution circuits
★ Tripping Characteristics: Instantaneous
tripping range 5In~10In
D Curve
★ Protect industrial distribution systems
★ Tripping Characteristics: Instantaneous
tripping range 10In~14In
4.3 Tripping Curve
8
NDB1 Series MCB
PRODUCT PROFILE
5.1 Accessory Sheet
5.2 NDB1-125 Accessory Types - Accessory
Note: Accessory parameters, please refer to “OF、SD, MX+OF” specimens.
No. Name Accessory Code Function and Matched Quantity
1 Auxiliary Contact OF
Linked to the left side of MCB to indicate OPEN or CLOSE status of the associated
breaker. Matched quantity: 3 Pcs Max.
2 Alarm Contact SD Linked to the left side of MCB to indicate the accidental tripping status of the
associated breaker. Matched quantity: 3 Pcs Max.
3 Shunt Release MX+OF Linked to the right side of MCB to indicate accidental tripping status and remote
breaking control of associated breaker.
Auxiliary Contact OF
Alarm Contact SD
Shunt Release MX+OF