16A, B curve iniature circuit breakers

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
Certicate CCC CCC

  1. Product Overview
  2. 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
  3. 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
  4. 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
  5. 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

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