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NDM3 Series Molded Case Circuit Breaker
Updated:August 07,2020 10:13AM

Rated current from 10A 16A 20A 25A 32A 40A 50A 63A 80A 100A 125A 140A 160A 180A 200A 225A 250A 315A 350A 400A 500A 630A 700A to 800A 1000A 1250A; Rated operational voltage (Ue) from 380/400/415VAC 500VAC to 660/690VAC; Rated limit short-circuit breaking capacity Icu (AC415V) from 35kA to 100 kA; including 3 poles and 4 poles.

NDM3-63M
NDM3-125M
NDM3-1600

Description

Description of NDM3 Series

The NDM3 series of molded case circuit breakers (hereinafter referred to as MCCBs) apply to infrequent switching of circuits with the AC 50/60Hz, the rated working voltage of AC690V and rated working current of 1250A as well as infrequent motor starting. Meanwhile, the circuit breaker features the overload alarm non-tripping function. In case of the line overload, the circuit breaker with the function will not be tripped, but only output the overload signal to ensure the power supply continuity. Products can be used for a duration of 8 hours at 1.3 times of the rated current with the performance remaining the same after cooling. The circuit breaker can substitute the thermal relay alarm solutions; with the overload, short circuit and undervoltage protection functions, the circuit breaker can protect lines and power equipment from damage.

 

Features

Features of NDM3 Series

  • Four types: C type (basic), L type (standard), M type (higher breaking) and H type (high breaking type) by the rated limit short-circuit breaking capability.
  • Smaller size, higher breaking capability.
  • Efficient short arcing, vibration resistance.
  • Boxed accessories may be used for rapid installation of circuit breaker, and timely respond to the user requirements without any adjustments.

 

Technology data

Technology data of NDM3 Series

NDM3-63 series

Rated current of housing Inm (A) 63
Rated current In (A) 10, 16, 20, 25, 32, 40, 50, 63
Rated insulation voltage Ui (AC V) 1000
Rated impulse withstand voltage Uimp (V) 800
Number of poles 3 4
Rated limit short-circuit breaking capacity level L M  
Rated limit short-circuit breaking capacity Icu(kA) AC380/400/41
5V 
36 55 55
AC500V   20 20
AC660/690V   12 12
Rated operating short-circuit breaking capacity Ics (kA) AC380/400/41
5V 
36 40 40
AC500V   15 15
AC660/690V   10 10

NDM3-100 series

Rated current of housing Inm (A) 100
Rated current In (A) 10, 16, 20, 25, 32, 40, 50, 63, 80, 100
Rated insulation voltage Ui (AC V) 1000
Rated impulse withstand voltage Uimp (V) 800
Number of poles 3 4
Rated limit short-circuit breaking capacity level C  
Rated limit short-circuit breaking capacity Icu(kA) AC380/400/41
5V 
40 40
AC500V 15 15
AC660/690V 12 12
Rated operating short-circuit breaking capacity Ics (kA) AC380/400/41
5V 
30 30
AC500V 12 12
AC660/690V 10 10

NDM3-125 series

Rated current of housing Inm (A) 125
Rated current In (A) 16, 20, 25, 32, 40, 50, 63, 80, 100, 125
Rated insulation voltage Ui (AC V) 1000
Rated impulse withstand voltage Uimp (V) 800
Number of poles 3 4
Rated limit short-circuit breaking capacity level L M H  
Rated limit short-circuit breaking capacity Icu(kA) 41
5V
40 70 100 70
AC500V   40   40
690V   20   20
Rated operating short-circuit breaking capacity Ics (kA) 41
5V 
30 50 70 50
AC500V   40   40
690V   10   10

NDM3-160 series

Rated current of housing Inm (A) 160
Rated current In (A) 125, 140, 160
Rated insulation voltage Ui (AC V) 1000
Rated impulse withstand voltage Uimp (V) 800
Number of poles 3 4
Rated limit short-circuit breaking capacity level C L M  
Rated limit short-circuit breaking capacity Icu(kA) 400V  35 40 70 70
690V     20 20
Rated operating short-circuit breaking capacity Ics (kA) 400V  25 30 50 50
690V     10 10
Sizes (W×L×H)mm NDM3-160C:3P 92×139×75.5 
NDM3-160L:3P 92×150×74.5
NDM3-160M:3P 92×150×92.5
NDM3-160:4P 122×150×92.5

NDM3-250 series

Rated current of housing Inm (A) 250
Rated current In (A) 100, 125, 140, 160, 180, 200, 225, 250
Rated insulation voltage Ui (AC V) 1000
Rated impulse withstand voltage Uimp (V) 800
Number of poles 3 4
Rated limit short-circuit breaking capacity level L M H  
Rated limit short-circuit breaking capacity Icu(kA) AC380/400/41
5V 
40 70 100 70
AC500V   40   40
AC660/690V   20   20
Rated operating short-circuit breaking capacity Ics (kA) AC380/400/41
5V 
30 50 70 50
AC500V   40   40
AC660/690V   10   10

NDM3-400 series

Rated current of housing Inm (A) 400
Rated current In (A) 225, 250, 315, 350, 400
Rated insulation voltage Ui (AC V) 1000
Rated impulse withstand voltage Uimp (V) 800
Number of poles 3 4
Rated limit short-circuit breaking capacity level C L M H  
Rated limit short-circuit breaking capacity Icu(kA) 41
5V 
35 50 70 100 70
AC500V     50   50
690V     20   20
Rated operating short-circuit breaking capacity Ics (kA) 41
5V 
35 50 70 75 70
AC500V     50   50
690V     15   15

NDM3-630 series

Rated current of housing Inm (A) 630
Rated current In (A) 400、500、630
Rated insulation voltage Ui (AC V) 1000
Rated impulse withstand voltage Uimp (V) 800
Number of poles 3 4
Rated limit short-circuit breaking capacity level C L M H  
Rated limit short-circuit breaking capacity Icu(kA) 41
5V 
35 50 70 100 70
AC500V     50   50
690V     20   20
Rated operating short-circuit breaking capacity Ics (kA) 41
5V 
35 50 70 75 70
AC500V     50   50
690V     15   15

NDM3-800 series

Rated current of housing Inm (A) 800
Rated current In (A) 630, 700, 800
Rated insulation voltage Ui (AC V) 1000
Rated impulse withstand voltage Uimp (V) 800
Number of poles 3 4
Rated limit short-circuit breaking capacity level M H  
Rated limit short-circuit breaking capacity Icu(kA) AC380/400/41
5V 
70 100 70
AC660/690V 70 100 70
Rated operating short-circuit breaking capacity Ics (kA) AC380/400/41
5V 
70 75 70
AC660/690V 70 75 70

 

Datasheet of NDM3 Series

NDM3-Series-MCCB-Datasheet.pdf

 

FAQs

Questions & Answers for NDM3 Series

  • What is a molded case circuit breaker?
    Moulded Case Circuit Breakers Explained. ... A moulded case circuit breaker (MCCB) is a type of electrical protection device that is used to protect the electrical circuit from excessive current, which can cause overload or short circuit.
  • What is the difference between MCCB and MCB?
    MCB is miniature circuit breaker which is used to break small currents. Like in domestic LT circuits. The ratings usually end up to 100 A. MCCB is a Module case circuit breaker which has a rugged construction as it can break larger currents usually from (100-1000A).
  • What is MCCB and its working?
    Molded Case Circuit Breaker (MCCB) is a circuit breaker and trip device assembled in a mould case. Also it can automatically cut off electric power in case of overload and short circuit. It is meant for higher rated current and is commonly used in Industrial applications.
  • What causes MCCB to trip?
    Circuit overloading is known to be the most common reason for circuit breaker tripping. It simply means that we're running too many heavy power-consuming devices at the same time on the same circuit. The next most dangerous cause is a short circuit.
  • How do molded case circuit breakers work?
    The traditional molded-case circuit breaker uses electromechanical (thermal magnetic) trip units that may be fixed or interchangeable. An MCCB provides protection by combining a temperature sensitive device with a current sensitive electromagnetic device. Both these devices act mechanically on the trip mechanism.
  • Why we use Mccb instead of MCB?
    If evaluated from their power capacities, the MCB is essentially used for low-current requirements, such as, home wiring or small electronic circuits; while the MCCB is better used for high-power requirements. Type of electrical switch which protects the circuit from overload or short circuit.

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