Chint Moulded Case Circuit Breaker 3 Pole (NXM-125 S) 80,100 Amp

Rs 19,400.00

Available ampere (must write any one in additional information/order notes)

  • 80 Amp
  • 100 Amp
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Product: MCCB (moulded case circuit breaker) 3 pole

Brand: Chint

Model: NXM-125 S

Number of pole: 3

Rated Current: optional 80, 100 (must write)

Frequency: 50/60 Hz

Rated Short-Circuit Breaking Capacity: 25 kA (25000A)

Mounting: with screw

Mounting mode: vertical or horizontal

Type: fixed

Certificates: KEMA, ESC, UKrSEPRO, PCT, RCC, KC

Standard: IEC/EN 60947-2


  • This 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.
  • With a current rating of up to 2500A,
  • MCCBs are used mostly in industrial areas on high voltage and heavy duty machinery.
  • These breakers are used instead of miniature circuit breakers (MCBs) in large scale PV systems for system isolation and protection purposes.
  • The MCCB uses a temperature sensitive device (the thermal element) with a current sensitive electromagnetic device (the magnetic element) to provide the trip mechanism for protection and isolation purposes.
  • This enables the MCCB to provide:
    • Overload Protection,
    • Electrical Fault Protection against short circuit currents, and
    • Electrical Switch for disconnection.


  • MCCBs in an electrical circuit should be sized according to the circuits expected operating current and possible fault currents.
  • The three main criteria while selecting MCCBs are:
    • The rated working voltage (Ue) of the MCCB should be similar to the system voltage.
    • The trip value of the MCCB should be adjusted according to the current drawn by the load.
    • The breaking capacity of the MCCB must be higher than the theoretical possible fault currents.

Purpose of trip Button

  • This test is conducted by testing the response of the MCCB under simulated over-current and fault conditions.
  • Thermal protection of the MCCB is tested by running a large current through the MCCB (300% of rated value).
  • If the breaker fails to trip, it is an indication of failure of thermal protection.
  • The test for magnetic protection is conducted by running short pulses of very high current.
  • Under normal conditions, magnetic protection is instant.
  • This test should be conducted at the very end as high currents increase the temperature of contacts and insulation, and this may alter the results of other two tests.


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