MCB Specifications and Standards

• Miniature circuit breakers with high rated current capacity are important electrical protection devices.

  1. General function

  • They are designed to protect electrical circuits from overcurrent. When the current flowing through the circuit exceeds the rated current capacity of the breaker, it will automatically trip to cut off the circuit, preventing damage to electrical equipment and potential safety hazards such as electrical fires.

  2. Characteristics related to high rated current capacity

  • High - rated current capacity means that they can handle relatively large currents. For example, in some industrial applications or large - power electrical systems in buildings, these miniature circuit breakers can be used to protect circuits with high power consumption. They are able to carry a significant amount of current without tripping under normal operating conditions.
  • Despite their relatively small size (compared to larger circuit breakers used in high - voltage and extremely high - power applications), they are highly efficient in handling high - current situations. This compactness makes them suitable for installation in electrical distribution boards where space may be limited.

  3. Design and construction

  • Inside the miniature circuit breaker, there are precise mechanisms. These include a bimetallic strip which can sense the heat generated by excessive current. When the current is too high, the bimetallic strip bends and triggers the tripping mechanism. Some high - rated current capacity miniature circuit breakers may also incorporate advanced magnetic components to enhance their performance in detecting and responding to overcurrent situations more quickly and accurately.

  4. Applications

  • They are widely used in various electrical systems. In commercial buildings, they can protect the circuits of air - conditioning systems, elevators, and large lighting arrays. In industrial plants, they are used to safeguard the circuits of machinery, motors, and production lines. Additionally, in residential applications, although the power consumption is relatively lower compared to industrial and commercial settings, high - rated current capacity miniature circuit breakers can be used for circuits with high - power appliances such as electric heaters or electric stoves.
  
  Technical Parameter
  

  DZ47-125DC Series Circuit Breaker		DZ47-125DC
  Frame Degree Rated Current (A)		125A
  Pole		IP, 2P, 3R 4P
  Rated Operating Voltage (VDC)		lP250\42P500\43P750\44P1000V
  Rated Current In (A)		1,2,3,4,6,10,16,20,25,32,40,50,63，80,100,125
  Rated Insulation Voltage Ui (VDC)		1200VDC
  Rated Impact Voltage Uimp (kV)		4kV
  Ultimate Breaking Capacity leu (kA)		4.5kA/6kA
  Run Breaking Capacity les (%lcu)		75%
  Curve Type		C
  Trip Type		Thermal-magnetic
  Mechanical Life	Actual Average Value	20000
  	Standard Value	8500
  Electric Life	Actual Average Value	6000
  	Standard Value	2500

  Wiring Capacity (mm2)		32A, 1~25 mm2J^40A, 10~35mm2
  Ambient Temperature (*C)		-20-+70
  Altitude		^2000
  Relative Humidity		W95%
  Pollution Level		3
  Installation Environment		No obvious shock and vibration
  Installation Category		Class III
  Installation		DIN Standard rail
  Dimensions(W)x(H)x(Deep)	W	18	36	54	72
  	H	80	80	80	80
  	c	71	71	71	71
  Weight (kg)		0.12	0.24	0.36	0.48

  Wiring diagram
  

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