High-Rating Circuit Breakers: Functions, Features, and Importance

Electrical
1

An explanation of high rating circuit breaker main information:

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  1. Draw-out DMX³: Indicates the circuit breaker is of a draw-out type, allowing for easy removal or insertion from the switchgear for maintenance or testing.

  2. Key locking in “Open” position: Prevents unauthorized operation by locking the breaker in the open (off) state.

  3. Open control button: Used to manually open (turn off) the circuit breaker.

  4. MP4 LSIG tripping unit: A protection module that monitors and trips the circuit breaker during electrical faults like overcurrent, short circuits, or ground faults.

  5. Reset button: Used to reset the breaker after it trips due to a fault.

  6. Indicator showing the position of the main contacts (0/1): Displays whether the circuit breaker is open (0) or closed (1).

  7. Device position indicator: Shows the current position of the circuit breaker:

  • Plugged in: Connected to the system.

  • Test: In testing mode.

  • Drawn-out: Removed from the system.

  1. Isolator terminal blocks for auxiliary contacts: Provides connections for auxiliary signaling devices or control circuits.

  2. Windows for displaying auxiliary equipment: Allows visibility of any auxiliary equipment associated with the circuit breaker.

  3. Close control button: Used to manually close (turn on) the circuit breaker.

  4. Color marking for breaking capacity:

  • Grey for DMX³ N.

  • Yellow for DMX³ H.

  • Red for DMX³ L.

  • These indicate different ratings or capacities of the breaker.

  1. Indicator showing the load status of springs (Charged/Discharged): Shows whether the spring mechanism used for closing the breaker is ready (charged) or needs recharging (discharged).

  2. Spring loading lever: A lever to manually charge the spring mechanism.

  3. Key locking in draw-out position: Locks the breaker in the draw-out position to prevent unauthorized removal or insertion.

  4. Lockable aperture for insertion of the extraction handle: A secure point for attaching a handle used to draw out or insert the breaker.

This equipment is typically used in industrial or commercial electrical installations to ensure safe and efficient power distribution while offering protection and ease of maintenance.