Description

Swan-Electric/Suntree 40A DC Breaker 4Pole

40A DC Breaker 4P Specification Sheets:

Swan-Electric/Suntree 40A DC Breaker 4P:

Swan-Electric/Suntree – 40A 4P DC Breakers – Data Sheet

What is a DC Circuit Breaker?

• A DC circuit breaker is an electrical breaker that interrupts electricity flow.
• This helps prevent fires or damage to other devices using the same power supply.
• DC breakers are essential for any application requiring protection against the direct current.
• They serve to stop that current in case of an outage or other emergency situation.

Applications of DC Circuit Breakers

• A typical circuit breaker design consists of two main contacts and a set of breaking or arcing contacts.
• When the main contacts separate, there are various methods for extinguishing the arc depending on the circuit breaker’s design and the type of insulating or dielectric medium used.
• Usually, this involves cooling down the arc and recombination of ionized air molecules back into their original states.
  

  How do I choose a DC circuit breaker?

  Identify the system voltage:

  • Determine the operating voltage of your DC system. Common DC voltages include 12V, 24V, 48V, 110V, 220V, and higher, especially in industrial and renewable energy applications.

  Determine the application type:

  • Consider whether the breaker is for residential, commercial, industrial, or renewable energy applications (such as solar PV systems).

  Determine the Current Rating

  Calculate the full-load current

  • Add up the total current draw of all the devices connected to the circuit.
  • This will give you the full-load current.

  Select a breaker rating:

  • Choose a breaker with a current rating that is 125% to 150% of the full-load current.
  • This provides a safety margin and helps prevent nuisance tripping.

  Interrupting Capacity

  Check the interrupting rating:

  • Ensure the circuit breaker can safely interrupt the maximum fault current that could occur in your system.
  • The interrupting capacity should be higher than the maximum short-circuit current of the system.

  Trip Curve and Characteristics

  Ambient temperature:

  • Consider the operating environment.
  • High temperatures can affect the performance of circuit breakers.
  • Choose a breaker that can operate reliably within the temperature range of the application.

  Enclosure and mounting:

  • Decide on the type of enclosure (e.g., NEMA or IP rating) if the breaker will be used in a harsh environment.
  • Also, consider the mounting type (panel mount, DIN rail, etc.).

  DC-specific characteristics

  • Make sure the breaker is specifically rated for DC applications, as AC and DC circuit breakers have different arc-extinguishing mechanisms.