Circuit breaker category

A circuit breaker is an essential component in electrical systems, and it's categorized based on various factors. Here are some common categories:

  1. Type: Circuit breakers are classified into two main types:
    • Molded Case Circuit Breakers (MCCBs): These are the most common type, used in commercial and industrial applications. They have a molded plastic case and are available in various sizes and ratings.
    • Air Circuit Breakers (ACBs): These are used in high-voltage applications (above 1 kV) and are designed to operate in air.
  2. Voltage Rating: Circuit breakers are categorized based on their voltage rating:
    • Low-Voltage (LV): Up to 1 kV (e.g., 120V, 240V, 480V)
    • Medium-Voltage (MV): 1 kV to 35 kV
    • High-Voltage (HV): Above 35 kV
  3. Current Rating: Circuit breakers are categorized based on their current rating:
    • Low-Current: Up to 20 A
    • Medium-Current: 20 A to 100 A
    • High-Current: Above 100 A
  4. Arc Fault Protection: Some circuit breakers are designed to detect and interrupt arc faults, which can cause fires:
    • Arc Fault Circuit Interrupters (AFCIs): Designed to detect and interrupt arc faults in branch circuits.
    • Combination Arc Fault Circuit Interrupters (CAFCIs): Combine AFCI and ground fault circuit interrupter (GFCI) functionality.
  5. Ground Fault Protection: Circuit breakers can be categorized based on their ground fault protection capabilities:
    • Ground Fault Circuit Interrupters (GFCIs): Designed to detect and interrupt ground faults in branch circuits.
    • Ground Fault Sensing (GFS): Some circuit breakers can detect ground faults but do not interrupt the circuit.
  6. Certifications and Standards: Circuit breakers may be certified to various standards and regulations, such as:
    • UL (Underwriters Laboratories): Meets UL standards for safety and performance.
    • IEC (International Electrotechnical Commission): Meets IEC standards for safety and performance.
    • NFPA (National Fire Protection Association): Meets NFPA standards for fire safety and prevention.

These categories are not exhaustive, and circuit breakers may be further categorized based on specific applications, features, or technologies.