1P, 1P + N and 2P circuit breakers are used for single-phase power control and protection circuit, then what is the difference between them, apply effects exactly what difference will it make?

• 1P, 1P + N and 2P breaker defined
  • A, 1P breaker - single-pole circuit breaker having a thermal trip function, only the control wire (line), modulus 18mm;
  • B, 1P + N circuit breaker - + N single-pole circuit breakers, while controlling the hot, neutral, with only FireWire thermal trip function; modulus 18mm;
  • C, the circuit breaker 2P - 2-pole circuit breaker, while controlling the hot, neutral, each have a thermal trip function, the modulus is 2 * 18mm = 36mm;
• 1P, 1P + N and 2P disconnection an application
  • A, 1P breaker application: the total economic cost viewpoint, as having superior leakage breaker tripping function, and at least into the line (or line on a level) with leakage circuit breaker , the choice 1P breaker shall suffice, cut off the power when the superior attention to maintenance, to prevent the hot, neutral confusion caused by the accident.
  • B, 1P + application N (i.e. DPN) of the circuit breaker: To avoid the problems encountered encountered 1P breaker overhaul.
  • C, the application of the circuit breaker 2P: same as for the modulus and in terms of 18mm 1P 1P + N circuit breaker, since the important influence of space, a short-circuit accident in the former state "ultimate breaking capacity" certainly be higher than the latter. Similarly, for some important applications, such as frequent maintenance operation or failure prone electrical circuit, the circuit breaker is best choice 2P (higher cost).