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10A/16A/32A/50A/63A 1P DC Miniature Circuit Breaker FAQ

How to choose a suitable circuit breaker?
 
For controller/inverter/DC device
  1. Determine the maximum continuous operating current=watt/voltage.
  2. Maximum current = 1.25 x maximum continuous operating current.
  3. Select the circuit breaker whose rated current is greater than and closest to the maximum current.
For solar panel:
  1. Determine short-circuit current.
  2. Maximum current = Short-circuit current x 1.25 x 1.25.
  3. Select the circuit breaker whose rated current is greater than and closest to the maximum current.
What is the difference between 1P and 2P circuit breaker?
 
  1. 1P connects on the live wire only.
  2. 2P connects on both live wire and neutral wire, so it can cut them at the same time.
  3. Normally, 2P can afford greater rated current and working voltage than 1P.
What size wire will it accept?
 
  • Circuit breaker:
    • Functions: overload/short circuit protection and active disconnection can be realized.
    • Breaking time: small current delay trip, large current instant trip.
    • Rated operating voltage: 250V/1000V
    • Replacement: after disconnecting, only reset is required, don't need to replace it.
  • Fuse:
    • Function: overload/short circuit protection only.
    • Breaking time: high current also has delay.
    • Rated operating voltage: 72V
    • Replacement: Replacement is required immediately after breaking.