How to choose a suitable circuit breaker?
For controller/inverter/DC device
- Determine the maximum continuous operating current=watt/voltage.
- Maximum current = 1.25 x maximum continuous operating current.
- Select the circuit breaker whose rated current is greater than and closest to the maximum current.
- Determine short-circuit current.
- Maximum current = Short-circuit current x 1.25 x 1.25.
- 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?
- 1P connects on the live wire only.
- 2P connects on both live wire and neutral wire, so it can cut them at the same time.
- 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.