1.1 Function
protection of circuits against short-circuit currents, protection of circuits against overload currents, switch, isolation.
1.2 Selection
Technical data of the network at the point considered: the earthing systems (TNS, TNC), short-circuit current at the circuit-breaker installation point, which must always be less than the breaking capacity of this device, and network normal voltage.
Tripping curves:
B curve (3-5In)
protection for people and big length cables in TN and IT
systems.
C curve (5-10In)
protection for resistive and inductive loads with low inrush current.
D curve(10-20In)
protection for circuits which supply loads with high inrush current at the circuit closing
(LV/LV transformers, breakdown lamps).
1.3 Approvals and certificates
For detailed information, please refer to the below link: