General rules for choosing MCB
a. Technical data of the network at the point considered: The earthing systems, short-circuit current at the circuit breaker installation point, which must always be less than the breaking capacity of this device, network normal voltage.
b. There are 3 curve characteristics for magnetic operation: B curve(3-5 In) protection and control of the circuits against length cables in TN and IT systems.
C curve(5-10 In) protection and control of the circuits against overloads and short-circuits; protection for resistive and inductive loads with low inrush current.
Dcurve(10-20 In) protection and control of the circuits against overloads and short-circuits; protection for circuits which supply loads with high inrush current at the circuit closing(LV/LV transformers, breakdown lamps).
| standard |
| IEC/EN60898-1 |
| Electrical
features | Rated current In | A | 1,2,4,6,10,16,20,25,32,40,50,63 |
Poles | P | 1,2,3.4 |
Rated voltage Ue | V | AC 240/415 |
Insulation voltage Ui | V | 500 |
Rated frequency | HZ | 50/60 |
Rated breaking capacity | A | 3000,4500(2~40A/6000) |
Rated impulse withstand voltage(1.2/50) Uimp | V | 4000 |
Dielectric test voltage at ind. Freq. for 1min | KV | 2 |
Pollution degree |
| 2 |
Thermo-magnetic release characteristic |
| B,C,D |
| Mechanicalfeatures | Electrical life | t | 4000 |
Mechanical life | t | 10000 |
Protection degree |
| IP20 |
Reference temperature for setting of thermal element | ℃ | 30 |
| Ambient temperature(with daily average ≤35℃) | ℃ | -5~+40(Special application please refer to temperature compensation correction) |
Storage temperature | ℃ | -25~+70 |
Installation | Terminal connection type |
| Cable/Pin-type busbar |
Terminal size top/bottom for cable | Mm²/AWG | 25/18-3 |
Terminal size top/bottom for busbar | Mm²/AWG | 25/18-3 |
Tightening torque | N*m/ ln-lbs | 2/18 |
Mounting |
| On DIN rail EN 60715(35mm) by means of fast clip device |
Connection |
| From top and bottom |
