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Miniature Circuit Breaker is the latest product developed by our company. This series of products have complete specifications and the max rated current can reach 63A.
| Electrical Features | Rated current In | 6,10,16,20,25,32,40,50,63A |
Poles | 1P, 2P, 3P,4P | |
Rated voltage Ue | 240/415V~ | |
Insulation voltage Ui | 500V | |
Rated frequency | 50/60Hz | |
Rated breaking capacity | 6,000A | |
Energy limiting class | 3 | |
Rated impulse withstand voltage(1.5/50) Uimp | 4,000V | |
Dielectric test voltage at ind. Freq. for 1 min | 2kV | |
Pollution degree | 2 | |
Thermo-magnetic release characteristic | B, C, D | |
| Mechanical Features | Electrical life | 8,000 Cycles |
| Mechanical life | 20,000 Cycles | |
| Contact position indicator | Yes | |
| Protection degree | IP20 | |
| Reference temperature for setting of thermal elements | 30℃ | |
| Ambient temperature (with daily average≤35℃) | -5℃~+40℃ | |
| Storage temperature | -25℃~+70℃ | |
| Installation | Terminal connection type | Cable/Pin-type busbar/U-type busbar |
| Terminal size top/bottom for cable | 25mm2 18-3AWG | |
| Terminal size top/bottom for busbar | 25mm2 18-3AWG | |
| Tightening torque | 2.5Nm 22In-Ibs | |
| Mounting | Mounting on DIN rail EN60715(35mm) by means of fast clip device | |
| Connection | Power supply in both directions |
MCB Characteristics Curves
Thermal Tripping | Magnetic Tripping | |||||
Asper IEC60898 | No tripping current | Tripping current I2 | Time Limits t | Hold current I4 | Trip current I5 | Time Limits t |
B Curve | 1.13×IN | ≥1h | 3×IN | ≥0.1s | ||
1.45×IN | ＜1h | 5×IN | ＜0.1s | |||
C Curve | 1.13×IN | ≥1h | 5×IN | ≥0.1s | ||
| 1.45×IN | ＜1h | 10×IN | ＜0.1s | |||
D Curve | 1.13×IN | ≥1h | 10×IN | ≥0.1s | ||
| 1.45×IN | ＜1h | 20×IN | ＜0.1s | |||
Based on the Tripping Characteristics, MCB are available in “B”, “C” and “D” curve to suit different types of applications.
“B” Curve for protection of electrical circuits with equipment that does not cause surge current (lighting and distribution circuits) Short circuit release is set to (3-5) In.
“C” Curve for protection of electrical circuits with equipment that cause surge current (inductive loads and motor circuits) Short circuit release is set to (5-10) In.
“D” Curve for protection of electrical circuits with cause high inrush current, typically 12-15 times the thermal rated current (transforms, x-ray machines etc,) Short circuit release is set to (10-20) In.
