RDB8DC series circuit breaker is a circuit breaker product with high curent limiting ability and high reliability,which is specially developed for the communication industry.It is mainly used for power distribution systems such as main cabinets, power supply cabinets, distribution cabinets,and outdoor cabinets in the communications industry.
| RDB8DC | 63 | 6 | 2 | C | 63 | OF |
| Product code | Shell level | Breaking capacity | Number of poles | Trip mode | Rated voltage | Electric attachments |
| DC miniature circuit breaker |
63 | 6KA 10KA |
1P 2P 3P 4P |
C D |
1P:DC125V/250V 2P:DC250V/500V 3P:DC300V/750V 4P:DC500V/1000V |
Auxiliary contact:OF Alarm contact:SD |
● The upper limit of ambient air temperature shall not exceed +40℃, the lower limit shall not be lower than -5℃, and the average temperature of 24h shall not exceed +35°C;
● The elevation of the installation site should not exceed 2000m;
● The relative humidity of the atmosphere does not exceed 50% when the ambient air temperature is + 40℃, and a higher relative humidity is lowed at a lower temperature.For example, 90% at +20℃. Special measures should be taken for condensation that occasionally occurs on the product due to temperature changes;
● When wiring,the correct pole of the power supply must be connected to the positive pole of the circuit breaker,and the negative extreme must be connected to the negative pole of the circuit breaker.Reverse connection is not allowed;
● Pollution level: Level 2;
● Installation conditions: Installed in a place without significant impact, vibration, and in a medium without danger (explosion);
● Installation method: Using TH35-7.5 mounting rail;
● Installation category:ClassⅡ,ClassⅢ.
☐ According to the number of poles:1P,2P,3P4P;
☐ According to the instantaneous tripping current form:Type C ( 8ln±20%),Type D(12In±20%);
☐ According to the rated current:6A,10A,16A,20A,25A,32A,40A,50A and 63A;
☐ According to the rated operating voltage:125V/250V DC(1P) , 250V/500V DC(2P) , 300V/750V DC(3P) , 500V/1000V DC(4P).
● Overcurrent trip characteristics When the circuit breakeris installed under normal conditions and the ambient temperature (30-35℃),the overcurrent trip characteristics comply with the provisions of Table 1.
● The rated short-circuit breaking capacity of the circuit breaker is shown in Table 2.
| Trip type(Table 2) | Test current In | Appointed time | Expected result | Initial state | Annotation |
| Type C | 8In×80% | t≤0.2s | Non-trip | Cold State | Close the auxiliary switch and turn on the power |
| 8In×120% | t<0.2s | trip | |||
| Type D | 12In×80% | t≤0.2s | Non-trip | ||
| 12In×120% | t<0.2s | trip | |||
| Type C/D | 1.05In | t≤1h | Non-trip | Cold State | ------ |
| 1.3In | t<1h | trip | Hot state | The current rises to the specified value within 5S |
| Trip type(Table 2) | Rated current A | Rated short-circuit breaking capacity |
| Type C/D | 6≤In≤63 | 6000(1P 250V、2P 500V、3P750V、4P 1000V) 10000(1P 125V、2P250V、3P 300V、4P 500V) |
Mechanical electrical life:
Circuit breaker under the specified rated voltage, switch on and break the rated current,power factor is 0.85 ~0.9, operating cyde 120 times per hour(>32A) or 240 times (≤32A) frequency test, its mechanical and electrical life is 10000 times, electrical life DC 1500 times.
Structure:
The circuit breaker consists of contact system,arc extinguishing system, electromagnetic system,tripping mechanism, operating mechanism and housing.
Working principle:
Under normal working conditions, pull the operating mechanism, at this time the release mechanism is locked, and the dynamic and static contacts contact to make the power connected.
When the line is overloaded, the bimetal sheet of the electromagnetic system produces deformation, pushes the lock to release the mechanism, and moves the contact to disconnect and cut off the power supply. When the circuit is short-circuited,the electromagnetic system draws the iron core,and the iron core top rod pushes the lock to make the mechanism release, completing the breaking protection function of the circuit breaker.
Outline dimensions and installation dimensions of the circuit breaker are shown in Figure1.
| Size | 1P | 2P | 3P | 4P |
| L(mm) | 18⁰₋₀.₅ | 36⁰₋₁.₀ | 54⁰₋₁.₅ | 72⁰₋₂.₀ |
