Air Circuit Breaker DW45 SERIES
DW45 series air circuit breaker is applicable for distribution network of AC 50Hz, rated voltage of 400V and 690V, and rated current of 630A~6300A, to distribute electric energy protection circuit and prevent power equipments from harm of overload, under-voltage, short circuit and single-phase earth etc.
Application
DW45 series air circuit breaker is applicable for distribution network of AC 50Hz, rated voltage of 400V and 690V, and rated current of 630A~6300A, to distribute electric energy protection circuit and prevent power equipments from harm of overload, under-voltage, short circuit and single-phase earth etc. Provided with intelligent protecting function and precise selective protection, breaker can enhance the dependability of power supply and avoid unwanted power cut.
Circuit Breaker Rated Current
| Frame Size Rated Current Inm(A) | Rated Current In A |
|---|---|
| 2000 | 400, 630, 800, 1000, 1250, 1600, 2000 |
| 3200 | 2000, 2500, 2900, 3200 |
| 4000 | 3200, 3600, 4000 |
| 6300 | 4000, 5000, 6300 |
Circuit breaker rated short-circuit breaking capacity and rated short-time withstand current, Arcing-over distance is zero.
| Item | Voltage | 2000 | 3200 | 4000 | 6300 |
|---|---|---|---|---|---|
| Rated limit short-circuit breaking capacity Icu(KA)O-CO | 400V | 85 | 100 | 100 | 120 |
| Rated limit short-circuit breaking capacity Icu(KA)O-CO | 690V | 50 | 65 | 65 | 80 |
| Rated short-circuit breaking capacity N x Icu(KA)/cos x ø | 400V | 176/0.2 | 220/0.2 | 220/0.2 | 264/0.2 |
| Rated short-circuit breaking capacity N x Icu(KA)/cos x ø | 690V | 105/0.25 | 143/0.2 | 143/0.2 | 187/0.2 |
| Rated operating short-circuit breaking capacity Icu(KA)O-CO | 400V | 50 | 65 | 65 | 80 |
| Rated operating short-circuit breaking capacity Icu(KA)O-CO | 690V | 40 | 50 | 50 | 70 |
| Rated operating short-circuit breaking capacity Icu(KA)O-CO | 400V | 50 | 65 | 65/80(MCR) | 85/110(MCR) |
| Rated operating short-circuit breaking capacity Icu(KA)O-CO | 690V | 40 | 50 | 50/65(MCR) | 65/75(MCR) |
Note: Last hour line and next enter line of breaking capacity in the table are the same.
Rated Continuous Current Under Different Conditions
Largest loss-power of the breaker is 360W. Breaker’s rated continuous current changes under different conditions.
| Temperature °C | 400A | 630A | 800A | 1000A | 1250A | 1600A | 2000A |
|---|---|---|---|---|---|---|---|
| 40 | 400A | 630A | 800A | 1000A | 1250A | 1600A | 2000A |
| 50 | 400A | 630A | 800A | 1000A | 1250A | 1550A | 1900A |
| 60 | 400A | 630A | 800A | 1000A | 1250A | 1550A | 1800A |
Intelligent Over-Current Controller Protection Characteristic and Function
Over-current controller protection feature
a. Controller’s setting value Ir(I/In) and accuracy
| Protection Type | Setting / Range | Accuracy / Condition |
|---|---|---|
| Long-delay Ir1 | (0.4-1) In | — |
| Short-delay Ir2 | (0.4-15) In | ±10% |
| Instantaneous Ir3 | In~50KA (Inm=200A); In~75KA (Inm=3200~4000A); In~100KA (Inm=6300A) | ±15% |
| Earthing fault | Inm=2000~4000A: (0.2~0.8)In, Max. 1200A, Min.160A | ±10% |
| Earthing fault | Inm=6300A: (0.2-1.0)In | ±10% |
Note: When required three-section protection at the same time, setting values can’t intercross.
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