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EKM8DC series DC moulded-case circuit breaker (hereinafter referred to as circuit breaker) is suitable for DC systems of rated voltage up to and including DC 1000V and rated current 10~800A, used to distribute electric power energy, protect circuits and power equipment against overload, short circuit and so on.
| EKM8DC | 125 | H | 2 | 2 |
| ↓ | ↓ | ↓ | ↓ | ↓ |
| Product code | Frame size rated current | Rated ultimate short-circuit breaking capacity | Pole number | Release type |
| DC circuit breaker | 125, 160, 250,400, 800 | H: higher level type | 2:2-pole 3:3-pole 4:4-pole |
2-short-circuit release 3-complex release |
| EKM8DC | 125 | H | 2 |
| ↓ | ↓ | ↓ | ↓ |
| Accessory | Rated operating voltage | External accessory | Wiring method |
| 0: No 2: Auxiliary contact 3: Complex release |
DC 500V-1000V | Null: body operation P: electric operation GZ3: rotary handle |
Null: front-board wiring B: back-board wiring C: plug-in type |
| Frame current (A) | 125 | 160 | 250 | |
| Model | EKM8DС-125H | EKM8DС-160H | EKM8DС-250H | |
| Pole number | 2,3, 4 | 2,3, 4 | 2,3, 4 | |
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| Rated current (A) | 10,16, 20, 25, 32, 40, 50,63, 80, 100, 125 | 10, 16, 20, 25, 32, 40, 50,63,80, 100, 125, 140, 160 | 100,125,140,160,180, 200, 225, 250 | |
| Rated voltage (V) | DC250V, DC500V DC750, DC1000V | DC250V, DC500V DC750, DC1000V | DC250V, DC500V DC750, DC1000V | |
| Rated insulation voltage (V) | DC1000V | DC1000V | DC1000V | |
| Short-circuit breaking capacity (KA) Icu (Ics=70%Icu) | 250VDC (35KA),500VDC (25KA) DC750V(15kA), DC1000V(10kA) | |||
| Operating cycle number | Electrical life | 6000 | 3000 | 3000 |
| Mechanical life | 9000 | 7000 | 7000 | |
|
Outline dim(mm)
|
2P | 50-130-68-90 | 60-155-88-115 | - |
| 3P | 75-130-68-90 | 90-155-88-115 | 105-165-88-115 | |
| 4P | 100-130-68-90 | 120-155-88-115 | 140-165-88-115 | |
| Weight (kg) | 2P | 0.55 | 1 | - |
| 3P | 0.65 | 1.1 | 1.5 | |
| 4P | 0.8 | 1.4 | 1.9 | |
| Electric operating device (MD) | ● | |||
| External driving operating handle | ● | |||
| Automatic release | Thermal electromagnetic type | |||
| Frame current (A) | 400 | 800 | |
| Model | EKM8DС-400M | EKM8DС-800H | |
| Pole number | 2,3, 4 | 2,3, 4 | |
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| Rated current (A) | 250,315, 350, 400, 630 | 500, 630, 700, 800 | |
| Rated voltage (V) | DC250V, DC500V DC750, DC1000V | ||
| Rated insulation voltage (V) | DC1000V | DC1000V | |
| Short-circuit breaking capacity (KA) Icu (Ics=70%Icu) | 250VDC (35KA),500VDC (25KA) DC750V(15kA),DC1000V(10kA) | ||
| Operating cycle number | ON | 2000 | 1500 |
| OFF | 4000 | 4000 | |
| Outline dim(mm) a-b-c-ca   |
2P | 140-257-103-155 | 210-275-103-155 |
| 3P | 140-257-103-155 | 210-275-103-155 | |
| 4P | 184-257-103-155 | 280-275-103-155 | |
| Weight (kg) | 2P | 5 | 9.5 |
| 3P | 5.7 | 12.5 | |
| 4P | 7.5 | 1.4 | |
| Electric operating device (MD) | ● | ||
| External driving operating handle | ● | ||
| Automatic release | Thermal electromagnetic type | ||
DC System Protection
| System type | Grounding system | Ungroun ed system | ||
| Various types of reformation | One pole of DC power is grounded | Neutral point of DC power is grounded | ||
| Fault A | Max. Isc that only to the positive pole | Isc is close to max. Isc and only to the positive pole, voltage is U/2 | No effect | |
| Fault effect | Fault B | Max. Isc that includes two poles | Max. Isc that includes two poles | Max. Isc that includes two poles |
| Fault C | No Effect | Same as fault A but only to the negative pole | No effect | |
| The most serious situation | Fault A | Faults A and C | Fault B | |
| Pole breaking | It can be connected at the positive in series, and commonly execute the breaking | At each pole, they must be at U/2 | The two poles to be disconnected are evenly distributed between the two electrodes | |
Wiring Method
| Un＜250V |   |
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| Un＜800V |   |
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| Un＜1000V |   |
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EKM8DC series DC moulded-case circuit breaker (hereinafter referred to as circuit breaker) is suitable for DC systems of rated voltage up to and including DC 1000V and rated current 10~800A, used to distribute electric power energy, protect circuits and power equipment against overload, short circuit and so on.
| EKM8DC | 125 | H | 2 | 2 |
| ↓ | ↓ | ↓ | ↓ | ↓ |
| Product code | Frame size rated current | Rated ultimate short-circuit breaking capacity | Pole number | Release type |
| DC circuit breaker | 125, 160, 250,400, 800 | H: higher level type | 2:2-pole 3:3-pole 4:4-pole |
2-short-circuit release 3-complex release |
| EKM8DC | 125 | H | 2 |
| ↓ | ↓ | ↓ | ↓ |
| Accessory | Rated operating voltage | External accessory | Wiring method |
| 0: No 2: Auxiliary contact 3: Complex release |
DC 500V-1000V | Null: body operation P: electric operation GZ3: rotary handle |
Null: front-board wiring B: back-board wiring C: plug-in type |
