ONESTO KCMD3 series high-voltage DC molded case circuit breaker (models include 200/250/320/400/630/800) is a protection device designed for DC high-voltage scenarios, supporting 2P/3P configuration, rated voltage covering DC250V-1500V, current up to 800A, with 12kV impulse withstand voltage and passed IEC 60947-2 certification. Its IP20 protection level and wide temperature adaptability from -30°C to +70°C make it widely used in photovoltaic power station string protection, energy storage system battery array isolation, rail transit DC traction power supply and data center high-voltage DC distribution and other scenarios, especially suitable for industrial environments that require high-reliability DC disconnection.
| Type | KCMD3-250 | KCMD3-320 | KCMD3-400 | ||||
| Rated current of shell frame grade Inm(A) | 320 | 320 | 400 | ||||
| Rated current In(A) | 125A, 140A, 160A, 180A, 200A, 225A, 250A | 280A, 315A, 320A | 250A, 280A, 315A, 320A, 350A, 400A | ||||
| Pole Number | 2 | 3 | 2 | 3 | |||
| Rated working voltage Ue (V)DC | 250V 500V | 750V 1000V | 1250V,1000V 1500V | 250V 500V | 750V 1000V | 1250V 1500V | 1500V |
| Rated insulation voltage Ui(V) | 1250V DC | 1500V DC | 1500V DC | ||||
| Rated impulse withstand voltage Uimp(kV) | 8kV | 12kV | 12kV | ||||
| Extreme short-circuit (H Type) breaking capacity Icu(kA) (R Type) | 40kA | 20kA | 20kA | 65kA | 35kA | 15kA | 20kA |
| / | / | / | 70kA | 40kA | 20kA | 25kA | |
| Running short-circuit (H Type) breaking capacity Ics (kA) (R Type) | 40kA | 20kA | 20kA | 65kA | 35kA | 15kA | 20kA |
| / | / | / | 70kA | 40kA | 20kA | 25kA | |
| Mechanical life (Total times) | 20000 | 10000 | |||||
| Electrical life (Total times) | 3000 | 2000 | 1500 | 1000 | 700 | 500 | |
| Insolation feature | Yes | ||||||
| Standard | IEC 60947-2 | ||||||
| Allowable ambient temperature | -35~+70℃ | ||||||
| Levels of protection | IP20 | ||||||
| Quality certificate | TUV, CE certificate | ||||||
| With accessories | Auxiliary, alram, off load, Hand operation, Electric operation | ||||||
| Arcing distance (mm) | ≤70（Zero arc, with arcing cover） | ||||||
| Transient Action value | 10In | ||||||
| Dimension(mm) W×L×D | 76×180×126mm | 107(W) | 124×250×166mm | 182(W) | |||
| Type | KCMD3-630 | KCMD3-800 | ||||||
| Rated current of shell frame grade Inm(A) | 630 | 800 | ||||||
| Rated current In(A) | 450A, 500A, 630A | 700A, 800A | ||||||
| Pole Number | 2 | 3 | 2 | 3 | ||||
| Rated working voltage Ue (V) DC | 250V 500V | 750V 1000V | 1250V 1500V | 1500V | 250V 500V | 750V 1000V | 1250V 1500V | 1500V |
| Rated insulation voltage Ui (V) | 1500V DC | 1500V DC | ||||||
| Rated impulse withstand voltage Uimp(kV) | 12 KV | 12kV | ||||||
| Extreme short-circuit (H Type) breaking capacity Icu(kA) (R Type) | 65kA | 35kA | 15kA | 20kA | 65kA | 35kA | 15kA | 20kA |
| 70kA | 40kA | 20kA | 25kA | 70kA | 40kA | 20kA | 25kA | |
| Running short-circuit (H Type) breaking capacity Ics (kA) (R Type) | 65kA | 35kA | 15kA | 20kA | 65kA | 35kA | 15kA | 20kA |
| 70kA | 40kA | 20kA | 25kA | 70kA | 40kA | 20kA | 25kA | |
| Mechanical life (Total times) | 5000 | |||||||
| Electrical life (Total times) | 1000 | 700 | 500 | 1000 | 700 | 500 | ||
| Isolation feature | Yes | |||||||
| Standard | IEC 60947-2 | |||||||
| Allowable amibient temperature | -35~+70℃ | |||||||
| Levels of protection | IP20 | |||||||
| Quality certificate | TUV, CE certificate | |||||||
| With accessories | Auxiliary, alram, off load, Hand operation, Electric operation | |||||||
| Arcing distance (mm) | ≤70（Zero arc, with arcing cover） | |||||||
| Transient Action value | 10In | |||||||
| Dimension(mm) W×L×D | 124×250×166mm | 182(W) | 124×250×166mm | 182(W) | ||||
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