Product Introduction
The BSB C8P-350A high voltage DC contactor is designed for demanding applications in photovoltaic (PV) and energy storage systems (ESS). With a ceramic-sealed, gas-filled chamber, it ensures long-lasting, arc-free switching. Rated for 350A continuous current and up to 1500VDC operation, this contactor provides safe and efficient power switching for large-scale PV arrays, battery disconnects, and inverter-side applications.
Product Features
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High Voltage Capability: Rated up to 1500VDC for use in high-power PV and ESS systems.
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High Current Handling: 350A continuous current and 2000A peak breaking capacity at 1000VDC.
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Ceramic Sealed Design: Provides superior insulation and arc suppression, ensuring reliable operation in harsh environments.
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Fast Response Time: Operate time ≤30ms, release time ≤10ms, and bounce time ≤5ms for swift and efficient switching.
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Auxiliary Contact Option: 1 Form A auxiliary contact for feedback or safety loop integration.
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Robust Electrical Endurance: Rated for 600A short-term overload at 450VDC for up to 30s.
Typical Applications
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PV String Isolation in large-scale commercial and industrial solar power systems
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Battery Disconnects for BESS and hybrid systems
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Inverter-side Pre-Charge Switching for energy storage systems
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High-Voltage Disconnects for grid-tied solar inverters and smart meters
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Load Switching for DC grid applications in renewable energy installations
Summary of Technical Parameters
| Parameter | Value |
|---|---|
| Rated Current | 350A (≥120 mm² wire) |
| Rated Voltage | 12–1500VDC |
| Max Breaking Current | 2000A @ 1000VDC (1 operation) |
| Contact Type | SPST-NO (1 Form A) |
| Auxiliary Contact | SPST-NO (1 Form A), 6VDC 0.1A |
| Contact Resistance | ≤0.3 mΩ @ 350A |
| Electrical Life | 30,000 ops @ 350A 20VDC (make) 5,000 ops @ 350A 50VDC (break) 1,000 ops @ 350A 1000VDC (break) 500 ops @ 350A 1500VDC (break) |
| Mechanical Life | 200,000 operations |
| Coil Voltage Options | 12VDC / 24VDC |
| Coil Resistance | 16Ω / 64Ω ±7% |
| Rated Power Consumption | 36W (pull-in), 6W (holding) |
| Auxiliary Contact Rating | 6VDC 0.1A |
| Dielectric Strength | 4000VAC (coil to contact, main to auxiliary) |
| Insulation Resistance | ≥1000 MΩ @ 1500VDC |
| Operate / Release Time | ≤30ms / ≤10ms |
| Bounce Time | ≤5ms |
| Vibration | 49 m/s² @ 10–55Hz |
| Shock | 98 m/s² functional, 490 m/s² destructive |
| Operating Temperature | -40°C to +85°C |
| Max Contact Temperature | 130°C continuous / 180°C short-time |
| Mounting Orientation | Vertical |
| Weight | Approx. 400g ±15g |
Dimensional Drawing & Wiring Diagram
FAQs About The BSBC8P-350A High Voltage DC Contactor
Q1: What is the maximum current the C8P-350A high voltage DC contactor can handle?
A1: The C8P-350A is rated for 350A continuous current and can break up to 2000A at 1000VDC in a single operation.
Q2: Can the C8P-350A be used in 1500VDC systems?
A2: Yes. The C8P-350A is rated for 1500VDC, making it suitable for high-voltage solar and energy storage applications.
Q3: Does this contactor have auxiliary contacts?
A3: Yes, the C8P-350A includes a 1 Form A auxiliary contact for feedback or safety circuit integration.
Q4: How long is the electrical life of the 350A 1500V high voltage DC contactor?
A4: The contactor is rated for 30,000 operations at 350A 20VDC making and 5,000 operations at 350A 50VDC breaking.
Q5: What precautions should be taken for inductive or capacitive loads?
A5: For inductive loads (L/R > 1ms), always install a surge suppressor (e.g., TVS or varistor). For capacitive loads, use a pre-charge circuit to avoid high inrush currents and contact damage.
Precautions for Use
Mechanical Installation
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Use spring washers during installation to prevent loosening.
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Recommended torque:
– Load terminals (M6): 6–8 N·m
– Mounting screws (M5): 3–4 N·m -
Ensure proper copper bar flatness and hole size to avoid threading damage.
Electrical Protection
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Inductive loads (L/R ≥1ms): Use TVS or varistor for surge suppression.
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For capacitive loads, a pre-charge circuit is required to limit voltage differences to ≤20V during closing to avoid contact fusion.
Coil Protection
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For non-economizer models, use TVS or varistor to suppress reverse EMF.
⚠️ Avoid using diodes, as they extend the release time and reduce performance.
Environmental Guidelines
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Operating temperature: –40°C to +85°C
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Storage temperature: –40°C to +85°C
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Humidity range: 5%–85% RH
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Do not install near strong magnetic fields or heat sources like fuses, resistors.
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Store in a dry, cool place away from corrosive gases and direct sunlight.
Handling Notes
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Do not reuse the contactor if it has been dropped or physically damaged.
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Keep terminals free from grease or debris to avoid overheating.