Product Introduction
The BSB C8P-40A high voltage DC contactor is a high-performance 40A high voltage DC contactor designed for photovoltaic (PV) and energy storage systems (ESS). It features a ceramic-sealed structure, offering excellent insulation and protection against arcing. Rated for up to 1500VDC, the C8P-40A is ideal for use in high-voltage applications, providing long-term durability, low contact resistance, and rapid switching capabilities, which is essential for large-scale solar power and energy storage circuits.
Product Features
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High Voltage Rating: Rated up to 1500VDC, suitable for large-scale PV systems and energy storage solutions.
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Ceramic Sealed Design: Fully sealed to protect from dust, moisture, and external contamination, offering long-term reliability.
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Rated Current: 40A continuous with a 200A max breaking capacity at 1000VDC.
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Fast Switching: Operate time ≤30ms, release time ≤10ms, and bounce time ≤5ms for reliable switching.
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Flexible Coil Options: Available in 12VDC and 24VDC coil voltages.
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No Polarity Design: Simplifies installation by allowing non-polar wiring for both load and coil.
Typical Applications
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Solar power distribution and string protection
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Battery management systems (BMS) for energy storage systems
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Auxiliary circuit control for solar inverters
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PV string disconnection for large solar plants
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Switching control for solar and energy storage systems
Summary of Technical Parameters
| Parameter | Value |
|---|---|
| Rated Current | 40A (≥10 mm² wire) |
| Working Voltage Range | 12–1500VDC |
| Max Breaking Current | 200A @ 1000VDC (1 op) |
| Contact Type | SPST-NO (1 Form A) |
| Contact Resistance | ≤5 mΩ @ 40A |
| Operate Time | ≤30 ms |
| Release Time | ≤10 ms |
| Bounce Time | ≤5 ms |
| Electrical Life | 15,000 ops @ 1000V 10A |
| 20,000 ops @ 1500V 20A (making only) | |
| Mechanical Life | 200,000 ops |
| Coil Voltage | 12VDC or 24VDC |
| Coil Resistance | 56Ω / 224Ω (±7%) |
| Rated Power Consumption | Approx. 2.6W |
| Dielectric Strength | 3000VAC between contacts |
| 4000VAC between coil and contacts | |
| Insulation Resistance | ≥1000 MΩ @ 1000VDC |
| Vibration Resistance | 49 m/s² (10–55Hz) |
| Shock Resistance | Functional: 98 m/s², Destructive: 490 m/s² |
| Operating Temperature | -40°C to +85°C |
| Mounting Orientation | Vertical |
| Weight | Approx. 156g ±15g |
Dimensional Drawing & Wiring Diagram
Plug-in type with mounting feet
Welded type
Wiring Diagram
FAQs About The BSBC8P-40A High Voltage DC Contactor
Q1: Can the C8P-40A high voltage DC contactor be used in both residential and commercial PV systems?
A1: Yes, the C8P-40A is designed for use in both small residential and large-scale commercial PV systems, offering flexible applications in various power configurations.
Q2: Does the C8P-40A support rapid switching for ESS?
A2: Yes, it has fast switching times (≤30ms) and is ideal for use in battery management systems, ensuring efficient charging and discharging cycles.
Q3: What is the maximum current the C8P-40A can safely switch?
A3: The contactor can handle up to 200A max breaking current at 1000VDC, making it suitable for high-power ESS and PV applications.
Q4: How many installation methods are available for this product?
A4: This product offers plug-in and welded installation methods.
Precautions for Use
Please observe the following precautions to ensure safe and effective operation of the C8P-40A high voltage DC contactor:
Mechanical Installation
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Use flat washers and spring washers during installation to prevent loosening.
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When using M5 screws, tighten them with a torque of 3N·m to 4N·m to ensure sufficient washer strength. Failure to do so may deform the shell.
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The maximum allowable pulling force for terminals is:
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Load terminals: 49N
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Coil terminals: 49N Exceeding these limits may cause damage.
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Wiring Guidelines
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Ensure proper terminal connection with wires ≥6 mm² to avoid overheating at the terminals.
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Polarity: The contactor is non-polar for both load and coil terminals, simplifying installation.
Surge Protection & Capacitive Loads
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For inductive loads (L/R ≥1ms), use parallel surge suppression such as varistors or TVS diodes to protect the contactor from damage.
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For capacitive loads, pre-charge circuits should be implemented, and it is recommended that the closing pressure difference be controlled to ≤20V to avoid contact sticking.
Environmental Conditions
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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% to 85% RH
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Storage Life: 12 months in original packaging.
Handling and Installation
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Avoid exposure to corrosive gases or direct sunlight during storage.
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Do not use if the contactor is dropped during handling.