Product Introduction
The BSB C8P-20A high voltage DC contactor is a 20A high voltage DC contactor designed for photovoltaic (PV) and energy storage system (ESS) applications. Featuring ceramic sealing for arc suppression and environmental protection, this relay is rated for up to 1500VDC, making it ideal for use in high-voltage solar and energy storage control circuits. The contactor provides reliable performance under demanding conditions and is built to handle high current switching with minimal contact resistance.
Product Features
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Main relay for solar power distribution and combiner boxes
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Battery management systems (BMS) for energy storage
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Pre-charge circuits and disconnection for photovoltaic inverter systems
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DC load control for PV inverter arrays
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Auxiliary switching for battery banks in ESS
Typical Applications
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Main relay for solar power distribution and combiner boxes
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Battery management systems (BMS) for energy storage
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Pre-charge circuits and disconnection for photovoltaic inverter systems
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DC load control for PV inverter arrays
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Auxiliary switching for battery banks in ESS
Summary of Technical Parameters
| Parameter | Value |
|---|---|
| Rated Current | 20A (≥4 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 @ 20A |
| Operate Time | ≤30 ms |
| Release Time | ≤10 ms |
| Bounce Time | ≤5 ms |
| Electrical Life | 10,000 ops @ 1000V 10A, 20,000 ops @ 1500V 20A (making) |
| 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-20A High Voltage DC Contactor
Q1: Can the C8P-20A high voltage DC contactor be used in residential PV systems?
A1: Yes, it is suitable for small to medium-scale PV installations and provides excellent protection and control for solar strings.
Q2: How does the C8P-20A perform in terms of switching speed?
A2: With a switching time of less than 30ms and release time of ≤10ms, the C8P-20A ensures reliable, rapid switching under heavy current loads.
Q3: What is the maximum voltage this contactor can handle?
A3: The C8P-20A is rated for operation up to 1500VDC, making it ideal for high-voltage applications in solar and energy storage systems.
Q4: How many installation methods are available for this product?
A4: This product offers plug-in and welded installation methods.
Precautions for Use
To ensure safe and reliable operation of the C8P-20 high voltage DC contactor, please observe the following precautions during installation, operation, and maintenance:
Mechanical Installation
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Use flat washers and spring washers when installing to prevent loosening.
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When using M5 screws, tighten them with a torque of 3N·m–4N·m to ensure sufficient washer thickness and strength. Otherwise, it may deform and break the shell.
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Maximum allowable pulling force for terminals:
– Load terminals: 49N
– Coil terminals: 49N. Exceeding these limits may cause damage. -
Do not install the contactor near strong magnetic fields (e.g., transformers, magnets), as this may affect the contactor’s electrical and switching performance.
Wiring Guidelines
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Ensure proper terminal connection with wires ≥ 4 mm² to avoid excessive heating at the terminals.
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Avoid attaching grease or other foreign matter to the terminals.
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Polarity: The contactor is designed to be non-polar for both load and coil circuits, making installation simpler.
Surge Protection & Capacitive Loads
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When using the contactor with inductive loads (L/R ≥ 1ms), take parallel surge suppression measures (e.g., varistors or TVS diodes). Failure to do so may reduce electrical life and cause improper switching.
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For capacitive loads, ensure to use pre-charge circuits and control the closing pressure difference to ≤20V to prevent contact fusion.
Environmental Conditions
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Operating Temperature: Ensure the ambient temperature remains between -40°C and +85°C to prevent internal gas penetration or contact failure.
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Storage Conditions: Store the contactor in a dry place at 5% to 85% RH and temperatures between -40°C and +85°C.
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Avoid exposure to direct sunlight and corrosive gases during storage.
Usage in Severe Environments
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Avoid using the contactor in the vicinity of heating objects (e.g., fuses, shunt resistors), as this could lead to overheating at the contact ends.
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If the contactor falls, it should not be used again, as this could cause irreversible damage.