ESS & Automotive Contactor – Ceramic Sealed High Voltage Contactors & Relays
The C8 Series offers ceramic sealed automotive contactors for up to 1500VDC—ideal for EVs, energy storage, and high voltage DC applications.
BSB’s C8 Series automotive contactors are high-performance ceramic sealed DC contactors designed for demanding high voltage DC applications. With current ratings from 20A to 500A and voltage handling up to 1500VDC, they are widely used in EV platforms, energy storage systems (ESS), and DC fast charging stations.
Built with advanced ceramic brazing technology and filled with hydrogen gas, the C8 series ensures excellent dielectric strength, arc suppression, and temperature endurance. These automotive contactors are available in plug-in, PCB, and bolt-down types, offering flexible integration into your electrical architecture.
Some models in the C8 Series are also engineered to withstand short-circuit conditions up to 8kA for 5ms, enhancing safety and reliability in high-power environments such as electric drivetrains and battery systems.
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Ceramic sealed with hydrogen filling for superior insulation
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Rated up to 1500VDC and 500A for high power applications
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Multiple configurations: plug-in, PCB-mount, and panel-mount
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Ideal for EVs, ESS, DC chargers, UPS, and PV systems
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High dielectric strength and thermal resistance
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Compact design, low contact resistance
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Long electrical life with high switching reliability
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RoHS and CE compliant, automotive-grade quality
- All series are certified by UL, CE, TÜV standards
What is a Ceramic Sealed DC Contactor (or Relay)?
BSB’s C8 Series ceramic sealed dc contactors, also known as ceramic sealed DC relays, are high-voltage switching components designed for demanding DC applications. Unlike traditional epoxy-sealed contactors, these components are sealed using ceramic brazing technology and filled with hydrogen gas. This ensures higher dielectric strength and superior thermal endurance, making them a preferred choice in automotive contactor applications, especially for high-voltage EV platforms.
C8 series part number
| Product | Part Number | Amp Rating | Switching Voltage | Coil Voltage Rating | Main Contact Form | Auxiliary Contact / Form | Load Termination | Mounting Type | Coil Characteristic | Certificates |
|---|---|---|---|---|---|---|---|---|---|---|
 | BSBC8P-10 | 10A | 1500VDC | 12VDC, 24VDC | SPST-NO (1 Form A) | / | QC, PCB | / | Single-coil | UL, CE |
| BSBC8P-20 | 20A | 1500VDC | 12VDC, 24VDC | SPST-NO (1 Form A) | / | QC, PCB | / | Single-coil | UL, CE |
| BSBC8P-30 | 30A | 1500VDC | 12VDC, 24VDC | SPST-NO (1 Form A) | / | QC, PCB | / | Single-coil | UL, CE |
| BSBC8P-40 | 40A | 1500VDC | 12VDC, 24VDC | SPST-NO (1 Form A) | / | QC, PCB | / | Single-coil | UL, CE |
 | BSBC8P-60 | 60A | 1500VDC | 12VDC, 24VDC | SPST-NO (1 Form A) | / | PCB | / | Single-coil | UL, CE |
| BSBC8P-80 | 80A | 1500VDC | 12VDC, 24VDC | SPST-NO (1 Form A) | / | PCB | / | Single-coil | UL, CE |
 | BSBC8V-100B | 100A | 750VDC | 12VDC, 24VDC | SPST-NO (1 Form A) | / | Female thread | Vertical | Single-coil | UL, CE |
| BSBC8V-150 | 150A | 750VDC | 12VDC, 24VDC | SPST-NO (1 Form A) | / | Female thread | Vertical | Single-coil | UL, CE |
| BSBC8V-200B | 200A | 750VDC | 12VDC, 24VDC | SPST-NO (1 Form A) | / | Female thread | Vertical | Single-coil | UL, CE |
 | BSBC8V-250C | 250A | 1000VDC | 12VDC, 24VDC | SPST-NO (1 Form A) | / | Female thread | Vertical | Single-coil | / |
 | BSBC8P-250E | 250A | 1500VDC | 12VDC, 24VDC | SPST-NO (1 Form A) | SPST-NO | Female thread | Vertical | Dual-coil | UL, CE, TÜV |
| BSBC8V-300C | 300A | 1000VDC | 12VDC, 24VDC | SPST-NO (1 Form A) | / | Female thread | Vertical | Single-coil | / |
| BSBC8P-300E | 300A | 1500VDC | 12VDC, 24VDC | SPST-NO (1 Form A) | SPST-NO | Female thread | Vertical | Dual-coil | UL, CE, TÜV |
| BSBC8V-350C | 350A | 1000VDC | 12VDC, 24VDC | SPST-NO (1 Form A) | / | Female thread | Vertical | Single-coil | / |
| BSBC8P-350E | 350A | 1500VDC | 12VDC, 24VDC | SPST-NO (1 Form A) | SPST-NO | Female thread | Vertical | Dual-coil | UL, CE, TÜV |
| BSBC8V-400C | 400A | 1000VDC | 12VDC, 24VDC | SPST-NO (1 Form A) | / | Female thread | Vertical | Single-coil | / |
| BSBC8P-400E | 400A | 1500VDC | 12VDC, 24VDC | SPST-NO (1 Form A) | SPST-NO | Female thread | Vertical | Dual-coil | UL, CE, TÜV |
| BSBC8V-500E | 500A | 1000VDC | 12VDC, 24VDC | SPST-NO (1 Form A) | SPST-NO | Female thread | Vertical | Dual-coil | UL, CE, TÜV |
BSBC8P-400E/1500
Why Choose Ceramic Sealed Automotive Contactors?
Ceramic sealed contactors are widely used in electric vehicles (EVs), energy storage systems (ESS), and DC fast charging stations. Thanks to their robust insulation and gas-filled architecture, they ensure safe and reliable operation at voltages up to 1500VDC and currents ranging from 20A to 500A.
Compared with epoxy sealed contactors, ceramic sealed units offer:
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Better resistance to high temperatures
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Stronger arc extinguishing capability
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Longer lifespan under high-voltage load
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Enhanced reliability in harsh environments
These features make them ideal DC contactors for EV, DC motor contactors, and other mission-critical systems.
C8 Series Overview and Product Types
The BSB C8 Series covers a broad current range from 20A to 500A and supports multiple mounting styles, including:
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Plug-in style contactors
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PCB-mounted DC contactors
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Bolt-down high voltage contactors
These configurations allow for easy integration across various applications, including EV battery packs, on-board chargers, solar inverters, and UPS systems.
Whether you are designing for 12V, 24V, or 48V contactor systems, the C8 series offers flexible solutions with high performance and compact form factors.
Internal structure of C8 series contactors
Applications of C8 High Voltage DC Contactors and Relays
BSB’s C8 contactors (also referred to as C8 relays) are widely deployed in:
Electric Vehicles (EVs) and electric motorcycles
Energy storage systems (ESS)
Photovoltaic (PV) systems
EV DC fast chargers
DC motor drives
Uninterruptible power supplies (UPS)
Rail transit and industrial automation
These contactors play a vital role in ensuring safe and efficient power switching in all kinds of electrified transportation and renewable energy solutions.
Why Choose BSB?
As a leading manufacturer of high voltage contactors, BSB combines in-house production capability with deep R&D expertise. Our C8 Series products are designed for both standard and customized requirements, enabling partners to optimize space, cost, and performance.
Competitive pricing backed by scale manufacturing
Strong focus on EV and energy markets
Proven reliability in high-volume deployments
Customization available for automotive OEM needs
We are committed to powering the electrification of tomorrow with smart and safe switching solutions.