Schaltbau C303: The Best Compact Bi-Directional DC Contactor for High-Power Switching

What sets the C303 apart? This compact, high-performance DC contactor offers full bi-directionality, meaning it can safely disconnect high power loads — up to 1.5 MW — regardless of the current direction. Whether used in charging or discharging applications, the C303 ensures safe operation without the risk of contacts welding, even under high short-circuit conditions. 

Key Features & Benefits

Up to 25 Percent Energy Cost Savings

The C303's permanently low contact resistance minimizes energy loss and reduces heating, requiring less cooling and improving overall efficiency. 

Full Bi-Directional Switching – V2G Ready 

With its specially designed arc extinguishing chamber, the C303 safely disconnects power in both charging and discharging cycles, making it ideal for vehicle-to-grid (V2G) systems and energy recovery applications.

Safe High-Power Breaking – Up to 1.5 MW

The innovative main contact system delivers exceptional breaking capacity under full load, ensuring safety in DC energy storage and distribution systems.

Explosion-Proof, Maintenance-Free Operation

Using permanent magnetic arc extinguishing, the C303 eliminates the need for gas encapsulation, preventing overheating and overpressure risks while improving operational safety.

Compact, Industry-Optimized Design

Built for industrial applications, the C303 features a space-saving footprint, making it easy to integrate into compact systems where larger contactors won't fit.

High Availability & System Longevity

Its robust construction ensures a long service life, reducing maintenance costs and maximizing uptime in mission-critical applications.

Enhanced Safety Compliance

The C303 includes a mirror contact for safe switching feedback, meeting IEC 60947-4-1, Annex F safety requirements. 

Three C303 Variants for Maximum Flexibility

Schaltbau offers three C303 versions, each designed for specific application needs:

Applications: Where the C303 Excels  

The C303 series is built for high-performance DC switching and is ideal for applications that demand reliable power control, safety, and efficiency. 

Battery Storage Systems and Stationary Energy Storage

• Safely manages charging and discharging cycles
• Ensures galvanic isolation of battery poles from the powertrain
• Prevents contact welding, enhancing system safety 

EV DC Charging Stations and Vehicle-to-Grid (V2G) Systems 

• Supports bidirectional energy flow for charging and grid integration
• Delivers reliable high-power switching under load 

Battery Test Benches and Regenerative Systems 

• Provides safe, repeatable switching in high-current DC test environments
• Handles high making currents without damage 

Why Choose the Schaltbau C303? 

With its compact footprint, energy efficiency, full bi-directionality, and high-power switching capability, the C303 series is the perfect solution for demanding DC applications. Whether for EV infrastructure, energy storage, or industrial DC systems, Schaltbau delivers cutting-edge reliability with the C303 contactor. 

Ready to Integrate the C303 into Your System? 

Call 800-575-5562 today or visit us to learn more about Schaltbau's C303 bi-directional contactor! 

Our solutions experts are ready to assist you!