Littelfuse DCN High-Current High-Voltage DC Contactor Relays
Littelfuse DCN High-Current High-Voltage DC Contactor Relays enable design engineers to incorporate high-voltage relay switching into various high-current and high-voltage applications. These DCN contactor relays offer 30A to 500A continuous carry and up to 1800V voltage rating. The magnetic arc blowout design dissipates any arc between the contacts within a sealed, gas-filled arc chamber. The coil economizer feature greatly reduces coil power and heating with signal pulse width modulation. Typical applications for these Littelfuse relays include electric vehicles (EVs), charging stations for EVs and hybrid electric vehicles (HEVs), electric forklifts, and more.
Features
- Enables design engineers to incorporate high-voltage relay switching into high-current and high-voltage applications
- Magnetic arc blowout design dissipates any arc between contacts within sealed, gas-filled arc chamber
- Coil economizer greatly reduces coil power and heating with PWM
- Polarized and non-polarized contact design options optimize performance depending on electrical system load polarity
Applications
- EVs
- EV/HEV charging stations
- Electric forklifts
- Battery disconnect units and management systems
- Uninterruptible power supplies (UPS)
- Renewable energy storage
Specifications
- 30A to 500A continuous carry
- Up to 1800V voltage rating
- Up to IP67 ingress protection
- -40°C to +85°C operating temperature range
EV Application Examples
- Main Contactor: Used in both lines (positive and negative) of the traction battery. The main contactors connect and disconnect the traction battery from the entire electric drivetrain in the vehicle.
- Pre-charge Contactor: Used to protect the main contactors from excess inrush current, a pre-charge contactor is used together with a pre-charge resistor to charge the power inverter's capacitors to a level typically 90% to 98% of the battery voltage.
- Charger Contactor: Used to establish a connection between the battery charger and the traction battery when the vehicle is connected to a charging station.
- Auxiliary Contactors: Controls other electrical loads in the vehicle that are operated by the HV battery (e.g., electric heater, blower, A/C compressor, pneumatic brake compressor, power steering pump, and so on).
Videos
Additional Resources
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