Littelfuse DCN High-Current, High-Voltage DC Contactor Relays enable design engineers to incorporate high-voltage relay switching into a range of high-current and high-voltage applications. Littelfuse 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. Applications include electric vehicles (EVs), charging stations for EVs and hybrid electric vehicles (HEVs), electric forklifts, and more.
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 an excess inrush current, a pre-charge contactor is used together with a pre-charge resistor to charge the capacitors of the power inverter to a level of typically 90−98% 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: Control other electrical loads in the vehicle that are operated by the HV battery (for example, electric heater, blower, A/C compressor, pneumatic brake compressor, power steering pump, and so on).
Magnetic arc blowout design that dissipates any arc between the contacts within a sealed, gas-filled arc chamber
Coil economizer that greatly reduces coil power and heating with signal pulse width modulation (PWM)
Polarized and non-polarized contact design options that optimize performance depending on electrical system load polarity