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 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).

Features

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

Applications

EVs
EV/HEV charging stations
Electric forklifts

Battery disconnect units and management systems
Uninterruptible power supplies
Renewable energy storage

Specifications

30A to 500A continuous carry
-40°C to +85°C operating temperature range

Up to 1800V voltage rating
IP54 and IP67 ingress protection

Videos

Datasheets

DCNSEV-30
DCNLEV-50
DCNLEV-100
DCNEV-150
DCNEVT-150

DCNEV-250
DCNEVT-350
DCNEVT-400
DCNEVT-500