Smart electricity meters give building managers insight into and control over energy use. Littelfuse makes the solid state relays,
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EVs and industrial electronic control systems need robust power management solutions. Littelfuse’s high-voltage dc contactor relays meet those needs while also providing high-current circuit protection. Our contactor relays come with continuous current ratings up to 500 A and maximum voltage ratings up to 1.8 kV dc. Some versions incorporate pulse with modulation (PWM) technology to reduce power demands for keeping contacts closed. Common applications include EV charging stations, uninterruptible power supplies, and dc motor controllers. Browse our off-the-shelf dc contactors or partner with us on your next design.
- Auxiliary switches for HVAC-R units and definite purpose contactors for vehicles and industrial and lighting applications available.
- Auxiliary Switches & Definite Purpose Contactors
High Voltage DC Contactor Relays Parts
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High Voltage DC Contactor Relays Applications
Electricity Meters
2/3-Wheeler Energy Storage
Look to Littelfuse for overcurrent and overvoltage protection of energy storage devices in two- and three-wheeler EVs. This block diagram
Battery Disconnect & Power Distribution - Truck & Bus
Li-ion battery disconnect switches ensure EVs and electric buses remain charged while parked. Power distribution units that incorporate
HVAC
Leading OEMs rely on Littelfuse for critical electronic components of HVAC equipment. We engineer the broadest portfolio of devices to protect
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Frequently Asked Questions
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What are high-voltage dc contactor relays?
High-voltage dc contactor relays are electromechanically operated switches designed for direct connection to high-load devices such as electric motors. Unlike standard dc relays, these heavy-duty contactors often have features like magnetic blowouts and sealed gas chambers to suppress electrical arc, and they are sometimes designed with features like coil economizers
How do high-voltage dc contactor relays work?
In a typical high-voltage dc contactor, when a control voltage is applied to the coil contacts, it generates a magnetic field that attracts a movable iron core toward a fixed core. Movable contacts attached to the moveable core are pulled toward fixed contacts. When the contacts meet, it completes the circuit and allows power to flow to the load. When the control