A cylindrical DC relay is an electrical switch that is used to control DC (direct current) circuits. It is called cylindrical because of its shape – it is a cylindrical device that typically has two or more metal contacts that can be opened or closed by an electromagnetic coil.

When a DC voltage is applied to the relay’s coil, it creates a magnetic field that attracts a movable contact, causing it to make or break a connection with a stationary contact. This action allows the relay to switch on or off a circuit that is connected to it.

Cylindrical DC relays are commonly used in various applications, such as automotive, industrial, and telecommunications. They are often preferred over other types of relays because of their high switching capacity, reliability, and long lifespan.

Cylindrical DC relays are commonly used in electric vehicles (EVs) to control various electrical circuits, such as the battery pack, motor, and charging system. They are often used in high-voltage applications where the switching capacity of the relay is critical for ensuring the safety and reliability of the vehicle.

In an EV, the cylindrical DC relays may be used for functions such as:

  • Controlling the main contactor that connects and disconnects the battery pack from the motor and other systems.
  • Controlling the pre-charge resistor that limits the current flow during the initial charging of the high-voltage system.
  • Controlling the DC-DC converter that converts the high-voltage battery power to the lower-voltage power required for auxiliary systems such as lights, HVAC, and infotainment.

The choice of a specific type and size of cylindrical DC relay will depend on the specific requirements of the application, such as the voltage and current ratings, switching speed, and environmental conditions.

EV DC Relays

EVI DC Relays

Cylindrical DC high Voltage Relays

1 Form A

Max Switching Voltage 1000 VDC

Contact Rate: 30A 50A 100A 150A 200A 250A 300A

Insulation Resistance: 1000MΩ (1000VDC)