TDK Corporation presents HVC27 (B88269X), its new generation of high-voltage contactors that can safely and reliably switch off continuous DC currents of 300 A to 500 A and operating DC voltages of up to 1000 V in lithium-ion batteries in 20 ms or less, depending on the type. This is made possible by the gas-filled ceramic arc chamber which is also used in the other HVC types from TDK. Completely new is the optional Hall-effect sensor for the auxiliary contact. It is used to detect the switching state of the main contacts. The bidirectional design allows only one HVC27 to charge and discharge batteries as well as to power motor drive systems and do regenerative braking (recuperation).

There are three mechanical versions of the UL-certified HVC27 series: an upright version (C1) with dimensions of 95 x 44 x 90 mm (L x W x H) and a horizontal version (C5) with 90 x 90 x 46 mm, as well as a third version as a replacement type (NIL) for the HVC25 (HVC200, 300 and 500). The high current contactors are available with single or double coil, with working voltages of 12V or 24V. The single-coil version requires 6W in continuous operation, the dual-coil version only 4W. The service life for resistive opening (450V/300A) is specified with 1500 operations for the single coil version and 2000 operations for the dual-coil version. At 750V/300A, these values are 150 and 1000 opening cycles, respectively.

High-voltage contactors with high continuous current carrying capacity are used, for example, in electric vehicles for fast disconnection of the lithium-ion battery as well as in DC charging stations and in stationary battery storage systems such as storage for photovoltaic or UPS systems.

The basic design consists of a moveable armature inside a hermetically sealed, gas-filled chamber. The armature is moved by an electromagnet and opens the contact to interrupt the high current. During disconnection of a high DC voltage normally an arc is generated. The main applications of high DC currents in the context of electric vehicles and energy systems are as follows: Firstly, it is utilised for switching off high DC currents in lithium-ion batteries within electric vehicles, ensuring safe and efficient operation. Secondly, high DC currents are integral to DC charging stations for electric vehicles, providing a rapid and reliable charging solution. Lastly, these currents play a crucial role in the use of lithium-ion batteries within energy storage and UPS (Uninterruptible Power Supply) systems, enabling efficient energy management and backup power solutions for various applications.

The main features and benefits of the product are noteworthy. Firstly, its bipolar design allows for both charging and discharging, making it versatile in various applications. Secondly, it can handle switching voltages of up to 1000 V and continuous DC currents as high as 500 A, making it suitable for demanding electrical tasks. Moreover, the gas-filled ceramic arc chamber ensures rapid breaking of high currents, enhancing safety and efficiency. For added convenience, there is also an optional new Hall-effect based auxiliary contact available. Overall, these features make the product a reliable and efficient choice for a wide range of electrical operations.