Switch. Protect. Reset.

All-in-one solution for DC 850 V batteries for switching positive and negative terminals simultaneously, combined with resettable, electromechanical overcurrent and short circuit protection.

Developed for powerful HV battery systems in electrified vehicles.

Product in development.
B2.3 prototypes upon request

Redefining HV battery architectures

Modern vehicle platforms require high-performance, safe and as compact HV systems as possible. At the same time, numerous relays, fuses, pyrofuses, control lines and connectors increase the complexity in the battery pack.

conventional

HVB10 all-in-one solution

The HVB10 all-in-one solution combines central switching and protection functions in one device. This significantly helps facilitate the HV architecture and reduce the number of components and interfaces.

In the future, an HVB10 circuit breaker can replace up to 15 components and connections within a battery pack.

These include HV relays, fuse, pyrofuses, controls, busbars and connections between the individual components.

The result: Fewer components, fewer interfaces and a significantly simplified HV topology.

Your benefit

Compact integration into the battery pack
Easy electrical and mechanical connection
Efficient integration and wiring
Compact system architectures
Quick resettability after tripping

Develop the next HV architecture with us!

Are you considering new concepts for your battery pack, battery junction box or central HV distribution?

Contact our development team directly to discuss your requirements.

Request consultation

Switching and protection in one device

The HVB10 all-in-one solution performs several key functions within the

HV battery architecture

Double-pole switching (All-pole disconnection)
Two HV main contacts switch the positive and negative terminals simultaneously and physically separate both poles from the vehicle’s electrical system.

Electromechanical overcurrent protection
The protection function works without a sensor, microcontroller or software — even without an LV supply.

Quick short-circuit disconnection
High short-circuit currents are quickly interrupted electromechanically and without pyrotechnics.

Resettable protection concept
The HVB10 circuit breaker is designed to be switched on again after tripping and thus supports faster restart.

Switching status and cable break monitoring
Transmits the switch position and supports the diagnosis of contacts and lines.

Your benefits at a glance

Easy integration

Switching functions, overcurrent and short circuit protection in a single device reduce components and connections.

Physical isolation

The positive and negative terminals of the battery can be switched on and physically isolated at the same time.

High availability

The resettable concept supports rapid restart after tripping.

Software-free protection

The electromechanical protection function works without a microcontroller, software and LV supply.

Bi-directional operation

The HVB10 circuit breaker is suitable for energy output, recuperation and charging without a preferred current direction.

For demanding HV vehicle platforms

The HVB10 circuit breaker is being developed for use in powerful HV battery systems, such as:

Electric utility vehicles
Buses and specialty vehicles
Construction and agricultural machinery
Mobile work machines
Further electrified vehicle platforms

The focus is not on a single vehicle class, but on integration into future HV architectures with high currents, limited installation space and increasing requirements for availability and system efficiency.

All technical details and further information on the HVB10 circuit breaker can be found in the info sheet:

Open info sheet

Classification of values: These values come from a development experiment and do not represent final series values

Quick disconnection of high short circuit currents

When switched off, the resulting arc is deflected into the arc chamber by a magnetic field and split into several smaller arcs there. The counter-voltage generated in the process helps extinguish the arc quickly.

Experiments with a first-generation HVB10 prototype showed the following values at an open-circuit voltage of 918 V and a prospective short-circuit current of 17.5 kA:

Maximum current: 12.9 kA
Trip time: 5.45 ms
Maximum arc voltage: 2.24 kV
Transmission energy: 556,326 A²s

Current state of development and development goals

B2.3 prototypes are available upon request. They may only be tested under monitored laboratory conditions and with a redundant shutdown device.

Fourth-generation prototypes with improved performance data are planned for September 2026.

According to the current development plan, approval for use in customer test vehicles is planned for March 2027.

Feature	B2.3 prototype	Development goal
Rated voltage on the load side	DC 1,000 V	DC 1,000 V
Control voltage	DC 24 V	DC 24 V
Continuous current	300 A	340 A
Breakdown capacity	at least 12 kA	24 kA
Mechanical durability	100,000 circuits	500,000 circuits
Pole	2 main contacts, switching simultaneously	2 main contacts, switching simultaneously
Direction of current	bidirectional	bidirectional

Further B2.3 prototype values at a glance

Overload: 400 A for 600 seconds, 500 A for 180 seconds, 600 A for 90 seconds
Electronic service life: 50,000 circuits (120 A at DC 20 V); 1,000 circuits (300 A at DC 20 V)
Tripping threshold: 1.0 kA ± 10%
Ambient temperature: -20 to +60 °C
Maximum connection temperature (load side): +125 °C/257 °F
Electromechanical protection without a sensor, microcontroller, or software
Resetability after tripping: Functional, not yet approved for testing

Test your own prototype

Would you like to test the HVB10 circuit breaker yourself? Get in touch with us and request your prototype directly!

We will get back to you as soon as possible to discuss:

Your HV system architecture
Current and voltage requirements
Battery and precharge concept
Protection and disconnection requirements
Installation space and interfaces

About E-T-A

E-T-A is a world market leader for circuit breakers for equipment protection and circuit protectors. We offer you the world's most comprehensive product range in the following areas: overcurrent protection, power distribution, circuit breakers, power and solid-state relays and intelligent complete systems.

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