PyroFuse-pyroswitch -Eaton Bussmann application:

Eco-friendly electric vehicles (EV, HEV, PHV) have rapidly penetrated the market as social awareness towards environmental protection increased over the years.

EVs equipped with high-voltage battery requires anti-electrification and secondary disasters in case of traffic accidents and malfunctions.

Eaton Bussmann s' Pyro-Fuse enables safe, instantaneous shutdown of high-voltage electric currents.

Pyro-Fuse could also be utilized not only for EVs but also any industrial applications in need of instant circuit isolation.

What is Pyrofuse/Pyroswitch?

Pyrofuse Also called Pyroswitch、Pyrotechnical safety switches（PSS）.

Basically, it is a high voltage positive battery terminal fuse which explodes and disconnects the electrical connection irreversibly to avoid short circuit or fire 

when a car gets into accident or crash. The positive terminal coming out of battery is disconnected the same second, car is crashed.

What is the role of Pyrofuse?

The main function of Pyrofuse is switching.In case of collision, short circuit or other safety faults,

Pyrofuse can cut off the power supply in a short time to reduce the probability of danger;

In the battery system, the power supply refers to 12V lead-acid battery or high-voltage battery.

The picture is from Autoliv official website.

The picture is from Autoliv official website.

How does it work?

Pyrofuse's technology is not new, but it is a new application in the battery system.

It comes from the ignition method of automobile air bag, which inflates the air bag by means of gunpowder explosion.

The pyrofuse we are talking about uses this ignition method to disconnect the copper bar and acts as a fuse or relay.

The following figure shows the decomposition of Pyrofuse's action process.