Why 400 Hz? Flexible Cables for Ground Power Supply from SAB

While power grids with 50 Hz (Europe/Asia) or 60 Hz (North America) are standard in industry and households, a different frequency is used in civil and military aviation: 400 Hz. The reason for this is obvious – and deeply rooted in technology.

Why 400 Hz?

A higher frequency range allows transformers and motors to be built significantly smaller and lighter. This saves space and weight – two crucial factors in aviation.

The technical background:

The electromotive force (EMF) increases with frequency. This means that less iron and wire is required in the transformer, which makes the design considerably more compact.

The downside: 400 Hz is not suitable for long transmission distances, which is why this technology is limited to applications with short distances – such as in aircraft. There, converters generate an on-board voltage of 200 V / 115 V at 400 Hz, usually with outputs of up to 90 kVA (according to DFS 400 / ISO 6858).

The right cable for 400 Hz applications? You’ll find it here.

We rely on:

• High flexibility
• Strong EMC shielding
• Robustness and abrasion resistance for extreme environments

Customised assembly according to customer requirements

Thanks to our in-house assembly department, we offer tailor-made solutions: whether assembled to length, equipped with connectors or as a ready-to-install system. Fast, reliable and in accordance with the highest quality standards.

Contact us for your 400 Hz application – we will be pleased to advise you!