The Siemens 5UB1564 is a DELTA i-system German Schuko socket outlet in white, featuring integrated overvoltage protection, a function display, and a labeling field. Rated at 16A/250V with screwless plug-in connection terminals, it is designed for flush mounting in standard 55x55mm insert format. This is the premium variant in the 5UB156x series — it combines circuit identification with active surge protection and visual status monitoring.

When should I choose the overvoltage-protected socket over the standard version?

The built-in overvoltage protection guards connected equipment against transient voltage spikes from the mains — caused by switching operations, nearby lightning strikes, or grid fluctuations. Choose the 5UB1564 over the standard 5UB1560 or 5UB1564's electric white twin 5UB1565 when you are powering sensitive electronics (computers, monitors, laboratory instruments, AV equipment) and want protection at the socket level without a separate surge protector adapter. The function display shows whether the protection circuit is active — if the LED goes out, the protective components have sacrificed themselves and the socket should be replaced.

How does the function display differ from the standard status indicator?

The standard status indicator on 5UB1560–5UB1563 simply shows that the socket is live. The function display on the 5UB1564 goes further — it monitors the health of the overvoltage protection circuit itself. A green LED means the surge protection is intact and active. If the LED extinguishes, the protective varistor has reached end of life (typically after absorbing one or more large surges) and the socket insert should be replaced to restore protection.

Frequently Asked Questions

Does the overvoltage protection replace a Type 1 or Type 2 surge protection device at the distribution board?

No. The socket-level protection is a supplementary Type 3 device for fine protection of individual equipment. It works together with — not instead of — the building's primary surge protection at the distribution board. For complete protection per IEC 61643-11, all three stages (Type 1 at the service entrance, Type 2 at sub-distribution, Type 3 at the socket) should be present.

Is this socket compatible with the same DELTA line frames as the standard 5UB156x models?

Yes. The 5UB1564 uses the same 55x55mm insert format and is fully compatible with all Siemens DELTA line cover frames. The overvoltage protection components are fully integrated within the insert — no additional depth or frame modification is needed.