Versions For 50 To 400 Hz; 4.4.10 Versions For 500 V Operational Voltage; 4.4.11 Rccb With Left-Side N Connection - Siemens SENTRON Manual

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Residual current protective devices

4.4.9

Versions for 50 to 400 Hz

Because of the principle according to which they function, residual current

protective devices in their standard version are designed for maximum efficiency

in a 50 Hz network. The device specifications and tripping conditions also relate to

this frequency. With increasing frequency, sensitivity normally decreases. In order

to be able to implement effective residual current protection in networks up to

400 Hz (e.g. industrial systems), suitable devices must be used. Such RCCBs fulfill

the tripping conditions up to the specified frequency and provide corresponding

protection.

The standard versions of residual current protective devices, with their creepage

and clearances, are designed for networks up to 240/415 V alternating voltage.

Suitable residual current protective devices are available for networks up to 500 V.

Because RCCBs, particularly in Germany, are normally placed at the left of the

miniature circuit breakers but have the N-conductor connection on the right,

4-pole RCCBs are also provided with their N connection on the left-hand side.

RCCBs used in conjunction with miniature circuit breakers therefore require a

special busbar.

In order to make it possible to use standard busbars whenever required, four-pole

RCCBs with the N connection on the left are also available. The custom of installing

RCCBs to the left of miniature circuit breakers using standard busbar joints can

therefore be continued.

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