Introduction
Document content
1 Introduction
1.1 Document content
This document describes how to assemble and commission HR55x residual current relays safely and
properly, and how to assemble and use HR72xtoroidal transformers.
The illustrations and descriptions in this manual are for clarification purposes only and may differ from
the actual state of the software due to regular improvements being made.
Date Document Version
05/2024 Residual-current-relays_HR55x_manual_EN_2024-05 Version 1
Residual current relays
HR551 Residual current relay 0.03–3A, type B, 1-channel
HR554 Residual current relay 0.03–3A, type B, 4-channel
Toroidal transformers
HR721 Toroidal transformer ø35
HR722 Toroidal transformer ø55
HR723 Toroidal transformer ø80
HR724 Toroidal transformer ø110
Table 1: Reference list
1.2 Target group
This document is intended for installers, system administrators and electrically trained specialists
working with a differential current protection and monitoring relay of type B.
The assembly, installation and configuration of electronic devices may only be performed
by an electrically trained and certified specialist, in accordance with the relevant installation
standards of the country.
The accident prevention regulations valid in the appropriate countries must be complied
with.
4 Fehlerstromschutz-Relais
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