Zb12; Foreword - Eaton ZB12 XTOB Series Manual

1 ZB12-.../XTOB...BC1 and ZB32-.../XTOB...CC1 overload relays

1.1 Foreword

1 ZB12-.../XTOB...BC1 and ZB32-.../XTOB...CC1 overload relays
1.1 Foreword
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In addition to the degree of protection specified in the standards
EN 60079-14 and VDE 0165 Part 1, further provisions have been made to
ensure safety from ignition for motors operated in potentially explosive
atmospheres.
EN 60079-7 prescribes additional measures to be taken for the operation
motors with "increased safety" type of protection "e". These measures
provide a higher degree of safety and prevent impermissible high
temperature and development of sparking and arcing on the motors, which
usually does not occur under normal operating conditions.
The motor-protective devices for this that are themselves not located in the
Ex e area must be certified by an accredited certification body.
For for motors in explosive dust-air mixtures, standard EN 60079-14 specifies
additional measures.
Directive 94/9/EC (ATEX 95) resp. 2014/34/EU on the approximation of the
laws of the Member States concerning devices and protective systems
intended for use in potentially explosive areas has been in force since
06.30.2003.
The ZB12-.../XTOB...BC1 and ZB32-.../XTOB...CC1 overload relays are
certified according to the 94/9/EC (ATEX 95) resp. 2014/34/EU Directives.
The following standards were used for aspects related to functional safety:
• Risk analysis of hazards, hazardous situations, and hazardous events as
per EN ISO 12100,
• SIL determined based on the risk graphs in IEC 61508.
￫
The EC prototype test certification numbers are as follows:
ZB12-.../XTOB...BC1: PTB 10 ATEX 3010
ZB32-.../XTOB...CC1: PTB 10 ATEX 3010
ZB12-..., ZB32-... 11/16 MN03407004Z-DE/EN www.eaton.com