Zb12/Xtob; Overload Relays; Preface - Eaton ZB12/XTOB Handbuch

10/10 MN03407004Z-DE/EN

Preface

1 ZB12/XTOB...BC1 and ZB32/
XTOB...CC1 overload relays
In addition to the type of protection specified in the
standards EN 60079-14 and VDE 0165 Part 1, further
provisions have been made to ensure the safety from ignition
for motors operated in potentially explosive atmospheres.
EN 50019 demands additional measures for operating
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 equipment used for this is operated at a location
separate from the Ex e area and must be certified by an
accredited certification authority.
EN 61214 requires additional measures for motors in the
presence of combustible dust.
The guidelines on the application of Directive 94/9/EC (ATEX
100a) on the approximation of the laws of the Member
States concerning equipment and protective systems
intended for use in potentially explosive atmospheres has
been enforced since 30
The motor-protective relays ZB12/XTOB...BC1 and ZB32/
XTOB...CC1 are certified by PTB according to the 94/9/EC
(ATEX 100a) Directives.
a The EU Certification of Conformity numbers are:
ZB12-.../XTOB...BC1: PTB 10 ATEX 3010
ZB32-.../XTOB...CC1: PTB 10 ATEX 3010
th
June 2003.
31