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2. GENERAL DESCRIPTION
Requirements in plant engineering and construction and in building automation are growing and growing. In the
context of increasing efficiency and reducing costs, the transparency of systems, remote maintenance and remote
access are getting more and more important. Early notification in the event of any disturbances and a fast response
to current problems will increase system availability, save costs and improve the overall stability of the production
process.
E-T-A provides the ideal solution for machine and panel builders with the intelligent protection system comprising
the REX12D and REX22D circuit protectors and the EM12D-TMB interface module. The system combines the well-
proven quality of DC24V overcurrent protection with the communication capabilities to superordinate bus systems.
It allows complete transparency of the DC24V power supply and provides all necessary information for a reliable
production process in this plant sector. Part of the information is the permanent transmission of status indication
regarding each individual circuit protector. In addition, the present load current of the circuit breaker and the load
voltage are transmitted to the superordinate control unit. A parameterizable limit value allows creation of a warning
threshold which advises the user of changing system conditions.
The new generation of electronic overcurrent protection REX12D/REX22D consists of the EM12D-TMB intelligent
supply module and the REX12D and REX22D versions of electronic circuit protectors which can be mounted side
by side in optional numbers. The 12.5 mm wide modules feature push-in technology for wiring with press release
buttons and allow no-tool timesaving and maintenance-free wiring. The supply module is designed for DC 24 V and
40 A and accommodates max. 10 mm² with wire end ferrule as a plus (+) supply. On the load output side, the cir-
cuit protector can be wired with 2.5 mm².
It is exactly tailored to the various needs of the users. And what is more: no additional accessories are required
when connecting the individual components electrically and mechanically. This helps save time and money!
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