Accessories
4.10 EFB300 external function box
3VA molded case circuit breakers with IEC certificate
496 Manual, 03/2019, A5E03603177010-03
The EFB300 external function box must be operated on a 24 V DC power supply unit. It acts
as a power supply for the connected ETU. This allows the ETU to remain operational even
when a 3VA molded case circuit breaker has tripped.
Functions of the digital input and digital outputs
Functions of the digital input
Two different functions can be implemented using the digital input:
● Tripped signals in the ETU can be reset (this also removes the reason for the tripped
signal from the ETU display and the default screen is displayed again).
● Information from a digital input can be made available via the communication interface of
the COM800/COM100 breaker data server, e.g. the status of a door contact transmitter.
Functions of the digital outputs
With the powerconfig software application, it is possible to selectively assign signals
transmitted by the connected ETU to the four digital outputs of the EFB300. powerconfig can
be accessed via the TD500 test device or by means of the COM800 or COM100 breaker
data server through the interface to the communication system.
The following signals (dependent on the ETU) can be assigned:
●
All the trip causes of the ETU
– Overload L
– Overload L in the neutral conductor
– Short-time delayed short circuit S
– Instantaneous short circuit I
– Ground-fault protection G
– Overtemperature
– Blocking protection (with motor protection)
– Idle running protection (with motor protection)
– Phase failure protection (with motor protection)
– RCD trip
– Group signal for trip due to short circuit (i.e. S or I)
This makes it possible to differentiate between overload and short circuit. This is an
important criterion for the question "May I reconnect?".
– Group alarm for trip by ETU
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