Datasheet
Miniature Circuit Breakers
Additional components
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Siemens LV 10.1 · 2011
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Overview
The Siemens mounting concept supports the combination of all
5ST3 additional components with Siemens 5SY and 5SP minia-
ture circuit breakers and with 5SU1 RCBOs.
5SL and 5SY6 0. . miniature circuit breakers are suitable for
mounting auxiliary switches and fault signal contacts. Auxiliary
switches can also be mounted on 5TE8 flush-mounting circuit
breakers and 5SG7 1 MINIZED switch disconnectors.
Auxiliary switches (AS)
The auxiliary switch (AS) always signals the contact position of
the miniature circuit breaker, regardless of whether the miniature
circuit breaker was tripped manually or as the result of a fault. An
additional version is also available for the switching of small cur-
rents and voltages for the control of programmable control sys-
tems (PLCs) acc. to EN 61131-2. The auxiliary switch with test
button enables the testing of control circuits without the need to
switch the miniature circuit breaker.
Fault signal contacts (FC)
The fault signal contact (FC) signals the automatic tripping of the
miniature circuit breaker in the event of a fault, such as an over-
load or a short circuit. If the fault signal contact is activated, the
contact position does not change if the miniature circuit breaker
is tripped manually. Fault signal contacts with TEST and RESET
buttons enable the testing of control circuits without the need to
trip the miniature circuit breaker. The red RESET button inte-
grated in the handle also indicates the automatic tripping of the
MCB. The signal can be acknowledged manually using the
RESET button.
Shunt trips (ST)
Shunt trips are used for the remote tripping of miniature circuit
breakers.
Undervoltage releases (UR)
Undervoltage releases are integrated (e.g. in EMERGENCY
STOP loops), thus ensuring that the MCB trips in the event of an
emergency, which, in turn, ensures disconnection of the control
circuit according to EN 60204. In the event that the voltage is in-
terrupted or too low, it also trips, i.e. prevents activation of the
MCB.
Remote controlled mechanisms (RC)
Remote controlled mechanisms are used for the remote ON/OFF
switching of miniature circuit breakers and the remote ON
switching of RC units, as well as the local manual switching of
these devices. A blocking function permits maintenance work. In
the event that a miniature circuit breaker or RC unit is tripped, an
acknowledgment must be carried out prior to switching back on.
The remote controlled mechanism has an operating mode selec-
tor switch with the functions: "Locked", "Manual" and "Remote
Switching". The mechanism can be mechanically latched and
locked, which serves to protect personnel during maintenance
work.
RC units
RC units can be combined with miniature circuit breakers of
characteristic A, B, C and D. They then form a combination of
RCCB and MCB for personnel, fire and line protection. The com-
binations can be tailored to meet individual requirements.
For information on RC units, please refer to the section "Residual
current protective devices".
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Benefits
Can be universally retrofitted with all additional components
• The 5SL, 5SY and 5SP miniature circuit breakers are ideal for
the quick and easy mounting of auxiliary switches and fault
signal contacts.
Captive metal brackets on additional components ensure the
quick and easy mounting of devices on the miniature circuit
breakers without the need for tools.
• Fault signal contacts with TEST and RESET button enable the
simple testing of auxiliary circuits and, in the event of a fault,
acknowledgement of the fault over the RESET button, without
the need to switch the miniature circuit breakers.
© Siemens AG 2011