Faster Assembly and Easy Maintenance
1. Locking Bar
A conductor will never
be connected incorrectly.
The design is based on the fact that each terminal has so-called „flat
locking bar“ in its bottom section. When tightening the screw, this bar occurs
step by step at the inlet hole and closes the space under the terminal. So it
avoids the conductor to be put-in under the terminal clip where it cannot be
interconnected with the inlet or outlet from the MCB.
The clip terminals have cross grooves at the bottom section – those grooves
avoid the conductor to be drawn-half out from the terminal because after being
tightened, the conductor „sinks“ into the grooves; in addition, the transfer
surface is extended and the contact resistances are limited essentially.
This is an unique solution which helps to avoid problems in case when the
terminal cannot be seen during installation. This principle excludes the
possibility to place the conductor under the terminal. In this way, frequent (latent)
claim defects can be avoided. Such defects occurred mostly at the end user and
the switchboard manufacturers had to bear additional expenses for „simple“
removal of such defects.
This solution avoids claims, makes assembling faster and increases
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Two-Line User's Inscription
Even if the
cover plate of a switchboard has been removed, you can still see which circuit
is protected by the MCB.
Each pole is equipped with an aesthetic transparent swing cover placed above
the switching-off lever. Under that cover, there is a paper two-line inscription
label put into slots. It is also possible to write on the plastic surface. The
cover has an arrestment in the upper open position.
3. Two Places for Installation Labels
instructions can always be easily seen.
||On each body, there are two facets, dimensions 4,8 x 17,6 x 0,5 mm, with a
dovetail lock for installation labels. See the photos above (on the left side,
an upper label marked as FA – 02, on the right side a bottom label marked as FA
The places have been selected so that it would be possible to use the upper
labeled facet, when the MCB is installed below the eye level; when installed
above the eye level, it is suitable to use the bottom labeled facet.
You can download templates of
installation labels to edit & print.
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Convenient Short Dimensions
There is more space for
the conductors on the switchboard.
As to the available information, because of their extraordinary short
dimensions (especially the width of only 81 mm), our P-E-P MCB´s are classified
as among the smallest MCB´s over the world in the category of short-circuit
resistance up to 10 kA. In the category of 15 kA, we have the shortest
dimensions worldwide (see the dimensioned chart).
- total height from the pawl incl. lever at switched-off position 72,23 mm
- total height from the DIN strip incl. lever at switched-off position
- total height from the DIN strip up to the surface is 61,6 mm
- total height from the DIN strip up to the surface of terminals is 43,8 mm
- total width is 81 mm + 5,2 mm
- width of controlling part 45 mm
- distance between the upper supporting part of the terminal and the DIN
strip 19,0 mm
- distance between the supporting part of the terminal for placing the
forked interconnecting strip and the DIN strip is 33,0 mm
- module width 17,6 mm
- bottom assembly label – width 4,8 x 17,6 x 0,5 mm
- upper users´ label – width 6,2 x 15,4 x 0,3 mm
Thus there is more space for conducting and connecting the conductors in
the installation section which is covered at a switchboard. This property can
be appreciated especially when using these MCB´s at small apartment
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5. Casing Resistance to Gaping Upon Terminal Installation
There is no gaping of the MCB
casing or cross threading of
the terminal in the casing.
||It is a relatively usual problem on other MCB´s – upon
an excessive screwing-up of the terminal, the casing opens or the
terminal crosses in the casing. On some MCB´s, even the joints and thus
the circuit are broken.
It is avoided on the MCB´s BONEGA® P-E-P by means of:
- plastic guides for the movable parts of the terminal, which has been
- press-pieces in the casing body
- places for rivets, chosen properly
- plastic pins (the casing has no butt joins)
6. Attach the MCB onto a Flat Surface without DIN Strip
No problem in assembling
to an old breaker box.
||You will appreciate that advantage – a possible attachment of our MCB
directly onto the flat surface without using the DIN strip - especially when
repairing old switchboards. This possibility do not require any modification of
How to do it:
- Screw a flat-headed screw into the flat area at the required position.
Leave that screw at a distance of approx. 5 mm from the surface (not
- Onto the prepared screw put the MCB which has a corresponding cut in
its upper part.
- Draw out the arresting pawl to its final „open“ position in the bottom
part and then fasten the MCB by another screw to the flat surface through a
hole in this pawl.
The connection created in such a way is unusually strong.
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7. Increased Vertical Stability on the DIN Strip
When tightening the
the MCB on a DIN strip will be straight.
||Another new concerning the BONEGA® P-E-P circuit breakers is
a very essential improvement of stability, while the conductors are
connected to the MCB. When drawing up the terminals, the MCB´s tend to
incline and it is necessary to “pre-stress” them manually.
stability has been reached by a plastic stop on the MCB bottom. After
attachment of the MCB to a DIN strip, this stop functions as the
“contra-pressure” (with the torsional stress of the MCB´s body). In contrast
to the competitors, the movable pawl has only the holding function.
The other hand does not have to engage itself with “pre-stressing” of
the MCB and can concentrate only to hold the conductor to be connected.
This measure accelerates the installation and makes is easier.
Interconnect by Forked or Reed (Rack) Strips
You can choose any
to interconnect the terminals.
For the P-E-P miniature circuit breakers you can use both the forked and the
reed (rack) standardized interconnecting strips. The opinions of application of
those two types differ.
- being put under the screw head, into the upper part of a double
terminal, they do not take any space in the bottom part of the terminal.
Because of what is written above they enable an unperturbed
connection of input conductors.
- when tightening the terminal screws, the forks can distend (only by
some suppliers when it concerns a cross-section of only 10 mm2
and soft cupper), thus the transmission area as well as current load
rating is reduced. (sometimes such an imperfect connection can cause the
“burning-out” of the connection resulting in a full devaluation of the
MCB´s or devices interconnected in that way)
- with other types of MCB´s which do not have a sufficient insulation
between separate terminals, the inter-phase short-circuit can occur
under specific circumstances. The MCB´s BONEGA® P-E-P can avoid that
phenomenon safely (see protection
against an inter-phase short-circuit).
Reed (rack) ones:
- a rack (reed) is also the pressure (second) area of the terminal
pressing onto the out-in conductor, thus it limits any possible
contact resistance to the minimum
- if you use two interconnecting strips with outputs at the edge of
the strips, the height seating of the terminal enables those two
interconnecting strips to be put in opposite to each other and to reach
a double transmission load rating
- e.g. the current load capacity of such a strip with an cross-section
16 mm2 with the power supply away from the strip edge is 80
A.; with two interconnected strips located in opposite and supplied away
from the strip edge it is up to 160 A; with two interconnected strips
located in opposite even up to 260 A
- being put into the bottom part of the terminal, they take a part of
its cross-section, thus they make the connection of input conductors
The strips are supplied either with the cross-sections of 16 mm2
or 10 mm2, always with insulating material made of self-extinguishing
ABS-VO. The copper contacts (reeds) are located closed at the strip edges. See
our offer of MCB´s accessories.
The single-pole MCB´s can be interconnected also in the so-called “German”
way, i.e. with a special strip without any insulation. When accepting this
method, it is necessary to break off both barriers against the inter-phase
short-circuit (see protection against an
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9. Connection of Input or Output on Either End
A possibility to connect
the input as needed.