Tmax T8serie of circuit-breakers and disconnectors consist of a plastic structure which houses the operating mechanism, the poles
and the auxiliary parts. Each pole, insulated from the others, contains the circuit-breaking parts and the current sensor of the corresponding
phase. The fixed version circuit-breaker has its own terminals for connection to the power circuit.
1.2 External front view of the circuit-breaker
1
2
Fig. 1
1 PR232/P-T8, PR331 o PR332 electronic microprocessor-based release
2 Operating and control parts of the operating mechanism and release tripped signals
3 Rating plate
3
1.3.1 IEC Circuit-breaker rating plate data
Fig. 2
1.3.2 UL Circuit-breaker rating plate data
Fig. 3
2.Checking on receipt
Fixed circuit-breaker
Examine the state of the material received and its consistency with the content of the order. Should any damage or errors be found on unpacking,
which must be carried out carefully, make the relative notification within and not over 5 days from the receipt of the material.
The notification must indicate the number of the shipping note.
3.Storage, lifting and weights
The circuit-breaker, protected by an external wooden crate, is fixed by means of screws to the transport pallet or to the bottom of the packing
case. If the circuit-breaker has to remain in the warehouse even for a short time before being put into service, after checking it on receipt,
it must be put back in its container and covered with a waterproof sheet.
Caution
– Use a dry, dust-free room free of aggressive chemical agents as a storage room
– Position the circuit-breaker and any fixed part on a horizontal surface, not in direct contact with the floor, but on a suitable support surface
(Fig. 4)
– The maximum number of stackable circuit-breakers is indicated in figure 5
– Keep the circuit-breaker in the open position and with the closing springs discharged to avoid unnecessary stresses and the risk of accidents
to the personnel.
Fig. 4Fig. 5
Model
L3692
L3885
Apparatus
Doc. No.
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For lifting, refer to the following instructions: the circuit-breakers must be placed on a sturdy supporting surface and lifted, preferably, by means
of a special fork-lift truck. However, the use of ropes is allowed. In this case, the lifting ropes must be hooked up as shown in the figures
Fig. 6
Table of the circuit-breaker weights (Kg.)
Circuit-breaker 3 poles 4 poles
Kg Lbs Kg Lbs
T8 1600 (UL)7316195209
T8 20007316195209
T8 25007316195209
T8 3000 (UL)107236140308
T8 3200 (IEC)107236140308
Notes
The weights indicated in the table are intended for circuit-breakers complete with PR232/P-T8, PR331 or PR332 releases and relative current sensors, excluding the accessories.
4.Installation
4.1Installation room
Install the circuit-breaker in a dry, dust-free, non-corrosive room,
and in such a way that it is not subject to shocks or vibrations.
Where this is not possible, install it inside a switchboard with a
suitable degree of protection.
For the preparation of the installation room, please refer to the
“Overall dimensions” paragraph, which gives information on the
following points:
– minimum installation volumes of the circuit-breakers and derived
versions
– distances to be respected for circuit-breakers in compartments
– overall dimensions of the circuit-breakers
– fixing drillings
– compartment door drillings.
The installation, commissioning and any ordinary and
extraordinary maintenance have to be done by skilled personnel,
with a detailed knowledge of the apparatus.
To install a circuit-breaker in the switchboard is enough to fix the circuitbreaker to a vertical surface with M8 screws (fig. 7).
4.2Installation of the flange on the compartment door (Fig. 8)
– Make the compartment door drillings specified in the “Overall dimensions” paragraph.
– Attach the flange (1) on the front of the compartment door, fixing it from the inside by means of the self-tapping screws (2).
Fig.7
Fig. 8
Model
2
1
L3692
L3885
Apparatus
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5.Electrical connections
5.1Connections to the power circuit
5.1.1Shapes of the terminals
FES
Front terminals
(IEC/UL)
Fig. 9
Note
The drawings are provided to show the type of terminal in graphic form. The exact shape of the terminals is given in the “Overall dimensions”
chapter. Different terminals can be installed between the top and bottom parts (inlet and outlet).
5.1.2Examples of positioning the connection busbars according to the types of terminals
Front terminals
extended (IEC)
VR/HRVR
Adjustable rear
terminals ( VR for
IEC/UL; HR for
IEC)
Vertical rear
terminals (IEC)
VR
Vertical rear
terminals (UL)
The connection busbars enable the connection between the terminals of the circuit-breakers and the busbars of the switchgear. Their sizing
must be carefully studied by the switchgear designer. Some examples of possible constructions in relation to the shape and size of the circuitbreaker terminals are given in this paragraph. It is normally advisable to exploit the whole contact surface of the terminal, so the width of the
connection busbars should be the same as that of the terminal. Different connection capacities can be obtained by adjusting the thickness
and number of busbars in parallel. In some cases, reductions in the width of the connection in relation to that of the terminal are allowable as
shown in the following examples.
Positioning the first anchoring baffle of the busbars
Anchoring to the switchgear
190
7.48"
190
7.48"
190
7.48"
190
7.48"
190
7.48"
190
7.48"
190
7.48"
Fig. 11
5.1.3Assembly procedure for the connection busbars
Check the state of the contact surfaces of the connections very carefully: they must be very clean with no burrs, dents or traces of rust which
must be eliminated using a fine file or an emery cloth to prevent localized increases in temperature. On completion of the operation, remove
all traces of grease or dust with a cloth soaked in a suitable solvent.
When aluminium connections are used, it is necessary to tin-plate the contact surfaces.
The connections must not exert any strain on the terminals in any direction.
Always insert a large-diameter flat washer and a spring washer between them (to spread the tightening pressure over a greater area).
Make the contact between connection and terminal and tighten the fixing screws completely.
Always use two wrenches (so as not to strain the insulating parts excessively),applying the tightening torque
of the main terminals =70 Nm/615 lb in for M12 high strength screws. Check tightness after 24 hours.
5.2Wiring the circuit-breaker auxiliary circuits
A special terminal box is provided, fitted with screw terminals for connecting the auxiliary circuits.
The terminals are marked with alphanumerical identification codes as for the electrical circuit diagram.
The terminal box is identified by code XV on the electrical circuit diagram.
The terminal box is immediately accessible when the compartment door is open.
XV
Fig. 12
Model
L3692
L3885
Apparatus
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6.Putting into service
6.1 General procedures
– Check tightness of the power connections at the circuit-breaker terminals
– Carry out all the preparatory operations on the release
– Make sure that the value of the auxiliary circuit power supply voltage is between 85 and 110% of the rated voltage of the electrical applications
– Make sure that there is an adequate air circulation in the place of installation to avoid overheating
– Also carry out the checks specified in the following table.
Item inspected
1 Manual operating mechanism
2 Geared motor (if provided)
3 Undervoltage release (if provided)
4 Shunt opening release (if provided)
5 Shunt closing release (if provided)
6 Circuit-breaker lock in the open position
(with key or padlocks)
7 Auxiliary contacts of the circuit-breaker
Procedure
Carry out some opening and closing
operations (see chapter 7.2).
CAUTION
When there is an undervoltage release, the
circuit-breaker can only be closed after the
release has been electrically energized.
Supply the spring loading geared motor at
the corresponding rated voltage.
Carry out some closing and opening
operations.
Note. Supply the undervoltage release at the
corresponding rated voltage (if any).
Supply the undervoltage release at the
corresponding rated voltage and carry out
the circuit-breaker closing operation.
Disconnect voltage to the release.
Supply the undervoltage release at the
corresponding rated voltage and carry out
the circuit-breaker closing operation.
Close the circuit-breaker.
Supply the shunt opening release at the
corresponding rated voltage.
Open the circuit-breaker.
Supply the shunt closing release at its rated
voltage.
Open the circuit-breaker, turn the key and
remove it from its seat. Attempt circuit-breaker
closing operation.
Insert the auxiliary contacts in suitable
signalling circuits. Carry out some circuit-
breaker closing and opening operations.
Positive check
The spring loading lever moves correctly.
The springs are loaded correctly.
The signals are correct.
The geared motor stops with the springs
loaded.
The geared motor reloads the springs after
each closing operation.
The circuit-breaker closes correctly. The
signals are correct.
The circuit-breaker opens. The signal changes
over.
The circuit-breaker opens correctly. The
signals are correct.
The circuit-breaker closes correctly. The
signalsare correct.
Both manual and electrical closing are
prevented.
The signals are given correctly.
Model
L3692
L3885
Apparatus
Doc. No.
Tmax T8
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Page No.
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7.Instructions for use
7.1Operating and signalling parts
1 Pushbutton for the manual opening operation
2 Lever for manual loading of the closing springs
3 Mechanical indicator for circuit-breaker open “O” and closed “I”
4 Mechanical indicator for protection release tripped
5 Pushbutton for the manual closing operation
6 Signalling device for springs loaded - unloaded
7 Operation counter (on request)
8 Key lock on the closing operation (on request)
Fig.13
Note
On request, a transparent cover can be installed on the front of the circuit-breaker to increase the degree of protection to IP54. The cover has
a locking key.
As an alternative to the transparent cover, a protection can be mounted on the manual closing and opening controls, which only allows operation
of the pushbuttons by means of a special tool.
4
8
1
2
3
5
6
7
Fig. 14
7.2Circuit-breaker closing and opening procedures
The operation of the circuit-breaker can be either manual or electrical.
a) Manual loading of the closing springs
– Make sure that the indicator (3) shows “O” (circuit-breaker open)
– Make sure that the indicator (6) is WHITE (springs discharged)
– Repeatedly activate the lever (2) until the indicator (6) changes its
color to YELLOW
b) Electrical loading of the closing springs
The electrical loading of the circuit-breaker is possible when the
following accessories (supplied on request) are present:
– geared motor for automatic loading of the closing springs
– shunt closing release
– shunt opening release.
The geared motor automatically reloads the springs after each closing
operation until the yellow indicator appears (6, Fig. 15). When the
power is cut off during loading, the geared motor stops and
automatically starts reloading the springs again when the power
returns. It is, in any case, always possible to complete the reloading
operation manually.
Model
L3692
L3885
Fig. 15
Apparatus
Doc.No.
2
36
Tmax T8
1SDH000682R0002
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Page No.
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