130
146
30
DCB r e a k
– InstructIons for InstallatIon, servIce and maIntenance
16
8.2. Assembly
DANGER! The DCBreak circuit breaker can be
installed either inside the vehicle in a special
ventilated cubicle or outside the vehicle (under-floor
or on-floor assembly) in the dedicated metal
enclosure. An enclosure with an adequate class of
protection must be used for assembly outside the
vehicle, so as to protect the circuit breaker
components from polluting dust and water jets.
The enclosures supplied by ABB for DCBreak circuit
breakers are in the IP65 protection class, in
accordance with the test requirements specified by
standard IEC 60529.
The minimum overall dimensions are determined by
the distances from the insulating panels (7.4 -
Dielectric dimensions). An opening flap measuring
at least 40 cm
2
must be integrated above the
enclosure. DCBreak circuit breakers must be fixed to
a flat surface by means of four 146x130 mm holes.
DANGER! The arc-quenching chute must be
fastened to the body of the circuit breaker
by means of its screws. Failure to tighten the
screws properly will impair the electrical
connection of the arc-quenching chute and
lead to serious failure of the circuit breaker.
8.1. Special requirements
DCBreak circuit breakers have been designed by
ABB for the standard uses defined by the IEC
standards.
Special requirements concerning the environment in
which the circuit breaker must be used (altitude
exceeding 1400 m, minimum operating temperature
less than -25 °C, presence of large amounts of
conductive polluting dust, etc.) can be considered
and purpose-made solutions can be defined
between the customer and ABB.
8.4. Mechanical interface
IMPORTANT! Remember to fix the DCBreak
circuit breaker to an insulated surface. If this
is not possible, use 20 mm spacers to raise
the fixing points. DCBreak circuit breakers
must be installed in the horizontal position
and fastened by four M8 screws (10)
tightened to 25 Nm torque value.
—
8. Putting into service
Screw
Tightening torque [Nm]
M4
3
M5
6
M6
10
M8
25
M10
48
M12
84
8.3. Tightening torque values
The tightening torque values given in the table
below must be applied using an adequate torque
wrench (with reference to class 8.8 screws)
