UNDERVOLTAGE ATTACHMENT (Figure 15)
SCREW
The
attachment is a continuous duty device,
which can be provided with or without a time delay, and
which mechanically trips the breaker if the voltage drops
30% to 60% of normal voltage. It is mechanically
set and has no auxiliary contact in its circuit. The
voltage time delay mechanism is of the pneumatic delay
type. The time
is controlled by the
adjusting
screw.
To
the
attachment, hold the move-
able
by hand, close breaker and slowly release
the
is fully opened, the spring
loaded plunger will be released, strike the
lever and
trip the breaker. Check for missing retaining rings and
loose
missing
and bolts. Check condition of coil.
If
attachment is noisy while being energized,
clean faces of
and
AUXILIARY SWITCH (Figure 16)
max. 6 stage,
12 contact
is available. It
mounted on top of the
energy mechanism on the
right hand
of the breaker and is
by the main
contacts. All contacts are operated by
and
factory adjusted
provide “a” (normally
open) and
“b" (normally
closed) contacts.
The position and the condition of all contacts can be see”
and inspected through the transparent dust
The
contacts may be changed from a
b
b to by
removing the
and inverting the contact bridge.
INTERRUPTING CAPACITY
IN
SINGLE CONTACT
24
20
15
10
7.5
230
250
CONTACT
230
250
BELL
ALARM SWITCH (Figure
Figure 17
A
bell
switch attachment is mounted on the
hand side of the breaker and will function only when
breaker is tripped by the
trip units. It
be
manually and/or electrically reset. Closing of breaker also
resets the
switch.
To check the alarm switch attachment, hip breaker with
trip button, the” with shunt trip. In both cases the switch
should not be actuated. Trip breaker by moving the series
trip coil magnet
the switch should operate.
