Advertisement
Thes e induction-dis k relays are actuated by a potential operating coil on a
laminated U-magnet.
contact or contacts .
proper contact-closing voltage,
acting on the disk to give the correct time delay.
The s eal-in unit is mounted to the left of the s haft as s hown in Figure
This unit has its coil in s eries and its contacts in parallel with the main contacts
s o that when the main contacts clos e, the s eal-in unit picks up and s eals in.
the s eal-in unit picks up, it rais es a target into view that latches up and remains
expos ed until released by press ing a button beneath the lower-left corner of the
cover.
The relays are all mounted in s ingle-unit double-end cas es .
for external connections at both ends .
and the cas e are made through s tationary molded inner and outer blocks between which
res t a pair of removable connecting plugs that complete the circuit.
outer blocks carry the s tuds for the external connections , while the inner blocks
carry the terminals for the internal connections .
in parallel with both the upper and the lower inner molded blocks,
circuit is connected in s eries with thes e blocks .
the upper or lower connecting plug will energize the operating coil,
circuit will not be completed until the s econd connecting plug is ins erted.
relays
that have contacts
normal operating conditions ,
contacts
to
open
pos s ibility of incorrect tripping when returning the relay to s ervice after tests
and ins pection.
Thes e relays are protective devices des igned to clos e trip or alarm circuits
whenever
the
voltage
determined value.
paragraphs .
OPERATING CHARACTERISTICS
The Type IAV54E relay has a s ingle circuit-clos ing contact that clos es when the
voltage is reduced to s ome predetermined value;
zero
volts .
This
characteris tics , s hown in Figure 2.
UNDERVOLTAGE RELAYS
INTRODUCTION
The dis k s haft carries the moving contact that completes the
The disk s haft is res trained by a s piral s pring to give the
and its
clos ed when the relay is
the double-connecting-plug feature allows
before
the
trip
APPLICATION
applied
to
their
The functions are des cribed in greater detail in the following
relay
is
a
time
GEH-1768
TYPE IAV
motion 1.s
retarded by permanent magnets
The electrical connections between the relay
The operating coil is connected
In this way, ins ertion of either
de-energized but open under
circuit
is
completed,
operating
coils
thus ,
undervoltage
3
The cas e has s tuds
The molded
and the trip
but the trip
the relay
thus
mJ.nl.ml.ZJ.ng
des cends
to
s ome
the contacts are clos ed at
relay
with
invers e
1.
When
For
the
pre
time
Advertisement
