Operating Characteristics - GE IAV54E Instructions Manual

Thes e induction-d isk relays are actuated by a potential operating coil on a
laminated U-magnet.
contact or contacts .
proper contact-closing voltage,
acting on the d is k 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 close, the s eal-in unit picks up and s eals in.
the s eal-in unit picks up, it raises a target into view that latches up and remains
expos ed until releas ed 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 mold ed 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 cond itions ,
contacts to open
pos s ibility of incorrect tripping when returning the relay to s ervice after tes ts
and ins pection.
Thes e relays are protective d evices d es igned to clos e trip or alarm circuits
whenever the voltage
d etermined value.
paragraphs.

OPERATING CHARACTERISTICS

The Type IAV54E relay has a s ingle circuit-clos ing contact that closes when the
voltage is reduced to s ome predetermined value;
zero volts . This
characteris tics, s hown in Figure 2.
UNDERVOLTAGE RELAYS
INTRODUCTION
The d is k s haft carries the moving contact that completes the
The d is k s haft is res trained by a s piral s pring to give the
and
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 d etail in the following
relay is a time
GEH-1768
TYPE IAV
its motion is retarded
The electrical connections between the relay
The operating coil is connected
In this way, ins ertion of either
d e-energized
circuit is completed,
operating coils
thus ,
undervoltage
3
by permanent magnets
The cas e has s tuds
The molded
and the trip
but the trip
but open under
the relay
thus minimizing
d es cends to s ome
the contacts are clos ed at
relay with invers e
1.
When
For
the
pre­
time