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HFA100 Datasheet Preview

HFA100 Datasheet

Multicontact Auxiliary Relays

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HFA100
Multicontact Auxiliary Relays
For AC and DC circuit applications.
Description
HFA Century Series relays are designed for
applications where a number of auxiliary
functions must be performed simultane-
ously. The Century Series coil design
provides longer operating life than
previeous designs as a result of changes in
the entire coil insulation system.
The six electrically separate contcact
circuits are adaptable for either circuit-
opening or circuit-closing applications. If
more than six circuits are to be controlled,
the coils of two or more relays may be
connected in series (DC only) or in parallel.
HFA Century Series relays are offered in
non-drawout case or drawout case
construction.
Non-drawout cas HFA relays are available
for front connection (suitable for surface
mounting only) or back connection (suit-
able for semi-flush mounting only).
Drawout case HFA relays are back-connect-
ed and are suitable for either semi-fluch or
surface mounting.
GE Multilin
1




GE

HFA100 Datasheet Preview

HFA100 Datasheet

Multicontact Auxiliary Relays

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HFA100 Multicontact Auxiliary Relays
Long-Life Coil
Design
Basic design features of HFA
Century series coils are as
follows:
Spool The spool on which this coil
is wound is made of high thermal
strength, glass-filled polyester to
obtain long life at elevated
temperatures. This material
shows no signs of cracking or
brittleness under accelerated life
testing.
Wire Insulation The wire insula-
tion is a polyamide-imide wire
coating (180° C rating) which
retains insulation integrity and
mechanical strength at continu-
ous elevated temperatures and
which is also non-hydroscopic
and fungus resistant. Tefzel insu-
lation is used where required,
such as on leads.
Encapsulation Polybutadiene
solventless impregnant.
Process The polyamide-imide
insulated coils, wound on high-
temperature spools, are prebaked
to drive off all volatile materials,
vacuum-impregnated with the
solventless varnish, and then
post-baked. The impregnation
material is also non-hydroscopic
and has temperature expansion
ceffiecients compatible with the
spool and with the wire, so that
stresses do not develop under
temperature cycling.
Nameplates for Century Series
relays are green to provide easy
visual differnetiation from stan-
dard life relays.
Accelerated life tests-conducted
at elevated temperature and
maximum voltage-have estab-
lished a projected dervice life of
40 years to 1 percent failure (that
is, when 1 percent of all such
relays have failed) at 55° C and
110 percent rated voltage.
Application
Selection of DC relays for tripping
duty where operating coil circuit
is ipened by an auxiliary switch:
The operating time of the stan-
dard HFA relay is approximately 5
cycles (60 Hertz basis). If used on
DC for tripping a circuit breaker,
the operating time should be
reduced to approximately 1 cycle
in order that no appreciable time
delay will be added to the oper-
atating time of the protective
relay. This can be accomplished
by selecting a relay which has a
lower voltage rating than the
control circuit. Recommended
voltage ratings for one minute
tripping duty are listed below.
When so applied, the HFA operat-
ing coil must be opened by the
breaker auxiliary switch, to
prevent overheating. The
increased current through the
HFA operating coil will assure
operation of the target on the
protective relay.
High-Speed Tripping
HFA153K and 173K relays are
designed to have a pickup time of
no more than 1/2 cycle (60 Hertz
basis). The required coil series
resistor is included in the basic
model number. All models have
one longwipe normally closed
contact for inserting this resistor
in the coil circuit once the relay is
picked up.
Contact Rating
Contacts are electrically separate
and easily reversible from
normally open to normally closed
or vice versa. The current-closing
rating of the contacts is 30
aperes. The current-carrying
rating is 12 amperes
Recommended voltage ratings for one minute tripping duty
Supply Voltage
(Volts DC)
Use Relay with
Coil Rated: (Volts Oper-Coil Current
DC) (Amps)
Target CoilTap
Value in Prot.
Relay (Amps)
Time to Close
N.O. Contacts at
Pickup (60 Hz
Basis)
}24 6 5.3 2.0
32 6 7.1 2.0 Approxi-mately
48 12 2.7 2.0 one cycle
125 24 1.7 0.2
250 48 0.9 0.2
Contact Interrupting Ratings
Volts DC
1
Contact
(Amps)
2
Contacts in
Series (Amps)
Non-Inductive
6 to 24
48
125
250
15
8
3
1
Inductive
24 6.0
48 3.5
125 1.0
250 0.3
30
16
6
2
12
6
1.5
0.35
Volts AC
115
230
460
115
230
460
1 Contact
(Amps)
2
Contacts in
Series (Amps)
30 30
20 20
8 12
20 20
10 10
55
2 www.GEindustrial.com/Multilin


Part Number HFA100
Description Multicontact Auxiliary Relays
Maker GE
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HFA100 Datasheet PDF






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