ABB ITH Manual

Instruction

Leaflet

771

ABB

Power

Company

Inc

Relay

Division

Coral

Springs

33065

Type

ITH

Relay

Effective

October

1977

Supersedes

771

dated

May

1975

Denotes

change

since

issue

CAUTION

Before

putting

relays

into

service

remove

all

blocking

which

may

have

been

inserted

for

the

purpose

securing

the

parts

during

shipment

make

sure

that

all

moving

parts

operate

freely

inspect

the

contacts

see

that

they

are

clean

and

proper

and

operate

the

relay

check

the

settings

and

electrical

connections

The

High

Drop

Out

Instantaneous

Trip

Unit

(

ITH

)

The

high

drop

out

instantaneous

trip

unit

small

solenoid

type

device

(

Fig

)

plunger

sembly

(

Fig

)

rides

and

down

vertical

guide

rod

the

center

the

solenoid

coil

The

plunger

assembly

consists

bushing

which

threaded

the

moving

plunger

and

locked

place

byanut

anda

silver

disc

which

rests

helical

compression

spring

the

lower

end

the

plunger

The

guide

rod

fastened

the

stationary

core

which

turn

held

place

the

insulating

plate

which

the

stationary

contacts

are

mounted

The

stationary

core

consists

two

steel

sections

separated

non

magnetic

ring

This

non

magnetic

ring

provides

air

gap

which

the

plunger

steel

floats

When

the

coil

energized

the

plunger

assembly

moves

upward

carrying

the

silver

disc

which

bridges

three

spring

type

conical

shaped

stationary

contacts

this

posi

tion

the

helical

spring

compressed

and

the

plunger

free

move

while

the

contact

disc

remains

sta

tionary

Thus

vibrations

the

plunger

assembly

are

prevented

from

causing

contact

chattering

Micarta

disc

which

acts

shield

for

the

contact

plate

screws

the

bottom

the

guide

rod

and

locked

position

small

nut

The

adjustable

core

screw

the

top

the

frame

provides

the

principal

means

for

adjusting

the

current

operating

values

APPLICATION

ITH

relays

may

utilized

overcurrent

fault

detectors

instantaneous

overcurrent

trip

units

They

are

particularly

suitable

fault

detectors

cause

their

dropout

ratio

and

because

their

compact

size

recommended

that

these

units

used

fault

detector

applications

only

where

the

contacts

are

called

upon

carry

only

trip

coil

current

rather

than

auxiliary

relay

timer

current

For

example

zone

relay

may

supervised

ITH

relay

but

zone

relay

driving

should

not

(

unless

the

equipped

with

slow

dropout

feature

override

contact

bounce

)

Their

size

also

makes

them

desirable

for

use

sup

plementing

existing

time

overcurrent

relays

provide

second

set

instantaneous

trip

units

CONTENT

The

relays

consist

one

three

four

high

drop

out

instantaneous

units

with

equal

number

operation

indicators

and

one

contactor

switch

the

single

unit

relay

the

indicating

contactor

switch

used

place

operation

indicator

and

con

tactor

switch

Contactor

Switch

The

contactor

switch

the

relay

small

solenoid

type

switch

cylindrical

plunger

with

silver

disc

mounted

its

lower

end

moves

the

core

the

solenoid

the

plunger

travels

upward

the

disc

bridges

three

silver

stationary

contacts

The

coil

series

CONSTRUCTION

The

construction

the

individual

units

follows

All

possible

contingencies

which

may

arise

during

installation

operation

maintenance

and

all

details

and

variations

this

equipment

not

purport

covered

these

instructions

further

information

desired

purchaser

regarding

this

particular

installation

operation

maintenance

this

equipment

the

local

ABB

Power

Company

Inc

representative

should

contacted

Printed

Courtesy of NationalSwitchgear.com

TYPE ITH RELAY

STATIONARY

CONTACTS

Fig.

High Drop-Out .Instananeous Trip Unit

(ITH)

MOVING

CONTACT

PLUNGER

STEEL

Fig. 2. Plunger Assembly for ITH Unit.

Fig. 3. Indicating Contoctor Switch

(ICS)

CORE

SCREW

Courtesy of NationalSwitchgear.com

•

771

TYPE

ITH

RELAY

INTtMAl

SOtOUtlC

IKTUHMl

SCHEMATIC

xxxx

oreuTi

HttlTlM

IMICATM

CMTACTOt

HITCH

(

LHEI

COTCI

)

TTITI

TITI

in in

HIT

)

tut

HIT

(

)

LEFT

FHHT

HIT

(

)

•

IHT

FtHT

HIT

(

)

mitTEI

HMTIB

HITCB

tfO

WHILE

TEST

HITCH

CVnOT

TEST

MCI

‘

Jet

—

CltV

JiZJ

(

)

(

)

(

)

TEHIML

non

view

183

152

183

128

Fig

•

Internal

Schematic

the

Three

Unit

Type

ITH

Instantaneous

Overcurrent

Relay

•

with

the

main

contacts

the

relay

and

with

the

trip

coil

the

breaker

When

the

relay

contacts

the

coil

becomes

energized

and

closes

the

switch

contacts

This

shunts

the

main

relay

contacts

there

relieving

them

the

duty

carrying

tripping

cur

rent

These

contacts

remain

closed

until

the

trip

circuit

opened

the

auxiliary

switch

the

breaker

Fig

Internal

Schematic

the

Four

Unit

Type

ITH

Instantaneous

Overcurrent

Relay

•

the

frame

and

drop

out

the

pick

current

value

The

position

the

core

screw

determines

the

pick

value

for

particular

contact

gap

The

drop

out

ratio

accomplished

through

the

right

com

bination

plunger

steel

setting

electrical

pull

and

spring

strength

The

most

important

factor

the

adjustment

the

unit

the

correct

positioning

the

plunger

steel

with

respect

the

stationary

core

air

gap

Operation

Indicator

The

operation

indicator

small

solenoid

coil

connected

the

trip

circuit

When

the

coil

ener

gized

spring

restrained

armature

releases

the

white

target

which

falls

gravity

indicate

completion

the

trip

circuit

The

indicator

may

reset

from

outside

the

case

CHARACTERISTICS

ITH

Unit

The

ranges

available

for

the

instantaneous

units

are

0.25

0.5

1.0

and

amperes

The

unit

has

nominal

range

pick

adjustment

with

greater

drop

out

ratio

The

core

screw

the

top

the

unit

used

change

the

setting

The

maximum

core

screw

setting

ten

turns

out

from

the

fully

bottomed

position

the

maximum

end

the

range

may

necessary

increase

the

contact

gap

obtain

the

desired

pickup

long

the

setting

the

unit

within

its

nomi

nal

rating

the

drop

out

ratio

will

greater

Indicating

Contactor

Switch

Unit

(

ICS

)

The

indicating

contactor

switch

(

Fig

)

small

clapper

type

device

magnetic

armature

which

leaf

spring

mounted

contacts

are

attached

attracted

the

magnetic

core

upon

energization

the

switch

When

the

switch

closes

the

moving

con

tacts

bridge

two

stationary

contacts

completing

the

trip

circuit

Also

during

this

operation

two

fingers

the

armature

deflect

spring

located

the

front

the

switch

which

allows

the

operation

indicator

target

drop

The

nominal

range

may

extended

increas

ing

the

contact

gap

with

the

core

screw

its

maxi

mum

position

The

drop

out

ratio

for

settings

above

the

nominal

range

will

below

For

example

for

pick

setting

three

times

the

minimum

set

ting

the

drop

out

ratio

will

approximately

Likewise

for

setting

four

times

the

minimum

set

ting

the

drop

out

ratio

will

approximately

The

front

spring

addition

holding

the

target

provides

restraint

for

the

armature

and

thus

controls

the

pickup

value

the

switch

OPERATION

The

ITH

unit

current

operated

device

which

will

pick

within

the

range

stamped

the

side

Courtesy of NationalSwitchgear.com

TYPE

JTH

RELAY

Resistance

ampere

ICS

tap

Resistance

2.0

ampere

ICS

tap

6.5

ohms

Mtnui

KKMTIC

0.15

ohms

imieiTiM

CMTACTM

aviTca

oINSTALLATION

The

relay

should

mounted

switchboard

panels

their

equivalent

location

free

from

dirt

moisture

excessive

vibration

and

heat

Mount

the

relay

vertically

means

the

rear

mounting

stud

studs

for

the

type

projection

case

means

the

four

mounting

holews

the

flange

for

the

semi

flush

type

case

Either

the

stud

the

mounting

screws

may

utilized

for

grounding

the

relay

External

toothed

washers

are

provided

for

use

the

locations

shown

the

outline

and

drilling

plan

facilitate

making

good

electrical

connec

tion

between

the

relay

case

its

mounting

screws

studs

and

the

relay

panel

Ground

Wires

are

affixed

the

mounting

screws

studs

required

for

poorly

grounded

insulating

panels

Other

electrical

connections

may

made

directly

the

terminals

means

screws

for

steel

panel

mounting

the

terminal

stud

furnished

with

the

relay

for

thick

panel

mounting

The

terminal

stud

may

easily

removed

inserted

locking

two

nuts

the

stud

and

then

turning

the

proper

nut

with

wrench

For

detail

information

the

case

refer

076

ICS

OVfKMMST

MIT

CMttlS

oreUID

SMBTIM

TCI

KMOU

“

TOT

CMKEMT

TOT

MOT

)

nmatL

non

183

Fig

Internal

Schematic

ffce

Single

Unit

Type

ITH

Instantaneous

Overcurrent

Relay

The

burden

this

unit

minimum

pick

0.44

hertz

Characteristic

operating

times

for

the

unit

over

its

nominal

range

axe

Less

than

cycle

200

trip

value

cycle

500

trip

value

cycle

1000

trip

value

Continuous

current

rating

the

coil

times

minimum

pickup

value

One

second

rating

approximately

times

min

imum

pick

SETTINGS

AND

CALIBRATION

ITH

Unit

The

unit

prior

shipment

adjusted

for

mini

mum

pick

value

that

the

lower

value

marked

the

side

the

frame

The

following

procedure

used

when

changing

this

setting

over

the

indicated

range

where

higher

drop

out

ratio

desired

Connect

the

coil

the

unit

series

with

ammeter

and

adjustable

load

Apply

the

desired

pick

cur

rent

then

adjust

the

core

screw

until

the

plunger

just

picks

Lock

core

screw

securely

place

desired

set

the

unit

for

either

differ

ent

drop

out

ratio

over

the

nominal

range

for

pick

values

above

the

nominal

range

then

the

following

procedure

should

followed

Contactor

Switch

The

contactor

switch

operated

switch

with

pick

2.0

amperes

Operotlon

Indicator

The

operation

indicator

operated

indicator

with

pick

its

rated

value

The

two

standard

indication

ranges

are

0.2

and

1.0

ampere

The

indicating

contactor

switch

has

two

taps

that

provide

pick

setting

0.2

amperes

change

taps

requires

connecting

the

lead

located

front

the

tap

block

the

desired

setting

means

screw

connection

With

the

desired

drop

out

current

applied

adjust

the

core

screw

until

the

plunger

assembly

just

drops

out

Then

apply

the

desired

pick

current

and

adjust

the

Micarta

contact

shield

until

the

plunger

just

picks

recommended

that

the

contact

gap

should

not

made

less

than

013

inch

The

contact

gap

may

determined

turning

the

contact

shield

from

the

setting

position

until

the

contacts

just

CONTACT

CIRCUIT

CONSTANTS

Resistance

2.0

ampere

Contactor

Switch

Resistance

1.0

ampere

Target

Resistance

0.2

ampere

Target

0.25

ohms

0.16

ohms

2.8

ohms

Courtesy of NationalSwitchgear.com

771

TYPE

ITH

RELAY

One

turn

the

shield

equal

018

inch

con

tact

gap

circuit

The

contactor

switch

and

indicator

must

operate

with

the

application

the

current

and

the

contactor

switch

and

indicator

must

not

stick

the

The

factory

adjustment

the

position

the

plunger

steel

provides

drop

out

ratio

over

the

nominal

range

But

the

event

considerable

amount

material

removed

from

the

contacts

due

repeated

operations

burnishing

etc

the

drop

out

ratio

may

fall

below

this

occurs

the

plunger

steel

should

screwed

down

compensate

for

the

change

the

contact

gap

However

the

plunger

steel

changed

the

relay

must

recalibrated

The

following

procedure

should

used

recalibrate

the

relay

Set

the

core

screw

ten

turns

from

its

bottom

position

Adjust

the

plunger

steel

position

the

plunger

until

the

current

value

which

the

plunger

drops

out

the

maximum

rated

current

Then

set

the

contact

gap

turn

down

and

adjust

the

core

screw

for

pick

Drop

out

value

will

nor

mally

above

this

setting

desired

the

contact

gap

and

may

increased

lowering

the

contact

shield

and

readjusting

the

core

screw

for

pick

operated

position

when

the

current

interrupted

Indicating

Contactor

Switch

(

ICS

)

setting

required

the

ICS

unit

except

the

selection

the

0.2

2.0

ampere

tap

setting

This

selection

made

connecting

the

lead

located

front

the

tap

block

the

desired

setting

means

the

connecting

screw

ADJUSTMENT

AND

MAINTENANCE

ITH

Unit

Acceptance

—

The

plunger

assembly

should

pick

and

seal

within

and

dropout

higher

the

minimum

pick

current

value

stamped

the

frame

The

unit

should

maintain

least

drop

out

ratio

over

the

nominal

range

The

contact

gap

should

not

less

than

013

inch

Contact

gap

determined

described

under

SETTINGS

Contactor

Switch

Operation

Indicator

the

main

relay

contacts

and

pass

sufficient

current

through

the

trip

circuit

the

con

tacts

the

contactor

switch

This

value

current

should

not

greater

than

the

rating

the

contactor

switch

being

used

The

operation

indicator

target

should

drop

freely

For

Relays

with

Series

Trip

This

combination

uses

2.0

amp

contactor

switch

and

either

1.0

amp

0.2

amp

operation

indicator

connected

series

Adjust

the

contactor

switch

and

operation

indicator

outlined

below

Contoctor

Switch

Indicating

Contactor

Switch

(

ICS

)

Turn

the

relay

side

down

Screw

the

core

screw

until

the

contact

ring

starts

rotating

Now

back

off

the

core

until

the

contact

ring

stops

rotating

Back

off

the

core

screw

one

turn

and

lock

place

Adjust

the

two

nuts

the

bottom

the

switch

that

there

inch

clearance

between

the

moving

contact

ring

and

the

stationary

contacts

the

open

position

The

guide

rod

may

used

scale

has

threads

per

inch

therefore

turns

the

nut

will

equal

approximately

inch

Operotion

Indicotor

the

main

relay

contacts

and

pass

rated

indicator

current

through

the

trip

circuit

Adjust

the

operation

indicator

moving

the

flag

holder

such

that

the

indicator

operates

with

the

plication

the

current

the

main

relay

contacts

and

pass

sufficient

current

through

the

trip

circuit

the

con

tacts

the

ICS

This

value

current

should

not

greater

than

the

particular

ICS

tap

setting

being

used

The

operation

indicator

target

should

drop

freely

All

contacts

should

cleaned

periodically

contact

burnisher

182

836

recommended

for

this

purpose

The

use

abrasive

material

for

clean

ing

contacts

not

recommended

because

the

danger

embedding

small

particles

the

face

the

soft

silver

and

thus

impairing

the

contact

Repair

work

can

done

most

satisfactorily

the

factory

However

interchangeable

parts

can

furnished

the

customers

who

are

equipped

for

doing

repair

work

When

ordering

parts

always

give

the

complete

nameplate

data

Combination

Test

Pass

times

indicator

rating

through

the

trip

Courtesy of NationalSwitchgear.com

TYPE

ITH

RELAY

563

5.563

141.30

)

(

14.30

)

250

DIA

HOLES

FOR

190

MTS

SCREWS

(

6.35

)

6.063

154.00

)

1.594

(

40.49

)

2.781

(

70.64

)

3.625

i f

]

5.875

(

149.23

)

824

)

(

92.00

)

6.5

(

165.1

)

2.938

(

74.6

)

3.250

(

82.55

)

125

3.188

(

80.98

)

2.938

(

74.63

)

5.875

(

149.23

)

6.375

(

161.93

)

PANEL

LOCATION

SEMI

FLUSH

MTG

PROJECTION

MTG

PANEL

CUTOUT

DRILLING

FOR

SEMI

FLUSH

MTG

PILOT

PLATE

SNAP

RELAY

(

TAB

WHEN

USED

REAR

)

2.328

(

59.13

)

CASE

DIMENSIONS

INCHE

DIMENSIONS

LARGE

INTERNAL

EXTERNAL

TOOTH

WASHER

1.875

(

47.63

)

2.688

(

68.28

)

563

;

(

14.30

)

DIA

HOLES

5.375

(

136.53

)

SMALL

EXTERNAL

TOOTHED

WASHERS

190

SCREW

SPACER

SPACERS

FOR

THIN

PANELS

250

(

6.35

)

1.031

(

26.19

)

(

26.19

)

(

397

)

250

(

6.35

)

“

1.031

(

)

(

26.19

)

375

(

9.53

)

PANEL

SCREW

(

FOR

THICK

PANELS

(

150

USE

STUDS

)

—

)

1.0

(

25.4

)

INTERNAL

EXTERNAL

TOOTHED

WASHERS

(

46.05

)

2.0

(

50.8

)

190

SCREW

FOR

THICK

PANELS

USE

190

STUDS

’

CteOe

—

516

(

)

1.031

—

1.031

(

26.19

)

26.19

)

(

26.19

)

26.19

)

PANEL

DRILLING

CUTOUT

FOR

PROJECTION

MTG

(

FRONT

VIEW

)

750

TERMINAL

NUMBER

DIA

(

19.05

)

HOLES

CUTOUT

641

TERMINAL

AND

MOUNTING

DETAILS

DIA

(

16.28

)

Fig

Outline

and

Dri

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Courtesy of NationalSwitchgear.com

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