ABB CRN-1 Manuel

Instruction

Leaflet

251.2

All

ABB

Power

Company

Inc

Relay

Divisions

Coral

Springs

33065

Type

CRN

Reverse

Power

Relay

and

Hertz

Effective

June

1991

Supersedes

251.2

Dated

April

1988

(

)

Denotes

Change

Since

Issue

2.2

Directional

Unit

(

)

The

directional

unit

product

induction

cylinder

type

unit

operating

the

interaction

between

the

polarizing

circuit

flux

and

the

operating

circuit

flux

Mechanically

the

directional

unit

composed

four

basic

components

die

cast

aluminum

frame

electromagnet

moving

element

assembly

and

molded

bridge

The

frame

serves

the

mounting

structure

for

the

magnetic

core

The

magnetic

core

which

houses

the

lower

bearing

secured

the

frame

locking

nut

The

bearing

can

replaced

necessary

with

out

having

remove

the

magnetic

core

from

the

frame

The

electromagnet

has

two

series

connected

polariz

ing

coils

mounted

diametrically

opposite

one

another

;

two

series

connected

operating

coils

mounted

dia

metrically

opposite

one

another

;

and

two

locating

pins

The

locating

pins

are

used

accurately

posi

tion

the

lower

bearing

which

mounted

the

frame

with

respect

the

upper

bearing

which

threaded

into

the

bridge

The

electromagnet

secured

the

frame

four

mounting

screws

The

moving

element

assembly

consists

spiral

spring

contact

carrying

member

and

aluminum

cylinder

assembled

molded

hub

which

holds

the

shaft

The

shaft

has

removable

top

and

bottom

jewel

bearings

The

shaft

rides

between

the

bottom

bearing

and

the

upper

bearing

with

the

cylinder

rotating

air

gap

formed

the

electromagnet

and

the

magnetic

core

The

stops

for

the

moving

ele

ment

contact

arm

are

integral

part

the

bridge

The

bridge

secured

the

electromagnet

and

frame

two

mounting

screws

addition

holding

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

properly

and

operate

the

relay

check

the

settings

and

electrical

connections

APPLICATION

The

type

CRN

relay

single

phase

directionally

controlled

timing

relay

used

protect

generators

from

motoring

When

such

condition

occurs

and

persists

for

predetermined

time

interval

the

gener

ator

may

tripped

alarm

sounded

The

CRN

may

also

used

sense

lagging

power

factor

load

flow

abnormal

direction

shown

Figure

The

directional

unit

has

maximum

torque

char

acteristics

and

the

timer

unit

adjustable

from

approximately

seconds

CONSTRUCTION

The

relay

consists

directional

unit

timing

unit

and

indicating

contactor

switch

unit

2.1

Timer

Unit

(

)

The

timer

unit

operates

the

induction

disc

princi

ple

main

coil

located

the

center

leg

“

”

type

laminated

structure

produces

flux

which

divides

and

returns

through

the

outer

legs

shading

coil

causes

the

flux

through

the

left

leg

(

front

view

)

lag

the

main

pole

flux

The

out

phase

fluxes

thus

produced

the

air

gap

causes

contact

closing

torque

similar

non

tapped

version

the

voltage

unit

the

Relay

(

see

201

)

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

Asea

Brown

Boveri

representative

should

contacted

Printed

Courtesy of NationalSwitchgear.com

251.2

Figure

Type

CRN

Relay

Without

Case

Directional

Unit

(

)

Timer

Unit

(

)

Indicating

Contac

tor

Switch

(

ICS

)

INTERNAL

SCHEMATIC

rfUNAL

KMOunc

•

TIMER

UNIT

lima

wit

•

OlCAIlBO

cot

IOI

DIRECTIONAL

UNIT

OiUCTIOBAL

wit

until

oniitia

UOtllit

lailtj

CHASSIS

OPERATED

SHORTING

SWITCH

—

uuu

HIT

MITCO

UillUI

list

JACI

’

RED

HANDLE

TEST

SWITCH

CURRENT

TEST

JACK

(

”

(

HMlIll

—

TERMINAL

naff

vim

FRONT

VIEW

Sub

876

220

118

KUTIVf

IIIIUTUIOUI

NUIIII

UCH

Tit

ontctiftm

ttiucu

CLOU

Sub

184

404

WITH

RELATIVE

INSTANTANEOUS

POLARITY

SHOWN

THE

DIRECTONAL

CONTACTS

Figure

Internal

Schematic

the

Single

Trip

Type

CRN

Relay

Without

ICS

Unitin

the

CAse

Figure

Internal

Schematic

the

Single

Trip

Type

CRN

Relay

the

Case

Courtesy of NationalSwitchgear.com

251.2

ttfTtJMUl

mCHJTlC

•

105

VOLTS

TIHU

KBIT

UJlCilUC

TICI

(

STMltB

ICS

oiucnoRii

UKIT

VOLTS

120

VOLTS

ICS

”

125

VOLTS

CHASSIS

OMIAICP

JnOtriiO

SilTCH

•

TEST

SWITCH

CUAUar

TEST

JACI

”

’

(

23456789

1 0

I I

moot

view

Sub

184

547

Sub

184

405

IBSTABTAMOSIS

fOUAI

SHOVK

THE

PLMGTLOBAL

COaTACTS

TIME

DIAL

POSITION

Figure

Typical

Time

Curves

the

Timer

Unit

the

120

volt

Type

CRN

Relay

Propor

tional

voltages

apply

for

the

208

and

240

volt

relay

The

front

spring

addition

holding

the

target

pro

vides

restrain

for

the

armature

and

thus

controls

the

pickup

value

the

switch

CHARACTERISTICS

The

type

CRN

relay

available

with

either

120

208

240

volt

rating

3.1

Timer

Unit

(

)

The

timer

unit

rated

120

208

240

volts

hertz

The

minimum

operate

value

rated

voltage

The

continuous

overvoltage

capability

110

rated

voltage

Characteristic

time

curves

are

shown

Figure

for

various

voltages

and

time

dial

settings

3.2

Directional

Unit

(

)

The

directional

unit

has

its

maximum

torque

when

the

current

leads

the

voltage

The

relay

should

connected

using

the

connection

When

using

this

connection

the

maximum

torque

the

relay

occurs

100

The

pickup

value

amp

rated

voltage

and

maximum

torque

angle

The

pickup

may

increased

amp

higher

increasing

the

spring

tension

3.3

Trip

Circuit

The

main

contacts

will

safely

dose

amperes

250

volts

and

the

seal

contacts

the

indicating

contactor

switch

will

safely

carry

this

current

long

enough

trip

circuit

breaker

Figure

Internal

Schematic

the

Double

Trip

Type

CRN

Relay

the

Case

the

upper

bearing

the

bridge

used

for

mount

ing

the

adjustable

stationary

contact

housing

The

stationary

contact

housing

held

position

spring

type

clamp

The

spring

adjuster

located

the

underside

the

bridge

and

attached

the

moving

contact

arm

spiral

spring

The

spring

adjuster

also

held

place

spring

type

clamp

With

the

contacts

closed

the

electrical

connection

made

through

the

stationary

contact

housing

clamp

the

moving

contact

through

the

spiral

spring

out

the

spring

adjuster

clamp

The

timer

unit

cannot

energized

unless

the

power

flow

the

tripping

direction

because

its

potential

coil

connected

series

with

the

contacts

the

directional

unit

Hence

the

relay

directionally

con

trolled

2.3

Indicating

Contactor

Switch

unit

(

ICS

)

The

indicator

contactor

switch

small

clapper

type

device

magnetic

armature

which

leaf

spring

mounted

contacts

are

attached

attracted

the

magnetic

core

upon

energizing

the

switch

When

the

switch

closes

the

moving

contacts

bridge

two

stationary

contacts

completing

the

trip

circuit

Also

during

this

operation

two

fingers

the

arma

ture

deflect

spring

located

the

front

the

switch

which

allows

the

operation

indicator

target

drop

The

target

reset

from

the

outside

the

case

push

rod

located

the

bottom

the

cover

Courtesy of NationalSwitchgear.com

251.2

The

indicating

contactor

switch

has

two

taps

that

pro

vide

pickup

setting

0.2

amperes

change

taps

requires

connecting

the

lead

located

front

the

tap

block

the

desired

setting

means

screw

connection

For

detail

information

the

case

refer

076

For

correct

operation

the

type

CRN

relay

should

connected

that

maximum

torque

occurs

for

unity

power

factor

the

system

Since

the

direc

tional

unit

has

characteristic

this

may

accomplished

using

the

connections

shown

Figure

The

voltage

operated

timer

unit

should

connected

across

the

line

External

schematic

for

this

applica

tion

shown

Figure

ADJUSTMENTS

AND

MAINTENANCE

The

proper

adjustments

insure

correct

operation

this

relay

have

been

made

the

factory

and

should

not

disturbed

after

receipt

the

customer

the

adjustments

have

been

changed

the

relay

taken

apart

for

repairs

desired

check

the

adjust

ments

regular

maintenance

periods

the

instruc

tions

Section

6.1

“

Acceptance

Check

”

should

followed

All

contacts

should

cleaned

periodically

contact

burnisher

Style

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

6.1

Acceptance

Check

The

following

check

recommended

insure

that

the

relay

proper

working

order

Timer

Unit

(

)

The

directional

unit

contacts

must

the

closed

position

when

checking

the

operation

the

timer

unit

Contact

turning

the

time

dial

move

the

moving

con

tacts

until

they

deflect

the

stationary

contact

position

where

the

stationary

contact

resting

against

its

backstop

The

index

mark

located

the

movement

frame

should

coincide

with

the

“

”

mark

the

time

dial

For

double

trip

relays

the

stationary

contacts

should

approximately

”

For

relays

identified

with

“

located

lower

left

stationary

contact

block

the

index

mark

the

movement

frame

will

coincide

with

the

“

”

mark

the

time

dial

when

the

stationary

contact

has

moved

through

approximately

one

half

its

3.4

Trip

Circuit

Constant

Indicating

Contact

Switch

(

ICS

)

0.2

ampere

tap

6.5

ohms

resistance

2.0

amperes

tap

0.15

ohm

resistance

SETTINGS

There

only

one

setting

determined

This

the

time

delay

the

voltage

operated

timer

and

adjusted

the

time

dial

position

Figure

gives

curve

time

delay

time

dial

setting

for

various

impressed

voltages

Time

approximately

propor

tional

time

dial

setting

4.1

Indicating

Contactor

Switch

(

ICS

)

setting

required

the

ICS

unit

except

the

selection

the

0.2

2.0

amperes

tap

setting

This

selection

made

connecting

the

lead

located

front

the

tap

block

the

desired

setting

means

the

connecting

screw

When

the

relay

energizes

125

250

volt

type

relay

switch

equiva

lent

use

the

0.2

ampere

tap

INSTALLATION

The

relays

should

mounted

switchboard

pan

els

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

holes

the

flange

for

the

semi

flush

type

case

Either

the

stud

the

mounting

screws

may

utilized

for

grounding

the

relay

Exter

nal

toothed

washers

are

provided

for

use

the

loca

tions

shown

the

outline

and

drilling

plan

facilitate

making

good

electrical

connection

between

the

relay

case

its

mounting

screws

studs

and

the

relay

panels

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

Courtesy of NationalSwitchgear.com

251.2

RELAY

TRIPS

FOR

POWER

FLOW

THIS

DIRECTION

PHASE

ROTATION

TRIP

BUS

POS

NOTE

GROUNO

MAY

SUBSTITUTED

FOR

EITHER

LOW

SIOE

FUSE

ICS

[

ics

;

NEC

DIRECTIONAL

TIMING

UNIT

DEVICE

NUMBER

CHART

REVERSE

POWER

RELAY

TYPE

CRM

DIRECTIONAL

ELEMENT

CRN

TIMER

CRN

POWER

CIRCUIT

BREAKER

ICS

INDICATING

CONTACTOR

SWITCH

BREAKER

TRIP

COIL

BREAKER

AUXILIARY

CONTACT

ZERO

TORQUE

LINE

CLOSING

ZONE

Sub

184

466

Figure

External

Schematic

the

Type

CRN

for

Reverse

Power

Protection

TRIP

DIRECTION

ABC

GENERATION

—

PHASE

ROTATION

UTILITY

SYSTEM

POWER

TRANSFORMER

TIE

STATION

BUS

NCTE

GROUND

MAYBE

SUBSTITUTED

FOR

EJTHES

LOW

SIDE

FUSE

TRIP

BUS

POS

Tii

ilO

•

DEVICE

NUMBER

CHART

CLOSING

ZONE

DIRECTIONAL

UNIT

MAX

TORQUE

WHENIA

LEADS

VBC

Til

—

REVERSE

POWER

RELAY

TYPE

CHI

DIRECTIONAL

ELEMENT

CRN

TIMER

CRN

CIRCUIT

BREAKER

ICS

INDICATIMC

CONTACTOR

SNITCH

BREAKER

TRIP

COIL

BREAKER

AUXILIARY

CONTACT

TIMING

UNIT

ZERO

TORQUE

Sub

849

137

LINE

NEG

Figure

External

Schematic

the

CRN

Relay

Prevent

Reverse

Magnetization

When

Utility

Tie

Removed

From

the

Local

System

Courtesy of NationalSwitchgear.com

251.2

normal

deflection

Therefore

with

the

stationary

contact

resting

against

the

backstop

the

index

mark

offset

the

right

the

“

”

mark

approximately

020

”

The

placement

the

vari

ous

time

dial

positions

line

with

the

index

mark

will

give

operating

times

shown

the

respec

tive

time

voltage

curves

For

double

trip

relays

the

stationary

contacts

should

approximately

”

Minimum

Operate

Voltage

Set

the

time

dial

position

Alternately

apply

rated

voltage

plus

and

minus

The

moving

contact

should

leave

the

backstop

plus

and

should

return

the

backstop

minus

6.1

Directional

Unit

(

)

Contact

Gap

The

gap

between

the

stationary

contact

and

moving

contact

with

the

relay

energized

position

should

approximately

022

”

Sensitivity

The

respective

directional

units

should

trip

with

value

energization

and

phase

angle

relation

ships

indicated

Table

The

pickup

may

increased

amp

higher

increasing

the

spring

tension

6.2

Routine

Maintenance

All

relays

should

inspected

periodically

and

the

time

operation

should

checked

least

once

every

year

such

other

time

intervals

may

dictated

experience

suitable

the

particular

application

Phantom

loads

should

not

used

testing

induction

type

relays

because

the

resulting

distorted

current

wave

form

which

produces

error

timing

Time

Curve

Figure

shows

the

time

curve

for

the

CRN

relay

With

the

time

dial

set

the

indicated

posi

tion

apply

the

voltages

specified

and

measure

the

operating

time

the

relay

The

operating

times

should

equal

those

Figure

plus

minus

All

contacts

should

periodically

cleaned

contact

burnisher

Style

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

6.1

Indicating

Contactor

Switch

(

ICS

)

the

main

relay

contacts

and

pass

sufficient

current

through

the

trip

circuit

the

contacts

the

ICS

This

value

current

should

not

greater

than

the

particular

ICS

tap

setting

being

used

The

indicator

target

should

drop

freely

6.3

Calibration

Use

the

following

procedure

for

calibrating

the

relay

the

relay

has

been

taken

apart

for

repairs

the

adjustments

have

been

disturbed

This

procedure

should

not

used

unless

apparent

that

the

relay

not

proper

working

order

(

See

Section

6.1

“

Acceptance

Check

”

)

The

contact

gap

should

approximately

047

between

the

bridging

moving

contact

and

the

adjust

able

stationary

contacts

The

bridging

moving

con

tact

should

touch

both

stationary

contacts

simultaneously

TABLE

DIRECTIONAL

UNIT

SENSITIVITY

Values

for

Min

Pick

Amperes

Relay

Type

Ratings

Volts

Phase

Angle

Relationship

Volts

leading

phase

with

CRN

120

208

240

Rated

020

023

The

energization

quantities

are

input

quantities

the

relay

terminals

Maximum

torque

angle

Courtesy of NationalSwitchgear.com

251.2

6.4

Minimum

Operate

Voltage

The

adjustment

the

spring

tension

setting

the

minimum

operate

voltage

the

relay

most

conve

niently

made

with

the

damping

magnet

removed

the

directional

contacts

With

the

time

dial

set

“

”

wind

the

spiral

spring

means

the

spring

adjuster

until

approxi

mately

convolutions

show

Set

the

relay

dial

position

Adjust

the

control

spring

tension

that

the

moving

contact

will

leave

the

backstop

volts

1.0

and

will

return

the

backstop

volts

1.0

This

value

for

the

120

volt

relay

Proportional

voltage

apply

for

the

208

and

240

volt

relay

6.5

Time

Curve

Calibration

Install

the

permanent

magnet

Set

the

time

dial

position

Apply

rated

voltage

terminals

and

with

the

directional

contacts

closed

Adjust

the

permanent

magnet

keeper

until

the

operating

time

seconds

6.6

Indicating

Contactor

Switch

Unit

(

ICS

)

the

main

relay

contacts

and

pass

sufficient

current

through

the

trip

circuit

the

contacts

the

ICS

This

value

current

should

not

greater

than

the

particular

ICS

tap

setting

being

used

The

indicator

target

should

drop

freely

6.7

Directional

Unit

(

)

The

upper

bearing

should

screwed

down

until

there

approximately

025

”

clearance

between

and

the

top

shaft

bearing

The

upper

bearing

should

then

securely

locked

position

with

the

locknut

The

lower

bearing

position

fixed

and

can

not

adjusted

The

contact

gap

adjustment

for

the

directional

unit

made

follows

With

the

moving

contact

the

normally

opened

posi

tion

against

the

right

stop

bridge

screw

the

stationary

contact

until

both

contacts

just

indicated

neon

lamp

the

contact

circuit

Then

screw

the

stationary

contact

away

from

the

moving

contacts

turn

The

clamp

holding

the

stationary

contact

housing

need

not

loosened

for

the

adjustment

since

the

clamp

utilizes

spring

type

action

holding

the

sta

tionary

contact

position

HOTS

Mil

kill

HUT

CMTACT

OPCIS

TIMCI

STOP

KCUT

—

UNO

AITS

TIMCI

MCI

MlTCM

STAIT

CLOUS

CUT

(

flOAT

TlCl

)

•

LOCK

CLOSED

TICS

ooopi

® ®

[

(

”

)

POTClTlOCTU

TEST

SIITCI

SSPPLT

Sub

184

368

Figure

Test

Connections

for

the

Timer

Unit

the

Type

CRN

Relay

the

Type

Case

6.3

Timer

Unit

(

)

Contact

turning

the

time

dial

move

the

moving

con

tacts

until

they

deflect

the

stationary

contact

position

where

the

stationary

contact

resting

against

its

backstop

The

index

mark

located

the

movement

frame

should

coincide

with

the

“

”

mark

the

time

dial

For

double

trip

relays

the

stationary

contacts

should

approximately

”

For

relays

identified

with

“

”

located

lower

left

stationary

contact

block

the

index

mark

the

movement

frame

will

coincide

with

the

“

”

mark

the

time

dial

when

the

stationary

contact

has

moved

through

approximately

one

half

its

normal

deflection

Therefore

with

the

stationary

contact

resting

against

the

backstop

the

index

mark

offset

the

right

the

“

”

mark

approximately

020

”

The

placement

the

vari

ous

time

dial

positions

line

with

the

index

mark

will

give

operating

times

shown

the

respec

tive

time

voltage

curves

For

double

trip

relays

the

stationary

contacts

should

approximately

”

Courtesy of NationalSwitchgear.com

251.2

polarizing

circuit

the

maximum

torque

angle

when

the

circuit

relationship

has

the

operating

and

polarizing

circuits

phase

recommended

that

single

phase

(

phase

relationship

)

set

used

matter

ease

and

convenience

The

set

screw

the

stationary

contacts

have

been

factory

adjusted

for

optimum

and

thus

adjust

ment

should

not

disturbed

The

moving

contact

assembly

has

been

factory

adjusted

for

low

contact

bounce

performance

and

should

not

changed

6.8

Maximum

Torque

Adjustment

Apply

rated

voltage

terminals

and

amperes

terminals

and

making

sure

the

polar

ities

are

correct

With

the

voltage

and

current

phase

the

contacts

should

Now

adjust

the

angle

between

current

and

voltage

120

(

current

leading

the

voltage

)

Adjust

the

resistor

just

the

contacts

Contacts

should

open

when

the

angle

between

current

and

voltage

120

leading

The

sensitivity

adjustment

made

varying

the

tension

the

spiral

spring

attached

the

moving

element

assembly

The

spring

adjusted

placing

screwdriver

similar

tool

into

one

the

notches

located

the

periphery

the

spring

adjuster

and

rotating

The

spring

adjuster

located

the

underside

the

bridge

and

held

place

spring

type

clamp

that

does

not

have

loosened

prior

making

the

necessary

adjustments

The

spring

adjusted

such

that

the

contacts

will

indicated

neon

lamp

the

contact

circuit

when

energized

with

the

required

current

and

voltage

shown

Table

This

table

indicates

that

the

spring

can

adjusted

when

the

phase

angle

relationship

between

the

operating

circuit

and

the

RATINGS

Circuit

Continuous

Voltage

100

Rating

Current

Amperes

ENERGY

REQUIREMENTS

The

and

hertz

burden

the

units

the

type

CRN

relay

are

follows

Volt

Power

Burden

Amperes

Factor

Coil

Rated

Voltage

6.5

Timer

Directional

Potential

Rated

Voltage

3.5

Directional

Current

Amperes

Angle

that

current

lags

the

voltage

5.5

RENEWAL

PARTS

Repair

work

can

done

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

Courtesy of NationalSwitchgear.com

PANEL

DRILLING

RND

CUTOUT

FOR

SEMI

FLUSH

MTG

CASE

OUTLINE

5.563

(

141.30

)

2.781

(

70.64

)

6.063

(

154.00

)

1.594

•

(

40.49

)

250

DIR

(

6.35

)

HOLES

FOR

190

MTG

SCREWS

5.119

(

132.56

)

563

(

14.30

)

9.668

(

246.08

)

9.063

(

230.20

)

CRSE

4.844

(

123.04

)

10.438

(

265.13

)

4.531

(

115.09

)

LARGE

INTERNAL

AND

EXTERNAL

TOOTH

WASHER

190

SCREW

SEMI

FLUSH

MTG

3.188

(

80.98

)

125

(

3.18

)

SMALL

EXTERNAL

TOOTH

WASHER

•

2.938

(

74.63

)

5.875

(

149.23

)

PROJECTION

MTG

6.375

(

161.93

)

PANEL

LOCATIONS

PANEL

DRILLING

CUTOUT

FOR

TERMINAL

AND

MTG

DETHILS

PROJECTION

MTG

(

FRONT

VIEW

)

FOR

PROJECTION

MTG

PANEL

2.688

•

(

68.28

)

563

DIR

(

14.29

)

HOLES

CRSE

SPACERS

FOR

THIN

PANELS

SCREW

(

FOR

THICK

PANELS

[

USE

STUDS

)

INTERNAL

EXTERNAL

TOOTH

WASHERS

1.344

(

34.14

)

5.375

•

(

136.53

)

397

NOTE

PROJECTION

HARDWARE

MUST

ORDERED

SEPARATELY

250

(

6.350

)

190

SCREW

1.031

“

(

26.19

)

1.344

(

34.14

)

375

(

9.53

)

FOR

THICK

PANELS

USE

190

STUDS

TYP

594

1.0

(

15.09

)

(

25.4

)

1.813

(

46.05

)

2.0

DIA

(

16.20

)

PANCL

(

50.8

)

DIMENSIONS

INCHES

(

DIMENSIONS

MILLIMETERS

)

TERMINAL

NUMBER

516

(

13.11

)

750

DIA

(

19.05

)

HOLES

CUTOUT

Sub

7901

1.031

(

26.19

)

TYP

Figure

Outline

and

Drilling

Plan

for

the

Type

CRN

Relay

the

Type

Case

Courtesy of NationalSwitchgear.com

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