GEK-34054
TIME OVER CURRENT RELAYS
TYPES
IAC53A FORM
800
AND UP
IAC53B FORM
800
AND UP
IAC54A FORM
800
AND UP
IAC54B FORM
800
AND UP
DESCRIPTION
The Type IAC 5 3 and IAC 5 4 r elays cove r ed by the s e i ns tr u c ti ons a r e
extended-r a ng e ,
s i ngle - ph a s e
ti me
ov e r c u r r e n t
r e la ys
wi th
v e r y
i nv e r s e ti me/cu r r ent cha r a c te r is ti cs.
Some o f the type s cove r ed a lso
i n c lu d e
a
h i n g e d - t ype
i n s ta n ta n e o u s
un i t,
wh i c h
p r o v i d e s
i n s ta n ta neous
tr i pping at h i gh
cu r r ent levels .
Both
u ni ts
a r e
desc r i bed i n the s ection o n
CONSTRUCTION.
The d i f f e r e nces between r ela ys a r e noted i n the f ollowi ng table:
INSTANTANEOUS
CONTACT
INTERNAL
TYPE
UNIT
CIRCUITS
CONNECTIONS
IAC53A
NO
1
FIGURE 4
IAC53B
YES
1
FIGURE 5
IAC54A
NO
2
FIGURE 6
IAC54B
YES
2
FIGURE 7
Each r e la y i s e qui pped wi th a dual- r a ted ta r g e t seal- i n u n i t, and
is mounted in a s ta nda r d Sl case, the outli ne a nd mounti ng d i me ns i ons
of wh i ch a r e shown i n Fi g u r e s
12
and 13.
Both the ti me-delay a nd the i ns tanta neous u n i t a r e adjus table ove r a
r ange of a bou t 8 to 1.
The a va i lable r anges i n a mpe r es of both
un i ts, as well as i nf o r mation on the i r conti nuou s r a ti ng, conta c t
r a ti ng , a nd the tap r a ti ng s o f the i r ta r ge t/s eal- i n un i ts a r e g i ve n
i n
the
s e c tion on
RATINGS.
Inf o r ma tion on
the
ope ra ti ng - ti me
cha r a c teri s ti c s wi ll be found i n the sec tion on
CHARACTERISTICS.
These instructions do not purport to cover all details or variations in equipment nor provide for every
possible contingency to be mel in connection with installation, operation or maintenance. Should further
information be desired or should particular problems arise which are not covered sufficiently for the purchaser's
purposes, the matter should be referred to the General Electric Company.
To the extent required the products described herein meet applicable ANSI,
IEEE
and NEMA
standards; but no such assurance is given with respect to local codes and ordinances because they vary greatly.
3
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