Plug Fuses
ꢀ
ꢀ
125 VAC Fast-Acting or Time-Delay 1/4 – 30 Amperes
DESCRIPTION
Edison-base plug fuses (WOO, TOO, and TLO series) have
threaded metal shells and contacts similar to incandescent
lamp bases. Fuseholders for Edison-base fuses have
matching metal threads similar to standard light sockets.
Type S fuses (SLO and SOO series) have nonmetallic
threaded bases which fit matching nonmetallic threads in
Type S fuseholders. Type S fuseholders are size-limiting, and
will not accept Type S fuses with ampere ratings greater than
the ampere rating marked on the Type S fuseholder. Type S
fuses will not fit Edison-base fuseholders, nor can Edison-
base fuses be used in Type S fuseholders.
GENERAL
PURPOSE
FUSES
Approvals: UL Listed plug fuses.
Note: Although rated at 125 volts, NEC permits plug fuses to
be used in circuits not exceeding 150 volts to ground. See
NEC Article 240-E.
SAO Type S Fuse Adapters inserted into Edison-base
fuseholders permanently convert them to Type S fuseholders.
They accept Type S fuses only.
SAO
Adapter
Rating
Other SOO
Fuse Ratings
Which Fit
Accepts
Fuse Ratings:
3
SAO 1
⁄
10 – 1
—
3
SAO 1-1/4
SAO 1-6/10
SAO 2
SAO 2-1/2
SAO 3-2/10
SAO 4
SAO 5
SAO 6-1/4
SAO 15
11⁄
8
, 11⁄
4
⁄
10 – 1
APPLICATIONS
14⁄10, 16⁄10
18⁄10, 2
⁄
10 – 11⁄
4
3
The National Electric Code now permits Edison-base fuses to
be used only for replacements in existing installations, and
then, only when there is no evidence of overfusing or
tampering. All new Edison-base fuseholders must have Type
S fuse adapters installed before they are placed in service.
Designed to prevent installation of wrong size fuses, Type S
Adapters (SAO series) screw into Edison-base fuseholders so
they may accept Type S fuses. Once installed the adapters
cannot be removed.
—
21⁄
4
, 21⁄
2
18⁄10, 2
28⁄10, 32⁄10
18⁄10 – 21⁄
2
31⁄
41⁄
31⁄
2, 4
—
2
, 5
31⁄
31⁄
2
, 4
– 5
2
, 61⁄
4
2
7, 8, 9, 10, 12, 14, 15
20 Only
7, 8, 9, 10
SAO 20
SAO 30
—
—
20, 25, 30
To prevent shunting of open fuses or overfusing, and to
reduce nuisance fuse opening, it is recommended that SAO
adapters with properly rated SLO or SOO series fuses be
installed in all Edison-base fuseholders.
HOLDERS
See Littelfuse box cover units in the Miscellaneous Products
section of this catalog.
EDISON-BASE PLUG FUSES
TYPE S PLUG FUSES
TOO Fuses are dual-element time-
delay Edison-base fuses designed for
motor and motor branch-circuit
protection; also suitable for all general-
purpose circuits. Use for replacement
purposes only.
WOO Fuses are non-delay Edison-
base fuses, best suited for incandes-
SOO Fuses are dual-element time-
delay Type S fuses designed for motor
and motor branch-circuit protection;
also suitable for all general-purpose
circuits.
cent lighting, resistance heating, and
general purpose circuits with no
significant motor load. Not recom-
mended for motor circuits. See TOO
and SOO fuses. Use for replacement
purposes only.
AMPERE RATINGS
AMPERE RATINGS
1
⁄
4
1
2
31⁄
2
61⁄
7
8
9
10
12
4
14
15
20
25
30
3
31⁄
2
61⁄
7
8
9
10
12
4
14
15
20
25
30
⁄
10
11⁄
8
21⁄
4
4
1
⁄
⁄10
4
1
2
AMPERE RATINGS
4
⁄10
11⁄
4
21⁄
28⁄10
3
2
41⁄
5
2
3
11⁄
8
21⁄
4
4
1
1
11⁄
4
21⁄
28⁄10
3
2
41⁄
5
2
⁄
2
2
3
5
6
8
10
15
20
25
30
⁄
2
14⁄10
16⁄10
18⁄10
4
⁄
⁄
10
6
14⁄10
16⁄10
18⁄10
1
⁄
10
56⁄10
6
1
2
8
56⁄10
6
⁄
10
32⁄10
6
⁄10
8
⁄10
32⁄10
TLO Fuses are medium time-delay
Edison-base fuses designed for
general-purpose branch-circuit
protection. See TOO and SOO fuses
for motor protection. Use for replace-
ment purposes only.
SLO Fuses are medium time-delay
Type S fuses for general-purpose
branch-circuit protection.
AMPERE RATINGS
15
20
25
30
AMPERE RATINGS
15
20
25
30
46
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