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Distribution Transformer Protection

Sure Guard 9F59U Series ETP Fuses

8.3kV / 15.5kV / 23.0kV ETP fuses

The Sure Guard ETP back-up current-limiting fuses are designed to protect

distribution transformers and are used in series with another protective device (such

as an expulsion fuse). This combination limits the high-fault current to a safe level,

thus providing protection through the complete range. As its name implies, the “ETP”

is for External Transformer Protection. For conventional transformers protected by

expulsion-fuses cutouts, the ETP can be installed in series with the cutout. For self

protected transformers, the ETP can be applied on the high-voltage bushing in series

with the internal transformer expulsion fuse.

Features/Benefits:

•

Various hardware options.

•

Current-limiting for superior equipment protection.

•

High fault current interrupting capability: I.R. Sym = 50kA at ETP voltage rating.

Highlights:

•

Outdoor use

Applications:

•

Overhead distribution systems

Ratings:

9F50UBC:

Volts

: 8.3kV AC

: 15.5kV AC

: 23.0kV AC

9F50UBD:

Volts

9F50UBE:

Definitions:

Back-up Current-Limiting Fuses:

A back-up current-limiting fuse is a fuse that can interrupt any current between its rated

minimum interrupting current and its maximum interrupting current. Back-up fuses are

not designed or intended to open under overload conditions.

Hardware Options:

Catalog No. Suitable

for Parallel Application

Catalog Number

9F59UBC208

9F59UBC218

9F59UBC228

Max kV

8.3

15.5

Fig. 1. Adapter only

9F59AAW007

Fig. 2. Eyebolt only,

for 6-2/0 cable

9F59AAW008

9F59UBC238

9F59UBC248

9F59UBC258

9F59UBC268

9F59UBC278

9F59UBC288

9F59UBD208

9F59UBD218

9F59UBD228

9F59UBD238

9F59UBD248

9F59UBD258

9F59UBD268

Fig. 3. Parallel groove only,

for 2/0 to 250MCM cable

9F59AAW009

9F59UBD278

9F59UBD288

E44

Distribution Transformer Protection

Sure Guard 9F59U Series ETP Fuses

Sure Guard rated 8.3kV

Catalog No.

9F59UBC101

9F59UBC111

9F59UBC121

9F59UBC131

9F59UBC201

9F59UBC211

9F59UBC221

9F59UBC231

9F59UBC241

9F59UBC251

9F59UBC261

9F59UBC271

9F59UBC281

9F59UBC102

9F59UBC112

9F59UBC122

9F59UBC132

9F59UBC202

9F59UBC212

9F59UBC222

9F59UBC232

9F59UBC242

9F59UBC252

9F59UBC262

9F59UBC272

9F59UBC282

9F59UBC104

9F59UBC114

9F59UBC124

9F59UBC134

9F59UBC204

9F59UBC214

9F59UBC224

9F59UBC234

9F59UBC244

9F59UBC254

9F59UBC264

9F59UBC274

9F59UBC284

9F59UBC208

9F59UBC218

9F59UBC228

9F59UBC238

9F59UBC248

9F59UBC258

9F59UBC268

9F59UBC278

9F59UBC288

ETP Rating

8.3, Spade & Stud

8.3, Spade & Spade

8.3, Spade & Stud

8.3, Spade & Spade

8.3, Spade & Stud

8.3, Spade & Spade

ETP Hardware

Without Hardware

(1) Adapter

(1) Eyebolt Terminal

(1) Parallel Groove

Without Hardware

(1) Adapter

(1) Eyebolt Terminal

(1) Parallel Groove

Adapter & eyebolt terminal

Adapter & parallel groove

Eyebolt terminal & parallel groove

(2) Eyebolt terminals

(2) Parallel groove

Without Hardware

(1) Adapter

(1) Eyebolt Terminal

(1) Parallel Groove

Without Hardware

(1) Adapter

(1) Eyebolt Terminal

(1) Parallel Groove

Adapter & eyebolt terminal

Adapter & parallel groove

Eyebolt terminal & parallel groove

(2) Eyebolt terminals

(2) Parallel groove

Without Hardware

(1) Adapter

(1) Eyebolt Terminal

(1) Parallel Groove

Without Hardware

(1) Adapter

(1) Eyebolt Terminal

(1) Parallel Groove

Adapter & eyebolt terminal

Adapter & parallel groove

Eyebolt terminal & parallel groove

(2) Eyebolt terminals

(2) Parallel groove

Without Hardware

(1) Adapter

(1) Eyebolt Terminal

(1) Parallel Groove

Adapter & eyebolt terminal

Adapter & parallel groove

Eyebolt terminal & parallel groove

(2) Eyebolt terminals

(2) Parallel groove

Recommended

kV Class

Max. Expulsion

8T or 12K

15T or 25K

25T or 40K

50T or 80K

Max. Total Min. I.C.

16000

50000

140000

88000

Min. Melt

Total

Clear Curve

GES-8229B

Let-

through

Curve

GET-6693A

Amperes Curve

440

450

560

1200

GES-8228B

GET-6693A

For the most current product performance data visit

ep-us.mersen.com

and use catalog search.

E45

GET-6693A

Distribution Transformer Protection

Sure Guard 9F59U Series ETP Fuses

Sure Guard rated 15.5kV

Catalog No.

9F59UBD101

9F59UBD111

9F59UBD121

9F59UBD131

9F59UBD201

9F59UBD211

9F59UBD221

9F59UBD231

9F59UBD241

9F59UBD251

9F59UBD261

9F59UBD271

9F59UBD102

9F59UBD112

9F59UBD122

9F59UBD132

9F59UBD202

9F59UBD212

9F59UBD222

9F59UBD232

9F59UBD242

9F59UBD252

9F59UBD262

9F59UBD272

9F59UBD282

9F59UBD104

9F59UBD114

9F59UBD124

9F59UBD134

9F59UBD204

9F59UBD214

9F59UBD224

9F59UBD234

9F59UBD244

9F59UBD254

9F59UBD264

9F59UBD274

9F59UBD284

9F59UBD208

9F59UBD218

9F59UBD228

9F59UBD238

9F59UBD248

9F59UBD258

9F59UBD268

9F59UBD278

9F59UBD288

ETP Rating

15.5, Spade & Stud

15.5, Spade & Spade

15.5, Spade & Stud

15.5, Spade & Spade

15.5, Spade & Stud

15.5, Spade& Stud

15.5, Spade & Stud

15.5, Spade & Spade

ETP Hardware

Without Hardware

(1) Adapter

(1) Eyebolt Terminal

(1) Parallel Groove

Without Hardware

(1) Adapter

(1) Eyebolt Terminal

(1) Parallel Groove

Adapter & eyebolt terminal

Adapter & parallel groove

Eyebolt terminal & parallel groove

(2) Eyebolt terminals

Without Hardware

(1) Adapter

(1) Eyebolt Terminal

(1) Parallel Groove

Without Hardware

(1) Adapter

(1) Eyebolt Terminal

(1) Parallel Groove

Adapter & eyebolt terminal

Adapter & parallel groove

Eyebolt terminal & parallel groove

(2) Eyebolt terminals

(2) Parallel groove

Without Hardware

(1) Adapter

(1) Eyebolt Terminal

(1) Parallel Groove

Without Hardware

(1) Adapter

(1) Eyebolt Terminal

(1) Parallel Groove

Adapter & eyebolt terminal

Adapter & parallel groove

Eyebolt terminal & parallel groove

(2) Eyebolt terminals

(2) Parallel groove

Without Hardware

(1) Adapter

(1) Eyebolt Terminal

(1) Parallel Groove

Adapter & eyebolt terminal

Adapter & parallel groove

Eyebolt terminal & parallel groove

(2) Eyebolt terminals

(2) Parallel groove

Class

Recommended

Max. Expulsion

8T or 12K

15T or 25K

25T or 40K

50T or 80K

Max. Total

Min. I.C.

Amperes

510

480

890

1200

Min. Melt

Curve

GES-8228B

Total

Clear Curve

GES-8229B

Let-through

Curve

GET-6693A

16000

50000

140000

88000

E46

Distribution Transformer Protection

Sure Guard 9F59U Series ETP Fuses

Sure Guard rated 23.0kV

Catalog No.

9F59UBE101

9F59UBE111

9F59UBE121

9F59UBE131

9F59UBE201

9F59UBE211

9F59UBE221

9F59UBE231

9F59UBE241

9F59UBE251

9F59UBE261

9F59UBE271

9F59UBE281

9F59UBE102

9F59UBE112

9F59UBE122

9F59UBE132

9F59UBE202

9F59UBE212

9F59UBE222

9F59UBE232

9F59UBE242

9F59UBE252

9F59UBE262

9F59UBE272

9F59UBE282

ETP Rating

23.0, Spade & Stud

23.0, Spade & Spade

23.0, Spade & Stud

23.0, Spade & Spade

ETP Hardware

Without Hardware

(1) Adapter

(1) Eyebolt Terminal

(1) Parallel Groove

Without Hardware

(1) Adapter

(1) Eyebolt Terminal

(1) Parallel Groove

Adapter & eyebolt terminal

Adapter & parallel groove

Eyebolt terminal & parallel groove

(2) Eyebolt terminals

(2) Parallel groove

Without Hardware

(1) Adapter

(1) Eyebolt Terminal

(1) Parallel Groove

Without Hardware

(1) Adapter

(1) Eyebolt Terminal

(1) Parallel Groove

Adapter & eyebolt terminal

Adapter & parallel groove

Eyebolt terminal & parallel groove

(2) Eyebolt terminals

(2) Parallel groove

Class

Recommended

Max. Expulsion

8T or 12K

15T or 25K

Max. Total

Minimum

I.C. Amperes

280

460

Min. Melt Curve

GES-8228B

Total

Clear Curve

GES-8229A

Let-through

Curve

GET-6693B

16000

70000

For the most current product performance data visit

ep-us.mersen.com

and use catalog search.

E47