Medium Voltage Fuses
British Standard IEC fuses for use in oil filled distribution
switchgear
OEFMA
Specifications
Description:
BS 2692-1 medium
voltage fuses for use on the primary
circuit of three-phase 50Hz trans-
formers in oil field switchgear. Fitted
with powerful pyrotechnic striker pin.
Ratings:
Volts: — 3.6-24kV
Amps: — 6.3-200A
IR: — 25-50kA (See Catalog Number table below)
Agency Information:
Fuses comply with IEC 60282-1,
BS2692-1 and ESI Standard 12-8. 7.2 and 12kV fuses tested
at highest system voltage and approved by the UK Electricity
Association approvals panel.
Featues and Benefits
• Physically sized for replacement of British Standard fuse
links
Typical Applications
• Medium Voltage BS designed equipment
Code Number Reference
O
Type
O = Oil tight
_
_
M
A
Diameter
E = 63.5mm
H = 63.5mm
L = 63.5mm
Length
F = 254mm
G = 359mm
Striker
M = As specified in BS 2692 table 11
Tags
A = None (plain caps)
Dimensions:
Current-limiting fuse for use in oil switchgear
Fuse types: OEF, OEG, OHF, OHG, OLG
254mm (10 in) or 359mm (14 in)
44
68 Max
63.5
Catalog Numbers
Transformer
kVA
200
250
300/315
400
500
630
750/800
1000
1250
1600
Catalog Numbers
Transformer Primary Voltage
3.3kV
6.6kV
3.6kV OEFMA 63
12kV OEFMA 31.5
3.6kV OEFMA 80
12kV OEFMA 40
3.6kV OEFMA 100
12kV OEFMA 50
3.6kV OEFMA 125
12kV OEFMA 63
3.6kV OEFMA 160
12kV OHFMA 71
3.6kV OEFMA 200
7.2kV OEFMA 100
3.6kV OLGMA 250
7.2kV OHGMA 125
3.6kV OLGMA 250*
7.2kV OHGMA 140
—
7.2kV OHGMA 160*
—
—
10 Min — 16 Max striker travel after operation, if fitted.
11kV/ESI 12-8 Ref.
12kV OEFMA 25/01
12kV OEFMA 25/—
12kV OEFMA31.5/02
12kV OEFMA 40/—
12kV OEFMA 50/03
12kV OEFMA 63/—
12kV OHFMA 80/04
12kV OHGMA 90**/05
12kV OHGMA 100/—
12kV OLGMA 125*/—
13.8kV
15.5kV
15.5kV
15.5kV
15.5kV
15.5kV
15.5kV
15.5kV
15.5kV
15.5kV
15.5kV
OEFMA 16
OEFMA 20
OEFMA 25
OEFMA 31.5
OEFMA 40
OEFMA 50
OEFMA 63
OHGMA 71
OHGMA 90
OLGMA 100*
This Catalog Number selection table is based upon the following criteria:
1. Withstand against magnetizing inrush current taken as 12 times full-load current for 0.1 second.
2. Withstand against 150% permissible overload current. Recommendations marked with asterisks have the following significance:-
*Limited to permissible overloads of 130%.
**Permits use of a 12kV OHFMA 80A fuse with a 100kVA transformer where permissible overload does not exceed 130%.
3. For 6.6kV systems, 12kV fuses are recommended where possible in the interests of standardization.
4. Wherever possible, 10 inch long FO1 fuses are offered rather than equivalent 14 inch FO2 types.
5. The above recommendations are not generally applicable to transformers feeding motor circuits with starting currents in excess of the transformer full load current. In this event, please consult
Cooper Bussmann.
Catalog Numbers
Basic Cat.
Number
OEFMA
OEGMA
OLGMA
OEFMA
OHGMA
OEFMA
OHFMA
OHGMA
OLGMA
OEFMA
OHGMA
OLGMA
OHGMA
OEGMA
Voltage
3.6kV
3.6kV
3.6kV
7.2kV
7.2kV
12.0kV
12.0kV
12.0kV
12.0kV
15.5kV
15.5kV
15.5kV
17.5kV
24.0kV
Dimensional
Ref. BS 2692
FO1
FO2
FO2
FO1
FO2
FO1
FO1
FO2
FO2
FO1
FO2
FO2
FO2
FO2
Amp Ratings
6.3, 10, 16, 20, 25,
100, 125, 160, 200
250
80, 100, 112
125, 140, 160
6.3, 10, 16, 20, 25,
71, 80
6.3, 10, 16, 20, 25,
125
6.3, 10, 16, 20, 25,
71, 80, 90
100
6.3, 10, 16, 20, 25,
6.3, 10, 16, 20, 25,
31.5, 40, 50, 63, 80, 100, 125, 160, 200
Breaking
Capacity (kA)
50
50
50
45
45
40
40
40
40
40
40
40
35
25
31.5, 40, 50, 63
31.5, 40, 50, 63, 71, 80, 90, 100
31.5, 40, 50, 63
Catalog Number Build-A-Code
kV
Basic
Amps
Catalog Number
___
_____
___
31.5, 40, 50, 63, 80
31.5, 40, 50
Contact Cooper Bussmann for complete specifications on medium voltage fuses.
84
For product Data Sheets, visit www.cooperbussmann.com/products/datasheet.asp
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