For detailed information, visit the Electrical IEC section at www.cooperbussmann.com
86
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
transformers 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
Catalog Numbers
BBaassiicc CCaatt.. DDiimmeennssiioonnaall BBrreeaakkiinngg
NNuummbbeerr VVoollttaaggee RReeff.. BBSS 22669922 AAmmpp RRaattiinnggss CCaappaacciittyy ((kkAA))
3.6OEFMA 3.6kV FO1 6.3, 10, 16, 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200 50
3.6OEGMA 3.6kV FO2 100, 125, 160, 200 50
3.6OLGMA 3.6kV FO2 250 50
7.2OEFMA 7.2kV FO1 80, 100, 112 45
7.2OHGMA 7.2kV FO2 125, 140, 160 45
12OEFMA 12.0kV FO1 6.3, 10, 16, 20, 25, 31.5, 40, 50, 63 40
12OHFMA 12.0kV FO1 71, 80 40
12OHGMA 12.0kV FO2 6.3, 10, 16, 20, 25, 31.5, 40, 50, 63, 71, 80, 90, 100 40
12OLGMA 12.0kV FO2 125 40
15.5OEFMA 15.5kV FO1 6.3, 10, 16, 20, 25, 31.5, 40, 50, 63 40
15.5OHGMA 15.5kV FO2 71, 80, 90 40
15.5OLGMA 15.5kV FO2 100 40
17.5OHGMA 17.5kV FO2 6.3, 10, 16, 20, 25, 31.5, 40, 50, 63, 80 35
24OEGMA 24.0kV FO2 6.3, 10, 16, 20, 25, 31.5, 40, 50 25
Contact Cooper Bussmann for complete specifications on medium voltage fuses.
Code Number Reference
O
_ _ M A
Type
O = Oil tight
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)
Catalog Number Build-A-Code
kV Basic Amps
Catalog Number
_ _ _ _ _ _ _ _ _ _ _
10 Min — 16 Max striker travel after operation, if fitted.
Dimensions:
Catalog Numbers
TTrraannssffoorrmmeerr
CCaattaalloogg NNuummbbeerrss//TTrraannssffoorrmmeerr PPrriimmaarryy VVoollttaaggee
kVA 3.3kV 6.6kV 11kV/ESI 12-8 Ref. 13.8kV
200 3.6OEFMA63 12OEFMA31.5 12OEFMA25/01 15.5OEFMA16
250 3.6OEFMA80 12OEFMA40 12OEFMA25/— 15.5OEFMA20
300/315 3.6OEFMA100 12OEFMA50 12OEFMA31.5/02 15.5OEFMA25
400 3.6OEFMA125 12OEFMA63 12OEFMA40/— 15.5OEFMA31.5
500 3.6OEFMA160 12OHFMA71 12OEFMA50/03 15.5OEFMA40
630 3.6OEFMA200 7.2OEFMA100 12OEFMA63/— 15.5OEFMA50
750/800 3.6OLGMA250 7.2OHGMA125 12OHFMA80/04 15.5OEFMA63
1000 3.6OLGMA250* 7.2OHGMA140 12OHGMA90**/05 15.5OHGMA71
1250 — 7.2OHGMA160* 12OHGMA100/— 15.5OHGMA90
1600 — — 12OLGMA125*/— 15.5OLGMA100*
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.
