For Use in Oil Filled Distribution Switchgear
OEFMA
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
Dimensions:
Current-limiting fuse for use in oil switchgear
Fuse types: OEF, OEG, OHF, OHG, OLG
![](/uploads/spec-pics/201304/OEFMA-dimensions.jpg)
Code Number Reference
![](/uploads/spec-pics/201304/OEFMA-code-number-reference.jpg)
Catalog Numbers
Transformer | Catalog Numbers/Transformer Primary Voltage | |||
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* |
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 or Bolfmax.
Catalog Numbers
Basic Cat. Number | Voltage | Dimensional Ref.BS 2692 | Amp Ratings | Breaking Capacity(kA) |
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 |
Catalog Number Build-A-Code
![](/uploads/spec-pics/201304/OEFMA-build-a-code.jpg)
3.6OEFMA6.3 | 3.6OEGMA200 | 12OHFMA71 | 15.5OEFMA10 | 17.5OHGMA31.5 |
3.6OEFMA10 | 3.6OLGMA250 | 12OHFMA80 | 15.5OEFMA16 | 17.5OHGMA40 |
3.6OEFMA16 | 7.2OEFMA80 | 12OHGMA6.3 | 15.5OEFMA20 | 17.5OHGMA50 |
3.6OEFMA20 | 7.2OEFMA100 | 12OHGMA10 | 15.5OEFMA25 | 17.5OHGMA63 |
3.6OEFMA25 | 7.2OEFMA112 | 12OHGMA16 | 15.5OEFMA31.5 | 17.5OHGMA80 |
3.6OEFMA31.5 | 7.2OHGMA125 | 12OHGMA20 | 15.5OEFMA40 | 24OEGMA6.3 |
3.6OEFMA40 | 7.2OHGMA140 | 12OHGMA25 | 15.5OEFMA50 | 24OEGMA10 |
3.6OEFMA50 | 7.2OHGMA160 | 12OHGMA31.5 | 15.5OEFMA63 | 24OEGMA16 |
3.6OEFMA63 | 12OEFMA6.3 | 12OHGMA40 | 15.5OHGMA71 | 24OEGMA20 |
3.6OEFMA80 | 12OEFMA10 | 12OHGMA50 | 15.5OHGMA80 | 24OEGMA25 |
3.6OEFMA100 | 12OEFMA16 | 12OHGMA63 | 15.5OHGMA90 | 24OEGMA31.5 |
3.6OEFMA125 | 12OEFMA20 | 12OHGMA71 | 15.5OLGMA100 | 24OEGMA40 |
3.6OEFMA160 | 12OEFMA25 | 12OHGMA80 | 17.5OHGMA6.3 | 24OEGMA50 |
3.6OEFMA200 | 12OEFMA31.5 | 12OHGMA90 | 17.5OHGMA10 | |
3.6OEGMA100 | 12OEFMA40 | 12OHGMA100 | 17.5OHGMA16 | |
3.6OEGMA125 | 12OEFMA50 | 12OLGMA125 | 17.5OHGMA20 | |
3.6OEGMA160 | 12OEFMA63 | 15.5OEFMA6.3 | 17.5OHGMA25 |
Contact Cooper Bussmann or Bolfmax for complete specifications on medium voltage fuses.