Medium Voltage Fuses British Standard IEC fuses for use in oil filled distribution switchgear OEFMA Code Number Reference 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. O _ M A 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) Dimensions: Featues and Benefits * Physically sized for replacement of British Standard fuse links 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 Typical Applications * Medium Voltage BS designed equipment Catalog Numbers Transformer kVA 200 250 300/315 400 500 630 750/800 1000 1250 1600 _ Type 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 31.5, 40, 50, 63 31.5, 40, 50, 63, 71, 80, 90, 100 31.5, 40, 50, 63 31.5, 40, 50, 63, 80 31.5, 40, 50 Breaking Capacity (kA) 50 50 50 45 45 40 40 40 40 40 40 40 35 25 Catalog Number Build-A-Code kV Basic Amps Catalog Number ___ _____ Contact Cooper Bussmann for complete specifications on medium voltage fuses. 84 For product Data Sheets, visit www.cooperbussmann.com/products/datasheet.asp ___