for product data sheets, visit www .cooperb ussmann.com/products/datasheet.asp 84 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 catalog numbers catalog numbers transformer transformer primary voltage kva 3.3kv 6.6kv 11kv/esi 12-8 ref. 13.8kv 200 3.6kv oefma 63 12kv oefma 31.5 12kv oefma 25/01 15.5kv oefma 16 250 3.6kv oefma 80 12kv oefma 40 12kv oefma 25/ 15.5kv oefma 20 300/315 3.6kv oefma 100 12kv oefma 50 12kv oefma31.5/02 15.5kv oefma 25 400 3.6kv oefma 125 12kv oefma 63 12kv oefma 40/ 15.5kv oefma 31.5 500 3.6kv oefma 160 12kv ohfma 71 12kv oefma 50/03 15.5kv oefma 40 630 3.6kv oefma 200 7.2kv oefma 100 12kv oefma 63/ 15.5kv oefma 50 750/800 3.6kv olgma 250 7.2kv ohgma 125 12kv ohfma 80/04 15.5kv oefma 63 1000 3.6kv olgma 250* 7.2kv ohgma 140 12kv ohgma 90**/05 15.5kv ohgma 71 1250 7.2kv ohgma 160* 12kv ohgma 100/ 15.5kv ohgma 90 1600 12kv olgma 125*/ 15.5kv 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 exces s of the transformer full load current. in this event, please consult cooper bussmann. catalog numbers basic cat. dimensional breaking number voltage ref. bs 2692 amp ratings capacity (ka) oefma 3.6kv fo1 6.3, 10, 16, 20, 25, 31.5, 40, 50, 63, 80, 100, 125, 160, 200 50 oegma 3.6kv fo2 100, 125, 160, 200 50 olgma 3.6kv fo2 250 50 oefma 7.2kv fo1 80, 100, 112 45 ohgma 7.2kv fo2 125, 140, 160 45 oefma 12.0kv fo1 6.3, 10, 16, 20, 25, 31.5, 40, 50, 63 40 ohfma 12.0kv fo1 71, 80 40 ohgma 12.0kv fo2 6.3, 10, 16, 20, 25, 31.5, 40, 50, 63, 71, 80, 90, 100 40 olgma 12.0kv fo2 125 40 oefma 15.5kv fo1 6.3, 10, 16, 20, 25, 31.5, 40, 50, 63 40 ohgma 15.5kv fo2 71, 80, 90 40 olgma 15.5kv fo2 100 40 ohgma 17.5kv fo2 6.3, 10, 16, 20, 25, 31.5, 40, 50, 63, 80 35 oegma 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 _ _ _ _ _ _ _ _ _ _ _ current-limiting fuse for use in oil switchgear fuse types: oef, oeg, ohf, ohg, olg 10 min ?16 max striker travel after operation, if fitted. 63.5 68 max 44 4 4 254mm (10 in) or 359mm (14 in) dimensions:
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