British Standard VT Fuse Links. A range of voltage transformer primary Fuse Links to BS9- and IEC-. Wide range of ratings from kv to kv. Amp industry standard current ratings. CAV range with ratings from.kv to kv. Bussmann Voltage and Auxiliary Transformer Fuse Links Bussmann manufacture a wide range of voltage transformer (VT) fuse links. In North America they are referred to as Potential Transformer fuses. These fuse links are designed for use in the primary side of voltage transformers to provide system isolation in the event of faults occurring in the transformer circuit. Voltage transformer fuse links, have a preferred current rating of A. Experience has shown that there is a risk of spurious operation by transient overcurrents where lower current ratings are used. In addition, in order to minimise the risk of deterioration of the fine fuse elements caused by corona, it is desirable to mount the fuse links so that the earthed metal is not in the immediate vicinity of the part of the barrel between the ferrules. Higher current and E ratings are available for special applications, including auxiliary transformers. A range of VT fuse links with a breaking capacity of 00kA for use at the output terminals of large turbo alternators can also be ordered. For further information, please contact Bussmann application engineers. Types prefixed A or N are suitable for use in Air only. Types prefixed O may be used under oil. For DIN dimensioned voltage transformer and auxiliary transformer fuse links, please refer to DIN dimensioned fuse link section.
Selection Table Voltage and Auxiliary Transformer Fuse Links Table of ratings for voltage transformer fuses. - kv Part Number Voltage Rating U n kv Current Rating I n A Breaking Capacity I ka Cold Resistance Ω Minimum Pre-Arcing Joule Intergral (I t) A s Maximum Total Clearing Length mm Diameter ø mm Weight kg.nbun*.nbun*.nbun*..... 0. 0.07 0.0.X0.X0.X0 9.X0 0. 0. 0..ABWN*.ABWN*.... 0. 0.0.X0.X0.ABCN*.ABCN*..ABCN*0.... 0 0. 0.0 0.0.X0.X0.X0 7.0X0 9 9 9 0. 0. 0. AMWNA0.E AMWNAE AMWNAE AMWNAE AMWNAE AMWNAE 0...0 0. 0. 0.X0 0.0X0 0.0X0 0.X0 7.9X0.X0 0.X0.X0.X0.0X0.X0 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. 0. ABWNA0.E ABWNAE ABWNAE ABWNAE ABWNAE 0....0 0.9 9 X0 0.0X0 0.X0 0.X0.X0 0.7X0 0.X0 0.0X0 7.ABWN* 7.ABWN*. 7. 7.. 0. 0..X0.0X0.X0 7.ABCN* 7.ABCN*. 7. 7.. 0. 0..X0.0X0.X0 9 9 0. 0. 7.OBCN* 7.OBCN*. 7. 7.. 0. 0..X0.0X0.X0 9 9 0. 0. 7.OBWN* 7.OBWN*. 7. 7.. 0. 0..X0.0X0.X0 ABCN* OBCN*.. 9 9 0. 0. ABFN* OBFN*...0X0.0X0 0. 0. 7.ABGN* 7.OBGN* 7. 7....0X0.0X0 9 9 0. 0. ABGN* OBGN*.00.00.0X0.0X0 9 9 0. 0. OBGN*..0.X0 7.7X0 9 0. A kv AGBN* A is also available for certain indoor applications. Please contact Bussmann s application engineers for further information. * The last letter of the ordering code on these items is normally either A or, please refer to how to order page for an explanation. Fuse Link type: TAG type A Ferrule and FUSE LINK TYPE A B D NBUN* ABWNA AMWNA OBWN* ABCN* OBCN* ABFN* OBFN* ABGN* OBGN* 9 9 9 9 7. 0. mm bolt with BSW thread Ferrule Fuse Link Tag type A shown in full lines and Tag shown in dotted lines 9
Time current characteristics for. to kv VT Fuse Links of,. and 0 Amp ratings RMS SYMMETICAL PROSPECTIVE CURRENT IN AMPERES PRE - ARCING TIME IN SECONDS 0A.A A* HOUR CURVES RELATE TO MEAN PRE-ARCING TIME WITH TOLERANCE + 0% ON CURRENT * Curve valid for all A ratings shown in the selection table. Curve valid for all.a ratings shown in the selection table.
Time current characteristics for E rated kv VT Fuse Links, fuse type ABWNA (minimum melting times) 00 0 0.E E 0 E E TIME IN SECONDS...... E E..0.0.0.0.0.0.0 0. 0 0 00 00 0 0 0 RMS SYMMETRICAL CURRENT IN AMPS
Time current characteristics for E rated kv VT Fuse Links, fuse type ABWNA (maximum melting times) 00 0 0.E E 0 E E TIME IN SECONDS...... E E..0.0.0.0.0.0.0 0. 0 0 00 00 0 0 0 RMS SYMMETRICAL CURRENT IN AMPS
Time current characteristics for E rated kv VT Fuse Links, fuse type AMWNA (minimum melting times) 00 0 0.E E 0 E E TIME IN SECONDS...... E..0.0.0.0.0.0.0 0. 0 0 00 00 0 0 0 RMS SYMMETRICAL CURRENT IN AMPS
Time current characteristics for E rated kv VT Fuse Links, fuse type AMWNA (maximum melting times) 00 0 0.E E 0 E E TIME IN SECONDS...... E..0.0.0.0.0.0.0 0. 0 0 00 00 0 0 0 RMS SYMMETRICAL CURRENT IN AMPS
Selection Table Voltage and Auxiliary Transformer Fuse Links Table of ratings for voltage transformer fuses,. - kv type CAV Part Number Voltage Rating U n kv Current Rating I n A Breaking Capacity I ka Cold resistance in free air at rated current Ω Minimum Pre-Arcing Joule Intergral (I t) A s Maximum Total Clearing Length mm Diameter ø mm Weight kg.cav..x0 0 0 CAVE 0. X0.X0 7 0. CAVH0.E CAVHE CAVHE 0... 0..X0.X0 9.0X0 9.0X0.X0 7 7 7 0. 0. 0. 7.CAV 7.CAV 7.CAV 7.CAV0 7. 7. 7. 7. 0 0.9 0. 0. 0..X0 0.0X0.X0.X0.7X0.X0.X0 0 0 0 0 CAV..X0 0 0 CAV0.E CAVE CAVE CAVE CAVE CAV7E 0. 7 7... 0.9 0.X0 0.0X0 0.X0 0.X0 0.0X0 7.X0.X0 0.X0 0.X0 0.X0.X0.X0 7 7 7 7 7 7 CAVH0.E CAVHE CAVHE 0... 7.X0.X0 9.0X0 9.0X0.X0 7 7 7 7.CAV 7.CAV 7.CAV 7.CAV0 7. 7. 7. 7. 0.9 0. 0..X0.X0.X0.X0.0X0 9.X0 0 0 0 0 CAV CAV CAV...X0 0.0X0.X0.7X0.X0.0.0.0 CAV CAV...X0 0.X0.X0.. CAVE..X0.X0. CAVH0.E CAVHE CAVHE 0....0.X0.X0 9.0X0 9.0X0.X0... These Voltage Transformer fuse links are available in the ratings shown in the table above. CAV fuse links are suitable for indoor use in air only. Type CAVH Fuse links are fitted with striker pins which may be used for indication purposes. Fuse Link type: CAV (Shown with striker fitted) FUSE LINK TYPE.CAV CAV CAVH 7.CAV CAV CAV CAVH 7.CAV CAV CAV CAV CAVH A 0 7 0 0 7 0 max 0mm travel after operation