Technical Notes
Frequently Asked Transformer Questions
Primary and Secondary Fuse Recommendations for all Three Phase Transformers
9
yramirP
AV 802 042 084 006 802 042 083 084
0003
0006
0009
00051
00003
00054
00057
)02(21)5.71(9)9(5)7(421 965
)04(52)53(02)51(9)21(85202219
)06(53)05(03)52(51)02(2153038151
)001(06)09(05)54(52)53(0206050352
)002(011)571(001)09(05)07(040110010605
)003(571)052(051)521(07)001(065710510907
)005(003)054(052)522(521)571(001003052051521
005211
000051
000522
000003
000005
)057(004)056(053)003(571)052(051004053522571
)0001(006)009(005)054(052)053(0020060050093052
----)056(053)005(003008007054053
----)009(005)007(00400210001006005
----)0051(008)0021(056008100610001008
sremrofsnarTesopruPlareneG
yradnoceS
sremrofsnarTesopruPlareneG
AV 032 064 575 032 064
0057
00011
00041
00002
00072
00043
00004
00015
00036
00057
00039
000811
000541
yramirP
)54(52)02(21)5.71(015221
)06(53)03(5.71)52(51535.71
)58(54)04(52)53(025452
)521(07)06(53)05(030753
)051(58)08(54)06(530954
)002(011)001(06)08(5401106
)052(051)521(07)001(0605107
)003(571)051(08)051(0757108
)053(002)571(001)051(08002001
)054(052)522(521)571(001052521
)005(003)052(051)522(521003051
)007(004)053(002)052(051004002
)008(005)054(052)053(002005052
sremrofsnarTnoitalosIevirD
yradnoceS
noitalosIevirD
sremrofsnarT
000571
000022
000572
000033
000044
--)005(003)004(522006003
--)056(053)005(003007053
--)058(054)006(053009054
--)0001(006)008(0540021006
--)0531(007)0001(0060041007
Fuse = I*125% next size higher if primary current is 9 Amp or higher. No secondary fusing required.
(Fuse) = (I*250%) next size smaller if primary current is 9 Amps. or higher. Secondary fusing is required. See chart for size.
OUTPUT FUSE=1*125% next size higher if secondary current is 9 Amps or higher. Recommended fuse size per NEC450.3[B] and
commercially available fuse types.
Visit our website at www.solaheviduty.com or
contact Technical Services at (800) 377-4384 with any questions.
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