O. 277 Volt Primary Single Phase Isolation Transformers
TEMCo Single Phase Isolation Transformers are 50/60 Hz rated and come in a NEMA 3R enclosure for indoor use as well as outdoor protection against rain and sleet. Our transformers are built to last, guaranteed. That's why we back these with a decade long warranty.
• UL Listed, CSA Approved
• Aluminum or Copper windings
• 50/60 Hz rated
• NEMA 3R Enclosure (for indoor or outdoor use)
Looking for a different specification? See all the primary voltage configurations here.
Select a Different Primary Configuration »
Secondary Voltages Selection | |
1. 600 | 15. 277 |
2. 575 | 16. 240 |
3. 550 | 17. 120/240 |
4. 480 | 18. 230 |
5. 240/480 | 19. 115/230 |
6. 460 | 20. 220 |
7. 230/460 | 21. 110/220 |
8. 440 | 22. 208 |
9. 220/440 | 23. 200 |
10. 416 | 24. 190 |
11. 208/416 | 25. 120 |
12. 400 | 26. 115 |
13. 380 | 27. 110 |
14. 347 | 28. 100 |
1. 277V Primary - 600 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 5 | - | T32792 |
5 | 8.33 | - | T32793 |
7.5 | 12.5 | - | T32794 |
10 | 16.67 | T21819 | T32795 |
15 | 25 | T21820 | T32796 |
25 | 41.67 | T21821 | T32797 |
37.5 | 62.5 | T21822 | T32798 |
50 | 83.33 | T21823 | T32799 |
75 | 125 | T21824 | T32800 |
100 | 166.67 | T21825 | T32801 |
167 | 278.33 | T21826 | T32802 |
200 | 333.33 | T21827 | T32803 |
250 | 416.67 | T21828 | T32804 |
330 | 550 | T21829 | T32805 |
2. 277V Primary - 575 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 5.22 | - | T32806 |
5 | 8.70 | - | T32807 |
7.5 | 13.04 | - | T32808 |
10 | 17.39 | T21833 | T32809 |
15 | 26.09 | T21834 | T32810 |
25 | 43.48 | T21835 | T32811 |
37.5 | 65.22 | T21836 | T32812 |
50 | 86.96 | T21837 | T32813 |
75 | 130.43 | T21838 | T32814 |
100 | 173.91 | T21839 | T32815 |
167 | 290.43 | T21840 | T32816 |
200 | 347.83 | T21841 | T32817 |
250 | 434.78 | T21842 | T32818 |
330 | 573.91 | T21843 | T32819 |
3. 277V Primary - 550 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 5.45 | - | T32820 |
5 | 9.09 | - | T32821 |
7.5 | 13.64 | - | T32822 |
10 | 18.18 | T21847 | T32823 |
15 | 27.27 | T21848 | T32824 |
25 | 45.45 | T21849 | T32825 |
37.5 | 68.18 | T21850 | T32826 |
50 | 90.91 | T21851 | T32827 |
75 | 136.36 | T21852 | T32828 |
100 | 181.82 | T21853 | T32829 |
167 | 303.64 | T21854 | T32830 |
200 | 363.64 | T21855 | T32831 |
250 | 454.55 | T21856 | T32832 |
330 | 600 | T21857 | T32833 |
4. 277V Primary - 480 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 6.25 | - | T32834 |
5 | 10.42 | - | T32835 |
7.5 | 15.63 | - | T32836 |
10 | 20.83 | T21861 | T32837 |
15 | 31.25 | T21862 | T32838 |
25 | 52.08 | T21863 | T32839 |
37.5 | 78.13 | T21864 | T32840 |
50 | 104.17 | T21865 | T32841 |
75 | 156.25 | T21866 | T32842 |
100 | 208.33 | T21867 | T32843 |
167 | 347.92 | T21868 | T32844 |
200 | 416.67 | T21869 | T32845 |
250 | 520.83 | T21870 | T32846 |
330 | 687.50 | T21871 | T32847 |
5. 277V Primary - 240/480 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 12.5/6.25 | - | T32848 |
5 | 20.83/10.42 | - | T32849 |
7.5 | 31.25/15.63 | - | T32850 |
10 | 41.67/20.83 | T21875 | T32851 |
15 | 62.5/31.25 | T21876 | T32852 |
25 | 104.17/52.08 | T21877 | T32853 |
37.5 | 156.25/78.13 | T21878 | T32854 |
50 | 208.33/104.17 | T21879 | T32855 |
75 | 312.5/156.25 | T21880 | T32856 |
100 | 416.67/208.33 | T21881 | T32857 |
167 | 695.83/347.92 | T21882 | T32858 |
200 | 833.33/416.67 | T21883 | T32859 |
250 | 1041.67/520.83 | T21884 | T32860 |
330 | 1375/687.5 | T21885 | T32861 |
6. 277V Primary - 460 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 6.52 | - | T32862 |
5 | 10.87 | - | T32863 |
7.5 | 16.30 | - | T32864 |
10 | 21.74 | T21889 | T32865 |
15 | 32.61 | T21890 | T32866 |
25 | 54.35 | T21891 | T32867 |
37.5 | 81.52 | T21892 | T32868 |
50 | 108.70 | T21893 | T32869 |
75 | 163.04 | T21894 | T32870 |
100 | 217.39 | T21895 | T32871 |
167 | 363.04 | T21896 | T32872 |
200 | 434.78 | T21897 | T32873 |
250 | 543.48 | T21898 | T32874 |
330 | 717.39 | T21899 | T32875 |
7. 277V Primary - 230/460 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 13.04/6.52 | - | T32876 |
5 | 21.74/10.87 | - | T32877 |
7.5 | 32.61/16.3 | - | T32878 |
10 | 43.48/21.74 | T21903 | T32879 |
15 | 65.22/32.61 | T21904 | T32880 |
25 | 108.7/54.35 | T21905 | T32881 |
37.5 | 163.04/81.52 | T21906 | T32882 |
50 | 217.39/108.7 | T21907 | T32883 |
75 | 326.09/163.04 | T21908 | T32884 |
100 | 434.78/217.39 | T21909 | T32885 |
167 | 726.09/363.04 | T21910 | T32886 |
200 | 869.57/434.78 | T21911 | T32887 |
250 | 1086.96/543.48 | T21912 | T32888 |
330 | 1434.78/717.39 | T21913 | T32889 |
8. 277V Primary - 440 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 6.82 | - | T32890 |
5 | 11.36 | - | T32891 |
7.5 | 17.05 | - | T32892 |
10 | 22.73 | T21917 | T32893 |
15 | 34.09 | T21918 | T32894 |
25 | 56.82 | T21919 | T32895 |
37.5 | 85.23 | T21920 | T32896 |
50 | 113.64 | T21921 | T32897 |
75 | 170.45 | T21922 | T32898 |
100 | 227.27 | T21923 | T32899 |
167 | 379.55 | T21924 | T32900 |
200 | 454.55 | T21925 | T32901 |
250 | 568.18 | T21926 | T32902 |
330 | 750 | T21927 | T32903 |
9. 277V Primary - 220/440 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 13.64/6.82 | - | T32904 |
5 | 22.73/11.36 | - | T32905 |
7.5 | 34.09/17.05 | - | T32906 |
10 | 45.45/22.73 | T21931 | T32907 |
15 | 68.18/34.09 | T21932 | T32908 |
25 | 113.64/56.82 | T21933 | T32909 |
37.5 | 170.45/85.23 | T21934 | T32910 |
50 | 227.27/113.64 | T21935 | T32911 |
75 | 340.91/170.45 | T21936 | T32912 |
100 | 454.55/227.27 | T21937 | T32913 |
167 | 759.09/379.55 | T21938 | T32914 |
200 | 909.09/454.55 | T21939 | T32915 |
250 | 1136.36/568.18 | T21940 | T32916 |
330 | 1500/750 | T21941 | T32917 |
10. 277V Primary - 416 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 7.21 | - | T32918 |
5 | 12.02 | - | T32919 |
7.5 | 18.03 | - | T32920 |
10 | 24.04 | T21945 | T32921 |
15 | 36.06 | T21946 | T32922 |
25 | 60.10 | T21947 | T32923 |
37.5 | 90.14 | T21948 | T32924 |
50 | 120.19 | T21949 | T32925 |
75 | 180.29 | T21950 | T32926 |
100 | 240.38 | T21951 | T32927 |
167 | 401.44 | T21952 | T32928 |
200 | 480.77 | T21953 | T32929 |
250 | 600.96 | T21954 | T32930 |
330 | 793.27 | T21955 | T32931 |
11. 277V Primary - 208/416 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 14.42/7.21 | - | T32932 |
5 | 24.04/12.02 | - | T32933 |
7.5 | 36.06/18.03 | - | T32934 |
10 | 48.08/24.04 | T21959 | T32935 |
15 | 72.12/36.06 | T21960 | T32936 |
25 | 120.19/60.1 | T21961 | T32937 |
37.5 | 180.29/90.14 | T21962 | T32938 |
50 | 240.38/120.19 | T21963 | T32939 |
75 | 360.58/180.29 | T21964 | T32940 |
100 | 480.77/240.38 | T21965 | T32941 |
167 | 802.88/401.44 | T21966 | T32942 |
200 | 961.54/480.77 | T21967 | T32943 |
250 | 1201.92/600.96 | T21968 | T32944 |
330 | 1586.54/793.27 | T21969 | T32945 |
12. 277V Primary - 400 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 7.5 | - | T32946 |
5 | 12.5 | - | T32947 |
7.5 | 18.75 | - | T32948 |
10 | 25 | T21973 | T32949 |
15 | 37.5 | T21974 | T32950 |
25 | 62.5 | T21975 | T32951 |
37.5 | 93.75 | T21976 | T32952 |
50 | 125 | T21977 | T32953 |
75 | 187.5 | T21978 | T32954 |
100 | 250 | T21979 | T32955 |
167 | 417.5 | T21980 | T32956 |
200 | 500 | T21981 | T32957 |
250 | 625 | T21982 | T32958 |
330 | 825 | T21983 | T32959 |
13. 277V Primary - 380 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 7.89 | - | T32960 |
5 | 13.16 | - | T32961 |
7.5 | 19.74 | - | T32962 |
10 | 26.32 | T21987 | T32963 |
15 | 39.47 | T21988 | T32964 |
25 | 65.79 | T21989 | T32965 |
37.5 | 98.68 | T21990 | T32966 |
50 | 131.58 | T21991 | T32967 |
75 | 197.37 | T21992 | T32968 |
100 | 263.16 | T21993 | T32969 |
167 | 439.47 | T21994 | T32970 |
200 | 526.32 | T21995 | T32971 |
250 | 657.89 | T21996 | T32972 |
330 | 868.42 | T21997 | T32973 |
14. 277V Primary - 347 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 8.65 | - | T32974 |
5 | 14.41 | - | T32975 |
7.5 | 21.61 | - | T32976 |
10 | 28.82 | T22001 | T32977 |
15 | 43.23 | T22002 | T32978 |
25 | 72.05 | T22003 | T32979 |
37.5 | 108.07 | T22004 | T32980 |
50 | 144.09 | T22005 | T32981 |
75 | 216.14 | T22006 | T32982 |
100 | 288.18 | T22007 | T32983 |
167 | 481.27 | T22008 | T32984 |
200 | 576.37 | T22009 | T32985 |
250 | 720.46 | T22010 | T32986 |
330 | 951.01 | T22011 | T32987 |
15. 277V Primary - 277 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 10.83 | - | T32988 |
5 | 18.05 | - | T32989 |
7.5 | 27.08 | - | T32990 |
10 | 36.10 | T22015 | T32991 |
15 | 54.15 | T22016 | T32992 |
25 | 90.25 | T22017 | T32993 |
37.5 | 135.38 | T22018 | T32994 |
50 | 180.51 | T22019 | T32995 |
75 | 270.76 | T22020 | T32996 |
100 | 361.01 | T22021 | T32997 |
167 | 602.89 | T22022 | T32998 |
200 | 722.02 | T22023 | T32999 |
250 | 902.53 | T22024 | T33000 |
330 | 1191.34 | T22025 | T33001 |
16. 277V Primary - 240 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 12.5 | - | T33002 |
5 | 20.83 | - | T33003 |
7.5 | 31.25 | - | T33004 |
10 | 41.67 | T22029 | T33005 |
15 | 62.5 | T22030 | T33006 |
25 | 104.17 | T22031 | T33007 |
37.5 | 156.25 | T22032 | T33008 |
50 | 208.33 | T22033 | T33009 |
75 | 312.5 | T22034 | T33010 |
100 | 416.67 | T22035 | T33011 |
167 | 695.83 | T22036 | T33012 |
200 | 833.33 | T22037 | T33013 |
250 | 1041.67 | T22038 | T33014 |
330 | 1375 | T22039 | T33015 |
17. 277V Primary - 120/240 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 25/12.5 | - | T33016 |
5 | 41.67/20.83 | - | T33017 |
7.5 | 62.5/31.25 | - | T33018 |
10 | 83.33/41.67 | T22043 | T33019 |
15 | 125/62.5 | T22044 | T33020 |
25 | 208.33/104.17 | T22045 | T33021 |
37.5 | 312.5/156.25 | T22046 | T33022 |
50 | 416.67/208.33 | T22047 | T33023 |
75 | 625/312.5 | T22048 | T33024 |
100 | 833.33/416.67 | T22049 | T33025 |
167 | 1391.67/695.83 | T22050 | T33026 |
200 | 1666.67/833.33 | T22051 | T33027 |
250 | 2083.33/1041.67 | T22052 | T33028 |
330 | 2750/1375 | T22053 | T33029 |
18. 277V Primary - 230 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 13.04 | - | T33030 |
5 | 21.74 | - | T33031 |
7.5 | 32.61 | - | T33032 |
10 | 43.48 | T22057 | T33033 |
15 | 65.22 | T22058 | T33034 |
25 | 108.70 | T22059 | T33035 |
37.5 | 163.04 | T22060 | T33036 |
50 | 217.39 | T22061 | T33037 |
75 | 326.09 | T22062 | T33038 |
100 | 434.78 | T22063 | T33039 |
167 | 726.09 | T22064 | T33040 |
200 | 869.57 | T22065 | T33041 |
250 | 1086.96 | T22066 | T33042 |
330 | 1434.78 | T22067 | T33043 |
19. 277V Primary - 115/230 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 26.09/13.04 | - | T33044 |
5 | 43.48/21.74 | - | T33045 |
7.5 | 65.22/32.61 | - | T33046 |
10 | 86.96/43.48 | T22071 | T33047 |
15 | 130.43/65.22 | T22072 | T33048 |
25 | 217.39/108.7 | T22073 | T33049 |
37.5 | 326.09/163.04 | T22074 | T33050 |
50 | 434.78/217.39 | T22075 | T33051 |
75 | 652.17/326.09 | T22076 | T33052 |
100 | 869.57/434.78 | T22077 | T33053 |
167 | 1452.17/726.09 | T22078 | T33054 |
200 | 1739.13/869.57 | T22079 | T33055 |
250 | 2173.91/1086.96 | T22080 | T33056 |
330 | 2869.57/1434.78 | T22081 | T33057 |
20. 277V Primary - 220 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 13.64 | - | T33058 |
5 | 22.73 | - | T33059 |
7.5 | 34.09 | - | T33060 |
10 | 45.45 | T22085 | T33061 |
15 | 68.18 | T22086 | T33062 |
25 | 113.64 | T22087 | T33063 |
37.5 | 170.45 | T22088 | T33064 |
50 | 227.27 | T22089 | T33065 |
75 | 340.91 | T22090 | T33066 |
100 | 454.55 | T22091 | T33067 |
167 | 759.09 | T22092 | T33068 |
200 | 909.09 | T22093 | T33069 |
250 | 1136.36 | T22094 | T33070 |
330 | 1500 | T22095 | T33071 |
21. 277V Primary - 110/220 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 27.27/13.64 | - | T33072 |
5 | 45.45/22.73 | - | T33073 |
7.5 | 68.18/34.09 | - | T33074 |
10 | 90.91/45.45 | T22099 | T33075 |
15 | 136.36/68.18 | T22100 | T33076 |
25 | 227.27/113.64 | T22101 | T33077 |
37.5 | 340.91/170.45 | T22102 | T33078 |
50 | 454.55/227.27 | T22103 | T33079 |
75 | 681.82/340.91 | T22104 | T33080 |
100 | 909.09/454.55 | T22105 | T33081 |
167 | 1518.18/759.09 | T22106 | T33082 |
200 | 1818.18/909.09 | T22107 | T33083 |
250 | 2272.73/1136.36 | T22108 | T33084 |
330 | 3000/1500 | T22109 | T33085 |
22. 277V Primary - 208 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 14.42 | - | T33086 |
5 | 24.04 | - | T33087 |
7.5 | 36.06 | - | T33088 |
10 | 48.08 | T22113 | T33089 |
15 | 72.12 | T22114 | T33090 |
25 | 120.19 | T22115 | T33091 |
37.5 | 180.29 | T22116 | T33092 |
50 | 240.38 | T22117 | T33093 |
75 | 360.58 | T22118 | T33094 |
100 | 480.77 | T22119 | T33095 |
167 | 802.88 | T22120 | T33096 |
200 | 961.54 | T22121 | T33097 |
250 | 1201.92 | T22122 | T33098 |
330 | 1586.54 | T22123 | T33099 |
23. 277V Primary - 200 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 15 | - | T33100 |
5 | 25 | - | T33101 |
7.5 | 37.5 | - | T33102 |
10 | 50 | T22127 | T33103 |
15 | 75 | T22128 | T33104 |
25 | 125 | T22129 | T33105 |
37.5 | 187.5 | T22130 | T33106 |
50 | 250 | T22131 | T33107 |
75 | 375 | T22132 | T33108 |
100 | 500 | T22133 | T33109 |
167 | 835 | T22134 | T33110 |
200 | 1000 | T22135 | T33111 |
250 | 1250 | T22136 | T33112 |
330 | 1650 | T22137 | T33113 |
24. 277V Primary - 190 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 15.79 | - | T33114 |
5 | 26.32 | - | T33115 |
7.5 | 39.47 | - | T33116 |
10 | 52.63 | T22141 | T33117 |
15 | 78.95 | T22142 | T33118 |
25 | 131.58 | T22143 | T33119 |
37.5 | 197.37 | T22144 | T33120 |
50 | 263.16 | T22145 | T33121 |
75 | 394.74 | T22146 | T33122 |
100 | 526.32 | T22147 | T33123 |
167 | 878.95 | T22148 | T33124 |
200 | 1052.63 | T22149 | T33125 |
250 | 1315.79 | T22150 | T33126 |
330 | 1736.84 | T22151 | T33127 |
25. 277V Primary - 120 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 25 | - | T33128 |
5 | 41.67 | - | T33129 |
7.5 | 62.5 | - | T33130 |
10 | 83.33 | T22155 | T33131 |
15 | 125 | T22156 | T33132 |
25 | 208.33 | T22157 | T33133 |
37.5 | 312.5 | T22158 | T33134 |
50 | 416.67 | T22159 | T33135 |
75 | 625 | T22160 | T33136 |
100 | 833.33 | T22161 | T33137 |
167 | 1391.67 | T22162 | T33138 |
200 | 1666.67 | T22163 | T33139 |
250 | 2083.33 | T22164 | T33140 |
330 | 2750 | T22165 | T33141 |
26. 277V Primary - 115 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 26.09 | - | T33142 |
5 | 43.48 | - | T33143 |
7.5 | 65.22 | - | T33144 |
10 | 86.96 | T22169 | T33145 |
15 | 130.43 | T22170 | T33146 |
25 | 217.39 | T22171 | T33147 |
37.5 | 326.09 | T22172 | T33148 |
50 | 434.78 | T22173 | T33149 |
75 | 652.17 | T22174 | T33150 |
100 | 869.57 | T22175 | T33151 |
167 | 1452.17 | T22176 | T33152 |
200 | 1739.13 | T22177 | T33153 |
250 | 2173.91 | T22178 | T33154 |
330 | 2869.57 | T22179 | T33155 |
27. 277V Primary - 110 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 27.27 | - | T33156 |
5 | 45.45 | - | T33157 |
7.5 | 68.18 | - | T33158 |
10 | 90.91 | T22183 | T33159 |
15 | 136.36 | T22184 | T33160 |
25 | 227.27 | T22185 | T33161 |
37.5 | 340.91 | T22186 | T33162 |
50 | 454.55 | T22187 | T33163 |
75 | 681.82 | T22188 | T33164 |
100 | 909.09 | T22189 | T33165 |
167 | 1518.18 | T22190 | T33166 |
200 | 1818.18 | T22191 | T33167 |
250 | 2272.73 | T22192 | T33168 |
330 | 3000 | T22193 | T33169 |
28. 277V Primary - 100 Secondary
kVA | Output Amps | Aluminum | Copper |
3 | 30 | - | T33170 |
5 | 50 | - | T33171 |
7.5 | 75 | - | T33172 |
10 | 100 | T22197 | T33173 |
15 | 150 | T22198 | T33174 |
25 | 250 | T22199 | T33175 |
37.5 | 375 | T22200 | T33176 |
50 | 500 | T22201 | T33177 |
75 | 750 | T22202 | T33178 |
100 | 1000 | T22203 | T33179 |
167 | 1670 | T22204 | T33180 |
200 | 2000 | T22205 | T33181 |
250 | 2500 | T22206 | T33182 |
330 | 3300 | T22207 | T33183 |