Emerson TRE Ex e Transformers Owner's Manual

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Primary and Secondary Fuse Recommendations for all Three Phase Transformers
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.
Primary
General Purpose Transformers
Secondary
General Purpose
Transformers
VA 208 240 480 600 208 240 380 480
3K
12 (20) 9 (17.5) 5 (9) 4 (7) 12 9 6 5
6K
25 (40) 20 (35) 9 (15) 8 (12) 25 20 12 9
9K
35 (60) 30 (50) 15 (25) 12 (20) 35 30 18 15
15K
60 (100) 50 (90) 25 (45) 20 (35) 60 50 30 25
30K
110
(200)
100
(175)
50 (90) 40 (70) 110 100 60 50
45K
175
(300)
150
(250)
70
(125)
60
(100)
175 150 90 70
75K
300
(500)
250
(450)
125
(225)
100
(175)
300 250 150 125
112.5K
400
(750)
350
(650)
175
(300)
150
(250)
400 350 225 175
150K
600
(1000)
500
(900)
250
(450)
200
(350)
600 500 3900 250
225K
-- --
350
(650)
300
(500)
800 700 450 350
300K
-- --
500
(900)
400
(700)
1200 1000 600 500
500K
-- --
800
(1500)
650
(1200)
1800 1600 1000 800
Primary Drive Isolation Transformers
Secondary
Drive Isolation
Transformers
VA 230 460 575 230 460
7.5K
25 (45) 12 (20) 10 (17.5) 25 12
11K
35 (60) 17.5 (30) 15 (25) 35 17.5
14K
45 (85) 25 (40) 20 (35) 45 25
20K
70 (125) 35 (60) 30 (50) 70 35
27K
85 (150) 45 (80) 35 (60) 90 45
34K
110 (200) 60 (100) 45 (80) 110 60
40K
150 (250) 70 (125) 60 (100) 150 70
51K
175 (300) 80 (150) 70 (150) 175 80
63K
200 (350) 100 (175) 80 (150) 200 100
75K
250 (450) 125 (225) 100 (175) 250 125
93K
300 (500) 150 (250) 125 (225) 300 150
118K
400 (700) 200 (350) 150 (250) 400 200
145K
500 (800) 250 (450) 200 (350) 500 250
175K
-- 300 (500) 225 (400) 600 300
220K
-- 350 (650) 300 (500) 700 350
275K
-- 450 (850) 350 (600) 900 450
330K
-- 600 (1000) 450 (800) 1200 600
440K
-- 700 (1350) 600 (1000) 1400 700