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Rating
Class F
Losses
C
Losses
W
Frame
size
Rating
Class E
Losses
C
Losses
W
Frame
size
Rating
Class A
Losses
C
Losses
W
Frame
size
Rating
Ex d
& IP65
Losses
C
Losses
W
Frame
size
30VA
5W
8W
SE 25
25VA
5W
6W
SE 25
20VA
4W
4W
SE 25
20VA
0.6W
4W
SE 25
60VA
6W
12W
SE 50
50VA
6W
8W
SE 50
40VA
5W
5W
SE 50
40VA
0.8W
5W
SE 50
120VA
7W
23W
SE 100
100VA
7W
15W
SE 100
80VA
6W
8W
SE 100
80VA
1.0W
8W
SE 100
180VA
10W
30W
SE 150
150VA
10W
20W
SE 150
125VA
8W
12W
SE 150
125VA
1.5W
12W
SE 150
225VA
13W
35W
SE 200
200VA
13W
25W
SE 200
150VA
10W
13W
SE 200
150VA
2.0W
13W
SE 200
280VA
18W
40W
SE 250
250VA
18W
30W
SE 250
200VA
13W
18W
SE 250
200VA
3.2W
18W
SE 250
300VA
24W
56W
SE 250
300VA
24W
40W
SE 300
250VA
18W
21W
SE 300
250VA
4.0W
21W
SE 300
400VA
26W
60W
SE 300
400VA
26W
45W
SE 400
300VA
21W
30W
SE 400
300VA
5.0W
30W
SE 400
500VA
28W
67W
SE 400
500VA
28W
52W
SE 500
400VA
23W
38W
SE 500
400VA
6.0W
38W
SE 500
600VA
32W
85W
SE 500
600VA
32W
68W
SE 600
500VA
25W
45W
SE 600
500VA
6.0W
45W
SE 600
700VA
35W
95W
SE 600
750VA
35W
74W
SE 750
600VA
28W
56W
SE 750
600VA
6.5W
56W
SE 750
1.0KVA
38W
110W
SE 750
1.0KVA
38W
90W
SE 1000
750VA
31W
65W
SE 1000
750VA
6.0W
65W
SE 1000
1.5KVA
53W
155W
SE 1000
1.5KVA
53W
120W
SE 1500
1.25KVA
45W
90W
SE 1500
1.0KVA
11W
90W
SE 1500
2.0KVA
62W
180W
SE 1500
2.0KVA
62W
150W
SE 2000
1.5KVA
55W
100W
SE 2000 1.25KVA
13W
100W
SE 2000
2.5KVA
77W
205W
SE 2000
2.5KVA
77W
170W
SE 2500
2.0KVA
63W
110W
SE 2500
1.5KVA
15W
110W
SE 2500
3.0KVA
103W
250W
SE 2500
3.0KVA
103W
190W
SE 3000
2.5KVA
85W
140W
SE 3000
2.0KVA
21W
140W
SE 3000
4.0KVA
116W
280W
SE 3000
4.0KVA
116W
220W
SE 4000
3.0KVA
95W
165W
SE 4000
2.5KVA
24W
165W
SE 4000
5.0KVA
160W
360W
SE 4000
5.0KVA
160W
305W
SE 5000
4.0KVA
125W
190W
SE 5000
3.0KVA
33W
190W
SE 5000
6.25KVA
200W
430W
SE 5000 6.25KVA
200W
320W
SE 6250
5.0KVA
160W
230W
SE 6250
4.0KVA
42W
230W
SE 6250
7.5KVA
248W
490W
SE 6250
7.5KVA
248W
360W
SE 7500
6.25KVA
200W
280W
SE 7500
5.0KVA
51W
280W
SE 7500
The heat loss data shown is important when transformers are fully enclosed or housed in confined control panel situations.
The data shown is provided to help design engineers select the correct transformer type and insulation type.
Non standard Class A insulation (105 deg C) transformers are for lower watts loss per VA. Class A designs are suitable for UL
requirements utilising all approved UL registered and approved materials.
To allow transformers to be enclosed in Ex or IP65 rated cabinets high grade core materials can be used and core sizes adapted
to achieve lower temperature rises. Selection of enclosure must be based on the heat loss data provided.
Heat loss data for Ex or IP65 enclosed transformers
Losses for Class F (155 deg C) transformers
Losses for Class E (120 deg C) transformers
Losses for Class A (105 deg C) transformers
with frame size data
Losses for Ex or IP65 enclosed transformers
with frame size data
TRANSFORMERS FOR Ex & IP65 ENCLOSURES
& HEAT LOSS DATA FOR SINGLE PHASE TRANSFORMERS IN CLASSES F, E & A
Definitions and data
High efficiency types for Ex & IP65 enclosure (Ex, IP65 ) For guidance only, for specific applications contact our sales department
C– Core losses are at nominal input voltage
W– Winding losses (approximate) are at full load
Insulation class
Coding
Temperature
rating
Maximum
temperature rise
Maximum ambient
temperature
Class F
SF
155 deg C
115 deg C
35 deg C
Class E
SE
120 deg C
85 deg C
35 deg C
Class A
SA
105 deg C
70 deg C
35 deg C
Ex d enclosed transformer
Eastern Transformers and Equipment Ltd , Unit H1 Overland Business Park, Great Welnetham, Bury St Edmunds
Suffolk , England IP30 0UL. Tel 0044 (0) 1284 388033. Fax 386969. Web www.ete.co.uk . Email info@ete.co.uk
