Transformers PCB Mount, Short Circuit Proof, VB & PT Series
230Va.c. 50 to 60Hz primary
Single or twin secondary windings for series or parallel connection (For conformance reasons,0.35 to 3.2VA transformers with 2 x 15 and 2 x 18V outputs and all transformers with 2x 24V outputs should not have their secondaries connected in series as this means they will not meet the VDE 0550 approval)
VB series (0.35 - 3.2VA) are inherently short circuit proof
PT series (4.5 - 22VA) are protected by internal PTC device
Compact design
Vacuum epoxy resin moulded to UL94-V0 rating
Double section glass fibre reinforced polyamide bobbins
100% electrical and flash tested
High efficiency and low temperature rise
Low inter-winding capacitance
Low radiated noise
Extra fixing holes for secure boarding mounting on 4.5VA and above
Selection Guide (Dual secondary)
VA Rating
Fixing centres (mm)
Pin configuration (mm)
C1
C2
P1
S1
S2
A
Pin Size
0.35
-
-
15
5
5
15
0.6 Ø
0.5
-
-
15
5
5
15
0.6 Ø
1.0
-
-
20
10
5
20
0.8 Ø
1.5
-
-
20
10
5
20
0.8 Ø
2.3
-
-
20
10
5
20
0.8 Ø
3.2
-
-
20
10
5
25
0.8 Ø
4.5
35
28
25
15
5
25
0.8 Ø
7.5
40
32
25
15
5
27.5
0.8 Ø
13
47.5
37.5
30
20
5
30
0.8 Ø
22
52.5
40
30
10
10
32.5
0.8 Ø
Isolation
Primary to Secondary 5kV
Secondary to Secondary 250V
Protection
Class 2
Insulation:
VB Series
PT Series
Class B (130°C) Class A (105°C)
Class E (120°C) Class A (105°C)
Fixing: mechanical fixings can be supplemented on the 4.5 to 22VA transformers by 4 self tapping crews (No-4 x 9.5mm max) using holes mounted in the corners of the case.
Max Ambient Temperature
0.35 to 2.3VA +70°C, 3.2VA +50°C, 4.5 to 22VA +40°C
Selection Guide (Single secondary)
VA Rating
Pin configuration (mm)
P1
S1
A
Pin Size
0.35
15
5
15
0.6 Ø
0.5
15
5
15
0.6 Ø
1.0
20
10
20
0.6 Ø
1.2
20
10
20
0.8 Ø
1.5
20
...
