CLASS 2/3 TRANSFORMER
www.TriadMagnetics.com
Phone: (951) 277-0757
Fax: (951) 277-2757
460 Harley Knox Blvd.
Perris, CA 92571 Publish Date: December 4, 2013
FS28-420-C2
Description:
The FS28-420-C2 is a series/parallel primary and dual secondary, split bobbin
design which operates with either a parallel input of 115V or a series input of 230V.
The secondaries are 14V @ 0.42A each. They can be used independently (up to
300V difference between them) or in series for double the voltage or in parallel for
double the current. The split bobbin design eliminates the need for costly
electrostatic shielding.
Electrical Specifications (@25C)
1. Maximum Power: 12.0VA
2. Primary: Series: 230V; Para llel: 115V
3. Secondaries: 14.0V @ 0.42A each
4. Voltage Regulation: 25% TYP @ full load to no load
5. Temperature Rise: 25C TYP
6. Hipot tested 100% at 4200 VRMS pri to sec
7. Hipot teste d 100% at 2160 VRMS sec to sec
8. Recommended fuse (fuse on primary): For 115V - Cooper/Bussman, Type MDL,
rated 500mA, 250V. For 230V – Littlefuse, Type 313, rated 250mA, 250V
Construction:
Three flange bobbin construction with primaries and secondaries wound side by
side for low capac itive coupling. UL Class F Insulation System (155° C).
Agency File:
UL: File E65390, UL 5085-1 & 3 (1585), Class 2 not wet / Class 3 wet Transformer
cUL: File E65390, UL 5085-1 & 3 (1585) For Canadian Us e (CSA 22.2, No.66.3-06)
TUV Certificate No.: R72120839, EN61558, Safety Isolating xfmr, general use
Dimensions: Units in inches.
H W L A B C D E F
1.437 1.562 1.875 0.300 0.400 1.410 0.041 0.020 0.234
Weight : 0.70 lbs
Schematic:
RoHS Compliance: As of manufacturing date February 2005, all standard products meet
the req uirem ents of 2011/65/EU, known as the Ro HS init i at iv e .
Note: Order and shipping documentation may have a “-B” suffix; this indicates Bulk
packaging but does not show on the actual part number marked on the transformer.
* Upon printing, this document is considered “uncontrolled”. Please contact Triad Magnetics’
website for the most current version.
12 34
L
H
W
E
A
B
A
C
0.06" DIAMETER
HOLE
DF
1
58
4
Board Layout
5
PARALLEL
4
3
2
1 14V @ 0.42A
4
3
2
1
SERIES
115V
50/60Hz 6
7
8
1
2
3
4
14V @ 0.42A
230V
50/60Hz
