Submittal Sheet

AT120A-E; AT140A-E; AT150A,B,D-F; AT160B; AT175A-D,F TRANSFORMERS
68-0054—06 2
SPECIFICATIONS
IMPORTANT
The specifications given in this publication do not
include normal manufacturing tolerances. Therefore,
a sample unit may not match the listed specifica-
tions exactly. Also, this product is built and tested
under closely controlled conditions, and some minor
differences in performance can be expected if those
conditions are changed.
Models: AT120A-E; AT140A-E; AT150A,B,D-F; AT160B;
AT175A-D,F.
Electrical Ratings: See Table 1.
a
Refer to regulation curves.
b
Voltage is 27.0V on AT150F and AT175F models.
Wiring Connections:
“A”, “C”, and “D” models: Primary—9 inch (230 mm) leadwires;
Secondary—screw terminals.
“B” and “E” models: Primary—9 inch (230 mm) leadwires or
fixed 1/4 inch (6 mm) quick-connects. Different length
leadwires and leadwires with stripped ends or with termi-
nals attached also available. Specify when ordering.
Secondary—9 inch (230 mm) leadwires or fixed 1/4 inch (6
mm) quick-connects. Different length leadwires, leadwires
with stripped ends or with terminals attached, and screw
terminals also available. Specify when ordering.
“F” models: Primary and Secondary—9 inch (230 mm) lead-
wires.
Mounting Means:
Dimensions: See Fig. 1 through 5.
Regulation:
See transformer regulation curves, Fig. 6 through 10.
Overcurrent Protection:
Inherent on AT120, AT140, and AT150. Thermal fusible link on
AT160 and AT175. Circuit breaker on AT150F and AT175F
models.
Approvals:
UNDERWRITERS LABORATORIES INC. LISTED (“A”, “C” and “F”
models): File No. E14881, Guide No. XOKV.
UNDERWRITERS LABORATORIES INC. COMPONENT RECOG-
NIZED (“B,” “D,” “E” models): File No. E14881, Guide No.
XOKV2.
All models conform to Underwriters Laboratories Inc. Stan-
dard UL 1585.
NATIONAL ELECTRICAL CODE: Class 2 not wet, Class 3 wet.
Optional Specifications:
End bells or caps on “B” through “E” models.
Terminations on “B” through “E” models.
Circuit breaker reset button on “F” models.
National Electrical Code:
Class 2 not wet, Class 3 wet
Table 1. Electrical Ratings.
Model
Number
Output Rating at
100 Percent Power
Factor
a
Primary Input Voltage
(60 Hz)
Secondary Output Voltage
Open Circuit At Rated Power Output
AT120 20 VA 120, 240, 277, 480, 120/240,
208/240, 240/277, 277/480,
120/208/240, 208/240/480,
or 208/277/480V
27.0 24.0
AT140 40 VA
AT150 50 VA
27.5
b
AT160 60 VA
AT175 75 VA
Model Suffix
Letter Mounting Means
A Includes clamp for outlet box knockout, 4 x 4 inch mounting plate for 2 x 4 inch or 4 x 4 inch outlet box, and
mounting feet for surface mount.
B Foot-mounted.
C Includes clamp for outlet box knockout.
D Integral 4 x 4 inch mounting plate fits 2 x 4 inch or 4 x 4 inch outlet box.
E Panel mounted with two No. 8 screws (not included).
F Includes 1/2-14 NPSM conduit connector and lock nut for mounting on plate or panel (not included) with 7/8 in.
knockout, and mounting feet for surface mount.