Honeywell AT140 Catalog Page
Transformers
3-1/16 (78)
1-3/4
(44)
2 (51)
1-1/16
(27)
PLATE MOUNTED AT THE
LAMINATIONS (3/4 ABOVE
PLATE MOUNTING)
MOUNTING PLATE
2-1/4
(57)
2-3/8
(60)
3-7/32
82
FOOT MOUNTED
D
2-15/16 (76)
PLATE OR OUTLET BOX
MOUNTED AT CLAMP
ON END BELL (ALL
ABOVE PLATE MOUNTING)
M17509A
2-3/8
(60)
1/4
(6)
3-3/8 (86)
3-3/8
(86)
4-3/16
(106)
2
(51)
3 -1/4 (83)
5/16 (8)
1/8 (3)
1/8
(3)
Dimensions, Approximate Electrical Ratings
Product Number
AT150A1007/U 1 11/16 in. high x
3 3/16 in. wide x
1 3/4 in. deep
AT150B1146/U 1 11/16 in. high x
3 1/2 in. wide x
1 3/4 in. deep
AT150B1252/U 1 11/16 in. high x
3 1/2 in. wide x
1 3/4 in. deep
AT175A1008/U 3 3/16 in. high x
2 3/8 in. wide x
3 5/8 deep
Dimensions in inches (millimeters)
43 mm high x
81 mm wide x
75 mm deep
43 mm high x
89 mm wide x
75 mm deep
43 mm high x
89 mm wide x
75 mm deep
81 mm high x
60 mm wide x
92 mm deep
(Primary
Vo lt ag e)
120 Vac,
208 Vac,
(Secondary
Voltage) (Output)
27.5 V.O.C. 24 Vac at
50 VA
240 Vac
120 Vac,
208 Vac,
240 Vac
— 24 Vac at
50 VA
277 Vac 27.5 V.O.C. 24 Vac at
50 VA
120 Vac,
208 Vac,
240 Vac
27.5 V.O.C. 24 Vac at
75 VA
Mounting
Foot mounted, plate mounted on 2x4 in.
or 4x4 in. outlet box, clamp mounted
using outlet box knockout, or panel
mounted
Rating Includes(inch) (mm)
No Metal end
bells
Foot-mounted No —
Foot-mounted No Plastic
end caps
NEMA
Foot mounted, plate mounted on 2x4 in.
or 4x4 in. outlet box, clamp mounted
using outlet box knockout, or panel
NEMA
type E
Metal end
bells
mounted
Combustion Controls
Residential
AT140 General Purpose Transformer for Hydronic Heating Controls
Temperature Rating: -20 F to +105 F (-29 C to +41 C)
Frequency: 60 Hz
Electrical Connections (main):
Primary: 9 in. leadwires (229 mm leadwires)
Secondary: (2) screw terminals
Product Number
AT140A1034/U 3 3/16 in. high x
Dimensions, Approximate Electrical Ratings
2 3/8 in. wide x
3 1/8 in. deep
81 mm high x
60 mm wide x
79 mm deep
(Primary
Voltag e)
120 Vac 27 V.O.C. 24 Vac at
Provide power to 24 Vac circuits in heating/cooling control
systems. Intended for use in systems with predictable, uniform
loads. Can be used in any application that does not exceed the
listed ratings.
• Color-coded leadwires for primary connections and screw terminals
for secondary connections, fixed 1/4 inch (6 mm) male quickconnects or color-coded leadwires for both primary and secondary,
are standard.
• Meet NEC Class 2 requirements.
• Meet Underwriters Laboratories Inc. Standard UL 1585 and are
identified. Class 2 not wet, Class 3 wet.
Approvals
Canadian Standards Association: CSA Certified: A & B models.
Underwriters Laboratories, Inc: UL Listed: A,C,F models. File #
E14881
(Secondary
Voltage) (Output)
20 VA
Mounting(inch) (mm)
Foot mounted, plate mounted on 2x4 in. or 4x4 in. outlet box,
clamp mounted using outlet box knockout, or panel mounted
70-6910 159
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