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INSTALLATION INSTRUCTIONS

69-1641EF-01

AT20, AT40, AT72D, AT87, AT88

AT Transformers

APPLICATION

The AT20, AT40, AT72, AT87 and AT88 TRADELINE®

Transformers are step-down transformers used

primarily for powering 24 Vac control systems. They

can be used in any 24 Vac application that does not

exceed the transformer volt-ampere (VA) rating.

The TRADELINE® Transformers will replace all

equivalent Honeywell and competitive transformers

with similar primary voltage requirements, equal or

smaller VA ratings and similar mounting

configurations.

Transformer voltage ratings (primary and secondary),

wiring connection type, and fusing are listed in Table

1.

The transformers are Underwriters Laboratories Inc.

component recognized and Canadian Standards

Association listed and meet NEC Class 2 not wet,

Class 3 wet requirements as specified by NEMA

Standard DC-20.

SPECIFICATIONS

Models:

See Table 1.

Table 1. Transformer Model and Electrical Specifications.

a

Transformer complies with 24 volt NEMA Standard DC-20.

b

Available with female quick-connect terminals on all leadwires.

c

Thermal fuses in primary on 208V/240V models for overload protection.

Model

PrimarySecondaryOutput at

100 Percent

Power

Rating

Overload

Protection

Voltage and

Frequency

Wiring

ConnectionVoltage

Wiring

Connection

AT20

a

120 Vac, 50/60 HzTwo 9 in. (229 mm)

leadwires

24 VacTwo 9 in. (229 mm)

leadwires

20 VAEnergy

Limited

c

AT40

a

120 Vac, 50/60 Hz40 VA

240 Vac, 50/60 Hz

AT72D

a

120 Vac, 50/60 HzTwo screw

terminals

240 Vac, 50/60 HzThree 9 in. (229

mm) leadwires

AT87A

a

120 Vac, 50/60 HzTwo 13 in. (330

mm) leadwires

50 VA

208 Vac, 50/60 Hz

240 Vac, 50/60 Hz

AT88A120Vac, 50/60 HzTwo 12 in. (305

mm) leadwires

24 VacTwo 12 in. (305

mm) leadwires

75 VAFuse in

secondary

208/240 Vac,

50/60 Hz

400 Vac, 50/60 Hz

480 Vac, 50/60

Hz

b

Product specificaties