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Transformer Fundamentals
Transformer Efficiency
Packing Density
Design Basics
Design Enhancements
Toroidal Transformers by Application:
Medical Isolation—AW
(UL544, CSA 22.3, UL60601-1, CSA 22.2, IEC601-1)
Medical Isolation—AM
(UL544, CSA 22.3)
General Purpose
(UL506, CSA C22.2)
Audio
(UL1411, UL6500,
CSA E60065)
Other:
Application Worksheet
Technical Guide & Specifications (pdf)
Submit Application Worksheet

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 
General Purpose Toroidal Transformer Product Detail
AU/BU Series

AU/BU series Toroidal Transformers are specially designed for use as broad, general purpose power transformers in accordance with UL506 and CSA-C22.2 No. 94.

General Specifications:
Primary:
 AU Series: 120/240V, 50/60Hz
BU Series: 120V 60Hz
Secondary: Dual, up to 120Vrms, as required
Standard Leads: PVC class A, 10" (25cm) long
Dielectric Strength: Primary to Secondary: 2500Vrms
Maximum Operating Temperature: 265°F (129°C)
Maximum Temperature Rise: 150°F (83°C) at rated power
Mounting: Type 2: Metal mounting disk with
            two insulating pads
Type 3: Molded-in threaded insert
Safety Recognition: UL506, CSA-C22.2 No. 94

Options:
• Other sizes and voltages up to 10KVA, 240V
• International safety agency compliance
• Magnetic shielding around circumference ot totally encompassing transformer
• Faraday shielding bewteen primary and secondary and/or secondary and secondary
• Mounting:
  — Washer/Insulators; — Tie wrap, Bolt Mount; — Molded-in Threaded Insert;
  — Encapsulated with leads; — PC Pins, Terminal Blocks
• Special mounting and/or marking arrangements
 

AU/BU Series Standard Design Data — Modified Standards Readily Available
Power (VA)
 AU Series
Part Number
(50/60Hz) 		Power (VA)

BU Series
Part Number
(60Hz Only)

Regulation
Full Load
(%)

Mounting
Type

 Size
O.D. x Ht
(inches)		 Weight
(Lbs)
20 AU202AD_D 24 BU202AS_D 17 2 2.7 x 1.5 0.8
30 AU203AD_D 36 BU203AS_D 17 2 2.7 x 1.9 1.2
40 AU204AD_D 48 BU204AS_D 16 2 3.5 x 1.5 1.5
60 AU206AD_D 72 BU206AS_D 13 2 3.5 x 1.8 1.9
80 AU208AD_D 96 BU208AS_D 12 2 4.2 x 1.7 2.1
100 AU210AD_D 120 BU210AS_D 11 2 4.2 x 1.9 2.3
160 AU216AD_D 200 BU216AS_D 10 2 4.7 x 2.0 3.1
230 AU223AD_D 275 BU223AS_D 8 2 4.7 x 2.5 5.5
330 AU233AD_D 400 BU233AS_D 7 2 4.8 x 3.1 6.8
400 AU240AD_D 480 BU240AS_D 7 2 5.7 x 2.6 7.5
530 AU253AD_D 640 BU253AS_D 6 2 5.7 x 3.2 9.8
600 AU260AD_D 720 BU260AS_D 5 2 5.7 x 3.5 11.0
750 AU275AD_D 900 BU275AS_D 5 2 6.3 x 3.5 13.0
1000 AU31A0D_D 1200 BU31A0S_D 5 3 6.3 x 3.8 16.0
1200 AU31A2D_D 1440 BU31A2S_D 5 3 6.3 x 4.5 18.0
1500 AU31A5D_D 1800 BU31A5S_D 5 3 7.9 x 3.5 21.0
2000 AU32A0D_D 2400 BU32A0S_D 5 3 7.9 x 4.1 28.0
Note: Dimensions include mounting hardware. — Data subject to Change.