70021 ACME ELECTRIC, 70021 Datasheet - Page 14

• Manufacturer Part Number: 70021
• Description: Toroidal Transformer
• Manufacturer: ACME ELECTRIC

Specifications of 70021

• Power Rating: 5VA
• Secondary Voltages: 2 X 9V
• Secondary Current Nom: 2mA
• Transformer Mounting: PC Board
• Weight: 144g
• Transformer Type: Toroidal
• Secondary Current Aac: 278mA
• Output Current, Secondary Series: 278mA
• Frequency: 60Hz
• Output Current: 278mA
• Rohs Compliant: Yes
• Primary Voltages: 2 X 115V
• Mounting Type: PC Board
• Features: Low Profile
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Frequently, in applications calling for simple voltage step-up or step-down,
and where there is no requirement for electrical isolation, applying an
autotransformer will result in significant size and weight reductions as well
as cost. The power rating of an autotransformer is given by the expression:
P
V
V
A rule of thumb to apply when considering an autotransformer is that
the voltage across the entire winding should be less than or equal to
two times (2x) the value of the lowest voltage tap (V
rated
low
hi
= P
= voltage from lower voltage tap (input or output)
= voltage across higher voltage tap (output or input)
1500VA Isolation Transformer and 1500VA Autotransformer
out
x (V
STEP DOWN AUTOTRANSFORMER
STEP UP AUTOTRANSFORMER
hi
AUTOTRANSFORMERS YIELD
REDUCED SIZE AND COSTS
- V
low
)/V
hi
COMPLIMENTARY PRODUCTS
hi
< 2V
[phone]
low
).
www.amveco.com
3-Phase toroidal transformers are simply three separate single phase
units. When convenient, they may be mounted as individual units, adding
flexibility to the design of the housing or, in many cases, stacked together
side by side or stacked on top of each other. For higher powered units,
the relative assembly labor is less using toroids where each phase may be
handled separately (usually by one person). Compare this to E-I trans-
former installations where a large single unit must be moved (requiring
several workers and a hoist).
3-Phase Toroidal Array Mounted in Flanges with Terminal Blocks
3-PHASE TRANSFORMERS
12