ATM series autotransformers have the same magnetic structure as the standard transformers but instead of having two coils A.T. and B.T. made of two separate and insulated groups of coils, they present a single coil where the electric coil B.T. is represented by a part of the whole group od coils making coil A.T.
The reference to the equivalent volume power is calculated as follows:
Pe= V2-V1/V2xPn where:
Pe= equivalent power
Pn= nominal power
V1= inferior tension
V2= superior tension
Technical specifications:
– Voltage ratio 400-230Vac
– insulation class E
– frequency 50/60 Hz.
– open execution, protection level IP00
– ambient temperature 40°C
– frame with earth connection
– resin impregnated and tropicalised
– electric class of protection l
Essential information for order and offers inquiries:
– power in VA
– network tension and frequency
– output tension
– ambient temperature
– working ambient conditions
Nominal Tension: 230-400 Vac
Final code: Esempio : Autotrasformatore monofase da 100VA 0-230-400Vac = ATM010
Code Power
Va		 Watt loss
Watt		 Dv
%		 Vcc
%		 Dim.
H mm		 Dim.
L mm		 Dim.
P mm		 Dim.
P1 mm		 Dim.
X mm		 Dim.
Y mm		 Weight
Kg
ATM005 50 9 7 8 85 88 90 77 70 48 1,5
ATM008 80 10 7,8 7,5 85 88 100 87 70 58 2
ATM010 100 12 7,8 7,5 85 88 110 97 70 68 2,3
ATM015 150 16 6 7 95 100 110 100 80 72 3
ATM020 200 18 6 7,5 95 100 120 110 80 82 3,5
ATM025 250 23 7 6,5 115 125 100 97 100 72 4
ATM030 300 25 5 5,5 115 125 110 107 100 82 5
ATM040 400 33 5,5 5 115 125 120 117 100 92 5,6
ATM050 500 38 4,5 5 160 155 130 125 125 92 8
ATM075 750 60 4,2 4,3 160 155 150 145 125 112 10,5
ATM10 1000 70 4 4 160 155 170 165 125 132 14
ATM15 1500 85 3 4,5 200 200 144 130 132 100 17,5
ATM20 2000 115 3 3,5 200 200 170 160 132 126 22
ATM25 2500 120 3 3,5 200 200 190 180 132 146 25
ATM30 3000 150 3 3,3 200 200 200 190 132 165 30
ATM40 4000 165 3 3,2 200 200 230 220 132 186 38
ATM50 5000 200 3 3,5 230 260 260 250 132 184 45
Dv: tension drop from vacuum to full load – Vcc: short-circuit tension.
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