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HTG Family

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Home › Products › VariacsiToroidal three-phase HTG Family

Toroidal three-phase Variacs

HTG Family

General Info
Metrel Variacs are made of high quality parts and have followed advanced technological studies.
The cooling surfaces have been improved and increased, to avoid extra heating at the brush contact point with with the track, even under continuous and heavy use.
The correct use is thus assured for longer periods and without performance losses.
The Variacs conform to the standards  VDE 0552 and international standards IEC 60989.

Assembly
The Variacs can be assembled either horizontally or vertically.
All models have three fixing points with screws, where they can be fixed to the device board.
The smaller models, M 15 and M 30, can be fixed to the board with a nut on a potentiometer regulation shaft .
Each model has a regulating knob and indication panel of the output power in percentage.

Ambient Temperature 
The Variacs are designed to assure a correct function up to 40 C.  Higher temperatures need a forced cooling system or a reduction of the Variac's services by 15% for every extra 10 C (ex.: a 20 A Variac must be reduced to 17 A max).

Maintenance
No particular maintenance is needed, when the Variac is used in normal conditions.  Periodical cleaning is required by eliminating dust from the contacts track, along with a check up of the brush, controlling that it is intact and long enough to allow a correct pressure of the spring .
In dirty and salty surroundings, it is advisable to clean the sampling track with fine sandpaper or a deoxidizer.
If the brush contact is no longer safe and must be substituted, please do the following:
- with a welder, unweld the the copper cord which gives current to the brush. Loosen the slider at the output connector and when the used brush comes off, insert a new one and reconnect it.
- tighten and adjust the slider two to three mm. from the sampling track surface.

Connections and Protections
The input power must not exceed 6% of the nominal, to avoid possible coil over heating.
The output circuit, conform to the standards VDE 0552-5.69, must be protected against voltage overloading and short circuiting with fuses and thermal protections.
The primary circuit must be protected with a delayed fuse with correct values for each output.

Technical features

Input power 400 V
Art. No. In A Output power Art. No. In A Output power Weight (kg) Model Fig..
HTG 400/1 1 690 HTG 450/0.8 0.8 624 4.85 3/M15 8
HTG 400/1.25 1.25 861 HTG 450/1 1 780
HTG 400/1.5 1.6 1104 HTG 450/1.4 1.4 1092 8.1 3/M30 9
HTG 400/2 2 1380 HTG 450/1.6 1.6 1248
HTG 400/2.5 2.5 1725 HTG 450/2 2 1560
HTG 400/3 3 2070 HTG 450/2.5 2.5 1950 11.9 3/M50
HTG 400/4 4 2760 HTG 450/3 3 234
HTG 400/4.5 4.5 3105 HTG 450/3.5 3.5 2730 15.1 3/M10 10
HTG 400/6 6 4140 HTG 450/4.5 4.5 3510
HTG 400/8 8 5520 HTG 450/6.3 6.3 4914 23.6 3/M200
HTG 400/10 10 6900 HTG 450/8 8 6240
HTG 400/12 12 8280 HTG 450/10 10 7800 29.8 3/M250
HTG 400/18 18 12420 HTG 450/15 15 11700 45.5 3/M300 11
HTG 400/23 23 15870 HTG 450/20 20 15600 48 3/M400 12
HTG 400/32 32 22080 HTG 450/30 30 23400 70.5 3/M500
Frequency in use:
50 at 400 Hz
Testing power:
2.5 kV (AC 50 Hz) between the metal parts and under pressure points.
Protection level: Classe 1

Dimensions

Model a b c d e f g h i Fig.
3/M15 154 - 246 80 100 48 87 15 - 8
3/M30 234 - 323 80 100 55 110 15 - 9
3/M50 243 - 323 110 124 64 128 18 -
3/M100 243 284 370 110 130 67 134 21 - 10
3/M200 243 284 370 160 178 90 180 21 -
3/M250 243 284 370 160 178 90 180 21 -
3/M300 - - 402 178 275 138 275 - 482 11
3/M400 - - 402 249 310 155 310 - 482 12
3/M500 - - 402 249 350 175 350 - 482

Technical sheet download in PDF

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