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Manufacturer’s series: DM
Electrically separated primary and secondary windings for equipment isolation and noise control.
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An isolation transformer provides electrical separation between input and output windings. The brochure describes early adoption in European power applications and use in electronics, industrial and mining enterprises, machine tools and mechanical equipment to reduce or eliminate neutral-to-earth voltage. It may also supply general control circuits, safety lighting and indicator lamps.
The primary and secondary circuits are electrically insulated. High-frequency core losses help suppress high-frequency interference entering control circuits.
The brochure discusses floating secondary systems only for limited supply areas with short circuits and low earth-capacitance current. It also describes earthing one secondary terminal, designated as neutral, to reduce neutral-to-earth voltage below 0.2 V. These are descriptions of the source text, not a substitute for the project earthing and protection design.
The brochure emphasises separation from hazardous voltage as a personnel-protection function.
Operation is based on electromagnetic induction. The brochure describes a commonly used 1:1 transformer for servicing equipment with an unearthed secondary, but also explains that isolation transformers need not have a 1:1 ratio.
Examples include valve amplifiers, valve radios, oscilloscopes, lathe control supplies, colour-television servicing and air-conditioning equipment.
A non-closed copper sheet or non-magnetic conductive paper screen is installed between primary and secondary windings and connected to the enclosure. A surrounding shielding enclosure and screened winding terminals may be added to reduce external electromagnetic interference.
The brochure states that this leaves predominantly magnetic coupling and can reduce equivalent distributed capacitance below 0.01 pF, thereby reducing capacitive current and suppressing interference from the supply and other circuits.
| Capacity | Input voltage | Frequency | Output voltage | Overall dimensions (mm) |
|---|---|---|---|---|
| 0.5KVA | 220V or 380V | 50–60Hz | 220V or 380V | 280×140×155 |
| 1KVA | 220V or 380V | 50–60Hz | 220V or 380V | 285×155×162 |
| 1.5KVA | 220V or 380V | 50–60Hz | 220V or 380V | 320×195×190 |
| 2KVA | 220V or 380V | 50–60Hz | 220V or 380V | 440×300×320 |
| 3KVA | 220V or 380V | 50–60Hz | 220V or 380V | 440×300×320 |
| 5KVA | 220V or 380V | 50–60Hz | 220V or 380V | 440×300×320 |
| 6KVA | 220V or 380V | 50–60Hz | 220V or 380V | 440×300×320 |
| 8KVA | 220V or 380V | 50–60Hz | 220V or 380V | 440×300×320 |
| 10KVA | 220V or 380V | 50–60Hz | 220V or 380V | 300×320×420 |
DIMENSIONS / CONNECTIONS / SOURCE DATA
The original sheet retains all dimensioned drawings, connection diagrams, table footnotes and published values. It is supplied in its original language for direct verification against the English specification.
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Use the exact model, voltage, current or power rating, duty cycle and drawing reference when requesting a quotation. Confirm source discrepancies and project-specific requirements in the approved technical agreement.