Variable transformer
ESS 305 - Discontinued types – not for new designs
Characteristics
General data
Adjustable ring-core autotransformers of the ESS series are designed for low-loss generation of grid-connected AC voltages. This principle ensures optimal adaptation to the load, resulting in minimal power loss. The design of the current collector ensures continuous reliable contact
Benefits
› Continuous adjustment of alternating voltage from zero to the maximum value
› Self-cleaning of exposed contact tracks
› 4-point flange mounting
› Applicable to three-phase current when mechanically coupling three variable transformers
› Knobs and scales optionally available
| Product | Variable transformer |
| Order number | ESS 305 |
| Series | ESS |
| Power | 1,150 VA |
| Phases | 1 |
| Frequency range | 50 Hz to 60 Hz |
| EN Insulation class | B (130°C) |
| Duty Cycle | 100 % |
| Wire material | Copper |
General
| Short circuit proof | not short-circuit proof |
| Switching group | Ia0 |
| Cooling type | AN |
Environment
| Ambient temperature | -20 °C to 45 °C / -4 °F to 113 °F |
| Max. installation height | 2,000 m / 6,562 ft |
Protection and Safety
| Protection type | IP00 |
| Protection class (prepared) | I |
| Degree of contamination | 1 |
Electrical Connections
| Input terminal | Screw terminal |
| Output terminal | Screw terminal |
Size and Weight
| Width | 135 mm / 5.31 in |
| Height | 147 mm / 5.79 in |
| Depth | 159 mm / 6.26 in |
| Weight | 5.176 kg / 11.411 lbs |
| Low Voltage Directive | EN 61558-2-13 |
| RoHS compliant | EN IEC 63000 |
