Why Choose the ETE WV250P7S7 Wide-Input-Voltage Control Transformer?
The ETE WV250P7S7 is a versatile 250 VA single-phase wide-input-voltage control transformer designed to provide reliable electrical isolation and flexible low-voltage AC power for industrial control panels, machinery and automation equipment. Part of the ETE WV Wide Input Voltage transformer series, it features multiple primary voltage taps covering 380–480 V AC and two separate 24 V AC secondary windings that can be connected in parallel for 24 V AC or in series for 48 V AC.
Manufactured by Eastern Transformers & Equipment (ETE), the WV250P7S7 provides an adaptable solution for electrical installations operating at different industrial supply voltages. Its wide selection of primary connections allows panel builders and equipment manufacturers to accommodate compatible 380 V, 400 V, 420 V, 440 V, 460 V and 480 V AC supplies without changing transformer models.
With a rated capacity of 250 VA, Class E insulation and 8% voltage regulation, the WV250P7S7 combines practical electrical performance with flexible secondary connection options. Measuring 120 × 88 × 120 mm and weighing 3.9 kg, it is suitable for integration into industrial electrical equipment, with EPH 3 or EPN 2 specified as compatible enclosure references.
Key Advantages
- 250 VA single-phase transformer suitable for industrial control and automation applications.
- Wide primary voltage selection covering 380–480 V AC through six nominal voltage taps.
- Dual 24 V AC secondary windings provide flexible low-voltage control power.
- 24 V AC parallel connection allows the secondary windings to operate together at the same nominal output voltage.
- 48 V AC series connection provides a higher nominal output voltage for compatible equipment.
- Electrical isolation between the primary supply and secondary control circuits.
- 8% voltage regulation provides a defined measure of secondary voltage variation under load.
- Class E insulation system supports dependable transformer operation.
- Compact construction helps simplify integration into electrical control panels.
- EPH 3 or EPN 2 enclosure references assist with protective enclosure selection.
Key Features
- ETE WV Wide Input Voltage transformer series.
- 250 VA rated apparent power.
- Single-phase control transformer configuration.
- Primary terminals: 0/380/400/420/440/460/480 V.
- Six selectable primary voltage taps for compatible industrial supplies.
- Secondary terminals: 0/24 V + 0/24 V.
- Two separate 24 V AC secondary windings.
- 24 V AC output with correctly phased parallel-connected secondary windings.
- 48 V AC output with correctly phased series-connected secondary windings.
- 8% voltage regulation.
- Class E insulation.
- EPH 3 or EPN 2 enclosure reference.
- 120 × 88 × 120 mm dimensions.
- 3.9 kg weight.
The ETE WV250P7S7 is designed for installations where different industrial supply voltages may be encountered. Its primary winding includes terminals marked 0/380/400/420/440/460/480 V, allowing the appropriate primary connection to be selected for the available nominal supply.
This arrangement makes the transformer particularly useful for OEM machinery manufacturers, industrial panel builders and equipment suppliers working with electrical systems that use different nominal voltages. By selecting the correct primary terminals, the transformer can be configured for compatible supplies without requiring a separate transformer model for each voltage.
The primary voltage taps are discrete connections rather than an automatic voltage-ranging system. The installer must select the correct terminals to match the supply and follow the manufacturer's wiring instructions before energising the transformer.
Flexible 24 V AC or 48 V AC Secondary Connections
One of the principal advantages of the WV250P7S7 is its dual-secondary winding arrangement. The transformer features two separate secondary windings, each with terminals marked 0/24 V, allowing the outputs to be configured for different control voltage requirements.
- Parallel connection — 24 V AC: The two secondary windings are connected in parallel using the correct winding polarity, maintaining a nominal 24 V AC output while allowing the windings to share the load.
- Series connection — 48 V AC: The two secondary windings are connected in series with the correct polarity to provide a nominal combined output of 48 V AC.
The 250 VA rating applies to the transformer as a whole and must not be interpreted as 250 VA available independently from each secondary winding. Winding polarity, current sharing, suitable protection and the permitted loading arrangement should be verified against ETE's connection instructions before installation.
These selectable outputs make the WV250P7S7 a practical choice for electrical control panels that may require either 24 V AC or 48 V AC control power, depending on the connected equipment.
Typical Applications
- Industrial electrical control panels requiring isolated 24 V AC or 48 V AC supplies.
- Machinery operating from nominal 380–480 V AC electrical systems.
- Industrial automation and machine control circuits.
- 24 V AC relays, contactors and compatible control devices.
- 48 V AC control and signalling equipment.
- OEM machinery manufactured for different international supply voltages.
- Building services and HVAC control systems.
- Industrial process control and production equipment.
- Electrical panel building and control system integration.
