ETE MV400P1S1 400 VA Multi-Voltage Control Transformer – 55 V / 110 V AC Output
The ETE MV400P1S1 is a 400 VA single-phase multi-voltage industrial control transformer featuring a tapped primary winding and selectable 55 V AC or 110 V AC secondary output. Part of the ETE MV stock control transformer range, this model offers a flexible AC control power solution for compatible industrial electrical panels, OEM machinery and automation equipment.
The transformer features 10/0/220/240 V primary terminals and 0/55/110 V secondary terminals. The secondary winding provides two nominal voltage options through its taps, allowing electrical designers to select the appropriate output for equipment requiring either 55 V AC or 110 V AC.
A distinguishing feature of the MV400P1S1 is its 10 V primary adjustment tap. This forms part of the tapped primary arrangement, but its precise function and approved terminal combinations must be confirmed with ETE. Do not infer the correct adjustment tap wiring from the terminal markings alone.
With a 400 VA apparent power rating, Class E insulation and 8% voltage regulation, the MV400P1S1 is a practical option for compatible industrial control loads. It measures 120 × 108 × 120 mm and weighs 5.5 kg.
The transformer is listed in the ETE Stock Control Transformer Range, March 2026, with specified enclosure references of EPH 3 or EPN 2.
Key Advantages
- Selectable secondary voltage: Nominal 55 V AC or 110 V AC output connections.
- 400 VA rated capacity: Provides an apparent power rating suitable for appropriately sized industrial control circuits.
- Tapped primary winding: Features 10/0/220/240 V terminals.
- Primary adjustment facility: Includes a 10 V adjustment tap, with connections requiring ETE confirmation.
- Tapped secondary winding: Features 0/55/110 V terminals.
- Flexible control voltage selection: Accommodates compatible 55 V AC or 110 V AC equipment.
- Class E insulation: Provides the specified insulation classification.
- 8% voltage regulation: Gives electrical designers a defined transformer regulation characteristic.
- Industrial panel integration: Suitable for consideration in compatible machinery and control cabinets.
- Defined mechanical dimensions: Measures 120 × 108 × 120 mm.
- Specified weight: 5.5 kg.
- Enclosure references: EPH 3 or EPN 2.
- Stock range identification: Listed as MV400P1S1 in the March 2026 ETE price list.
Key Features
- ETE MV multi-voltage control transformer series.
- 400 VA rated apparent power.
- Single-phase AC transformer.
- 10/0/220/240 V primary terminal arrangement.
- 10 V primary adjustment tap.
- 0/55/110 V secondary terminal arrangement.
- 55 V AC secondary tap.
- 110 V AC secondary tap.
- Selectable tapped secondary output.
- Class E insulation system.
- 8% specified voltage regulation.
- 120 × 108 × 120 mm overall dimensions.
- 5.5 kg specified weight.
- EPH 3 or EPN 2 enclosure references.
- Part of the ETE stock control transformer range.
The ETE MV400P1S1 incorporates a tapped primary winding with terminals marked 10/0/220/240 V. This arrangement is intended to support compatible AC supply configurations using the appropriate manufacturer-approved connections.
The 10 V primary adjustment tap is part of this arrangement. Its exact function and permissible terminal combinations must be verified with ETE before the transformer is energised. The terminal markings do not establish that the 10 V connection can be used as an independent supply input.
The secondary winding has terminals marked 0/55/110 V, providing nominal 55 V AC and 110 V AC output options. The selected output depends on the approved secondary tap connection and the correct primary supply arrangement.
These are alternative output taps on the specified secondary winding, not two independent 400 VA supplies. Any intended simultaneous use of multiple secondary taps, including permissible combined loading, should be confirmed with ETE.
55 V AC and 110 V AC Secondary Output Options
55 V AC Secondary Connection
The 55 V AC tap provides a nominal 55 V AC output for compatible control equipment. This option may be appropriate for specialist machinery, replacement installations or control circuits designed for 55 V AC operation.
The selected terminal connection and permissible tap loading should be checked against the manufacturer's technical documentation before a load is connected.
110 V AC Secondary Connection
The 110 V AC tap provides a nominal 110 V AC output for compatible industrial control equipment, including suitably rated relays, contactors and auxiliary control circuits.
The output voltage, load demand and equipment operating tolerances must be assessed together to determine whether the transformer is suitable for a particular application.
400 VA Output Capacity and Calculated Secondary Current
The MV400P1S1 has a rated apparent power of 400 VA. For a single-phase transformer, the nominal current corresponding to a specified voltage can be calculated using:
Current (A) = Apparent power (VA) ÷ Secondary voltage (V)
Calculated Current at 55 V AC
At a nominal 55 V AC output:
400 VA ÷ 55 V = approximately 7.27 A
This is the mathematical current corresponding to the complete 400 VA rating at 55 V AC. It does not independently confirm the manufacturer's permissible current rating for the 55 V tap.
Calculated Current at 110 V AC
At a nominal 110 V AC output:
400 VA ÷ 110 V = approximately 3.64 A
This is the mathematical current corresponding to the complete 400 VA rating at 110 V AC.
The overall 400 VA rating must not be counted separately for each secondary tap. Actual loading should remain within the applicable manufacturer ratings, with allowance for the operating characteristics and inrush requirements of connected equipment.
What Does 8% Voltage Regulation Mean?
The ETE MV400P1S1 has a specified 8% voltage regulation. Voltage regulation describes the change in transformer secondary voltage between no-load and rated-load conditions under defined conditions.
This characteristic matters because the actual secondary voltage may vary with the connected load. The nominal 55 V AC and 110 V AC outputs should not be interpreted as guaranteed constant voltages under all operating conditions.
When selecting the MV400P1S1 for voltage-sensitive equipment, engineers should consider both the transformer regulation characteristic and expected primary supply variation.
Typical Applications
- Industrial electrical control panels requiring 55 V AC or 110 V AC.
- OEM machinery with compatible AC control circuits.
- Electrical panel-building projects requiring a tapped secondary transformer.
- Factory automation and industrial process control equipment.
- Compatible 110 V AC relay and contactor circuits.
- Specialist machinery designed for 55 V AC control power.
- Industrial switching and auxiliary electrical assemblies.
- Packaging, manufacturing and processing machinery.
- Machine control cabinets requiring a dedicated AC transformer.
- Maintenance and replacement applications specifying a compatible 400 VA multi-voltage transformer.
- Electrical systems requiring a selectable 55 V or 110 V secondary tap.
- Control panels where the 10 V primary adjustment tap is required and its connections have been confirmed with ETE.
Installation and Terminal Connection Considerations
Before installing the ETE MV400P1S1, verify the available primary supply, intended secondary output voltage, total connected apparent power and correct terminal connections.
Primary wiring: The 10/0/220/240 V terminals include a 10 V adjustment tap. Confirm the correct connection arrangement with ETE before energising the transformer.
Secondary wiring: The 0/55/110 V terminals provide nominal 55 V AC or 110 V AC output options. Select the correct tap according to the manufacturer's wiring diagram and the connected equipment's voltage requirements.
Suitable primary and secondary circuit protection, conductor sizing, protective earthing where applicable, ventilation and secure mechanical mounting should be incorporated into the installation design.
The specified EPH 3 or EPN 2 enclosure references should be checked against the intended installation requirements. The references alone do not establish an enclosure's protection rating or confirm that an enclosure is included.
