Why Choose the ETE MV400P2S3 400 VA Multi-Voltage Control Transformer?
The ETE MV400P2S3 is a 400 VA single-phase multi-voltage control transformer designed for industrial electrical installations requiring flexible primary voltage connections and selectable low-voltage AC outputs. Part of the ETE MV multi-voltage transformer series, it features 20/0/380/420 V primary terminals and two separate secondary windings, each marked 0/12 V.
The MV400P2S3 supports a nominal 12 V AC output with the secondary windings connected in parallel or a nominal 24 V AC output with the secondary windings connected in series. This flexibility makes it suitable for industrial control panels, OEM machinery and automation equipment requiring compatible 12 V or 24 V AC control supplies.
The transformer incorporates a 20 V primary adjustment tap alongside its 0/380/420 V primary terminal markings. This provides an additional connection facility within the primary winding arrangement. The correct use of the 20 V adjustment tap and the required primary terminal connections must be confirmed with ETE before installation. The terminal markings should not be used to infer an unverified adjustment connection.
With Class E insulation, 8% voltage regulation, dimensions of 120 × 108 × 120 mm and a weight of 5.5 kg, the ETE MV400P2S3 offers a practical solution for industrial control power distribution. Its associated enclosure references are EPH 3 or EPN 2, supporting enclosure selection and electrical panel planning.
Key Advantages
- 400 VA rated capacity: Provides dedicated AC power for compatible industrial control circuits and automation equipment.
- Multi-voltage primary arrangement: Incorporates 20/0/380/420 V terminals for the manufacturer's specified primary connection configurations.
- 12 V AC parallel output: Supports compatible low-voltage control and signalling equipment.
- 24 V AC series output: Provides an alternative control voltage for compatible industrial devices.
- Dual secondary windings: Two 0/12 V winding groups allow flexible output configuration.
- 20 V primary adjustment tap: Provides an additional primary connection facility, subject to confirmation of the correct wiring arrangement with ETE.
- Single-phase construction: Suitable for dedicated AC control voltage transformation.
- Class E insulation: Provides a defined thermal insulation classification.
- 8% voltage regulation: Provides a specified indication of secondary voltage variation under changing load conditions.
- Compact transformer dimensions: The 120 × 108 × 120 mm format assists with electrical panel space planning.
- 5.5 kg weight: Enables suitable mechanical support and mounting arrangements to be specified.
- EPH 3 or EPN 2 enclosure references: Help identify associated enclosure options for installation planning.
- Flexible output selection: Supports two commonly used low-voltage AC control supply arrangements.
- Industrial control transformer design: Suitable for integration into appropriately protected machinery and automation circuits.
Key Features
- ETE MV multi-voltage control transformer series.
- 400 VA rated apparent power.
- 0.4 kVA transformer capacity.
- Single-phase transformer configuration.
- Primary terminal arrangement: 20/0/380/420 V.
- Primary voltage terminal markings: 380 V and 420 V.
- Primary adjustment tap: 20 V.
- Primary connection requirement: Confirm correct adjustment tap connections with ETE.
- Secondary winding 1: 0/12 V.
- Secondary winding 2: 0/12 V.
- Parallel secondary configuration: 12 V AC.
- Series secondary configuration: 24 V AC.
- Winding connection flexibility: Supports series or parallel connection of the two secondary windings.
- Insulation class: E.
- Specified voltage regulation: 8%.
- Length: 120 mm.
- Width: 108 mm.
- Height: 120 mm.
- Weight: 5.5 kg.
- Associated enclosure references: EPH 3 or EPN 2.
Flexible 12 V and 24 V AC Control Power for Industrial Automation
The ETE MV400P2S3 provides a practical solution for industrial installations requiring a dedicated low-voltage AC supply from a compatible higher-voltage primary source. Its 20/0/380/420 V primary terminal arrangement incorporates nominal 380 V and 420 V connection positions alongside a 20 V adjustment tap. The correct primary supply and adjustment connections must be confirmed with ETE before energising the transformer.
A key feature is the provision of two separate 0/12 V secondary windings. When connected correctly in parallel, the windings provide a nominal 12 V AC output. Parallel operation combines the available current contribution of the two windings while retaining the transformer's overall 400 VA rating. Matching winding voltages and correct polarity are essential because incorrect parallel connections can produce damaging circulating currents.
When connected correctly in series, the two secondary windings provide a nominal 24 V AC output. This configuration adds the voltages of the individual 12 V windings while retaining the overall transformer apparent power rating. Correct winding polarity and terminal identification are essential, as an incorrect series connection may result in voltage cancellation or an unsuitable output.
At the rated 400 VA capacity, the calculated nominal secondary current is approximately 33.33 A at 12 V AC with the windings connected in parallel, or 16.67 A at 24 V AC with the windings connected in series. These figures are calculated from the transformer apparent power rating and nominal output voltages rather than separately verified manufacturer current ratings. The 400 VA rating applies to the transformer as a whole and must not be interpreted as 400 VA independently available from each secondary winding.
The specified 8% voltage regulation is relevant when evaluating secondary voltage variation under changing load conditions. Actual output voltage depends on the primary supply, selected terminals, winding configuration and connected load. Equipment with narrow operating voltage tolerances should be checked for compatibility, particularly where control relays, contactor coils, solenoids or other inductive devices introduce changing loads and starting currents.
With Class E insulation, dimensions of 120 × 108 × 120 mm and a weight of 5.5 kg, the MV400P2S3 can be incorporated into appropriately engineered industrial control assemblies. Its EPH 3 or EPN 2 enclosure references assist with enclosure planning. Installers should provide suitable mechanical support, primary and secondary circuit protection, conductor sizing, ventilation and electrical clearances, following the manufacturer's instructions for both primary and secondary winding connections.
Typical Applications
- Industrial control circuits requiring a nominal 12 V AC supply.
- Industrial control circuits requiring a nominal 24 V AC supply.
- Electrical control panels with compatible 380 V or 420 V primary supply arrangements.
- Industrial machinery and OEM automation equipment.
- Motor control panels requiring dedicated low-voltage AC control power.
- Control relays and contactors with compatible AC coil voltages.
- Industrial signalling and indication circuits.
- Low-voltage AC solenoid and actuator circuits within the transformer rating.
- Machinery electrical cabinets and control enclosures.
- Industrial process control equipment with suitable AC loads.
- Electrical panel building and automation system integration.
- Control transformer replacement and maintenance projects.
- Equipment requiring series-connected or parallel-connected transformer secondary windings.
- Control circuit upgrades requiring a 400 VA multi-voltage transformer.
