Why Choose the ETE MV400P2S1 400 VA Multi-Voltage Control Transformer?
The ETE MV400P2S1 is a 400 VA single-phase multi-voltage control transformer designed for industrial electrical control panels, machinery and automation systems requiring a nominal 55 V AC or 110 V AC control supply. Part of the ETE MV Multi-Voltage Series, it features 20/0/380/420 V primary terminals and 0/55/110 V secondary terminals, providing flexible voltage connections for industrial control applications.
The transformer is suited to installations where a higher-voltage AC supply must be converted to a lower-voltage control circuit supply. Its multi-tapped primary arrangement includes 380 V and 420 V terminal markings, while its secondary winding provides selectable 55 V and 110 V output taps. The precise primary connections must be selected using the manufacturer's approved wiring instructions.
With a 400 VA rated capacity, Class E insulation and 8% voltage regulation, the MV400P2S1 provides a practical solution for appropriately rated control equipment. It measures 120 × 108 × 120 mm, weighs 5.5 kg and has specified enclosure references of EPH 3 or EPN 2.
Important connection note: The primary winding includes a 20 V adjustment tap. The exact terminal connections and adjustment method must be confirmed with ETE before installation or energisation.
Key Advantages
- 400 VA rated capacity: Provides apparent power for appropriately sized industrial control, switching and signalling circuits.
- Multi-voltage primary: Features 20/0/380/420 V terminals for manufacturer-specified industrial supply arrangements.
- Selectable secondary voltage: Provides nominal 55 V AC or 110 V AC output connections.
- Tapped secondary winding: Allows selection between two control voltage levels without changing transformer models.
- 20 V primary adjustment tap: Offers an additional winding connection feature, subject to ETE confirmation.
- 8% voltage regulation: Provides a specified regulation characteristic for control circuit design.
- Class E insulation: Offers a defined insulation classification.
- Industrial control applications: Suitable for compatible relays, contactors and machinery control equipment.
- Compact construction: Measures 120 × 108 × 120 mm for integration into electrical cabinets.
- Defined installation weight: Weighs 5.5 kg for mechanical mounting considerations.
- Enclosure flexibility: Specified enclosure references EPH 3 or EPN 2.
Key Features
- ETE MV Multi-Voltage Series industrial control transformer.
- 400 VA rated apparent power.
- Single-phase transformer configuration.
- 20/0/380/420 V primary terminal arrangement.
- 380 V and 420 V primary terminal markings.
- 20 V primary adjustment tap requiring manufacturer connection confirmation.
- 0/55/110 V secondary terminal arrangement.
- Nominal 55 V AC or 110 V AC secondary output connections.
- Class E insulation.
- 8% specified voltage regulation.
- 120 mm length.
- 108 mm width.
- 120 mm height.
- 5.5 kg weight.
- EPH 3 or EPN 2 enclosure references.
- Listed in the ETE Stock Control Transformer Range, March 2026.
Multi-Voltage Primary Connections and 20 V Adjustment Tap
The ETE MV400P2S1 features a 20/0/380/420 V primary terminal arrangement, allowing connection to the industrial AC supply configurations specified by ETE. The primary winding includes terminals marked for nominal 380 V and 420 V arrangements, together with an additional 20 V terminal.
This flexibility is useful for panel builders and machinery manufacturers designing electrical control equipment for different supply voltage requirements. The correct connection must be selected according to the available supply and the manufacturer's approved terminal diagram.
The 20 V primary adjustment tap provides an additional connection feature, but the exact adjustment method must not be inferred solely from the terminal markings.
Installation requirement: Confirm the correct primary connections, including the 20 V adjustment tap, with ETE before energising the transformer. Incorrect connections can result in unintended secondary voltages or transformer damage.
Selectable 55 V and 110 V AC Secondary Output
The MV400P2S1 incorporates 0/55/110 V secondary terminals, providing two nominal secondary voltage options for compatible industrial control circuits.
110 V AC Secondary Connection
When the full secondary winding is connected for a nominal 110 V AC output, the transformer's 400 VA rating corresponds to a calculated output current of approximately 3.64 A.
This arrangement is suitable for appropriately rated 110 V AC control equipment, including contactor coils, relays, switching circuits and machinery control devices.
55 V AC Secondary Tap
The intermediate secondary terminal provides a nominal 55 V AC output connection. This is useful where compatible industrial control equipment requires a lower AC control voltage.
Dividing the total transformer rating by 55 V produces a theoretical current of approximately 7.27 A. However, this calculation does not establish the permissible current or apparent power available from the individual 55 V winding section.
Engineering consideration: Confirm the permissible 55 V tap loading with ETE before designing a circuit around the theoretical current. The transformer rating must not be assumed to apply independently to every tap.
8% Voltage Regulation for Industrial Control Circuits
The MV400P2S1 has a specified 8% voltage regulation characteristic. Voltage regulation describes the variation in secondary voltage as transformer loading changes under the relevant operating conditions.
This characteristic should be considered when selecting voltage-sensitive industrial control devices, particularly contactors and relays that may experience short-duration switching inrush currents.
For correct transformer selection, engineers should consider the total connected apparent power, expected operating load, starting or energisation demands and the permissible voltage range of the connected equipment.
Industrial Construction and Installation Considerations
The ETE MV400P2S1 measures 120 mm in length, 108 mm in width and 120 mm in height, with a specified weight of 5.5 kg. These dimensions allow electrical panel builders to plan mounting space and mechanical support within appropriately designed control cabinets.
The transformer has Class E insulation, and the manufacturer's specified enclosure references are EPH 3 or EPN 2. The enclosure and mounting arrangement should be selected to provide suitable ventilation, mechanical protection and accessibility for the intended installation.
Primary and secondary circuit protection, conductor sizing, protective earthing and terminal connections should be designed in accordance with the applicable electrical installation requirements and ETE's technical instructions.
The manufacturer's approved connection diagram should be used to verify the primary adjustment tap and secondary voltage selection before commissioning.
Typical Applications
- Industrial control panels requiring nominal 110 V AC control power.
- Control circuits requiring a nominal 55 V AC secondary tap.
- Industrial contactor and relay control systems.
- Motor starter and motor control equipment.
- Factory automation and production machinery.
- OEM machinery and electrical equipment manufacturing.
- Industrial switching and signalling circuits.
- Electrical control voltage adaptation from higher-voltage AC supplies.
- Control cabinet assembly and electrical panel building.
- Industrial maintenance and machinery refurbishment.
- Replacement transformer applications where the electrical ratings and dimensions are suitable.
- Applications requiring a 400 VA single-phase multi-voltage control transformer.
