ETE MV150P2S3 150 VA Multi-Voltage Control Transformer – 12 V / 24 V AC Output
The ETE MV150P2S3 is a 150 VA single-phase multi-voltage industrial control transformer featuring a tapped primary winding and two independent 12 V AC secondary windings. Manufactured by Eastern Transformers & Equipment (ETE), it forms part of the MV stock control transformer range, designed for electrical panel builders, OEM machinery manufacturers and industrial automation applications.
The transformer features 20/0/380/420 V primary terminals and 0/12 V + 0/12 V secondary terminals. Its secondary windings can be connected in parallel to provide a nominal 12 V AC output, or in series to provide a nominal 24 V AC output. This dual-output flexibility makes it a practical choice for machinery and control panels requiring different low-voltage AC configurations.
A key feature of the MV150P2S3 is its 20 V primary adjustment tap. This provides additional primary connection flexibility, but the precise wiring arrangement must be established from the manufacturer's documentation. Confirm the correct primary terminal connections, including the 20 V adjustment tap, with ETE before installation.
Rated at 150 VA, with Class E insulation and 10% voltage regulation, the MV150P2S3 is designed for compatible industrial control loads. Its dimensions are 96 × 76 × 103 mm, with a specified weight of 2.3 kg. The applicable enclosure references are EPH 2 or EPN 1.
Key Advantages
- Flexible low-voltage output: Selectable nominal 12 V AC or 24 V AC secondary connection.
- 150 VA capacity: Suitable for appropriately rated industrial control circuits.
- Tapped primary winding: Features 20/0/380/420 V terminals.
- Primary adjustment provision: Includes a 20 V adjustment tap, with connections requiring ETE confirmation.
- Dual secondary windings: Two separate nominal 12 V windings.
- Parallel secondary configuration: Provides a nominal 12 V AC output.
- Series secondary configuration: Provides a nominal 24 V AC output.
- OEM design flexibility: One transformer model can accommodate either supported secondary configuration.
- Class E insulation: Specified insulation classification for the model.
- 10% voltage regulation: A defined performance characteristic for control circuit design.
- Compact construction: Measures 96 × 76 × 103 mm.
- Manageable weight: 2.3 kg.
- Enclosure references: EPH 2 or EPN 1.
- Industrial control suitability: Designed for integration into compatible control panels and machinery.
Key Features
- ETE MV multi-voltage control transformer series.
- 150 VA rated apparent power.
- Single-phase transformer construction.
- 20/0/380/420 V primary terminal arrangement.
- 20 V primary adjustment tap.
- 0/12 V + 0/12 V secondary terminal arrangement.
- Two nominal 12 V AC secondary windings.
- 12 V AC parallel secondary output.
- 24 V AC series secondary output.
- 50/60 Hz supply frequency.
- Continuous-rated control transformer design.
- Class E insulation system.
- 10% voltage regulation.
- IP20 touch-proof terminals.
- Class H varnish impregnation.
- Core earth connection.
- DIN rail mounting option, subject to the correct mounting arrangement.
- 96 × 76 × 103 mm dimensions.
- 2.3 kg weight.
- EPH 2 or EPN 1 enclosure references.
Understanding the Multi-Voltage Primary Connections
The ETE MV150P2S3 has a primary terminal arrangement marked 20/0/380/420 V. These markings identify the manufacturer's tapped primary configuration, which is intended for compatible industrial AC supply arrangements.
The inclusion of a 20 V primary adjustment tap is an important distinguishing feature. It provides a means of selecting an appropriate primary winding connection, but the exact relationship between the terminals and the applied supply must be confirmed using the ETE wiring diagram.
The terminal markings should not be interpreted as four independent primary supply options. In particular, the 20 V terminal must not be treated as an independently rated primary input without explicit manufacturer confirmation.
Important: Before energising the transformer, confirm the intended primary voltage and terminal connections with ETE. Incorrect primary wiring may result in an unsuitable secondary voltage, excessive winding current or transformer damage.
Selectable 12 V AC or 24 V AC Secondary Output
The MV150P2S3 incorporates two separate 0/12 V secondary windings. These provide flexibility for industrial control circuits requiring either a nominal 12 V AC or 24 V AC supply.
12 V AC Parallel Secondary Connection
When the two secondary windings are correctly connected in parallel, the output remains at a nominal 12 V AC. The windings share the connected load, allowing their current capabilities to be combined within the transformer's overall 150 VA rating.
Correct winding polarity is essential. The secondary windings must be connected in phase according to the manufacturer's wiring diagram. An incorrect parallel connection can create excessive circulating current and damage the transformer.
24 V AC Series Secondary Connection
When the two secondary windings are correctly connected in series, their nominal voltages add together to provide 24 V AC.
The winding connections must be arranged so that the voltages add rather than oppose one another. The manufacturer's terminal identification and connection diagram should always be followed.
The ability to select either 12 V AC or 24 V AC makes the MV150P2S3 suitable for consideration in machinery and control panel designs that use different low-voltage AC control equipment.
150 VA Output Capacity and Calculated Secondary Current
The 150 VA apparent power rating applies to the complete transformer, not independently to each secondary winding. The nominal current corresponding to each output configuration can be calculated using:
Current (A) = Apparent power (VA) ÷ Secondary voltage (V)
Calculated Current at 12 V AC
For a correctly configured 12 V AC parallel output:
150 VA ÷ 12 V = 12.50 A
This is the calculated total current corresponding to the transformer rating. It assumes correct parallel winding operation and does not constitute a separate manufacturer-published terminal current rating.
Calculated Current at 24 V AC
For a correctly configured 24 V AC series output:
150 VA ÷ 24 V = 6.25 A
This is the calculated nominal current corresponding to the transformer rating in the series configuration.
The selected transformer must be suitable for the total connected apparent power and the operating characteristics of the load. Where electromagnetic contactors, relays or other inductive devices are used, their energisation and inrush requirements should also be considered.
What Does 10% Voltage Regulation Mean?
The ETE MV150P2S3 has a specified 10% voltage regulation. Transformer voltage regulation describes the change in secondary voltage between no-load and rated-load conditions under defined operating or test conditions.
Consequently, the actual secondary voltage may vary as the load changes. Electrical designers should consider this characteristic when selecting equipment with defined operating voltage tolerances.
The MV150P2S3 is an AC transformer rather than an electronic voltage regulator. Its 12 V AC and 24 V AC ratings are nominal output values associated with the correct winding configurations.
Typical Applications
- Industrial electrical control panels requiring 12 V AC or 24 V AC.
- OEM machinery with configurable low-voltage AC control circuits.
- Factory automation and industrial process control equipment.
- Electrical panel-building projects using dual secondary windings.
- Compatible AC relay and contactor control circuits.
- Industrial switching and auxiliary electrical systems.
- Packaging, manufacturing and processing machinery.
- Machine control cabinets requiring a dedicated AC transformer.
- Compatible 12 V AC or 24 V AC indicators and control devices.
- Electrical assemblies requiring a series or parallel secondary winding arrangement.
- Replacement applications requiring an electrically compatible 150 VA multi-voltage transformer.
- Control panels where a tapped primary configuration is required and has been verified with ETE.
Installation and Connection Considerations
The ETE MV150P2S3 should be installed by a suitably qualified person using the manufacturer's connection diagram. Before installation, confirm the available primary supply, required secondary output, connected load and intended winding arrangement.
Primary wiring: The 20/0/380/420 V terminals include a 20 V adjustment tap. Confirm the correct primary terminal connections with ETE before energising the transformer.
Secondary wiring: The two 0/12 V windings must be connected in parallel for 12 V AC or in series for 24 V AC. Correct winding polarity is essential in both configurations.
The installation must incorporate suitable primary and secondary circuit protection, appropriate conductor sizing, protective earthing, ventilation and secure mechanical mounting. The EPH 2 or EPN 1 enclosure references should be checked against the intended installation environment and mechanical requirements.
