Why Choose the ETE MV150P3S3 150 VA Multi-Voltage Control Transformer?
The ETE MV150P3S3 is a versatile 150 VA single-phase multi-voltage control transformer featuring dual 120 V primary windings and dual 12 V secondary windings. Part of the ETE MV Multi-Voltage Series, it provides flexible electrical connections for industrial control panels, machinery, automation systems and OEM equipment requiring a nominal 12 V AC or 24 V AC output.
Its 0/120 V + 0/120 V primary terminals allow the two primary windings to be connected in parallel for a 120 V AC supply or in series for a 240 V AC supply. The 0/12 V + 0/12 V secondary terminals offer corresponding flexibility, with parallel connection providing 12 V AC and series connection providing 24 V AC.
With Class E insulation, 10% voltage regulation, dimensions of 96 × 76 × 103 mm and a weight of 2.3 kg, the MV150P3S3 provides a compact control power solution. The specified enclosure references are EPH 2 or EPN 1.
Key Advantages
- Dual primary voltage configuration: Connect the two 120 V primary windings in parallel for 120 V AC or in series for 240 V AC.
- Selectable secondary voltage: Configure the two 12 V secondary windings for 12 V AC parallel or 24 V AC series operation.
- 150 VA rated capacity: Suitable for appropriately sized industrial control and signalling circuits.
- Flexible electrical design: Accommodates two primary supply voltages and two secondary output configurations.
- Class E insulation: Provides a defined insulation classification for industrial transformer applications.
- 10% voltage regulation: Supports informed selection of connected equipment where loading conditions vary.
- Continuous-rated operation: Designed for industrial control circuit applications.
- IP20 touch-proof terminals: Help reduce accidental contact with electrical terminal connections.
- Class H varnish impregnation: Supports the durability of the transformer windings.
- Protective core earth connection: Facilitates appropriate protective earthing.
- Compact construction: Measures 96 × 76 × 103 mm for integration into control cabinets.
- DIN rail mounting option: Offers additional flexibility for suitable panel installations.
- Enclosure options: Specified references EPH 2 or EPN 1.
Key Features
- ETE MV Multi-Voltage Series control transformer.
- 150 VA rated apparent power.
- Single-phase transformer configuration.
- 0/120 V + 0/120 V primary terminal arrangement.
- Two individual 120 V AC primary windings.
- 120 V AC primary operation with correctly phased parallel windings.
- 240 V AC primary operation with correctly phased series windings.
- 0/12 V + 0/12 V secondary terminal arrangement.
- Two individual 12 V AC secondary windings.
- 12 V AC secondary output with parallel winding connection.
- 24 V AC secondary output with series-aiding winding connection.
- 50/60 Hz operating frequency.
- Class E insulation system.
- 10% voltage regulation.
- Continuous-rated control circuit transformer.
- IP20 touch-proof terminals.
- Class H varnish-impregnated windings.
- Protective core earth connection.
- Designed to EN 61558-1.
- Specified ambient temperature range of −10 to +35 °C.
- DIN rail mounting option.
- 96 × 76 × 103 mm overall dimensions.
- 2.3 kg product weight.
- EPH 2 or EPN 1 enclosure references.
Dual 120 V Primary Windings for 120 V or 240 V AC Operation
The ETE MV150P3S3 incorporates two separate 0/120 V primary windings, providing a flexible alternative to a transformer with a single fixed primary voltage. This design allows the transformer to operate from either a nominal 120 V AC or 240 V AC supply, depending on how the primary windings are connected.
120 V AC Parallel Primary Connection
For a nominal 120 V AC supply, the two primary windings are connected in parallel according to the manufacturer's wiring diagram. Correct winding polarity is essential to prevent opposing connections and potentially damaging circulating currents.
240 V AC Series Primary Connection
For a nominal 240 V AC supply, the two 120 V primary windings are connected in series, allowing the supply voltage to be shared across the windings. The correct series connection must be established using the manufacturer's terminal identification and connection instructions.
This dual-primary arrangement makes the MV150P3S3 suitable for electrical panel builders and OEM machinery manufacturers producing equipment for installations with different supply voltages. The primary winding configuration must be selected before energisation, and the manufacturer's wiring diagram must be followed.
Dual 12 V Secondary Windings for 12 V or 24 V AC Output
The transformer features two separate 0/12 V secondary windings, enabling a nominal 12 V AC or 24 V AC output depending on the selected winding arrangement. This provides flexibility for industrial control circuits requiring different low-voltage AC supplies.
12 V AC Parallel Secondary Connection
When the two 12 V secondary windings are connected correctly in parallel, the transformer provides a nominal 12 V AC output. Based on its total 150 VA rating, the calculated full-load output current is approximately 12.5 A.
Parallel connection requires the windings to have the correct polarity and matching voltages. Incorrect connections may cause excessive circulating current, overheating or transformer damage. The manufacturer's connection diagram should always be followed.
24 V AC Series Secondary Connection
When the two secondary windings are connected in the correct series-aiding arrangement, their voltages combine to provide a nominal 24 V AC output. At 150 VA, the calculated full-load secondary current is approximately 6.25 A.
This configuration is suitable for appropriately rated 24 V AC control equipment, including relays, contactors, actuators and signalling devices. The total load, switching inrush and voltage regulation requirements should be considered during transformer selection.
Engineering note: The calculated output currents assume the full 150 VA rating is available in the selected winding configuration. The manufacturer's connection instructions, permissible winding loading and terminal ratings should be checked before installation.
Compact Industrial Construction and Installation Flexibility
With dimensions of 96 mm in length, 76 mm in width and 103 mm in height, the MV150P3S3 is well suited to installation within industrial control panels and electrical machinery cabinets. Its 2.3 kg weight allows it to be accommodated within appropriately designed mounting arrangements.
The transformer features Class E insulation, Class H varnish impregnation, IP20 touch-proof terminals and a protective core earth connection. It is designed to EN 61558-1 for continuous-rated control circuit applications, with a specified ambient temperature range of −10 to +35 °C.
A DIN rail mounting option is available for this transformer size, providing flexibility for compatible panel installations. The specified enclosure references are EPH 2 or EPN 1. Suitable mechanical support, ventilation, conductor sizing, protective earthing and electrical protection should be incorporated into the complete installation.
Typical Applications
- Industrial control panels requiring 12 V AC or 24 V AC supplies.
- Machinery control systems operating from 120 V AC or 240 V AC primary supplies.
- Industrial contactor and relay control circuits.
- 24 V AC actuators and compatible control devices.
- 12 V AC switching and signalling equipment.
- Motor starter and motor control assemblies.
- Factory automation and production machinery.
- OEM machinery and electrical equipment manufacturing.
- Electrical control panel building and system integration.
- Industrial machinery refurbishment and maintenance.
- Applications requiring configurable dual primary and dual secondary windings.
- Electrical installations requiring a compact 150 VA single-phase control transformer.
