1. Introduction
This manual provides essential information for the safe and efficient installation, operation, and maintenance of your Paulmann N105 Electronic Halogen Transformer. Please read these instructions carefully before use and retain them for future reference. Incorrect installation or operation can lead to hazards or damage to the product.
Safety Instructions
- Installation must be performed by a qualified electrician in accordance with local wiring regulations.
- Ensure the power supply is disconnected before installation, maintenance, or troubleshooting.
- Do not exceed the maximum load of 105W or go below the minimum load of 35W.
- This transformer is designed for low-voltage (12V) halogen lamps only.
- Ensure adequate ventilation around the transformer to prevent overheating.
- Do not cover the transformer with insulating material.
- The transformer is protected against short circuits, overload, and overheating.
- Protection Class II: This product is double insulated and does not require an earth connection.
2. Product Overview
The Paulmann N105 is an electronic low-voltage transformer designed for halogen lamps, offering a power range of 35W to 105W. It features a compact design, dimmability, and integrated safety mechanisms including temperature control and electronic protection. This transformer converts 220-240V AC mains voltage to 12V AC low voltage suitable for compatible halogen lighting systems.

An image of the Paulmann N105 electronic halogen transformer, showing its compact white casing and printed specifications including input/output voltage, power rating, and safety certifications.
Key Features:
- Electronic transformer for NV-Halogen Lamps.
- Input Voltage: 220-240V AC, 50Hz.
- Output Voltage: 11.5V AC.
- Power Range: 35W minimum to 105W maximum.
- Dimmable with phase cut or phase cut dimmers.
- Integrated temperature sensor and electronic protection.
- Compact dimensions for easy installation.
- RoHS compliant.
3. Setup and Installation
Follow these steps for proper installation of the Paulmann N105 transformer. Always ensure power is disconnected before starting.
- Power Disconnection: Turn off the main power supply at the circuit breaker before beginning any electrical work. Verify that the power is off using a voltage tester.
- Mounting Location: Choose a suitable location for mounting the transformer. It should be easily accessible for future maintenance, well-ventilated, and protected from moisture and direct heat sources. The transformer is designed for wall mounting.
- Wiring Input (Primary Side):
- Connect the 220-240V AC mains supply to the primary input terminals (marked "PRI" or "220-240V~").
- Ensure correct polarity: Live (L) and Neutral (N) connections.
- Use appropriate cable types and sizes (e.g., 0.75mm² as indicated on the unit).
- Wiring Output (Secondary Side):
- Connect the 12V AC output terminals (marked "SEC" or "11.5V~") to your low-voltage halogen lamps.
- Ensure the total wattage of connected lamps is within the transformer's operating range (35W to 105W).
- Do not connect more than the maximum allowed number of lamps or exceed the total wattage.
- Secure Connections: Double-check all wiring connections to ensure they are secure and properly insulated. Loose connections can cause overheating or electrical hazards.
- Mounting the Transformer: Secure the transformer to the chosen surface using appropriate screws. Ensure it is firmly fixed and not subject to vibration.
- Power Restoration: Once all connections are secure and the transformer is mounted, restore power at the circuit breaker.
- Testing: Test the connected halogen lamps to ensure they function correctly.
Note: This transformer is dimmable. If connecting to a dimmer, ensure the dimmer is compatible with electronic transformers and is a phase-cut type.
4. Operating Instructions
The Paulmann N105 transformer operates automatically once correctly installed and powered. It converts the incoming mains voltage to the required low voltage for your halogen lamps.
- Power On/Off: Control the lighting system using the wall switch connected to the primary side of the transformer.
- Dimming: If a compatible phase-cut dimmer is installed, you can adjust the brightness of the connected halogen lamps by operating the dimmer switch. Ensure the dimmer's minimum load is met by the connected lamps.
- Automatic Protection: The transformer is equipped with electronic protection against short circuits, overload, and overheating. In case of a fault, the transformer may temporarily shut down. Disconnect power, rectify the fault, and then restore power.
5. Maintenance
The Paulmann N105 transformer requires minimal maintenance. Regular checks can help ensure its longevity and safe operation.
- Cleaning: Periodically clean the exterior of the transformer with a dry, soft cloth. Do not use liquid cleaners or solvents. Ensure power is disconnected before cleaning.
- Ventilation: Ensure that the ventilation openings around the transformer are not obstructed. Good airflow is crucial for dissipating heat.
- Connection Checks: Annually, or if you notice any flickering or intermittent operation, disconnect power and check all wiring connections for tightness and signs of wear or damage.
- Lamp Replacement: When replacing halogen lamps, ensure they are of the correct voltage (12V) and that the total wattage remains within the transformer's 35W-105W operating range.
6. Troubleshooting
If you encounter issues with your Paulmann N105 transformer, refer to the following troubleshooting guide:
| Problem | Possible Cause | Solution |
|---|---|---|
| Lamps do not light up. |
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| Lamps flicker or dim unexpectedly. |
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| Transformer makes unusual noise. |
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If the problem persists after following these steps, consult a qualified electrician.
7. Specifications
| Brand | Paulmann |
| Model Number | N105 |
| Type | Electronic Halogen Transformer |
| Input Voltage (Primary) | 220-240V AC, 50Hz |
| Input Current | 0.44A |
| Power Factor (λ) | 0.98 |
| Output Voltage (Secondary) | 11.5V AC |
| Power Range | Min. 35W - Max. 105W |
| Dimmable | Yes, with phase-cut dimmers |
| Ambient Temperature (ta) | Max. 50°C |
| Case Temperature (tc) | Max. 85°C |
| Protection Class | II (Double Insulated) |
| Safety Features | Temperature controller, Electronic protection, Short-circuit protection, Overload protection |
| Dimensions (L x W x H) | 122 mm x 40 mm x 20 mm |
| Weight | 120 grams |
| Mounting Type | Wall mount |
| Compliance | RoHS, CE |
8. Warranty and Support
Paulmann products are manufactured to high-quality standards. For warranty information and customer support, please refer to the official Paulmann website or contact your local distributor. Keep your purchase receipt as proof of purchase.
For technical assistance or further inquiries, please visit www.paulmann.com or contact Paulmann customer service.

