Introduction
This manual provides essential information for the safe and efficient operation of your Hatch RS12-105 Halogen Transformer. Please read these instructions carefully before installation and use, and retain them for future reference.
The Hatch RS12-105 is a 120V-12V, 105W dimmable halogen transformer designed for use with 12-volt halogen lamps. It features leads out on both sides for flexible installation.
Product Features
- Moisture Resistant
- Low Harmonic Distortion
- High Power Factor
- Electronic Overload Protection Circuit
- No-Load Detection Circuit
Safety Information
WARNING: Risk of Electric Shock. Installation should be performed by a qualified electrician in accordance with all local and national electrical codes.
- Ensure power is disconnected at the circuit breaker before installation or servicing.
- Do not exceed the maximum wattage of 105W.
- This transformer is designed for 12-volt halogen lamps only.
- Do not immerse in water.
- Ensure proper ventilation to prevent overheating.
Setup and Installation
Follow these steps for proper installation of the Hatch RS12-105 transformer:
- Disconnect Power: Turn off power at the main circuit breaker before beginning any installation work.
- Mounting: Securely mount the transformer in a suitable location, ensuring adequate ventilation. The product dimensions are approximately 6.14 x 1.79 x 1.33 inches.
- Input Wiring (120V AC): Connect the 120V AC input wires to the transformer's input leads. The transformer has black and white input leads. Connect the black wire to the hot (line) conductor and the white wire to the neutral conductor.
- Output Wiring (12V AC): Connect the 12V AC output wires to your 12-volt halogen lamp(s). The transformer has red output leads. Ensure correct polarity if specified by the lamp manufacturer, though for AC halogen lamps, polarity is typically not critical.
- Dimmable Compatibility: This transformer is dimmable. Ensure your dimmer switch is compatible with low-voltage electronic transformers.
- Verify Connections: Double-check all wiring connections to ensure they are secure and correctly terminated.
- Restore Power: Once all connections are secure and verified, restore power at the circuit breaker.

Operating Instructions
Once installed, the Hatch RS12-105 transformer operates automatically when power is supplied. It converts 120V AC input to 12V AC output for your halogen lighting system.
- Power On/Off: Control the lighting system using the connected wall switch or dimmer.
- Dimming: If connected to a compatible dimmer, adjust the dimmer switch to control the brightness of the halogen lamps.
- Overload Protection: The electronic overload protection circuit will automatically shut down the transformer if an overload condition is detected. Disconnect power, resolve the overload (e.g., replace faulty lamps, reduce total wattage), and then restore power.
- No-Load Detection: The no-load detection circuit ensures safe operation even if no load (lamps) is connected to the output.
Maintenance
The Hatch RS12-105 transformer is designed for long-term, maintenance-free operation. However, periodic checks can help ensure optimal performance and safety:
- Cleaning: Ensure the transformer is free from dust and debris, especially around ventilation areas, to prevent overheating. Use a dry, soft cloth for cleaning. Do not use liquid cleaners.
- Wiring Inspection: Periodically inspect all wiring connections for signs of wear, fraying, or loose terminals. Ensure connections remain secure.
- Lamp Replacement: When replacing halogen lamps, ensure they are 12-volt and that the total wattage does not exceed 105W. Always disconnect power before replacing lamps.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Lights do not turn on. | No power to transformer. Faulty lamp(s). Overload protection activated. Loose wiring connection. | Check circuit breaker and wall switch. Test or replace lamps. Disconnect power, reduce load, then restore power. Inspect and secure all wiring. |
| Lights flicker or dim inconsistently. | Incompatible dimmer. Loose connections. Lamp nearing end of life. | Ensure dimmer is compatible with electronic low-voltage transformers. Check and tighten all wiring connections. Replace affected lamp(s). |
| Transformer makes unusual noise. | Overload condition. Internal fault. | Disconnect power, reduce load, then restore power. If noise persists, discontinue use and consult a qualified electrician. |
If troubleshooting steps do not resolve the issue, consult a qualified electrician or contact Hatch customer support.
Specifications
| Specification | Detail |
|---|---|
| Model Number | RS12-105JC |
| Input Voltage | 120V AC |
| Output Voltage | 12V AC |
| Maximum Wattage | 105W |
| Dimmable | Yes |
| Dimensions (L x W x H) | 6.14 x 1.79 x 1.33 inches |
| Item Weight | 4 ounces (0.25 Pounds) |
| Features | Moisture Resistant, Low Harmonic Distortion, High Power Factor, Electronic Overload Protection Circuit, No-Load Detection Circuit |
Warranty and Support
For warranty information or technical support, please contact Hatch directly. Refer to the product packaging or the official Hatch website for the most current contact details.
Note: The warranty may be voided if the product is not installed or used in accordance with the instructions provided in this manual.





