RS Components
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35 → 105W Light Transformer, 230 → 240V ac, 11.3V ac

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If your project involves the space-critical installation or different cable types, consider a HALOTRONIC COMPACT transformer. The HTN version is extremely compact and ideal for use where space is tight, while the HTM has strain relief suitable for different cable types. They are dimmable on the leading edge (without HTN) and trailing edge, very energy-efficient and have electrical isolation between the primary and secondary sides. HALOTRONIC COMPACT protects from short-circuit, overtemperature and overload (electronically reversible), and is ideal where you wish to install accent and/or effect lighting, to light objects and for surface-mounted/recessed furniture luminaires. Other applications include living rooms, event and conference rooms, shop lighting and restaurant lighting. High levels of efficacy mean that HALOTRONIC COMPACT loses little power, and its protective operation throughout the partial-load range promotes lamp life.

The OSRAM HALOTRONIC COMPACT Transformers are available in two power rating options to choose from:
• HALOTRONIC HTM 70W/230…240 - 281-8128
• HALOTRONIC HTM 105W/230…240 - 281-8134

Features and Benefits:

• Very low power loss thanks to high efficacy
• Strain relief suitable for different cable types (HTM)
• Suitable for space-critical installation thanks to compact functional design
• Extremely compact transformer for highly space-critical installation conditions (HTN)
• Protective operation throughout the entire partial-load range for long lamp life
• Short-circuit protection, overload protection, overtemperature protection: electronically reversible
• Electrical isolation between the primary side and the secondary side
• Energy efficiency: ≥ 91 % (according to ErP regulation 2012/1194/EC)
• Dimmable on the leading edge and trailing edge

Approvals and Certification:

• RI suppression: to EN 55015 (A1: 2007)/CISPR 15, EN 55022
• Line harmonics according to EN 61000-3-2
• Immunity according to EN 61547
• Safety: to EN 61347

Typical Applications:

Some typical areas of lighting transformers applications are e.g.:
• Effect and accent lighting
• Living rooms
• Object lighting
• Conference rooms
• Restaurants
• Recessed and surface-mounted furniture luminaires
• Shop lighting
• Event rooms


Is this transformer suitable for LEDs?

Yes, the OSRAM HALOTRONIC HTL 225/23-240 7W is compatible with LED lighting. However, the dimming mode might not be available with all brands and models.

Low Voltage Lighting Transformers

Dimming Methods (where applicable):
Leading Edge:
The control device is either a thyristor or triac which blocks power until they are switched on by the control signal. At that point the current flows almost instantaneously and continues to flow until the end of the half cycle of the mains waveform. When the signal reaches zero, the device turns off and no more current is passed until it is triggered again. Turning the power on and off in this manner averages out creating a constant intensity level and by altering the precise trigger point over a period of time the lamp can be dimmed.

Trailing Edge:
Since this method of dimming uses transistor technology it is not limited to just switching, therefore current can be controlled gradually. Transistors can be programmed to pass current at the start of each half cycle, and gradually switch off later. This will control the full amount of power reaching the lamp without the side effects of a step increase in current.

Primary Voltage Rating230 → 240V ac
Secondary Voltage Rating11.3V ac
Power Rating35 → 105W
Dimensions108 x 52 x 33mm
Dimming MethodLeading Edge