LED driver ballast Osram QT-FIT8 3X18, 4X18 — lifetime 50,000 h, AC 198–264 V, 50/60 Hz, -15–50 °C, width 40 mm, depth 280 mm, height 28 mm

Osram QT-FIT8 3X18, 4X18 is an electronic ballast and LED driver engineered for use in fluorescent and LED luminaire circuits. The unit provides regulated power to compatible lamps and modules and is specified for a rated lifetime of 50,000 hours. Designed for mains operation in the range AC 198–264 V at 50/60 Hz, it supports reliable performance across typical commercial and industrial installations. Its compact housing with dimensions 40 × 280 × 28 mm enables installation in narrow or shallow fixtures where space is limited.

Advantages

The device offers a long rated lifetime and stable output suitable for continuous or intermittent operation. Broad input voltage and frequency compatibility ensures consistent behavior on international mains supplies, while the compact form factor simplifies retrofits and new luminaire designs. The ballast is specified to operate within ambient temperatures from -15 °C to 50 °C, supporting a wide range of indoor environments.

Suitable for

• Retrofit of fluorescent luminaires to LED systems
• New compact luminaire assemblies with limited driver space
• Commercial and industrial lighting with mains supply 198–264 V
• Applications requiring long-life, maintenance-reducing drivers

Key specifications

• Rated lifetime: 50,000 hours
• Input voltage: AC 198–264 V
• Input frequency: 50/60 Hz
• Operational ambient temperature range: -15 °C to 50 °C
• Maximum input current: up to 15 A
• Physical dimensions (W × D × H): 40 × 280 × 28 mm
• Compatible lamp configurations: 3×18 W and 4×18 W circuits

How to use

Install the Osram QT-FIT8 in accordance with local electrical regulations and the luminaire manufacturer’s instructions. Ensure mains supply is within the specified 198–264 V and the circuit is de-energized before connection. Mount the driver inside the fixture using appropriate fixings for the given dimensions and provide sufficient clearance for heat dissipation. Connect input and output conductors following recommended wiring diagrams for the chosen lamp configuration (3×18 or 4×18), secure all connections, and verify correct polarity and insulation. After installation, restore mains power and perform functional checks to confirm normal lamp ignition and operation.

Recommendations

For reliable long-term operation, avoid installing the driver in locations where ambient temperature regularly exceeds the specified maximum or where airflow is restricted. Use in fixtures that allow some ventilation and follow recommended mounting orientation when provided by the luminaire manufacturer. Regularly inspect connections during scheduled maintenance and replace the driver if signs of overheating, corrosion, or mechanical damage appear.