OSRAM OPTOTRONIC OT 75/220-240/24 – LED Power Supply 24V, 75W, Constant Voltage (Non-Dimmable)
The OSRAM OPTOTRONIC OT 75/220-240/24 is a professional 24V DC constant voltage power supply for LED modules and strips, with a 75W output and SELV output for maximum safety. Designed for indoor use ( IP20 ) and independent mounting, it offers a high power factor (λ 0.97) , THD < 20% , and 90% efficiency , ensuring a stable and efficient power supply. It incorporates automatic and reversible electronic protection against over-temperature, overload, and short circuit, as well as no-load protection. Its compact size (220 × 47 × 44 mm) with a 180 mm mounting length facilitates integration into luminaires and renovation projects.
The output is stabilized with a tolerance of +1.0/−0.5 V and a maximum line ripple of ±0.2 V , protecting the LEDs' lifespan and maintaining luminous uniformity. It operates on 220–240 V AC, 50/60 Hz mains power, with a nominal input current of 0.38 A and an inrush current of 41 A. EMI verification was validated with a 2 m cable between the device and the LED module under full load; longer lengths are possible by selecting the appropriate cable cross-section.
Important: This model is non-dimmable (On/Off). For brightness control, use a 24V strip/module driver between the power supply and the load, or choose a compatible dimmable CV driver.
Main features
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Type: 24V constant voltage (CV) LED power supply.
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Useful power: 75 W (partial load 0…75 W).
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Output: 24 V DC ( +1.0/−0.5 V; ripple ±0.2 V ), SELV .
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Input: 220…240 V AC (perm. 198…264 V), 50/60 Hz; I n =0.38 A.
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Inrush: 41 A (pulse width approx. 200 µs).
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Performance: THD < 20%; power factor λ 0.97 (min.); efficiency 90% (at 230 V, full load); losses 9 W.
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Protections: automatic and reversible over-temperature, overload and short circuit protection; no-load proof .
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Construction: Protection class II; IP20 rating; plastic body.
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Dimensions and weight: 220 × 47 × 44 mm; wheelbase 180 mm; 290 g.
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Temperatures: T a −20…+50 °C; T c max. 80 °C; Housing Tª at failure 110 °C; storage −40…+85 °C.
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Cable length to LED: up to 10 m (EMI verified with 2 mA full load).
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Indicative MCB: up to 7 units (B10) / 11 units (B16).
Product benefits
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Stable and safe power supply for 24V LED strips and modules thanks to SELV output with tight tolerances and low ripple.
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Network efficiency and quality for professional installations: High λ and low THD reduce losses and disturbances.
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Long-term reliability : reversible protections and a service life of up to 50,000 h (at T c = 80 °C).
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Easy installation : compact format with standard 180 mm fixing and screw terminals on output.
Use cases
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24V LED strips for retail, hospitality, residential and office use.
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Signage and labels with 24V modules.
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Lighting for showcases and displays where a stable, constant voltage is required.
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Interior architectural applications (exterior only within suitable watertight enclosures).
Frequently Asked Questions
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Is it dimmable? No. This model is On/Off . For dimming, use a 24V driver between the source and the load or a compatible dimmable CV driver.
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What is the maximum output current? Approximately 3.13 A at 24 V for 75 W.
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Can I leave the output unloaded? Yes, it's no-load proof .
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What cable length can I use to run to the strip? Up to 10 m ; EMI compliance is verified with 2 m at full load. For longer runs, increase the cable cross-section to minimize voltage drop.
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Can it be used outdoors? Only inside enclosures with the appropriate IP rating ; the equipment is IP20 .
Installation Notes
- Maintain ventilation to avoid exceeding T c 80 °C at the test point.
- Consider the inrush 41 A when sizing circuit breakers and lines.
- Recommended cable sections: input 0.75…1.5 mm² ; output 0.5…1.5 mm² ; stripping 6 mm.
Project description
CV LED power supply 24 V DC, 75 W power; input 220…240 V AC (198…264 V), 50/60 Hz; In 0.38 A; inrush 41 A (≈200 µs); PF 0.97 (min.); THD < 20 %; efficiency 90 % (230 V, full load); losses 9 W; SELV output 24 V (+1.0/−0.5 V; ripple ±0.2 V); non-dimmable; cable to LED max. 10 m (EMI verified with 2 m); IP20; class II; T a −20…+50 °C; T c max. 80 °C; housing temperature at fault 110 °C; 220 × 47 × 44 mm; center-to-center distance 180 mm; 290 g; screw terminal outlet; compliant with IEC/EN 61347-2-13, IEC/EN 62384, EN 55015, IEC 61000-3-2, EN 61000-3-3, EN 61547; CE/ENEC/VDE marked.
