Name: MEAN WELL PWM-120-KN series: Constant-voltage PWM output KNX LED driver - PWM-120-12KN
Brand: MEAN WELL
SKU: PWM-120-12KN
Price: 167.06 USD
Availability: InStock

MEAN WELL PWM-120-KN series: Constant-voltage PWM output KNX LED driver - PWM-120-12KN

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Description

PWM-120-12KN — Constant-voltage PWM output KNX LED driver

MEAN WELL PWM-120-12KN is a 120 W constant-voltage PWM output LED driver rated at 12 V and 10 A, with 90–305 V AC or 127–431 V DC input. It provides KNX control in the standard KN configuration. The fanless Class II plastic housing and integrated KNX interface support dimmable LED-strip and constant-voltage LED-bulb installations without a KNX–DALI gateway.

Download MEAN WELL PWM-120-KN Datasheet (PDF)
Download MEAN WELL PWM-KN User Manual (PDF)
Download MEAN WELL LED Installation Manual (PDF)
Download MEAN WELL EMI Testing Guidance (PDF)

PWM-120-KN: PDF pages 8–14.

Electrical specifications

DC output voltage	12 V.
Rated output current	10 A.
Rated output power	120 W; observe the input-voltage and temperature derating limits.
Input voltage range	90–305 V AC or 127–431 V DC; apply the static-characteristic derating curve.
Input frequency	47–63 Hz.
Efficiency	88.5% typical for this model.
Series efficiency reference	The PWM-120-KN series description states efficiency up to 90%; use this model's typical efficiency and operating conditions above.
Power factor	>0.97 at 115 V AC, >0.96 at 230 V AC and >0.94 at 277 V AC typical, at full load.
Total harmonic distortion	THD <20% at load ≥60% with 115 or 230 V AC, and at load ≥75% with 277 V AC.
AC input current	1.3 A at 115 V AC, 0.65 A at 230 V AC and 0.55 A at 277 V AC typical.
Inrush current	Cold start: 60 A typical at 230 V AC; pulse width 520 µs measured at 50% of Ipeak, per NEMA 410.
Leakage current	<0.25 mA at 277 V AC.
Standby power consumption	<0.5 W.
Setup and rise time	500 ms setup and 80 ms rise at 115 or 230 V AC. Setup time is measured at the first cold start; repeated ON/OFF operation may increase it.
Hold-up time	16 ms typical at 115 or 230 V AC.
Circuit-breaker loading	At 230 V AC, maximum 4 units on a 16 A type B breaker or 6 units on a 16 A type C breaker.
General test conditions	Unless otherwise stated, parameters are measured at 230 V AC input, rated current and +25°C ambient temperature.

KNX control and PWM dimming

Ordered configuration	KN: standard KNX control configuration. The catalog identifies KN as the standard stocked type; actual availability follows the order.
Dimming range	0–100%; minimum dimming level 0.01% as stated in the features.
Output PWM frequency	200–4000 Hz typical, user changeable via ETS; up to 4 kHz output dimming frequency.
PWM dimming principle	Brightness is controlled by varying the output-current duty cycle: duty cycle (%) = TON / T × 100%. The constant-voltage PWM output supports color-temperature retention and brightness uniformity with compatible LED strips or constant-voltage LED bulbs. The waveform shows the off interval at Io = 0 A.
Flicker-design reference	The catalog states design compliance with the IEEE 1789-2015 no-risk requirement and the EU Ecodesign stroboscopic visibility measure (SVM) requirement. The 0.01% minimum dimming level supports low-light applications such as cinemas.
KNX interface	Certified KNX protocol; apply the bus signal between KNX+ and KNX−. A KNX–DALI gateway is not required.
KNX polarity and separation	KNX+ is red and KNX− is black. Do not connect KNX− to the negative LED output (Vo− / −V). Keep the separate bus and LED-output pairs correctly identified.
ETS application and programming	The application database is available through ETS Online Catalogs or MEAN WELL's product catalog. The mechanical drawing locates the KNX programming button and LED.
Programming without AC mains	This series can be addressed/programmed in ETS without connecting AC mains, as stated on its installation page. The KNX bus connection is still required.
Internal oscillator distinction	The block diagram identifies PFC fosc 50–120 kHz and internal PWM fosc 60–130 kHz. These internal switching frequencies are separate from the 200–4000 Hz output dimming frequency.

Protection and operating limits

Overload protection	108–130% of rated output power; hiccup mode, with automatic recovery after the fault is removed.
Short-circuit protection	Output voltage shuts down; cycle power to recover.
Overvoltage protection	15–17 V; output voltage shuts down. Cycle power to recover.
Overtemperature protection	Output voltage shuts down; cycle power to recover.
Case-temperature operating range	Tcase −40 to +90°C; maximum case temperature +90°C. Follow the output-load curves and measure at the specified tc point.
Ambient-temperature load curve	Horizontal mounting: the 12 V model carries 100% load through +40°C ambient, decreasing to 40% at +70°C. The −40 to −25°C region is marked for 230 V AC input only. Apply input-voltage and case-temperature limits at the same time.
Case-temperature load curve	The horizontal-mounting curve shows 100% load up to Tcase +90°C; the cold region below −25°C is restricted to 230 V AC input. This does not replace the ambient-temperature derating curve.
Low-input load curve	At 60 Hz: 80% load at 90 V AC, reaching 100% at 100 V AC and remaining at 100% through 305 V AC.
Working humidity	20–95% RH, non-condensing.
Storage conditions	−40 to +80°C; 10–95% RH.
Temperature coefficient	±0.03%/°C over 0–40°C.
Vibration	10–500 Hz, 5 G; 12 minutes per cycle, 72 minutes each along the X, Y and Z axes.
Altitude derating	For this fanless model, reduce the allowed ambient temperature by 3.5°C per 1000 m above 2000 m altitude.
Performance-curve conditions	The PF curve is referenced to Tcase +80°C. The THD and efficiency curves use the 24 V model at that case temperature, with 115/230/277 V AC curves; they are reference curves, not additional ratings for every model.
Typical lifetime	Typical life expectancy >50,000 hours when Tcase at the tc point (or TMP per DLC) is about +75°C or less. The lifetime graph shows decreasing expected life as case temperature rises; lifetime is not a warranty duration.
Reliability	MTBF minimum 1915.2k hours by Telcordia SR-332 (Bellcore); minimum 205.8k hours by MIL-HDBK-217F at +25°C.
Manufacturer warranty	5 years; refer to the manufacturer's applicable warranty statement.

Mechanical layout and connections

Dimensions	191 × 63 × 37.5 mm (L × W × H); mechanical drawing general tolerance ±1 mm.
Case and construction	Case No. PWM-120-KN; plastic housing, Class II design, fanless cooling by free-air convection.
Mounting drawing	Two Ø4.5 mm mounting positions at opposite corners; the drawing marks 5 mm offsets in both directions at the mounting corners. The side view also marks a 3 mm local feature at the cable-entry end.
Recommended mounting orientation	Horizontal on the mounting surface as shown in the installation drawing. Other orientations or high ambient temperature can increase internal temperature and require output-current derating.
Case-temperature measurement point	The tc point is at the center of the top view: 95.5 mm from the right end and 31.5 mm above the lower edge; these are position dimensions.
AC input cable	SJTW 18 AWG × 2C, 300 ±20 mm: AC/L brown and AC/N blue. The end-detail drawing marks a 50 ±3 mm lead section.
DC output cable	SJOW 17 AWG × 2C, 300 ±10 mm: +V red and −V black. The end-detail drawing marks a 50 ±3 mm lead section.
KNX bus cable	UL2464 20 AWG × 2C, 350 ±10 mm: KNX+ red and KNX− black.
KNX connector and configuration	A KNX connector is stated to be included in the box. Match the supplied connector and ordered KN configuration to the connection drawing.
Catalog unit packing reference	0.80 kg per unit in the PACKING row (800 g); this is a catalog packing reference, not a separately measured net weight.
Carton packing reference	15 pieces / 13.0 kg / 0.87 CUFT.

Safety and installation

Power-unit classification	Class II plastic-housed driver; SELV is marked in the catalog.
Safety standards	ENEC BS EN/EN 61347-1, BS EN/EN 61347-2-13 and BS EN/EN 62384 independent; GB/T 19510.1 and GB/T 19510.213; EAC TP TC 004 approved.
BIS model scope	BIS IS 15885 (Part 2/Sec 13) is listed for this model.
Withstand voltage	Input to output: 3.75 kV AC.
Isolation resistance	Input to output: 100 MΩ at 500 V DC, +25°C and 70% RH.
EMC emission	Compliance with BS EN/EN 55015; BS EN/EN 61000-3-2 Class C at load ≥60%; BS EN/EN 61000-3-3; GB/T 17743; GB 17625.1; EAC TP TC 020.
EMC immunity	BS EN/EN 61000-4-2, -3, -4, -5, -6, -8 and -11; BS EN/EN 61547, light-industry level; line-to-line surge immunity 2 kV; EAC TP TC 020.
Load applications	LED strips and constant-voltage LED bulbs for indoor, decorative and architectural lighting; low-level dimming applications include cinemas.
Installation isolation and ventilation	Disconnect utility power before installation or maintenance and prevent accidental reconnection. Keep ventilation clear and do not stack objects on the unit; maintain 10–15 cm clearance when the adjacent device is a heat source.
Cable and thermal checks	Use approved primary and secondary cables with current ratings at least equal to the unit's applicable current. Keep the measured tc point within the product-label limit.
Complete-system EMC	The driver is a component for installation with final equipment. The final-equipment manufacturer must requalify EMC performance for the complete installation.

Installation and KNX commissioning guidance

Installation and service precautions	Use qualified personnel for fault examination; do not open the case yourself. Provide system-level insulation at interconnections and enclose single-insulated wiring. Check the strength of the mounting structure; use safety cables for bay-light applications. Do not immerse the unit in water. A damaged flexible cable must be replaced by the manufacturer, its service agent or a similarly qualified person.
KNX commissioning	Select the matching MEAN WELL LED-driver application in ETS. Connect the bus interface and bus supply, press the programming button so its red LED lights, then download the physical address; the LED goes out when the address is loaded. Download the application and parameters, then test operation. Use the ETS Online Catalog and application data matched to the supplied model and firmware.
KNX bus planning	The user manual lists a maximum of 256 devices, 350 m from the KNX supply to the furthest device, 700 m between two devices and 1000 m total cable on one line. These are KNX-bus planning limits, not AC-input or LED-output lead-length ratings. Follow the supplied connector version and keep KNX negative separate from output negative.
Switching, scenes and blocking	ETS provides switching, relative and absolute dimming, status feedback, selectable dimming curves, automatic functions and eight assignable scenes per channel from 64 scene numbers. Scene operation is disabled in staircase mode. Staircase lighting turns off after its configured duration, with optional pre-warning or permanent-ON override. Blocking priority is Block I, then Block II, then Permanent ON, then switching/dimming; commands are ignored while blocked. The DALI curve option is a curve selection, not a DALI bus interface.
Operating hours and constant light output	Operating hours are saved to flash every 10 minutes; a bus-power failure can lose the unsaved interval. Constant Light Output adjusts brightness from the configured LED ageing curve: PWM-60/120 use entered curve values, while PWM-200 also offers L70/L80/L90 presets that can be adjusted. This compensates LED lumen depreciation and is not a driver-life guarantee.
Temperature and power feedback	Ambient-temperature feedback is calculated as internal temperature minus a correction factor; it is not a separate ambient-sensor measurement. Configurable temperature alarms and shutdown use the selected thresholds and reset mode. Power feedback is calculated from configured actual LED-load watts multiplied by dimming level, optionally including CLO; it is not measured AC input power. The manual's 1–200 W configuration range does not increase this model's rated output. Configurable lamp-failure reports can detect output short circuit, open circuit or either condition; 1 indicates an alarm and 0 no detected alarm.
Manual version and parameter limits	The linked dedicated manual is August 2021 Version 2. Its older parameter pages include 0.5–100% brightness settings; use the matching ETS database and the 2026-02-04 model datasheet for the current 0.01% minimum-brightness specification. Do not treat an old parameter default as a guaranteed setting of the supplied unit.
End-system EMC verification	This is a component power supply. Verify EMC in the completed system with the actual load, wiring and installation layout; component test results do not establish compliance of every finished installation. The EMI guidance's laboratory arrangement is a test example, not a product mounting-clearance specification.