Name: MEAN WELL HLN-40H series: Single-output LED switching power supply - HLN-40H-42B
Brand: MEAN WELL
SKU: HLN-40H-42B
Price: 101.53 USD
Availability: InStock

MEAN WELL HLN-40H series: Single-output LED switching power supply - HLN-40H-42B

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Description

HLN-40H-42B — Single-output LED switching power supply

MEAN WELL HLN-40H-42B is an IP64 single-output LED switching power supply rated at 42 V DC, 0.96 A and 40.3 W. Its constant-voltage and constant-current characteristics, active PFC and free-air convection cooling support LED lighting, industrial lighting and moving signs. This B version provides 3-in-1 external current dimming.

Download MEAN WELL HLN-40H Datasheet (PDF)
Download MEAN WELL LED Installation Manual (PDF)
Download MEAN WELL EMI Testing Guidance (PDF)

HLN-40H series: datasheet PDF pages 1–5, specification edition 2026-02-09.

Output specifications

Model and version	HLN-40H-42B; HLN-40H series, B type.
Rated output	42 V DC; 0.96 A rated current; 40.3 W rated power. Observe all three model-specific limits.
Output load range	0–0.96 A in the constant-voltage operating region; this load range is separate from the constant-current setting and dimming range.
Constant-current region	25.2–42 V DC. The typical I–V diagram shows constant-current operation down to 60% of rated voltage and hiccup protection below this region. The highest output voltage in CC operation depends on the end-system configuration; contact MEAN WELL if compatibility is uncertain.
Voltage tolerance	±1%, including setup tolerance, line regulation and load regulation.
Line and load regulation	Line: ±0.5%; load: ±0.5%.
Ripple and noise	300 mVp-p maximum; measured at 20 MHz bandwidth with a 12-inch twisted-pair wire terminated by 0.1 µF and 47 µF capacitors in parallel.

Adjustment and LED connection

Dimming interface	B type only: apply a resistance, 1–10 V DC or a 10 V PWM signal between DIM+ and DIM− to adjust the constant-current level. DIM+ is purple and DIM− is pink. Do not connect DIM− to the negative power output (−V).
Resistance dimming	Typical reference: 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100 kΩ correspond respectively to 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100% of rated current for one driver. For N drivers in synchronized dimming operation, use the corresponding resistance divided by N (10 kΩ/N through 100 kΩ/N).
Voltage dimming	Typical reference: 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10 V DC correspond respectively to 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100% of rated current.
PWM dimming	10 V PWM signal, 100 Hz–3 kHz. Typical reference: duty cycles of 10, 20, 30, 40, 50, 60, 70, 80, 90 and 100% correspond respectively to the same percentages of rated current.
Open dimming circuit	The typical tables specify 95–108% of rated current with the dimming input open. They do not specify a guaranteed zero-current setting.
Full-off switching	Built-in B-type dimming cannot turn the lighting fixture completely dark. Use the external switch-and-relay connection shown in the catalog to turn the fixture ON/OFF and achieve 0% brightness. Dimming remains connected across DIM+ and DIM−; the relay switches the supply as shown.
B-type LED connection	For the illustrated B-type dimming application, connect directly to LEDs; the catalog states that using additional drivers is not suitable. Do not treat the separate generic CV illustration as approval for an added driver in this dimming circuit.

Input and operating performance

Input voltage and frequency	90–305 V AC or 127–431 V DC; AC frequency 47–63 Hz. Observe low-input derating.
Power factor	Built-in active PFC. Typical: >0.98 at 115 V AC, >0.95 at 230 V AC and >0.92 at 277 V AC, at full load.
Total harmonic distortion	<20% with output loading ≥60% at 115/230 V AC input, or ≥75% at 277 V AC input.
Efficiency	88.5% typical under the standard specification conditions.
AC input current	Typical: 0.43 A at 115 V AC, 0.24 A at 230 V AC and 0.23 A at 277 V AC.
Inrush current	50 A typical at cold start with 230 V AC input; pulse width 210 µs measured at 50% of peak current.
Leakage current	<0.75 mA at 277 V AC.
Setup and rise time	Setup 500 ms; rise 80 ms, at full load with 115 or 230 V AC input. Setup is measured at the first cold start; repeated power ON/OFF may increase setup time.
Hold-up time	16 ms typical at full load, with either 115 or 230 V AC input.
Switching frequency	100 kHz, as shown in the block diagram.

Protection functions

Overcurrent protection	95–108%; constant-current limiting with automatic recovery after the fault condition is removed.
Short-circuit protection	Hiccup mode; automatic recovery after the fault condition is removed.
Overvoltage protection	48–58 V; output voltage shuts down. Reapply power to recover.
Overtemperature protection	Output voltage shuts down. Reapply power to recover.

Environment and derating

Operating temperature and derating	−40 to +50°C ambient, subject to derating. The horizontal-installation curve shows full load through +40°C, then approximately 60% load at +50°C. The −40 to −25°C portion is specified for 230 V AC input only. Cooling is by free-air convection.
Low-input derating	The 60 Hz static-characteristics curve shows approximately 80% load at 90 V AC, rising to 100% at 100 V AC and remaining at 100% through 305 V AC.
High-altitude derating	For this fanless supply, reduce the permitted ambient temperature by 3.5°C per 1000 m above 2000 m (6500 ft).
Humidity and storage	Operating: 20–95% RH, non-condensing. Storage: −40 to +80°C and 10–95% RH.
Temperature coefficient	±0.03%/°C over 0–40°C.
Vibration	10–500 Hz, 2 G; 12 minutes per cycle, 72 minutes each along X, Y and Z.
Performance curves	The power-factor curve is for constant-current mode and is labeled 40 W. Efficiency-versus-load curves are for the 48 V model at 115/230/277 V AC; use this model’s own typical efficiency rating rather than assigning the 48 V graph to every output variant.

Safety and application requirements

Housing and power classification	Fully isolated plastic case, IP64; Class 2 power unit and SELV marking. Suitable for dry or damp locations and outdoor applications when correctly installed. Use the fitted green/yellow FG connection.
Safety approvals	UL8750; CSA C22.2 No. 250.0-08; BS EN/EN61347-1; BS EN/EN61347-2-13 (independent); IP64; EAC TP TC 004 approved.
Design-reference standards	Design references: UL60950-1 and BS EN/EN60335-1.
EMC emission	BS EN/EN55015; BS EN/EN61000-3-2 Class C (≥60% load); BS EN/EN61000-3-3; EAC TP TC 020.
EMC immunity	BS EN/EN61000-4-2, -3, -4, -5, -6, -8 and -11; BS EN/EN61547; BS EN/EN55024, light-industry level (4 kV surge); EAC TP TC 020.
Withstand voltage	Input–output: 3.75 kV AC; input–FG: 2 kV AC; output–FG: 0.5 kV AC.
Isolation resistance	100 MΩ between input–output, input–FG and output–FG, measured at 500 V DC, 25°C and 70% RH.
Application and mains switching	For ErP lighting-fixture requirements, use the supply behind a switch; do not permanently connect it to the mains. This product is not suitable for LED lighting applications in China. Follow the installation manual for application and IP water-protection precautions.

Mechanical and wiring details

Dimensions and case	161 × 61.5 × 35 mm (L × W × H); drawing tolerance ±1 mm; case No. HLN-60A.
Mounting and temperature point	Two R2.5 mounting slots; the drawing gives 6.26 mm end offsets and 21.25 mm transverse offsets. The Tcase measurement point is 35 mm from the output-end case edge and 20 mm from the upper long edge. The drawing labels the measurement point but gives no numerical maximum case-temperature limit.
Input wiring	SVT 18 AWG × 3C, 300 ±20 mm: brown AC/L, blue AC/N, green/yellow FG.
Output wiring	Style 2464 18 AWG × 4C, 300 ±20 mm: red +V, black −V, purple DIM+, pink DIM−.
Unit packing reference	350 g, from the catalog per-unit packing reference, not an independently measured net weight. 0.35 kg per unit; 32 pieces / 12.2 kg / 1.10 CUFT per carton.
Reliability	MTBF minimum 3396.4 thousand hours by Telcordia SR-332 (Bellcore), and minimum 346.2 thousand hours by MIL-HDBK-217F at 25°C. The manufacturer’s catalog states a 3-year warranty.
Specification conditions	Unless otherwise stated, values are measured at 230 V AC input, rated load and 25°C ambient. System performance remains subject to the specified thermal, loading and installation conditions.

Installation guidance

Installation isolation and service	Disconnect the supply from the mains before installation or maintenance and prevent unintended reconnection. Have faults checked by a qualified technician; do not open the case. A damaged flexible cable must be replaced by the manufacturer, its service agent or a similarly qualified person.
Ventilation, mounting and weather protection	Keep ventilation clear and do not stack objects on the unit. Maintain 10–15 cm clearance when an adjacent device is a heat source. Follow this HLN model’s mounting and derating diagrams. Locate the IP64 unit indoors or sheltered from rain outdoors; do not immerse it in water. Check that the mounting surface and luminaire structure can support the installation, and use safety cables for bay lighting applications.
Wiring and system enclosure	Use approved input and output wiring with current ratings at least equal to the applicable unit current. Connect the fitted green/yellow FG lead to PE. Provide insulation around system interconnections and cover single-insulated wiring with the system enclosure; keep output current and power within the model ratings and derating limits.
EMC integration	Reverify EMC in the finished equipment with the connected load and actual wiring and assembly. The linked EMI guidance describes representative component-power-supply tests; its illustrated distances are test arrangements, not installation clearances.
Circuit-breaker reference	At 230 V AC, the installation manual gives calculated maximum quantities for HLN-40H with ABB S200-series breakers: B10 7, B16 12, C10 13, C16 20, D10 26 and D16 41. These counts apply to that stated breaker and voltage reference.
Dimming-controller compatibility	The HLN dimming circuit is not isolated from the secondary output. Use a controller compatible with this B version’s DIM interface and follow its model-specific dimming and switching diagrams.