Mean Well HLG-40H-42A Power Supply 40W 42V

Name: Mean Well HLG-40H-42A Power Supply 40W 42V - Adjustable 960mA
Brand: Mean Well
SKU: HLG-40H-42A
Price: 34.36 USD
Availability: InStock
Rating: 5.0 (4 reviews)

Overview

HLG-40H-42A is the 42V output model of this series: rated current 0.96A, rated power 40.32W, typical efficiency 88.5%. Type A: Io and Vo adjustable through built-in potentiometer (IP65).

HLG-40H series is a 40W AC/DC LED driver featuring the dual mode constant voltage and constant current output. HLG-40H operates from 90～305VAC and offers models with different rated voltage ranging between 12V and 54V. Thanks to the high efficiency up to 89.5%, with the fanless design, the entire series is able to operate for -40 ~ +80 case temperature under free air convection. The design of metal housing and IP65 ingress protection level allows this series to fit both indoor and outdoor applications. HLG-40H is equipped with various function options, such as dimming methodologies, so as to provide the optimal design flexibility for LED lighting system.

Features

Constant Voltage + Constant Current mode output
Metal housing with class I design
Built-in active PFC function
Class 2 power unit
IP65 rating for indoor or outdoor installations
Function options: output adjustable via potentiometer
Typical lifetime > 62000 hours
7 years warranty

Specifications

HLG-40H-42ASpecifications from the official datasheet (2026-02-04 edition)

OUTPUT

DC VOLTAGE: 42V
CONSTANT CURRENT REGION^Note.4: 25.2 ~ 42V
RATED CURRENT: 0.96A
RATED POWER: 40.32W
RIPPLE & NOISE (max.)^Note.2: 200mVp-p
VOLTAGE ADJ. RANGE: Adjustable for A/AB-Type only (via built-in potentiometer)
VOLTAGE ADJ. RANGE: 40 ~ 46V
CURRENT ADJ. RANGE: Adjustable for A/AB-Type only (via built-in potentiometer)
CURRENT ADJ. RANGE: 0.58 ~ 0.96A
VOLTAGE TOLERANCE^Note.3: ±1.0%
LINE REGULATION: ±0.5%
LOAD REGULATION: ±0.5%
SETUP, RISE TIME^Note.6: 500ms,80ms/115VAC 500ms,80ms/230VAC
HOLD UP TIME (Typ.): 16ms / 115VAC, 230VAC

INPUT

VOLTAGE RANGE^Note.5: 90 ~ 305VAC 127 ~ 431VDC (Please refer to "STATIC CHARACTERISTIC" section)
FREQUENCY RANGE: 47 ~ 63Hz
POWER FACTOR (Typ.): PF≧0.98/115VAC, PF≧0.95/230VAC, PF≧0.92/277VAC @ full load (Please refer to "POWER FACTOR (PF) CHARACTERISTIC" section)
TOTAL HARMONIC DISTORTION: THD< 20% (@ load≧60% / 115VAC,230VAC; @ load≧75% / 277VAC) (Please refer to "TOTAL HARMONIC DISTORTION (THD)" section)
EFFICIENCY (Typ.): 88.5%
AC CURRENT (Typ.): 0.43A / 115VAC 0.24A / 230VAC 0.23A / 277VAC
INRUSH CURRENT(Typ.): COLD START 50A(twidth=210μs measured at 50% Ipeak) at 230VAC; Per NEMA 410
MAX. No. of PSUs on 16A CIRCUIT BREAKER: 12 units (circuit breaker of type B) / 20 units (circuit breaker of type C) at 230VAC
LEAKAGE CURRENT: <0.75mA / 277VAC

PROTECTION

OVER CURRENT: 95 ~ 108% Constant current limiting, recovers automatically after fault condition is removed
SHORT CIRCUIT: Hiccup mode, recovers automatically after fault condition is removed
OVER VOLTAGE: 48 ~ 58V
OVER TEMPERATURE: Shut down o/p voltage, re-power on to recover

ENVIRONMENT

WORKING TEMP.: Tcase= -40 ~ +80℃ (Please refer to "OUTPUT LOAD vs TEMPERATURE" section)
MAX. CASE TEMP.: Tcase= +80℃
WORKING HUMIDITY: 20 ~ 95% RH non-condensing
STORAGE TEMP., HUMIDITY: -40 ~ +80℃, 10 ~ 95% RH
TEMP. COEFFICIENT: ±0.03%/℃ (0 ~ 60℃)
VIBRATION: 10 ~ 500Hz, 5G 12min./1cycle, period for 72min. each along X, Y, Z axes

SAFETY & EMC

SAFETY STANDARDS^Note.8: UL8750(type”HL”), CSA C22.2 No. 250.0-08 , BS EN/EN/AS/NZS 61347-1,BS EN/EN/AS/NZS 61347-2-13 independent , GB/T19510.1,GB/T19510.213,EAC TP TC 004,KC61347-1,KC61347-2-13, IP65 approved ; J61347-1 , J61347-2-13 ; design refer to BS EN/EN60335-1(by request)
WITHSTAND VOLTAGE: I/P-O/P:3.75KVAC I/P-FG:2KVAC O/P-FG:1.5KVAC
ISOLATION RESISTANCE: I/P-O/P, I/P-FG, O/P-FG:100M Ohms / 500VDC / 25℃/ 70% RH
EMC EMISSION^Note.8: Compliance to BS EN/EN55015, BS EN/EN61000-3-2 Class C (@ load≧60%) ; BS EN/EN61000-3-3,GB/T 17743 , GB17625.1, KS C 9815, KS C 9547, EAC TP TC 020
EMC IMMUNITY: Compliance to BS EN/EN61000-4-2,3,4,5,6,8,11; BS EN/EN61547, BS EN/EN55024, light industry level (surge immunity Line-Earth 4KV, Line-Line 2KV), KS C 9815, KS C 9547, EAC TP TC 020

OTHERS

MTBF: 3395.8K hrs min. Telcordia SR-332 (Bellcore) ; 345.8K hrs min. MIL-HDBK-217F (25℃)
DIMENSION: 171*61.5*36.8mm (L*W*H)
PACKING: 0.73Kg; 20pcs/15.6Kg/0.9CUFT

Certifications & ratings

Type: HL

MODEL ENCODING

Blank: Io and Vo fixed; IP67
A (this model): Io and Vo adjustable through built-in potentiometer; IP65
B: 3 in 1 dimming function (1~10VDC, 10V PWM signal and resistance); IP67
AB: Io and Vo adjustable through built-in potentiometer & 3 in 1 dimming function (1~10Vdc, 10V PWM signal and resistance); IP65
D: Timer dimming function, contact MEAN WELL for details(safety pending); IP67

Test conditions and notes14

1. All parameters NOT specially mentioned are measured at 230VAC input, rated current and 25℃ of ambient temperature.
2. Ripple & noise are measured at 20MHz of bandwidth by using a 12" twisted pair-wire terminated with a 0.1uf & 47uf parallel capacitor.
3. Tolerance : includes set up tolerance, line regulation and load regulation.
4. Please refer to "DRIVING METHODS OF LED MODULE".
5. De-rating may be needed under low input voltages. Please refer to “STATIC CHARACTERISTIC” sections for details.
6. Length of set up time is measured at first cold start. Turning ON/OFF the driver may lead to increase of the set up time.
7. The driver is considered as a component that will be operated in combination with final equipment. Since EMC performance will be affected by the complete installation, the final equipment manufacturers must re-qualify EMC Directive on the complete installation again. (as available on https://www.meanwell.com//Upload/PDF/EMI_statement_en.pdf)
8. To fulfill requirements of the latest ErP regulation for lighting fixtures, this LED driver can only be used behind a switch without permanently connected to the mains.
9. This series meets the typical life expectancy of >62,000 hours of operation when Tcase, particularly tc point (or TMP, per DLC), is about 75℃ or less.
10. Please refer to the warranty statement on MEAN WELL's website at http://www.meanwell.com.
11. The ambient temperature derating of 3.5℃/1000m with fanless models and of 5℃/1000m with fan models for operating altitude higher than 2000m(6500ft).
12. For any application note and IP water proof function installation caution, please refer our user manual before using. https://www.meanwell.com/Upload/PDF/LED_EN.pdf
13. For A/AB type need to consider build in using to comply with Type HL application.
14. Products sourced from the Americas regions may only have the UL, CE and UKCA logos. Please contact your MEAN WELL sales for more information.

Technical drawings

HLG-40H-42A BLOCK DIAGRAM — BLOCK DIAGRAM

HLG-40H-42A Illustration (page 5) — Illustration (page 5)

HLG-40H-42A OUTPUT LOAD vs TEMPERATURE(Note.10) — OUTPUT LOAD vs TEMPERATURE(Note.10)

HLG-40H-42A STATIC CHARACTERISTICS — STATIC CHARACTERISTICS

HLG-40H-42A TOTAL HARMONIC DISTORTION — TOTAL HARMONIC DISTORTION

HLG-40H-42A MECHANICAL SPECIFICATION ※A-Type — MECHANICAL SPECIFICATION ※A-Type

HLG-40H-42A ‧tc : Max. Case Temperature — ‧tc : Max. Case Temperature

HLG-40H-42A WATERPROOF CONNECTION — WATERPROOF CONNECTION

HLG-40H-42A WATERPROOF CONNECTION (2) — WATERPROOF CONNECTION (2)

Typical applications

LED street lighting
LED high-bay lighting
Parking space lighting
LED fishing lamp
LED greenhouse lighting
Type “HL” for use in ClassⅠ, Division 2 hazardous (Classified) location.

Downloads

Datasheet1

HLG-40H-42A datasheetHLG-40H-SPEC.PDF · 2026-02-04 edition PDF Download

Certificates5

TUV Certificate (HLG-40H)(EN) PDF Download

UL Certificate(HLG-40H)(EN) PDF Download

CB Certificate(HLG-40H)(EN) PDF Download

EMC Certificate(HLG-40H)(EN) PDF Download

PSE Certificate(HLG-40H)(EN) PDF Download

Test reports1

Test Report(HLG-40H-42)(EN) PDF Download

Catalogues1

Mean Well LED Driver Catalog PDF Download

FAQ

Can I use the HLG-40H-42A for adjustable 42V LED strip lighting?

Yes. The HLG-40H-42A outputs 42V at up to 0.96A (40W) and includes a built-in potentiometer for trimming the output voltage and current. This is useful when you need to lower brightness slightly or match the driver output precisely to a specific 42V LED strip load.

Is the HLG-40H-42A suitable for fine-tuning 42V LED fixture brightness in a retail space?

Yes. The adjustable output lets you dial in the exact voltage and current for your 42V LED fixtures without needing an external dimmer. At 40W capacity, it handles small fixture runs typical of display-case or shelf lighting in retail environments.

Can the HLG-40H-42A power 42V LED modules for compact signage?

Yes, as long as total module power stays within 40W. The adjustable output is helpful for matching voltage precisely to your module string. The wide 90-305VAC input handles varying commercial mains voltages, and the constant-current mode with a 25.2-42V CC range provides stable drive.

How many meters of 42V LED strip can the HLG-40H-42A power?

It depends on the strip's power draw per meter. The HLG-40H-42A provides up to 40W at 42V. For example, a strip drawing 10W/m could run up to 4 meters (40W / 10W per meter = 4m). Check your strip's rated power per meter and keep the total under 40W.

Is the HLG-40H-42A suitable for a covered outdoor patio or awning installation?

Yes. Its IP65 water-resistant rating protects against dust and low-pressure water jets, which covers sheltered outdoor environments like patios, awnings, and ventilated enclosures. For fully exposed rain installations, the IP67-rated HLG-40H-42 or HLG-40H-42B would be more appropriate.

Payment & Security

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Model	Power	Voltage	Current	IP Rating	Price
Mean Well HLG-40H-12B Power Supply 40W 12V - Dimmable 3.33A	39.96W	12V	3.33A	IP67	$32.24	View
Mean Well HLG-40H-24B Power Supply 40W 24V - Dimmable 1.67A	40.08W	24V	1.67A	IP67	$33.90	View
Mean Well HLG-40H-42B Power Supply 40W 42V - Dimmable 960mA	40.32W	42V	0.96A	IP67	$35.33	View
Mean Well HLG-40H-24A Power Supply 40W 24V - Adjustable 1.67A	40.08W	24V	1.67A	IP65	$37.32	View
Mean Well HLG-40H-15B Power Supply 40W 15V - Dimmable 2.67A	40.05W	15V	2.67A	IP67	$35.33	View
Mean Well HLG-40H-12 Power Supply 40W 12V 3.33A	39.96W	12V	3.33A	IP67	$37.32	View

Customer reviews

5.0 Reviews verified for authenticity

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Reviewed by 4 customers across the HLG series

By Penny C.|2026-10-03✓ Verified Buyer
Model: HLG-480H-24AQuantity: 2
It is a beast!
By T-Rids |2026-09-14✓ Verified Buyer
Model: HLG-480H-24BQuantity: 1
Very good product
By Maxim|2026-08-25✓ Verified Buyer
Model: HLG-320H-24B ×1, HLG-320H-24B ×1Quantity: 1
Excellent product!
By J. Vega|2026-07-20✓ Verified Buyer
Model: HLG-185H-30Quantity: 1
Exactly what I needed to revive my dead Maytronics Dolphin power supply!

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Mean Well HLG-40H-42A Power Supply 40W 42V - Adjustable 960mA

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