Mean Well HLG-40H-42AB Power Supply 40W 42V - Adjustable and Dimmable

Name: Mean Well HLG-40H-42AB Power Supply 40W 42V - Adjustable and Dimmable 960mA
Brand: Mean Well
SKU: HLG-40H-42AB
Price: 40.34 USD
Availability: InStock

Overview

HLG-40H-42AB is the 42V output model of this series: rated current 0.96A, rated power 40.32W, typical efficiency 88.5%.

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 IP67/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
IP67 / IP65 rating for indoor or outdoor installations
Function options: output adjustable via potentiometer; 3 in 1 dimming; Timer dimming
Typical lifetime > 62000 hours
7 years warranty

Specifications

HLG-40H-42ABSpecifications 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 (except for AB-type), IP65 or IP67 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

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-42AB BLOCK DIAGRAM — BLOCK DIAGRAM

HLG-40H-42AB DIMMING OPERATION — DIMMING OPERATION

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

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

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

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

HLG-40H-42AB MECHANICAL SPECIFICATION — MECHANICAL SPECIFICATION

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

HLG-40H-42AB H L G - 4 0 H series — H L G - 4 0 H series

HLG-40H-42AB H L G - 4 0 H series (2) — H L G - 4 0 H series (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

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 the HLG-40H-42AB dim 42V LED strips via a building automation system?

Yes. The HLG-40H-42AB accepts 1-10V and PWM dimming signals, making it compatible with most building automation and smart-lighting controllers. At 40W and 42V output, it can drive a small run of 42V LED strips with smooth brightness adjustment.

Is the HLG-40H-42AB a good choice for adjustable, dimmable 42V LED accent lighting?

Yes. It combines a built-in potentiometer for voltage/current trimming with a 1-10V/PWM dimming input, giving you both set-and-forget calibration and dynamic brightness control. The 40W capacity suits small accent-lighting installations such as cove lighting or display shelves.

Can I use the HLG-40H-42AB for a small dimmable 42V LED sign?

Yes. The 42V output at up to 0.96A matches standard 42V sign modules, and the dimming input allows day/night brightness scheduling. The adjustable output lets you fine-tune voltage to the exact module string, and the wide 90-305VAC input handles most commercial mains supplies.

How many meters of 42V LED strip can the HLG-40H-42AB drive?

That depends on the strip's wattage per meter. The HLG-40H-42AB delivers up to 40W at 42V. A strip rated at 8W/m could run up to 5 meters (40W / 8W per meter = 5m). Always check your strip's rated power per meter and keep combined load at or below 40W.

Can the HLG-40H-42AB be used in a semi-exposed outdoor environment?

Yes. Its IP65 rating protects against dust ingress and water jets from any direction, suitable for covered outdoor areas, soffits, and ventilated enclosures. For installations fully exposed to rain or standing water, consider the IP67-rated HLG-40H-42B instead.

What are the differences between the HLG-40H-42, 42A, 42AB, and 42B variants?

All four share the same 40W / 42V / 0.96A core specs. The base HLG-40H-42 has no adjustment or dimming and is IP67 waterproof. The -42A adds a potentiometer for output adjustment (IP65). The -42AB adds both adjustment and 1-10V/PWM dimming (IP65). The -42B adds dimming input only and retains IP67.

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Mean Well HLG-40H-42AB Power Supply 40W 42V - Adjustable and Dimmable 960mA

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