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Mean Well HLG-120H-42AB Power Supply 120W 42V - Adjustable and Dimmable 2.9A

premium quality7 years warrantyaluminium casinghigh efficiency
SKU HLG-120H-42AB
$61.18 USD
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HLG-120H-42AB
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Overview

HLG-120H-42AB is the 42V output model of this series: rated current 2.9A, rated power 121.8W, typical efficiency 93%. Type AB: Io and Vo adjustable through built-in potentiometer & 3 in 1 dimming function (1~10Vdc, 10V PWM signal and resistance) (IP65).

HLG-120H series is a 120W AC/DC LED driver featuring the dual mode constant voltage and constant current output. HLG-120H operates from 90～305VAC and offers models with different rated voltage ranging between 12V and 54V. Thanks to the high efficiency up to 93.5%, 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-120H 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
  • IP65 rating for indoor or outdoor installations
  • Function options: output adjustable via potentiometer; 3 in 1 dimming
  • Typical lifetime > 62000 hours
  • 7 years warranty

Specifications

HLG-120H-42ABSpecifications from the official datasheet (2026-07-24 edition)Download datasheet PDF

OUTPUT

DC VOLTAGE
42V
CONSTANT CURRENT REGIONNote.4
21 ~ 42V
RATED CURRENT
2.9A
RATED POWER
121.8W
RIPPLE & NOISE (max.)Note.2
200mVp-p
VOLTAGE ADJ. RANGE
Adjustable for A/AB-Type only (via built-in potentiometer)
VOLTAGE ADJ. RANGE
38 ~ 46V
CURRENT ADJ. RANGE
Adjustable for A/AB-Type only (via built-in potentiometer)
CURRENT ADJ. RANGE
1.4 ~ 2.9A
VOLTAGE TOLERANCENote.3
±1.0%
LINE REGULATION
±0.5%
LOAD REGULATION
±0.5%
SETUP, RISE TIMENote.6
1200ms,50ms/115VAC 500ms,50ms/230VAC
HOLD UP TIME (Typ.)
12ms / 115VAC, 230VAC

INPUT

VOLTAGE RANGENote.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≧0.93/277VAC @ full load (Please refer to "POWER FACTOR (PF) CHARACTERISTIC" section)
TOTAL HARMONIC DISTORTION
THD< 20% (@ load≧50% / 115VAC,230VAC; @ load≧75% / 277VAC) (Please refer to " TOTAL HARMONIC DISTORTION (THD) " section)
EFFICIENCY (Typ.)
93%
AC CURRENT (Typ.)
1.4A / 115VAC 0.6A / 230VAC 0.55A / 277VAC
INRUSH CURRENT (Typ.)
COLD START 60A(twidth=375μs measured at 50% Ipeak) at 230VAC; Per NEMA 410
MAX. No. of PSUs on 16A CIRCUIT BREAKER
5 units (circuit breaker of type B) / 9 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
Constant current limiting, recovers automatically after fault condition is removed
OVER VOLTAGE
47 ~ 53V Shut down o/p voltage with auto-recovery or re-power on to recovery
OVER TEMPERATURENote.9
Shut down o/p voltage, recovers automatically after temperature goes down

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 STANDARDSNote.8
UL8750 (type”HL”) , CSA C22.2 No. 250.0-08, BS EN/EN 61347-1, BS EN/EN 61347-2-13, AS/NZS 61347-1, AS/NZS 61347-2-13 independent; GB/T19510.1,GB/T19510.213, IP65, J61347-1, J61347-2-13 ,BIS IS15885( for 12B,24B,36A,54A only), EAC TP TC 004 , KC61347-1,KC61347-2-13 approved
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 EMISSIONNote.8
Compliance to BS EN/EN55015, BS EN/EN55032 Class B, BS EN/EN61000-3-2 Class C (@ load≧50%) ; BS EN/EN61000-3-3, GB/T 17743 , GB17625.1, EAC TP TC 020, KSC 9815(except for D-type)
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),EAC TP TC 020, KSC 9547(except for D-type)

OTHERS

MTBF
2185.8K hrs min. Telcordia SR-332 (Bellcore); 167.1Khrs min. MIL-HDBK-217F (25℃)
DIMENSION
220*68*38.8mm (L*W*H)
PACKING
1.12Kg; 12pcs/14.4Kg/0.8CUFT

MODEL ENCODING

Blank
Io and Vo fixed; IP67
A
Io and Vo adjustable through built-in potentiometer; IP65
B
3 in 1 dimming function (1~10VDC, 10V PWM signal and resistance); IP67
AB (this model)
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 notes15
  1. 1. All parameters NOT specially mentioned are measured at 230VAC input, rated current and 25℃ of ambient temperature.
  2. 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. 3. Tolerance : includes set up tolerance, line regulation and load regulation.
  4. 4. Please refer to "DRIVING METHODS OF LED MODULE".
  5. 5. De-rating may be needed under low input voltages. Please refer to “STATIC CHARACTERISTIC” sections for details.
  6. 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. 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. 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. 9. For OTP which triggered at light load/no load condition, proceed AC repower on to recovery.
  10. 10. 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.
  11. 11. Please refer to the warranty statement on MEAN WELL's website at http://www.meanwell.com
  12. 12. 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).
  13. 13. 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
  14. 14. For A/AB type need to consider build in using to comply with Type HL application.
  15. 15. 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-120H-42AB BLOCK DIAGRAM
BLOCK DIAGRAM
HLG-120H-42AB DIMMING OPERATION
DIMMING OPERATION
HLG-120H-42AB Illustration (page 5)
Illustration (page 5)
HLG-120H-42AB STATIC CHARACTERISTICS
STATIC CHARACTERISTICS
HLG-120H-42AB TOTAL HARMONIC DISTORTION
TOTAL HARMONIC DISTORTION
HLG-120H-42AB ‧tc : Max. Case Temperature
‧tc : Max. Case Temperature
HLG-120H-42AB ※AB-Type
※AB-Type
HLG-120H-42AB Dimensions (mm)
Dimensions (mm)
HLG-120H-42AB WATERPROOF CONNECTION
WATERPROOF CONNECTION

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

FAQ

Can I pair with the HLG-120H-42AB to a building automation system for dimming 42V LED lights?

Yes. The HLG-120H-42AB accepts 1-10V or PWM dimming signals, so it works with building management systems and smart-lighting controllers that output these dimming signals. At 121.8W and 42V with adjustable output, it fits well into centrally controlled commercial lighting installations.

Is the HLG-120H-42AB a good choice for dimmable 42V LED cove or accent lighting indoors?

Yes. The combination of adjustable output (via potentiometer) and 1-10V/PWM dimming input gives you precise brightness control for architectural cove lighting, accent lighting, or display cases running on 42V LEDs. The 121.8W capacity supports medium-length lighting runs at 42V.

Can the HLG-120H-42AB power a dimmable 42V LED retail display lighting setup?

Yes. With 121.8W at 42V, dimming capability, and adjustable output, the HLG-120H-42AB lets you fine-tune brightness for retail displays, showcases, or merchandising illumination. The 90-305VAC input handles worldwide mains, and the IP65 rating suits indoor and sheltered commercial environments.

How many meters of 42V LED strip can the HLG-120H-42AB handle?

The HLG-120H-42AB provides up to 121.8W at 42V. For a strip rated at 14.4W/m, you could run approximately 8.5 meters (121.8W / 14.4W per meter). Always check your strip's rated power per meter and keep total load at or below 121.8W.

Can the HLG-120H-42AB be used in a dusty workshop or manufacturing floor?

Yes. The IP65 rating provides complete protection against dust ingress and low-pressure water jets. This makes it suitable for workshops and light manufacturing environments where airborne dust is present. For wet or fully exposed outdoor locations, choose an IP67-rated model instead.

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Other HLG-120H Models

2 other models
ModelPowerVoltageCurrentIP Rating
Mean Well HLG-120H-C350B Power Supply 150.5W 350mA - Dimmable 150.5W 430V 0.35A IP65 View
Mean Well HLG-120H-C350AB Power Supply 150.5W 350mA - Adjustable and Dimmable 150.5W 430V 0.35A IP65 View
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Mean Well HLG-120H-42AB Power Supply 120W 42V - Adjustable and Dimmable 2.9A
Mean Well

Mean Well HLG-120H-42AB Power Supply 120W 42V - Adjustable and Dimmable 2.9A

$61.18 USD

HLG-120H-42AB is the 42V output model of this series: rated current 2.9A, rated power 121.8W, typical efficiency 93%. Type AB: Io and Vo adjustable through built-in potentiometer & 3 in 1 dimming function (1~10Vdc, 10V PWM signal and resistance) (IP65).

HLG-120H series is a 120W AC/DC LED driver featuring the dual mode constant voltage and constant current output. HLG-120H operates from 90～305VAC and offers models with different rated voltage ranging between 12V and 54V. Thanks to the high efficiency up to 93.5%, 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-120H 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
  • IP65 rating for indoor or outdoor installations
  • Function options: output adjustable via potentiometer; 3 in 1 dimming
  • Typical lifetime > 62000 hours
  • 7 years warranty

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.

Model

  • 40W 42V
  • 40W 42V Adjustable
  • 40W 42V Adjustable and Dimmable
  • 40W 42V Dimmable
  • 60W 42V
  • 60W 42V Adjustable
  • 60W 42V Adjustable and Dimmable
  • 60W 42V Dimmable
  • 80W 42V
  • 80W 42V Adjustable
  • 80W 42V Adjustable and Dimmable
  • 80W 42V Dimmable
  • 100W 42V
  • 100W 42V Adjustable
  • 100W 42V Adjustable and Dimmable
  • 100W 42V Dimmable
  • 120W 42V
  • 120W 42V Adjustable
  • 120W 42V Adjustable and Dimmable
  • 120W 42V Dimmable
  • 150W 42V
  • 150W 42V Adjustable
  • 150W 42V Adjustable and Dimmable
  • 150W 42V Dimmable
View product

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