Mean Well HLG-40H-42B Power Supply 40W 42V - Dimmable

Description

Features

Universal AC input (up to 305VAC) / Full range

High efficiency up to 90.5%

Built-in active PFC function, PF> 0.9 for 60% of load or higher

Protections: Short circuit / Over current / Over voltage / Over temperature

IP67 / IP65 design for indoor or outdoor installations

Class 2 power unit

Output current adjustable through output cable or internal potentiometer

Cooling by free air convection

Suitable for dry, damp and wet location

Suitable for LED lighting and street lighting applications

Meet 4kV surge immunity level (IEC61000-4-5)

Multiple models for choice: A-Type: IP65 rated. Output voltage and constant current level can be adjusted through internal potentiometer B-Type: IP67 rated and built-in 3 in 1 dimming function (1~10VDC, PWM signal, or resistance) Blank-Type: IP67 rated. Cable for I/O connection D-Type(option): IP67 rated. Timer dimming function, contact MEAN WELL for details.

7 years warranty

General Specification

AC input voltage range	90~305VAC ; 127~431VDC
AC inrush current (max.)	Cold start, 50A at 230VAC
DC adjustment range	±10% rated output voltage (A-Type only)
Current adjustment range	60%~100% rated output current adjustable by internal potentiometer (A-Type only)
Over current protection	95%~108% constant current limiting, auto-recovery
Over voltage protection	109%~145% rated output voltage, shut off, re-power on to recover
Setup, rise, hold up time	1000ms, 80ms, 16ms at full load and 230VAC
Withstand voltage	I/P-O/P: 3.75kVAC, I/P-FG: 2kVAC, O/P-FG:0.5kVAC
Working temperature	-40~+70ºC (refer to output derating curve)
Safety standards	UL8750, TUV EN61347-1, EN61347-2-13, PSE J61347-1, J61347-2-13 approved; Design refer to UL60950-1, EN60950-1, EN60335-1
EMC standards	EN55015, EN61000-3-2 class C, EN61000-3-3, EN61000-4-2,3,4,5,6,8,11, EN61547
Connection Input	UL rated, SJTW 18AWGx3C (30cm)
Connection Output	A/D/Blank-Type: SVT 18AWGx2C (30cm); B-Type: SVT 18AWGx2C (30cm)+UL2517 18AWGx2C (30cm)
Dimension (LxWxH) (mm)	171x 61.5x 36.8

Specifications

Brand

Mean Well
Series

HLG Series
Power Rating

40 Watt
Output Voltage

42 Volt
Rated Current

0.96 Ampere
Input Voltage

90V~305V
No of Output

1
Dimming Control

10V PWM,1-10V,Resistance
Standards Met

CB,CCC,CE,EAC,PSE,RCM,TUV,UL
Operation Mode

Constant Current,Constant Voltage
Operating Temperature

-40°C~80°C
Warranty

7 Year
Length

6.73 in
Width

2.42 in
Height

1.45 in
Weight

1.61 lb

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Frequently Asked Questions

Can the HLG-40H-42B power dimmable 42V LED strips in a fully outdoor setting?

Yes. The HLG-40H-42B provides 40W at 42V with a 1-10V/PWM dimming input, and its IP67 waterproof rating allows direct exposure to rain, snow, and temporary water submersion. This makes it well suited for outdoor decks, walkways, or garden lighting with dimming control.

Is the HLG-40H-42B appropriate for dimmable 42V LED landscape accent lights?

Yes. At 40W it can drive small 42V landscape fixtures, and the dimming input lets you adjust brightness for evening ambiance. The IP67 rating and -40°C to +80°C operating range handle ground-level moisture and wide temperature swings common in landscape applications.

Can I use the HLG-40H-42B for a 42V outdoor LED sign with brightness scheduling?

Yes, as long as the sign draws no more than 40W total. The 1-10V/PWM dimming input can be connected to a timer or controller for automatic day/night brightness changes. The IP67 rating means the driver can be mounted inside or outside the sign enclosure without weather concerns.

How many meters of 42V LED strip can the HLG-40H-42B support?

It depends on the strip's power per meter. The HLG-40H-42B supplies up to 40W at 42V. For instance, a strip rated at 10W/m could run up to 4 meters (40W / 10W per meter = 4m). Verify your strip's rated power per meter and ensure total draw stays at or below 40W.

How well does the HLG-40H-42B hold up in freezing winter conditions?

The HLG-40H-42B is rated for an operating temperature range of -40°C to +80°C, so it handles extreme cold without issue. Combined with its IP67 waterproof seal, it can withstand snow, ice, and freezing rain without requiring additional weatherproofing.

Model	Power	Voltage	Current	IP Rating	Price
Mean Well HLG-40H-12B Power Supply 40W 12V - Dimmable	40W	12V	3.33A	IP67	$36.29	View
Mean Well HLG-40H-24B Power Supply 40W 24V - Dimmable	40W	24V	1.67A	IP67	$33.90	View
Mean Well HLG-40H-24A Power Supply 40W 24V - Adjustable	40W	24V	1.67A	IP65	$35.28	View
Mean Well HLG-40H-12 Power Supply 40W 12V	40W	12V	3.33A	IP67	$34.18	View
Mean Well HLG-40H-15B Power Supply 40W 15V - Dimmable	40.5W	15V	2.67A	IP67	$35.33	View