What Does the AB Suffix on a MEAN WELL LED Driver Part Number Mean?

What does the AB suffix on a MEAN WELL LED driver mean?

Customers who are familiar with MEAN WELL’s HLG and ELG series LED drivers may have noticed that some models have an ‘AB’ suffix to the part number.

MEAN WELL HLG-150H Standard Model


Up until recently the following versions have been available: 



No Suffix (Blank)

Fixed output, IP67

'A' Suffix

Output voltage and current can be trimmed via potentiometers. IP65 

'B' Suffix

3-in-1 dimming 0-10V (or 1-10V depending on model), PWM, or resistance dimming. IP67 

DA (ELG only) 

DALI dimming. IP67 

The ‘AB’ suffix denotes that the LED driver has both the 3-in-1 dimming function and the facility to trim the output current and voltage, via the built-in potentiometers.  
The HLG-320H series is an exception, because only the output current can be adjusted on these models. 

You can browse the product range by following the below link: 

Weatherproof LED Drivers 

It should be noted that the ‘AB’ models have an IP65 ingress protection rating.   

Benefit of using an ‘AB’ Model 

The ‘AB’ models are particularly useful if you are working on applications where voltage drop could be a consideration, or if you need a constant current LED driver that is dimmable.  

One method of overcoming voltage drop is to use a LED driver that allows you to trim the output voltage. This allows use to ‘wind up’ the output voltage a little to compensate for the voltage drop, so that the correct voltage is delivered to the LEDs. 

MEAN WELL’s constant voltage HLG and ELG LED drivers can also operate in constant current mode. The current output is equal to the driver’s maximum rated current output. When using an ‘AB’ model you can adjust the current output to the level required.  

The product data sheets show the range of adjustment permissible and the forward voltage range a constant current output can be delivered at. In MEAN WELL data sheets, the forward voltage range is noted as ‘constant current region’. 

If you have any questions about MEAN WELL LED drivers, please do not hesitate to contact ADM on 1300 236 467. A member of our expert team will gladly answer any questions that you may have. 

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1 November 2019