LEDs tripping type 2MCB!

[Octopus]

^^ OK lets use 30W as the under cupboard lights - so best option would be to disconnect 1 lamp or transformer to see if it improves.

Wonder how many other lights are on the circuit? How many are on when it trips?

My pennies are on inrush currents...

 

[Delboybully]

I had this once. Same situation. Need led spots and led under cupboard lights in 3 sections fed from 3 transformers. Turned out one of the transformers was faulty

 

[hoppy]

Thanks for the replies.
Apologies been really busy, I haven't been back to the property yet, the drivers are Ngl uk ltd, input 1 amp and output 3 amp, I have no other information about them.
The circuit trips only when the under cabinet lights are o and no other lighting.
I am thinking it is the In rush current as it doesn't happen all the time and it is when they are switched on, not when they have been on for a bit.

 

[dmxtothemax]

What happens if you only switch on the under cabinet lights with nothing else on ?

 

[marconi]

A suggested solution: Buy some Negative Thermal Coefficient (NTC) Thermistors and insert one in series with the line feed to the LED driver. See:

ntc thermistor | Rapid Online - https://www.rapidonline.com/Catalogue/Search?query=ntc%20thermistor&filterSearchScope=1&tier=NTC%20Inrush%20Limiters

Install the NTC thermistor inside a suitable non-flammable enclosure with the thermistor not touching the sides.

An NTC thermistor has a negative thermal co-efficient which means at low temperature (eg ambient) its resistance is high, but as current flows through it and ohmic heating occurs its resistance decreases to a low value. For example for a 2A thermistor its resistance is 50Ω at zero current and at 2A 0.8Ω. At 2A and operating temperature the volt drop will be 1.6V and the power dissipated is 3.2W. See link and technical specifications and data sheets. You might want to do a trial first.

Instead of inserting the thermistor in the line feed you could also try inserting one in series with a pole of the LV output side or perhaps one in series with the feed to each LED luminaire. The former is probably a better idea because the latter might result in uneven brilliance from the luminaires.

 

[1Justin]

A good idea that @marconi. I had a lot of trouble with a load of Meanwell LED drivers in the past for external floods.
That trick may have saved me a load of a headache, and eventually needing a 16A D type for a 1 Amp load (Fortunately the numbers just worked out.. but it had me sweating).