View source for LED lamps - choice of circuit breaker

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{{Highlightbox |For LED lamps, the device which limits the number of luminaires is the MCB and not the contactor like for other lamp technologies}}

The new lighting technologies with electronic interfaces (ballasts, drivers) cause a large transient inrush current at power up which could result in circuit breaker tripping.

These phenomena are especially significant with LED lighting.

==Coordination curves between the number of LED luminaires and circuit breaker rating==

{{Gallery|N47|Coordination between circuit breaker and luminaires LED||2
|DB422685_EN.svg|a|Rating 10 A
|DB422686_EN.svg|b|Rating 16 A
|DB422687_EN.svg|c|Rating 20 A
|DB422688_EN.svg|| 
}}

== Maximum number of LED luminaires depending on the circuit breaker rating and curve ==

{{tb-start|id=Tab1386|num=N48|title=Maximum number of lamps according to the circuit breaker rating and curve, for LED lamps|cols=5}}
{| class="wikitable"
|-
! rowspan="3" | Unit power of the luminaire (W)
! colspan="12" | Circuit breaker rating and curve
|-
! colspan="4" | 10 A || colspan="4" | 16 A || colspan="4" |20 A
|-
! B || C || D || B, C, D with iCT+ or iTL+ || B || C || D || B, C, D with iCT+ or iTL+ || B || C || D || B, C, D with iCT+
|-
| '''10''' || 15 || 30 || 48 || - || 22 || 44 || 69 || - || 32 || 63 || 98 || -
|-
| '''30''' || 11 || 24 || 38 || 57 || 17 || 34 || 54 || 90 || 25 || 49 || 77 || 110
|-
| '''50''' || 8 || 17 || 27 || 41 || 12 || 25 || 39 || 66 || 18 || 35 || 56 || 83
|-
| '''75''' || 4 || 11 || 17 || 28 || 7 || 15 || 25 || 44 || 11 || 21 || 36 || 55
|-
| '''150''' || - || 5 || 9 || 13 || 2 || 7 || 12 || 22 || 4 || 9 || 18 || 28
|-
| '''250''' || - || 3 || 5 || 8 || - || 4 || 7 || 13 || - || 5 || 10 || 16
|-
| '''400''' || - || 1 || 4 || 5 || - || 2 || 6 || 8 || - || 3 || 9 || 10
|}

According to the control device used, the transient current surge may:
* require the circuit breaker to be derated according to the number of luminaires / circuit breaker rating coordination curves, when using standard control devices: CT, TL (electromechanical control device),
* be reduced by the use of the following technologies:
** softStart: using a command integrated in the driver or a dimmer switch,
** controlled contactor (iTL+, iCT+) (closes when the voltage passes through «0», derating is related to the Cos φ of the lighting circuit).

These technologies allow circuit breakers without derating related to the technology of the lamps to be used.

'''Example:'''

Circuit rated power = 230 V AC x Circuit breaker rating x Cos φ.