Other lamp technologies - choice of circuit breaker

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Home > Characteristics of particular sources and loads > Lighting circuits > Other lamp technologies - choice of circuit breaker


Modular contactors and impulse relays do not use the same technologies. Their rating is determined according to different standards and does not correspond to the rated current of the circuit.

For example, for a given rating, an impulse relay is more efficient than a modular contactor for the control of light fittings with a strong inrush current, or with a low power factor (non-compensated inductive circuit).

For LED lamps, see [LED lighting - characteristics|LED lighting]].

Fig. N70 shows the maximum number of light fittings for each relay, according to the type, power and configuration of a given lamp.

  • These values are given for a 230 V circuit with 2 active conductors (single-phase phase/neutral or two-phase phase/phase). For 110 V circuits, divide the values in the table by 2.
  • To obtain the equivalent values for the whole of a 230 V three-phase circuit, multiply the number of lamps and the total acceptable power:
    • by √3 (1.73) for circuits with 230 V between phases without neutral,
    • by 3 for circuits with 230 V between phase and neutral or 400 V between phases.
  • The power ratings of the lamps most commonly used are shown in bold. For powers not mentioned, use a proportional rule with the nearest values.
  • The total acceptable power values mentioned (such as "1550 W to 2000 W" for incandescent lamps - iCT 16A contactor) are provided as an indication only. The minimum value is for the smallest lamp power (1550 W, corresponding to 38 x 40W LED lamps), the maximum value for the highest lamp power.
Products iCT contactors iCT+ contactors
Type of lamp Maximum number of light fittings for a single-phase circuit and maximum power output per circuit
16 A 25 A 40 A 63 A 20 A
Basic incandescent lamps, LV halogen lamps, replacement mercury vapour lamps (without ballast)
40 W 38 1550 W
to
2000 W 		57 2300 W
to
2850 W 		115 4600 W
to
5250 W 		172 6900 W
to
7500 W 		4660 W x cos φ
60 W 30 45 85 125
75 W 25 38 70 100
100 W 19 28 50 73
ELV 12 or 24 V halogen lamps
Ferromagnetic transformer 20 W 15 300 W
to
600 W 		23 450 W
to
900 W 		42 850 W
to
1950 W 		63 1250 W
to
2850 W 		4660 W x Cos φ
50 W 10 15 27 42
75 W 8 12 23 35
100 W 6 8 18 27
Electronic transformer 20 W 62 1250 W
to
1600 W 		90 1850 W
to
2250 W 		182 3650 W
to
4200 W 		275 5500 W
to
6000 W
50 W 25 39 76 114
75 W 20 28 53 78
100 W 16 22 42 60
Fluorescent tubes with starter and ferromagnetic ballast
1 tube without compensation[a] 15 W 22 330 W
to
850 W 		30 450 W
to
1200 W 		70 1050 W
to
2400 W 		100 1500 W
to
3850 W 		4660 W x cos φ
18 W 22 30 70 100
20 W 22 30 70 100
36 W 20 28 60 90
40 W 20 28 60 90
58 W 13 17 35 56
65 W 13 17 35 56
80 W 10 15 30 48
115 W 7 10 20 32
1 tube with parallel compensation[b] 15 W 5 µF 15 200 W
to
800 W 		20 300 W
to
1200 W 		40 600 W
to
2400 W 		60 900 W
to
3500 W
18 W 5 µF 15 20 40 60
20 W 5 µF 15 20 40 60
36 W 5 µF 15 20 40 60
40 W 5 µF 15 20 40 60
58 W 7 µF 10 15 30 43
65 W 7 µF 10 15 30 43
80 W 7 µF 10 15 30 43
115 W 16 µF 5 7 14 20
2 or 4 tubes with series compensation 2 x 18 W 30 1100 W
to
1500 W 		46 1650 W
to
2400 W 		80 2900 W
to
3800 W 		123 4450 W
to
5900 W
4 x 18 W 16 24 44 68
2 x 36 W 16 24 44 68
2 x 58 W 10 16 27 42
2 x 65 W 10 16 27 42
2 x 80 W 9 13 22 34
2 x 115 W 6 10 16 25
Fluorescent tubes with electronic ballast
1 or 2 tubes 18 W 74 1300 W
to
1400 W 		111 2000 W
to
2200 W 		222 4000 W
to
4400 W 		333 6000 W
to
6600 W 		4660 W x cos φ
36 W 38 58 117 176
58 W 25 37 74 111
2 x 18 W 36 55 111 166
2 x 36 W 20 30 60 90
2 x 58 W 12 19 38 57
Compact fluorescent lamps
External electronic ballast 5 W 210 1050 W
to
1300 W 		330 1650 W
to
2000 W 		670 3350 W
to
4000 W 		Not tested 4660 W x cos φ
7 W 150 222 478
9 W 122 194 383
11 W 104 163 327
18 W 66 105 216
26 W 50 76 153
Integral electronic ballast (replacement for incandescent lamps) 5 W 160 800 W
to
900 W 		230 1150 W
to
1300 W 		470 2350 W
to
2600 W 		710 3550 W
to
3950 W
7 W 114 164 335 514
9 W 94 133 266 411
11 W 78 109 222 340
18 W 48 69 138 213
26 W 34 50 100 151
Low-pressure sodium vapour lamps with ferromagnetic ballast with external ignitor
Without compensation[a] 35 W 5 270 W
to
360 W 		9 320 W
to
720 W 		14 500 W
to
1100 W 		24 850 W
to
1800 W 		4660 W x cos φ
55 W 5 9 14 24
90 W 3 6 9 19
135 W 2 4 6 10
180 W 2 4 6 10
With parallel compensation[b] 35 W 20 µF 3 100 W
to
180 W 		5 175 W
to
360 W 		10 350 W
to
720 W 		15 550 W
to
1100 W
55 W 20 µF 3 5 10 15
90 W 26 µF 2 4 8 11
135 W 40 µF 1 2 5 7
180 W 45 µF 1 2 4 6
High-pressure sodium vapour lamps

Metal-iodide lamps

Ferromagnetic ballast with external ignitor, without compensation[a] 35 W 16 600 W 24 850 W
to
1200 W 		42 1450 W
to
2000 W 		64 2250 W
to
3200 W 		4660 W x cos φ
70 W 8 12 20 32
150 W 4 7 13 18
250 W 2 4 8 11
400 W 1 3 5 8
1000 W 0 1 2 3
Ferromagnetic ballast and external ignitor, with parallel compensation[b] 35 W 6 µF 12 450 W
to
1000 W 		18 650 W
to
2000 W 		31 1100 W
to
4000 W 		50 1750 W
to
6000 W
70 W 12 µF 6 9 16 25
150 W 20 µF 4 6 10 15
250 W 32 µF 3 4 7 10
400 W 45 µF 2 3 5 7
1000 W 60 µF 1 2 3 5
2000 W 85 µF 0 1 2 3
Electronic ballast 35 W 24 850 W
to
1350 W 		38 1350 W
to
2200 W 		68 2400 W
to
4000 W 		102 3600 W
to
6000 W
70 W 18 29 51 76
150 W 9 14 26 40

[a]  Circuits with non-compensated ferromagnetic ballasts consume twice as much current for a given lamp power output. This explains the small number of lamps in this configuration.
[b]  The total capacitance of the power factor correction capacitors in parallel in a circuit limits the number of lamps that can be controlled by a contactor. The total downstream capacitance of a modular contactor of rating 16, 25, 40 or 63 A should not exceed 75, 100, 200 or 300 μF respectively. Allow for these limits to calculate the maximum acceptable number of lamps if the capacitance values are different from those in the table.

Fig. N70 – Maximum number of light fittings for each relay, according to the type, power and configuration of a given lamp
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