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CA452001EN - March 2015

Lighting Controls

Inrush Limiter

It is important to understand that the control gear

(drivers) used for LEDs do not have the same

characteristics as conventional control gear used

with traditional light sources.

The short term inrush current of some modern

LED drivers can be significantly higher than that of

conventional high frequency control gear. This can

cause problems with nuisance tripping within the

circuit protection (MCB’s) and can damage devices

used to control/switch the lighting load. Therefore

it is important that the electrical circuit design is

appropriate for the luminaires and the circuit has

the required electrical protection. This is especially

important when looking to replace existing

traditional luminaires.

Electrical characteristics vary dependent on

the luminaire type and LED driver used. Our

recommendations for the selection of the

maximum number of luminaires which can be

connected to different circuit breaker types are

available on request.

It should be noted that although figures are listed

for Type B & C breakers, we would recommend

that C type breakers are used.

With the need for protection against excessive

inrush currents to protect against circuit breaker

tripping and damage to switching devices, we have

taken the proactive step to introduce a new device,

the PCL16A inrush peak current limiter.

This device can be easily installed as part of

the final distribution components, it is simply

connected between the supply circuit breaker and

the load (i.e. luminaire circuit). It protects the circuit

from inductive and capacitive loads. Rated at 16A

for continuous operation, it allows a circuit to be

loaded to 16A with inrush surges then managed by

the device.

The PCL16A device is available as an individual

Din-Rail mount component or with up to 3 supplied

pre-fitted into a remote enclosure to further simplify