Camtec Power Supplies GmbH – Gewerbestraße 30 – DE76327 Pfinztal – Germany
p.4/6 (10.2019-01-0)
Phone +49(0)721 46596-0 - Fax +49(0)721 46596-77 –
www.camtec-gmbh.com
-
(Subject to alterations. This product is not designed to be used in applications such as life support systems wherein a failure or malfunction could result in injury or death)
Field Applications
The ESB303 limiter allows connecting much more capacitive loads (e.g. LED-power supply / LED-driver) to a pre-installed
circuit breaker CB. The ESB avoids that the MCB will be tripped. This occurs independent to the objective initial current.
The result is that the number of A.C. branch lines and the pre-installed MCB can be reduced dramatically. Installation
cost exhibit a sustained decline. Alternatively, the cross section of the branch lines can be reduced when using smaller
and faster responding circuit breakers. The cost saving from copper is essential. Sensitive AC networks can be fused
safer (e.g. Traffic Control Systems, Street-Lighting, Parking Lots and Tunnels). When the ESB303 is installed correctly,
the neutral wire (N) is looped trough. The inrush protection circuit always acts to the line conductor. The load relates
to the AC in such a way that a circuit breaker or an earth-leakage-trip works within the limits of the legal rules. This fact
is also applied while the limiting circuit acts. The ESB303 is designed for capacitive loads, only. The ESB303 cannot be
used together with transformers, coils, AC-motors & drives, heaters or with DC-voltage at all.
General type information ESB303.LED
The ESB303-model is a universal inrush current limiter. The concept design is made to construct optimized A.C.
networks in the building automation, the machine building and in the lighting sector. Tripping the installed circuit
breaker will be effectively prevented. The inrush limiting time is adjusted to the values of a typical LED switch mode
power supply or a LED-driver. The connectable load capacity is such as high, that even in the extremes cases it is rather
impossible to exceed it in a 16A network. Installed contractors will be discharged and their lifetimes will considerable
increase. Note that the ESB303 is not designed to operate together with gas induction lamps or other conventional
lighting device. The ESB303 is designed for capacitive loads, only.
Design-In of the ESB303 into A/C networks
The ESB303 model is a precise inrush current limiter with an overall tolerance of ±6% of the face value. For the
dimension of an upstream connected circuit breaker the R.M.S is the key value of the inrush current, not the peak
current. The thermal trigger point will not be met, even while using an extreme fast CB. All-dominant is the magnetic
trigger current. By using the empirical formula I
(peak)
x 0,707
(factor)
= I
(r.m.s.)
the tripping current can be defined exact. Bear
in mind that all the higher the inrush current is, all the faster the input capacitor of several connected switch mode
power supplies will be loaded. Deduced by this fact we can say that within a 230V or a 400V 16A A/C N-wire network
the ESB303.LED.200/400V limiter is the right selection for a B13A 10kA or a B16A MCB 10kA. The technical table on
page 2 shows the R.M.S value of the ESB303. Do not use an MCB that has a larger value than 16A
(Fig.5 limiting time T
on
)
(Fig.7 inrush without ESB303)
(Fig.6 AC dump detection T
off
)
(Fig.8 inrush with ESB303)
t
on
Fig.7 and Fig.8
Fig.7 and Fig.8 show the typical start
behavior of a NTC protected switch
mode power supply. The used test
item is a CAMTEC HSE10001.24T
power supply with an output of
24V/42A (1008W) on DIN-Rail.
The peak current recordings show the
precise limiting of the inrush from
formerly 62A
peak
to 16A
peak
. The
corresponding R.M.S level, that is
responsible for the magnetic tripping
of the MCB, is mark down by factor
0,707. After the time T
on
elapsed it is
identified that the power supply
starts neatly into the continuous
operation mode. Now the current is
absorbed pulse-shaped from the AC.
In detail the full load R.M.S. current
consumption level of the HSE10001
hits 9A @ 230Vac.
62A
peak
16A
peak
230Vac
230Vac
