F&F MST-03 Bedienungsanleitung
- 1 -
MST-03
Inrush current limiter for
230 V AC circuits
MST-03 is designed to limit current overcurrents occurring when
switching on the power supply of circuits with inductive or capa-
citive characteristics (such as LED lighting, pulse power supplies,
lighting fixtures) or non-linear characteristics (such as incande-
scent and halogen lamps).
When switched on by a momentary (bell) switch, the initial cu-
rrent flowing through capacitive, inductive or non-linear loads
may exceed the rated values many times. The duration of such
overcurrent is very short (usually less than 0.1 second), but due
to the level of overcurrent it can lead to tripping of overcurrent
protections or bonding of relay contacts in home automation sys-
tems. When switched on, the MST-03 forces the current to flow
through the built-in NTC thermistor limiting the maximum cur-
rent amplitude. After a period of 1÷1.5 seconds the thermistor is
blocked and from then on the current flows into the load witho-
ut any restriction. The resistance of the thermistor depends on
Purpose
Functioning
F&F Filipowski sp. j.
Konstantynowska 79/81, 95-200 Pabianice, POLAND
phone/fax (+48 42) 215 23 83 / (+48 42) 227 09 71
www.fif.com.pl; e-mail: biuro@fif.com.pl
Do not dispose of this device in the trash along with other waste!
According to the Law on Waste, electro coming from households free of charge and can
give any amount to up to that end point of collec� on, as well as to store the occasion of
the purchase of new equipment (in accordance with the principle of old-for-new, regard-
less of brand). Electro thrown in the trash or abandoned in nature, pose a threat to the
environment and human health.
- 2 -
the current value and the time of operation, so that the effect of
the limitation weakens over time, minimizing the current spike
that could occur when the thermistor is disconnected.
Illustrative presentation of the operation of MST-03
MST-03 is not designed for smooth lighting brightening.
1.Disconnect the power supply.
2.Fix the limiter on a rail in the distribution box.
3.Connect to the circuit according to the diagram.
Mounting
- 3 -
2, 3 power supply 230 V
5, 6 outputs (connected inside the device)
Wiring diagram
Description of terminals
- 4 -
power supply 230 V AC
output voltage 230 V AC
maximum load current (AC-1) 30 A
executive element relay + NTC thermistor
switching delay 1÷1.5 s
power consumption 1 W
terminal 2.5 mm² screw terminals
tightening torque 0.4 Nm
working temperature -25÷50°C
dimensions 2 modules (35 mm)
mounting on TH-35 rail
ingress protection IP20
The F&F products are covered by a warranty of the 24 months
from the date of purchase. Effective only with proof of purchase.
Contact your dealer or directly with us.
F&F Filipowski sp. j. declares that the device is in conformity
with the essential requirements of The Low Voltage Directive
(LVD) 2014/35/EU and the Electromagnetic Compatibility (EMC)
Directive 2014/30/UE.
The CE Declaration of Conformity, along with the references to
the standards in relation to which conformity is declared, can be
found at www.fif.com.pl on the product page.
Technical data
Warranty
CE declaration
E210915
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