Product Catalogue Power Resistors - Ruhstrat GmbH

Applications of
Ruhstrat power resistors
Load resistors
Whether they are needed for
test purposes and for proving
batteries, transformers, generators,
power generation aggregates
and power supply units
or as load bank for your test
field – Ruhstrat offers you an
economic solution for each kind
of application. Power values of
several MW under permanent
operation as well as special constructions can be implemented.
The devices which are in most of the cases customized products
can be equipped with any kind of step control, regulation,
measurement and control unit. Upon request also an inductive
and/or capacitive component can be added to the load resistors,
in order to simulate different kinds of load with various phase
differences or certain idle (reactive) powers with generators,
switching, contactor or control loadings.
Damping resistors
Ruhstrat damping resistors are
integral parts of inrush current
damping units. Especially with
the manufacture of transformers
damping resistors are used
for limiting the inrush current.
With Ruhstrat inrush current
damping units inrush currents are limited to the 3.5-
fold rated current.
Braking resistors
Ruhstrat braking resistors
can take short-time loads
as well as the desired permanent
power (e. g. braking
resistors for frequency converter
drives).
30Power resistors
Test resistors
Whether you need a proof of functioning
for generators or a load bank for your test
field – we offer you an economic solution
for each kind of application. Power values of
several MW under permanent operation as
well as special constructions can be implemented.
In case of test field application the
operation surface of the resistor enclosure is
made with screenprint, if desired, for easier
and clearer usability.
Discharge resistors
By means of Ruhstrat discharge resistors
inductive and capacitive components resp.
batteries are discharged. With batteries they
are used to ascertain which is the remaining
capacity of an accumulator battery which
had been fully charged before. Whether you
need the discharge resistor for insertion into
substations or as mobile device, with natural
air cooling or with forced air ventilation –
Ruhstrat has the ideal solution for each kind
of application.
Laboratory resistors
Ruhstrat laboratory resistors have been developed specially for
schools, colleges, institutes and universities. Whether they are
needed as fixed resistors, slide resistors or variable resistors – all
laboratory resistors are completely
equipped with bottom plate
and rubber feet, shock-proof
insulating binding posts and
earthing terminal as well as with
a protective cover.
Ruhstrat GmbH · Leinetal / Auf der Mauer 1 · 37120 Bovenden
Grounding resistors
In medium-voltage mains with
neutral earthing with low resistance
our grounding resistors limit
a coming up earth fault current to
an admissible maximum value until
the respective protective relays
have switched off the faulty circuit.
Ruhstrat grounding resistors
are completely delivered according
to the customer’s requirements,
with a current transformer, no-load
switch or load switch etc..
phone +49 (0) 55 1 820 830 - 0 · fax +49 (0) 55 1 820 830 - 50
Starting resistors
Among other things Ruhstrat starting
resistors are used for AC squirrel cage
motors (starting column resistors), for
AC motors with slip ring rotor (starting
rotor resistors) or for DC motors.
e-mail: info@ruhstrat.com · www.ruhstrat.com