3RW442. datasheet(11/40 Pages) SIEMENS

11 / 40 page

What are the advantages of soft

starting?

The advantages are multiple, as the

SIRIUS 3RW30 reduces the stress on the

motor by reducing the start-up torque

and protects the mains against hazardous

current peaks through reduced current

input. This reliably eliminates line voltage

dips.

What are the benefits of the SIRIUS

3RW30?

The SIRIUS 3RW30 is particularly

compact thanks to its consistently

optimized power components in hybrid

technology. It thus also facilitates side-

by-side assembly up to 60 °C. It offers

fast configuration and easy mounting

with only 3 motor supply cables. Small

fuseless load feeders can be assembled

with a single module – with the SIRIUS

3RV circuit breaker. Also fused feeders

can be realized in a fast and space-saving

manner in combination with SIRIUS 3RB

solid-state overload relays.

What about safety and reliability?

Thanks to two-phase control and the

patented “polarity balancing” control

principle, the SIRIUS 3RW30 is a

dependable device which ensures safe

and reliable operation. In addition,

the integrated bypass contact system

reduces the soft starter‘s heat loss

during operation.

What are the application areas?

The SIRIUS 3RW30 can be employed in

almost any standard application up to

a motor rating of 55 kW with 400 V.

For example for driving conveyor belts,

compressors, grinding machines, saws,

agitators, etc.

How is the SIRIUS 3RW30 set?

Ramp-up time and starting voltage

can be comfortably and easily set via

2 potentiometers, ensuring optimum

starting behavior.

How is the soft starter controlled?

Without interface relays the SIRIUS

3RW30 can be directly controlled via

the PLC – or via the control input. The

respective operating state is signaled via

a relay output.

What are the saving potentials?

Space savings in the control cabinet

up to 70% are achievable compared to

wye-delta* starters (example 18.5 kW:

45 mm width instead of 158 mm). The

SIRIUS 3RW30 also pays off in terms of

mounting: with only 3 instead of 6 motor

supply cables.

The 3RW30 is also available with

removable control terminals. When

replacing a 3RW30, the wiring on the

terminal thus remains intact (“permanent

wiring”) and the terminals are simply

snapped onto the new 3RW30, which

saves a considerable amount of time.

Is the SIRIUS 3RW30 affordable?

Absolutely as it not only ensures reliable

operation thanks to standardized

production, but is also very attractive in

terms of price.

How about accessories?

In addition to easy-to-mount terminal

covers for optimum touch protection,

also box terminal blocks, connection

modules and labeling strips from the

SIRIUS range are available for the 3RW30.

With the SIRIUS 3RW30 in size S0 (45 mm),

up to 38 A can be switched

* star-delta

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