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Combination Starters & Starters for Group Installation

SIRIUS 3RA2 Motor Starters

General data

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SIRIUS Innovations Supplement 2011

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Overview

3RA2 motor starters

The 3RA2 fuseless motor starters consist of the 3RV2 motor

starter protector and the 3RT2 electromechanical contactor. The

devices are electrically and mechanically connected using pre-

assembled assembly kits (link modules, wiring kits and standard

mounting rail or

busbar adapters).

Around 500 preassembled 3RA2 combinations of these innova-

tive 3RT2 controls and 3RV2 protection equipment can be

ordered for direct-on-line and reversing starting of standard in-

duction motors up to 32 A (approx. 20 HP/460 V).

In the 3RA2 motor starter, the 3RV2 motor starter protector is

responsible for overload and short-circuit protection. Back-up

protective devices, such as melting fuses or limiters, are super-

fluous here, as the motor starter protector is capable of with-

standing short-circuits up to 65 kA at 480 V and 30 kA at 600 V.

See the the actual SCCR ratings by device listed on the selection

pages of this chapter.

The 3RT2 contactor is particularly suitable for extremely

complex switching tasks requiring the greatest endurance.

The 3RA2 motor starters are available with setting ranges from

0.14 to 32 A in sizes S00 and S0:

The size of the 3RA2 motor starters is based on the size of the

contactor:

The combination of an S00 motor starter protector with an S0 contactor is

possible only for screw connection versions.

Operating conditions

3RA2 motor starters are climate-proof. They are intended for use

in enclosed rooms in which no severe operating conditions

(such as dust, caustic vapors, hazardous gases) prevail. Suit-

able covers must be provided for installation in dusty and damp

locations.

Tripping times

All 3RA2 motor starters described here are designed for normal

starting, in other words for overload tripping times of less than

10 s (CLASS 10). At rated-load operating temperature the trip-

ping times are shorter, depending on the particular equipment

and the setting range. The exact values can be derived from the

tripping characteristics of the motor starter protectors.

Connection methods

For all 3RA2 starters up to 32 A, spring-type connection is avail-

able as well as screw connection. To connect two devices with

spring-type connection there are plug-in connection modules for

sizes S00 and S0 which enable very quick mounting of the start-

ers and a vibration-resistant assembly.

To connect a motor starter protector with screw connection to a

contactor with spring-type connection there are special hybrid

connection modules for S00 and S0.

While starters can be assembled with either spring-type or

screw connection, the pre-assembled versions offered in this

chapter are with screw terminals only. For spring-type versions,

simply order the components listed on the spring-type terminal

pages and assemble these starters quickly and efficiently with-

out the use of any tools.

Size Width Max. rated current

n max

For induction motors

up to

mm A HP

S00 45 16 10

S0 45 32 20

Size of 3RA2 S00 S0

Size of 3RV2 motor starter protector S00 S00

, S0

Size of 3RT2 contactor S00 S0

Screw terminals

Spring-type terminals

These terminals are indicated in the corresponding

tables by the symbols shown on orange

backgrounds.