SIRIUS 3RA21/22 load feeders
6.2 Product description
SIRIUS Innovations
564 System Manual, 01/2011, A8E56203870002-03
6.2 Product description
6.2.1 Overview
Fuseless load feeders
Fuseless load feeders are device combinations comprising a 3RV motor starter protector for
overload and short-circuit protection and a 3RT contactor for normal switching. The SIRIUS
portfolio features two different configuration options for fuseless load feeders.
● 3RA2 tested pre-assembled complete devices
● Tested combinations of individual devices
6.2.2 Device versions
The modular standard components in the SIRIUS modular system are ideally matched and
support the configuration of fuseless load feeders. The load feeders are also available as
3RA2 complete devices.
Both options are characterized by the following features.
● Type of coordination 1 or 2
● Rated control supply voltage
● Mounting on busbar or DIN rail
A detailed overview of the fuseless load feeders product range appears below.
Types of coordination
Fuseless load feeders up to 38 A (discrete configuration of individual devices) and 32 A (pre-
assembled complete devices) can be configured in sizes S00 and S0. The overall width is
45 mm for all individual devices.
The table below lists the maximum power of the three-phase motor for pre-assembled
3RA2 complete devices based on the type of coordination at a voltage of 400 V AC.
Table 6- 1 Motor starter protector sizes
Size Type of coordination Power of three-phase motor
1 0.06 to 7.5 kW S00
2 0.06 to 1.5 kW
1 7.5 to 15 kW S0
2 1.5 to 15 kW
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