Siemens SIRIUS 3RA, Equipment Manual

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Standards
2
Fuseless load feeders are manufactured and tested in accordance with IEC 60947 – Part 1 and
Part 2.
Types of coordination
Types of coordination are important selection criteria for fuseless load feeders. They are defined
in the appendix, under "Types of coordination (Page 135)".
Approvals/Test reports
Extensive approvals and test certificates are available for 3RA2 pre-assembled complete devices.
If you assemble the load feeders yourself, all approvals and test certificates of the individual
devices and the certificates for type-tested combinations apply.
2.1 Requirements for switching high-efficiency motors
The increased requirements for protection devices and switchgear when switching high-
efficiency motors are covered by the new utilization category AC‑3e introduced in
the IEC 60947‑4‑1 product standard.
The utilization category AC‑3e takes into account the higher switch-on characteristic of
efficiency-enhanced motors. This is reflected, for example, in a higher starting current when
starting squirrel-cage motors.
All SIRIUS protection devices and switchgear that are subject to the IEC 60947‑4‑1 product
standard meet the increased requirements in accordance with utilization category AC‑3e and
are suitable for use with high-efficiency motors.
SIRIUS 3RA Load Feeders
Equipment Manual, 02/2022, A5E03656507520A/RS-AC/004
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