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2.2 Requirements for switching high-efficiency motors
2.2
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.
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SIRIUS 3RB24 electronic overload relay for IO-Link
Equipment Manual, 07/2022, NEB969165602000/RS-AA/003
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