The 5SU1644-8RC40: The Type A detection catches both sinusoidal AC faults and pulsating DC residual currents, which covers most modern electronic loads like VFDs and switched-mode supplies.
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Siemens 5SU1644-8RC40 RCBO, 40 A, 4-pole, D curve
MPN5SU1644-8RC40
Siemens 5SU1644-8RC40 RCBO, 40 A, 4-pole, 7 modules, D characteristic, Type A, 300 mA residual current.
Source DocumentedChannel stated on listing & quote
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Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026
Product details
Frequently asked questions
What does the D characteristic mean on this RCBO?
The D curve allows a higher multiple of the rated current before the magnetic trip operates — typically 10 to 20 times In.
MPN
5SU1644-8RC40