The Siemens 5SM1642-6BA is a 4-pole residual current protective device (RCD), also known as an FI protector, rated 25 A at 400 V with a rated residual current IΔn of 0.3 A. It is a Type A device, meaning it detects sinusoidal AC earth faults and pulsating DC earth faults — the standard requirement for most general-purpose circuits with electronic loads like rectifiers or variable-speed drives.
Siemens 5SM1642-6BA FI Protector Type A, 25A 4P 0.3A 400V
MPN5SM1642-6BA
Siemens 5SM1642-6BA FI protector Type A (PSE/SSF), D=55mm, 25A 4-pole, IΔn 0.3A, 400V, 4TE.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Product details
Frequently asked questions
Where can I buy 5SM1642-6BA and how do I get a price?
The 5SM1642-6BA is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.
What is 5SM1642-6BA's listed description?
The listed description is FI PROTECTOR>N< TYP A (PSE/SSF), D=55MM 25A 4POLE IFN 0,3A 400V 4TE.
What is the 5SM1642-6BA's rated residual current?
The rated residual current IΔn is 0.3 A, suitable for circuits requiring a 300 mA trip threshold.
MPN
5SM1642-6BA