The Siemens 5SU1653-7KV40 is a combined residual-current device and miniature circuit breaker (RCBO), branded FI/LS-Protector Type A (PSE/SSF). It packs a 40 A C-curve thermal-magnetic trip with a 300 mA Type A residual-current sensing element into a 1+N-Pol module, rated for 4.5 kA breaking capacity. Type A detection means it catches pulsating DC fault currents as well as sinusoidal AC — essential on circuits feeding single-phase rectified loads like switched-mode power supplies or LED drivers. The 300 mA IΔn is a personnel-protection threshold; in many national wiring rules this rating is used for socket-outlet circuits in commercial or light-industrial installations where nuisance tripping from leakage currents must be balanced against shock-risk coverage.
5SU1653-7KV40 Siemens FI/LS Protector Type A, 40A C, 300mA,
MPN5SU1653-7KV40
Siemens 5SU1653-7KV40 FI/LS-PROTECTOR TYPE A (PSE/SSF), D=70MM IFN 300MA, 4.5KA, 1+N-POL C 40A.
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 is the 5SU1653-7KV40 used for?
It is a combined RCD/MCB (RCBO) that provides both overcurrent protection (C-curve, 40 A) and residual-current protection (Type A, 300 mA) in a single 1+N-Pol module, typically used in final sub-circuits of commercial or light-industrial distribution boards.
Where can I buy the 5SU1653-7KV40?
The 5SU1653-7KV40 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.
MPN
5SU1653-7KV40