The 5SY3040-7KV26: The C-curve (40 A) means the magnetic trip operates between 5× and 10× rated current — 200 to 400 A instantaneous — suited for motor-starting or transformer inrush on lighting and general-purpose circuits.
Siemens 5SY3040-7KV26 MCB, 1+N-Pole C 40A, 4.5kA
MPN5SY3040-7KV26
Siemens 5SY3040-7KV26, miniature circuit breaker, 230 V, 4.5 kA, 1+N-pole/1 MW, neutral left, C-curve 40 A, D=70 mm.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Product details
Frequently asked questions
What does the 1+N-pole and neutral left mean for panel wiring?
The breaker switches both the line and neutral conductors, with the neutral terminal positioned on the left side of the module. This matters for busbar alignment and feed direction in the distribution board — the neutral bus must enter from the left.
Where can I buy the 5SY3040-7KV26?
This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time.
MPN
5SY3040-7KV26