Its listed interrupting capacity is 15 kA at 230/400 V AC, which means it can safely clear a fault current up to that level without welding its contacts or rupturing the arc chamber — a figure that governs its use in high-fault-capacity panels where standard 6 kA or 10 kA breakers would not hold coordination.
Siemens 5SY4103-8CV MCB, 1P D3, 15kA Icu 230/400V
MPN5SY4103-8CV
Siemens 5SY4103-8CV, 1-pole D-curve 3A miniature circuit breaker, Icu 15kA at 230/400 V AC.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Product details
Frequently asked questions
What is the breaking capacity of 5SY4103-8CV?
The 5SY4103-8CV has an interrupting capacity (Icu) of 15 kA at 230/400 V AC, which is the maximum fault current it can safely interrupt.
Where can I buy 5SY4103-8CV?
This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.
What does the D-curve on 5SY4103-8CV mean?
The D tripping characteristic means the magnetic trip operates at 10 to 20 times the rated current (3 A), so it tolerates high inrush currents typical of motor and transformer loads without nuisance tripping.
MPN
5SY4103-8CV