Siemens 5SY4125-8CV, MCB, 1-pole D-curve 25 A, Icu 15 kA at 230/400 V AC.
The Siemens 5SY4125-8CV is a 1-pole miniature circuit breaker (MCB) with a D tripping characteristic, rated 25 A and a breaking capacity (Icu) of 15 kA at 230/400 V AC.
In a crowded panel, the D-curve and 15 kA rating let you coordinate downstream with a higher-rated upstream device — typical for a motor feeder branch where the breaker sits after a 63 A or 100 A molded-case switch.
The 5SY4125-8CV has a rated ultimate breaking capacity (Icu) of 15 kA at 230/400 V AC, single-pole.
This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time.
The D tripping characteristic means the magnetic trip operates at 10–20× the rated current (250–500 A for this 25 A breaker), which suits loads with high inrush like motors, transformers, or discharge lighting.
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