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Siemens 5SY4550-8CV — 1-Pole MCB (DIN Rail)

Siemens 5SY4550-8CV MCB 1P+N D50, 15kA Icu

MPN5SY4550-8CV

Siemens 5SY4550-8CV, MCB, Icu=15kA 230/400V, 1P+N, D50 characteristic.

Siemens 5SY4550-8CV datasheet (PDF)
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Product details

What the 15 kA Icu means for the panel

The Siemens 5SY4550-8CV is a 1P+N miniature circuit breaker with a D50 tripping characteristic and a rated ultimate breaking capacity (Icu) of 15 kA at 230/400 V. The D50 curve means the magnetic trip holds up to 10× rated current (500 A for this 50 A unit), so it tolerates the inrush of motor loads, transformers, or capacitive banks without nuisance tripping on start-up.

The 1P+N form factor occupies a single modular width (roughly 18 mm), leaving the adjacent slot free for the neutral busbar or a second MCB.

Frequently asked questions

What does the D50 curve mean for motor starting?

The D characteristic provides a magnetic trip threshold of 10× In (500 A), which avoids nuisance tripping during the high inrush of direct-on-line motor starts, transformer energization, or capacitive loads.

Where can I buy the 5SY4550-8CV?

This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.

MPN
5SY4550-8CV