This is a molded case breaker, so it's built for the main distribution or large feeder circuits — not the little branch breakers in a lighting panel. The System pro M compact form factor snaps onto DIN rail inside a standard industrial enclosure. For the site electrical engineer, the question is whether the SCCR and trip curve (Z-curve, from the code suffix) coordinate with your downstream gear. The Z-curve means it's sensitive — trips fast on low overcurrents, which makes it a fit for semiconductor or sensitive-load protection where you can't let a small fault ride through.
ABB S203P-Z50 Molded Case Circuit Breaker, Current Productio
MPNS203P-Z50
ABB, System pro M compact, Molded Case Circuit Breaker, S203P-Z50, 0.45 kgs, current lifecycle.
$91.44Ref. price · indicative, final on quote
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
Specifications
| Parameter | Value |
|---|---|
| Weight | 0.45 kgs |
Product details
Frequently asked questions
Will the S203P-Z50 drop into a panel specified around the S201PR-K20?
Both are molded case breakers from the same System pro M compact family, so the DIN-rail footprint and bus-bar pitch are shared. The deciding factor is the trip curve: the S203P-Z50 carries a Z-curve (sensitive, fast trip), while the S201PR-K20 uses a K-curve (higher inrush tolerance for motor or transformer loads). Verify the coordination study before swapping — they are not drop-in equivalents for the same protection role.
MPN
S203P-Z50