The 5SL4120-0RC: The 20 A rating sets the continuous load limit — don't push past 20 A sustained on a single pole. The Z characteristic is the key differentiator here: it's designed for circuits where the load current is steady but short-duration inrush is minimal — think control transformers, relay coils, PLC power supplies, and electronic ballasts. If you're protecting motor circuits or general-purpose socket outlets, a B or C curve is usually the better call.
Siemens 5SL4120-0RC MCB, 20A 1-Pole Z Curve, 10kA
MPN5SL4120-0RC
Siemens 5SL4120-0RC, miniature circuit breaker, 20 A, 1-pole, Z characteristic, 10 kA breaking capacity.
Source DocumentedChannel stated on listing & quote
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Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026
Product details
Frequently asked questions
What is 5SL4120-0RC's breaking capacity and trip curve?
It is a 20 A, 1-pole miniature circuit breaker with a Z characteristic and 10 kA breaking capacity. The Z curve trips between 2.5 and 5 times rated current, suited for semiconductor and electronic loads.
Where can I buy 5SL4120-0RC?
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 commitment.
MPN
5SL4120-0RC