The Siemens SENTRON 5SL5120-7CC is a 1-pole DC miniature circuit breaker rated for 20 A with a C-tripping characteristic, breaking capacity of 10 kA at 125 V DC. The C-curve (5–10× In) handles moderate inrush from lighting or control transformers without nuisance trips, while the 10 kA interrupt rating means it can safely clear a fault up to that level — important for DC bus protection where fault currents can be stiff.
Siemens SENTRON 5SL5120-7CC Miniature Circuit Breaker, 1-Pol
MPN5SL5120-7CC
Siemens SENTRON miniature circuit breaker, 1-pole DC, 20 A, C-curve, 125 V DC, 10 kA breaking capacity, 18 mm wide, IP20.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026
Specifications
| Parameter | Value |
|---|---|
| Product designation | Miniature circuit breaker |
| Brand name | SENTRON |
| Number of poles | 1 |
| Application suitability | Residential buildings/infrastructure |
| Parameter | Value |
|---|---|
| Tripping characteristic class | C |
| Overvoltage category | III |
| Parameter | Value |
|---|---|
| Mounting position | any |
| Width | 18 mm |
| Height | 90 mm |
| Depth | 76 mm |
| Installation depth | 70 mm |
| Modular width units | 1 |
| Torque, min. | -40 °C |
| Torque, max. | 75 °C |
| Sealable | Yes |
| Parameter | Value |
|---|---|
| IP protection class | IP20, with connected conductors |
| Pollution degree | 2 |
| Halogen-free | Yes |
| Silicone-free | Yes |
Product details
Frequently asked questions
What is the 5SL5120-7CC used for?
It's a 1-pole DC miniature circuit breaker with a C-curve, rated 20 A at 125 V DC with a 10 kA breaking capacity, used for protecting DC circuits in residential and infrastructure panels.
Will the 5SL5120-7CC drop into a panel wired for the 5SL6120-7?
Yes — same physical footprint (76 × 18 × 90 mm), same DIN-rail mounting, same terminal layout. The swap is mechanical only; the electrical difference is DC vs AC rating, so verify the circuit voltage type before replacing.
MPN
5SL5120-7CC