Unlike AC, a DC arc does not self-extinguish at zero-crossing, so the breaker must force the arc out magnetically. This unit is rated to interrupt a 10 kA prospective fault current at 440 V DC — sufficient for most 400 V DC drives, UPS, and railway auxiliary supplies. The maximum DC voltage of 500 V gives headroom on a 440 V nominal rail. For a 20 A DC circuit feeding control transformers, solenoids, or resistive heater banks, B is appropriate.
Siemens 5SY5220-6CC11 SENTRON MCB, 2P B 20A DC 440V
MPN5SY5220-6CC11
Siemens SENTRON 5SY5220-6CC11 miniature circuit breaker, 2-pole, B-curve, 20 A, DC 440 V, 10 kA per IEC 60947-2, for railway applications.
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Jul 2026
Specifications
| Parameter | Value |
|---|---|
| Product designation | Miniature circuit breaker |
| Brand name | SENTRON |
| Parameter | Value |
|---|---|
| Number of poles | 2 |
| Parameter | Value |
|---|---|
| Tripping characteristic class | B |
| Overvoltage category | III |
| Parameter | Value |
|---|---|
| Width | 36 mm |
| Height | 90 mm |
| Depth | 76 mm |
| Installation depth | 70 mm |
| Mounting position | any |
| Protection degree (IP) | IP20, with connected conductors |
Product details
Frequently asked questions
What is the wire range for the terminals on 5SY5220-6CC11?
Solid and stranded conductors from 0.75 mm² up to 35 mm². Tightening torque 2.5–3.5 N·m.
MPN
5SY5220-6CC11