The 5SJ6520-7KS is a 1P+N SENTRON miniature circuit breaker rated 20 A with a C-curve tripping characteristic — magnetic trip between 5× and 10× In, so it handles moderate inrush from lighting or small motor loads without nuisance trips. Breaking capacity is 6 kA per both EN 60898 and IEC 60947-2, meaning it can safely interrupt a fault current up to 6 kA at 230 V AC without welding its contacts. The neutral pole switches simultaneously with the phase, which is required for single-phase final subcircuits where you need to isolate both conductors for safe maintenance.
Siemens 5SJ6520-7KS SENTRON MCB, 1P+N, C-curve, 20 A, 6 kA
MPN5SJ6520-7KS
Active
Siemens SENTRON 5SJ6 miniature circuit breaker, 1-pole+N, C-curve, 20 A, 6 kA acc. to EN 60898, 230 V AC, 2 MW, screwless terminals.
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 | 2 |
| Application suitability | Residential buildings/infrastructure |
| Parameter | Value |
|---|---|
| Tripping characteristic class | C |
| Rated value (EN 60898) | 6 kA |
| Energy limitation class | 3 |
| Overvoltage category | 3 |
| Parameter | Value |
|---|---|
| Mounting position | any |
| Width | 36 mm |
| Height | 90 mm |
| Depth | 76 mm |
| Installation depth | 70 mm |
| Modular width units | 2 |
| 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 breaking capacity of 5SJ6520-7KS?
6 kA rated per both EN 60898 and IEC 60947-2 at 230 V AC. That covers the fault-current duty of most residential and light-commercial distribution boards.
Does 5SJ6520-7KS switch the neutral?
Yes, it is a 1P+N design with neutral conductor switching. Both phase and neutral poles open simultaneously, isolating the load completely for safe maintenance.
What terminals does the 5SJ6520-7KS use?
Screwless (push-in) outgoing terminals. No screwdriver required for solid or ferruled stranded conductors — speeds wiring in repetitive panel builds.
Where can I buy 5SJ6520-7KS and what is the lead time?
This part is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for the current supply posture.
Will 5SJ6520-7KS fit a panel designed for 5SL6550-7BB?
Yes — both are 2 MW wide (36 mm), same 76 mm depth, same DIN-rail mounting. The 5SJ6520-7KS is rated 20 A C-curve; the 5SL6550-7BB is 50 A C-curve. If the panel busbar and load wiring are sized for 50 A, dropping in a 20 A MCB is fine. If you need the higher ampacity, stay with the 5SL series.
MPN
5SJ6520-7KS