Siemens 5SJ4202-7HG42 MCB Selection Guide
Engineering verification checklist
- Confirm system voltage (480Y/277V max) matches installed bus rating before mounting
- Verify 2A characteristic suits load inrush profile; C-curve covers ~5–10× In for 0.1–0.5 s
- Confirm 10 kA interrupt rating exceeds calculated prospective fault current at point of installation
- Check five agency marks (CCC, CE, CSA, UL, VDE) against local enforcement jurisdiction requirements
- Validate DIN rail enclosure clearance and busbar spacing per IEC/EN 60898-1
- Confirm RoHS non-compliant status is acceptable for installation region and procurement specification
- Verify two-pole interruption path provides common trip across line and neutral (if neutral protection required)
- Confirm bulk packaging quantity aligns with panel build lot size to avoid partial-quantity waste
5SJ4202-7HG42 family comparison
The reader must qualify all alternates independently against their specific installation requirements. The three closest parametric matches from the same 5SJ4 DIN-rail MCB family are shown below.
| Spec | 5SJ4202-7HG42 | 5SJ4202-7HG41 | 5SJ4202-8HG42 | 5SJ4203-7HG42 |
|---|---|---|---|---|
| Poles | 2 | 2 | 2 | 2 |
| Voltage (V) | 480Y/277 | 240 | 480Y/277 | 480Y/277 |
| Current (A) | 2 | 2 | 2 | 3 |
| Trip | C-curve | C-curve | D-curve | C-curve |
| Mount | DIN Rail | DIN Rail | DIN Rail | DIN Rail |
| Int. (kA) | 10 | 14 | 10 | 10 |
| Similarity | — | 1.00 | 1.00 | 1.00 |
Why similar: 5SJ4202-7HG41 differs only in voltage rating (240V single-phase vs 480Y/277V multi-phase) and interrupt rating (14kA vs 10kA); same 2A C-trip and DIN mount.
Why similar: 5SJ4202-8HG42 differs only in trip characteristic (D-curve ~10–20× In vs C-curve 5–10× In); same voltage, current, and 10kA rating make it the closest C→D variant within this MPN prefix.
Why similar: 5SJ4203-7HG42 matches voltage, poles, mounting, and trip type but steps current to 3A; useful for resizing within the same frame and certification set.