Siemens 5SJ42188HG41 Miniature Circuit Breaker
Series and MPN decode
The MPN prefix 5SJ4 places this device in Siemens' 5SJ4 MCB family — two-pole, DIN-rail-mounted thermal-magnetic breakers for branch protection. In the Siemens catalog nomenclature, the digit after the series code (the "2" in 5SJ42…) indicates the pole count, while the numeric block that follows encodes the current rating and interruption capacity. The suffix HG41 identifies the D-curve magnetic trip characteristic and a specific voltage/interruption class.
5SJ42188HG41 specifications
| Parameter | Value |
|---|---|
| Current rating | 15 A |
| Poles | 2 |
| Actuator | Lever |
| Mounting | DIN Rail |
| Illumination | None |
| Encapsulation / package | Bulk |
| Approvals | CCC, CE, CSA, EAC, UL, VDE |
| Product status | Active |
| RoHS compliance | Non-compliant |
The D-curve trip characteristic provides a magnetic pickup band roughly 10–20× nominal current, suited for circuits with inductive load inrush. Bulk packaging indicates a standard industrial trade pack.
Similar catalog parts (screening only)
In-catalog peers share the same 5SJ4 series, two-pole layout, 15 A rating, lever actuation, and DIN-rail mounting. All require the user's own qualification.
| Parameter | 5SJ42188HG41 | 5SJ4218-8HG42 | 5SJ42187HG41 | 5SJ4218-7HG42 |
|---|---|---|---|---|
| Current (A) | 15 | 15 | 15 | 15 |
| Poles | 2 | 2 | 2 | 2 |
| Mounting | DIN Rail | DIN Rail | DIN Rail | DIN Rail |
| Illumination | None | None | None | None |
| Approvals | CCC, CE, CSA, EAC, UL, VDE | CCC, CE, CSA, EAC, UL, VDE | CCC, CE, CSA, EAC, UL, VDE | CCC, CE, CSA, UL, VDE |
| Similarity | — | 1.00 | 0.88 | 0.88 |
- 5SJ4218-8HG42 (similarity 1.00): same Siemens 5SJ4 series, 15 A two-pole, lever, bulk pack. Shares all recorded specs; differs in encoded voltage/interruption class per suffix.
- 5SJ42187HG41 (similarity 0.88): same mechanical form, mounting, and 15 A rating. C-trip (5–10× nominal) rather than D-trip; encoded voltage class differs per suffix.
- 5SJ4218-7HG42 (similarity 0.88): same Siemens series, 15 A two-pole, bulk pack. C-trip characteristic and a different voltage/interruption class; the approval list lacks EAC.
FAQ
What does the D-trip characteristic mean for 5SJ42188HG41? D-curve magnetic tripping activates in the 10–20× nominal current band. This suits circuits with moderate inductive inrush (small motors, transformers) that exceed C-curve thresholds.
What mounting does 5SJ42188HG41 use? Standard 35 mm DIN Rail, side-profile clip mounting typical of the Siemens 5SJ4 series.
Is 5SJ42188HG41 suitable as a branch protective device? It carries CCC, CE, CSA, EAC, UL, and VDE approvals. Final coordination and selectivity within a specific installation must be verified by the responsible engineer.