Siemens 5SJ4104-7HG42 Miniature Circuit Breaker
5SJ4 Series Single-Pole MCB Specifications
| Specification | Value |
|---|---|
| Manufacturer | Siemens |
| Series | 5SJ4 |
| Poles | 1 |
| Current Rating | 4A |
| Voltage (UL489) | 277V AC |
| Voltage (IEC/EN) | 240V AC |
| Interrupting Capacity | 10kA |
| Trip Characteristic | C (5–10× In) |
| Mounting | DIN Rail |
| Actuator | Lever |
| Illumination | None |
| RoHS Status | Non-compliant |
| Package | Bulk |
| Product Status | Active |
C-curve devices trip between 5× and 10× nominal current, suitable for protective circuits with moderate inrush such as transformers or low-power motors. The 10kA interrupt rating meets UL489 branch-circuit requirements.
Comparison Against Siemens 5SJ4 Family Alternates
The reader must verify alternate suitability independently; similarity scores reflect parametric proximity only and do not indicate interchangeability or equivalent safety certification.
| Spec | 5SJ4104-7HG42 (seed) | 5SJ4104-7HG40 | 5SJ4104-7HG41 | 5SJ4104-8HG42 |
|---|---|---|---|---|
| Poles | 1 | 1 | 1 | 1 |
| Current | 4A | 4A | 4A | 4A |
| Voltage (UL) | 277V | 240V | 240V | 277V |
| Interrupt | 10kA | 14kA | 14kA | 10kA |
| Trip | C | C | C | D |
| Mount | DIN Rail | DIN Rail | DIN Rail | DIN Rail |
| Similarity | — | 1.0 | 1.0 | 1.0 |
5SJ4104-7HG40 and 5SJ4104-7HG41 share the same 4A rating and C-curve characteristic; the voltage rating drops to 240V UL but interrupting capacity rises to 14kA—relevant for panels requiring higher fault tolerance.
5SJ4104-8HG42 differs only in D-curve tripping (10–20× In), appropriate for inductive loads with higher startup currents; voltage and current remain identical.
The remaining alternates (5SJ4104-8HG40, 5SJ4104-8HG41, 5SJ4106-7HG42, 5SJ4105-7HG42, 5SJ4103-7HG42) vary in current rating (3A, 6A, 500mA) or combine D-curve with 14kA ratings.