Siemens 5SJ42188HG41 Miniature Circuit Breaker
DIN Rail Protection: 15 A Two-Pole MCB
The Siemens 5SJ4 series MCB provides two-pole overload and short-circuit protection on a standard 35 mm DIN rail. The 5SJ42188HG41 carries a D-curve tripping characteristic (10–20× instantaneous trip) suitable for inductive motor circuits and transformer inrush loads.
| Parameter | Value |
|---|---|
| Current Rating | 15 A |
| Poles | 2 |
| Mounting | DIN Rail |
| Actuator | Lever |
| Illumination | None |
| Package | Bulk |
| Product Status | Active |
| RoHS | Non-compliant |
Agency coverage listed in catalog records: CCC, CE, CSA, EAC, UL, VDE. No explicit voltage rating is present in the supplied record; the title shows "240V".
5SJ4 Series Context
The "5SJ4" prefix identifies this family within the Siemens industrial miniature circuit breaker range. Trip curves are encoded in the suffix: "D" denotes D-curve (high instantaneous trip band), while "C" denotes C-curve (moderate instantaneous trip band). Users selecting D-curve devices should confirm the inrush tolerance of the downstream load matches the 10–20× trip band.
Similar Catalog Parts
The following entries share identical form factor, pole count, mounting, and current rating with variation in voltage rating or trip curve only. All require independent qualification before use.
| MPN | Voltage (title) | Trip Curve | Similarity |
|---|---|---|---|
| 5SJ42188HG41 | 240V | D | Primary |
| 5SJ4218-8HG42 | 480/277V | D | 1.0 |
| 5SJ42187HG41 | 240V | C | 1.0 |
| 5SJ4218-7HG42 | 480/277V | C | 1.0 |
Why 5SJ4218-8HG42 is similar: Same Siemens 5SJ4 family, identical 15 A rating, two-pole configuration, and DIN rail mounting. The voltage rating differs (480/277 V vs 240 V) — a parameter not specified for the seed.
Why 5SJ42187HG41 is similar: Same Siemens 5SJ4 family, identical 15 A rating and two-pole DIN rail mounting. The trip curve differs: C-curve (5–10× instantaneous) versus D-curve (10–20×). Both are Bulk packaged.
Why 5SJ4218-7HG42 is similar: Same Siemens 5SJ4 family with 15 A, two-pole, DIN rail mounting. Combines the higher 480/277 V rating with C-curve trip characteristic — a different voltage and a different instantaneous trip band versus the seed.
Engineering Verification Checklist
- Load inrush current profile matches D-curve 10–20× trip band
- System voltage falls within the device's voltage rating for the intended installation
- Two-pole configuration selected for ungrounded conductors or branch protection
- DIN rail enclosure clearance accommodates lever actuation and cable termination
- Downstream coordination with upstream overcurrent device confirmed
- Applicable agency certifications match installation jurisdiction
- RoHS non-compliant status acceptable for installation region