Siemens 5SJ4203-7HG42 Miniature Circuit Breaker
Key Specifications
| Parameter | Value |
|---|---|
| Current Rating | 3 A |
| Voltage | 480/277 V AC |
| Number of Poles | 2 |
| Mounting | DIN Rail |
| Actuator | Lever |
| Breaking Capacity | 10 kA |
| Trip Characteristic | C-TRI |
| Package | Bulk |
| Product Status | Active |
| RoHS Compliance | Non-compliant |
| Approvals | CCC, CE, CSA, EAC, UL, VDE |
Overview
The Siemens 5SJ4203-7HG42 is a 2-pole DIN rail-mounted miniature circuit breaker from the 5SJ4 series, rated at 3A with a C-TRI tripping characteristic suitable for 480/277 V AC systems. It carries multiple international certifications including CE, UL, and VDE, making it applicable for use across various global markets. The device features a lever actuator for manual operation and is packaged in bulk quantities.
The 5SJ4 family encompasses a broad range of current ratings within the same form factor, allowing panel designers to standardize on a common mounting and panel cutout approach when different branch ratings are required. The C-trip curve indicates moderate magnetic trip thresholds suitable for circuits with moderate inrush such as motor branch feeders or transformer-loaded circuits.
Catalog Comparison — In-Catalog Parts with Matching Voltage and Pole Configuration
| Spec | 5SJ4203-7HG42 | 5SJ4203-7HG41 | 5SJ4203-8HG42 |
|---|---|---|---|
| Current | 3 A | 3 A | 3 A |
| Voltage | 480/277 V | 240 V | 480/277 V |
| Poles | 2 | 2 | 2 |
| Mount | DIN Rail | DIN Rail | DIN Rail |
| Package | Bulk | Bulk | Bulk |
| RoHS | Non-compliant | Non-compliant | Non-compliant |
| Similarity | — | 1.0 | 1.0 |
Why These Parts Are Catalog-Neighbors
The primary part (5SJ4203-7HG42) shares its manufacturer, pole count, mounting method, current rating, and non-compliant RoHS status with both listed alternates. The 5SJ4203-7HG41 variant differs in its maximum voltage rating (240 V vs 480/277 V), which determines system voltage compatibility. The 5SJ4203-8HG42 shares the same voltage class but uses a D-trip characteristic, which raises the magnetic trip threshold compared to the C-curve primary part.
Additional Current Ratings in the 5SJ4 480/277 V Series
The same voltage and pole combination is cataloged with current ratings from 500 mA up to 8 A, all sharing the same DIN rail form factor, lever actuator, and bulk packaging:
- 500 mA — 5SJ4205-7HG42
- 1 A — 5SJ4201-7HG42
- 6 A — 5SJ4206-7HG42
- 8 A — 5SJ4208-7HG42
- 4 A — 5SJ4204-7HG42