Siemens 5SJ4310-7HG42 Miniature Circuit Breaker
The 5SJ4310-7HG42 is a Siemens 5SJ4 series DIN-rail-mounted thermal-magnetic MCB.
Key Specifications
| Parameter | Value |
|---|---|
| Current Rating | 10A |
| Poles | 3 |
| Voltage | 480/277V AC (max per UL/CSA) |
| Mounting | DIN Rail |
| Actuation | Lever |
| Breaking Capacity | 10kA |
| Trip Characteristic | C-curve |
| Illumination | None |
| Approval | CCC, CE, CSA, EAC, UL, VDE |
| RoHS | Non-compliant |
| Encapsulation | Bulk |
| Product Status | Active |
The 5SJ4 series uses a C-curve trip characteristic, suitable for predominantly resistive loads with moderate inrush such as transformers and motors.
Engineering Verification Checklist
- Confirm system voltage does not exceed 480V line-to-neutral for UL/CCC/CSA compliance
- Verify load current is ≤10A and within C-curve instantaneous trip band (5–10× In)
- Check panel or enclosure DIN rail clearances accommodate 54mm width per pole
- Validate coordination with upstream protective device given 10kA breaking capacity
- Confirm downstream short-circuit protection is present; this unit protects but does not isolate downstream fault alone
- Verify lever actuator is accessible for manual reset after fault trip
- Assess suitability for environments requiring CSA, UL, CCC, or VDE listings
- Confirm grounding and bonding connections per applicable standard (NEC, CEC, or IEC)
- Review load type compatibility; C-curve not recommended for purely inductive loads without coordination study