SIEMENS
SIEMENS 5SJ41058HG40 IEC Miniature Circuit Breaker 0.5A 1 Pole D Curve 240V AC 60V DC 14kA DIN Rail
Provides 0.5 A single-pole branch-circuit protection with D-curve thermal-magnetic trip, 14 kA interrupting at 240 V AC and 60 V DC, DIN-rail mount, screw-clamp terminals for 14–4 AWG wire
- 5 A rating protects sensitive branch circuits
- D-curve trip handles high inrush loads without nuisance trips
- 14 kA breaking capacity clears heavy fault currents safely
- DIN-rail mount fits standard industrial panels
- Screw-clamp terminals accept 14–4 AWG wire securely
Industrial branch protection
The Siemens 5SJ41058HG40 is a single-pole miniature circuit breaker rated at 0.5 A for 240 V AC and 60 V DC branch circuits. It uses a D-curve thermal-magnetic trip and a 14 kA interrupting rating to protect industrial control panels and reverse-feed applications. Builders needing multi-pole or higher-current devices must look elsewhere.
Thermal-magnetic response
The thermal-magnetic mechanism reacts to sustained overloads and short-circuit currents without external power. In normal operation the breaker dissipates only the losses of its 0.5 A load current and runs silently on the DIN rail. No fan, heatsink or active cooling is required.
Screw-clamp wiring range
Screw-clamp terminals accept conductors from 14 AWG up to 4 AWG, allowing a wide range of field wiring without special tools. The 63 A frame size and UL 489 listing confirm suitability for standard industrial panel builds. No software or configuration accessories are included.
Highlights
- 5 A rating protects sensitive branch circuits
- D-curve trip handles high inrush loads without nuisance trips
- 14 kA breaking capacity clears heavy fault currents safely
- DIN-rail mount fits standard industrial panels
- Screw-clamp terminals accept 14–4 AWG wire securely
Specifications
| Brand | SIEMENS |
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Questions about this item
How do I mount the 5SJ4 breaker on a DIN rail and what step is often missed?
Snap the 1-pole housing onto the DIN rail, then secure the screw-clamp terminals on 14 AWG to 4 AWG copper wire; the step often missed is confirming the clamp is fully tightened on each conductor.
What maintenance or replacement will the 0.5 A D-curve breaker need over time?
The thermal-magnetic mechanism is not serviceable; replace the unit if it trips at or below the 0.5 A rating or after a 14 kA fault event.
What limit appears first when the breaker runs continuously at 0.5 A in a 240 V AC panel?
The 63 A frame thermal limit governs sustained loading; the D-curve magnetic trip only operates on short-circuit currents well above the 0.5 A rating.
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