Siemens
Siemens 5SJ4303-8HG42 3-Pole D-Curve Circuit Breaker — 3A 480Y/277V
Siemens 5SJ4303-8HG42 3-pole Miniature Circuit Breaker
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12-month warranty
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Same-day dispatch
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Worldwide delivery
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Veteran-owned
CAGE: 9NK75
3-pole protection
D-curve for high inrush
10kA interrupting rating
UL 489 certified
Motor circuit suitability
Robust design
Product description
The Siemens 5SJ4303-8HG42 is a 3-pole circuit breaker featuring a D-curve tripping characteristic and a 3A current rating. It has a breaking capacity of 10kA and complies with UL 489 standards for 480Y/277V applications.
This breaker is designed for applications with high inrush currents, such as motor starting circuits. The D-curve offers enhanced protection against nuisance tripping in these scenarios. It is suitable for industrial and commercial power distribution.
Stanlo Automation, your veteran-owned source for surplus automation parts, offers the Siemens 5SJ4303-8HG42. We ensure product availability and reliable service for your critical components.
Technical specifications
| Poles | 3 |
| Current Rating | 3A |
| Tripping Characteristic | D |
| Breaking Capacity | 10kA |
| Voltage Rating | 480Y/277V |
| Standard | UL 489 |
Common applications
Motor protection
Industrial control
Power distribution
High inrush current loads
Machinery circuits
Automation systems
Compatible systems
Industrial motor control centers
Variable frequency drive (VFD) input protection
Machine tool control panels
Also known as
Siemens 5SJ4303-8HG42 breaker
Siemens 3A D-curve 480V breaker
5SJ4 Series motor breaker
Replaces / compatible with
This part serves as a direct replacement for other Siemens 5SJ4 series circuit breakers with identical electrical and physical specifications.
Technical note
Expert tip
The Siemens 5SJ4303-8HG42 is ideal for direct-on-line (DOL) motor starting applications due to its D-curve design, which allows for significant temporary overcurrents.What happens next?
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Frequently asked questions
Why choose a D-curve breaker like the Siemens 5SJ4303-8HG42 for motor circuits?
The D-curve characteristic of the Siemens 5SJ4303-8HG42 allows it to withstand higher inrush currents commonly experienced during motor startup. This prevents nuisance tripping that can occur with standard B or C curve breakers, ensuring reliable operation of motor-driven equipment.