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Siemens 5SJ4318-8HG42 3-Pole 15A D-Curve Circuit Breaker UL 489

Siemens 5SJ4318-8HG42 3-pole 15A D-curve circuit breaker, 10kA, UL 489.

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ManufacturerSiemens

Part number5SJ4318-8HG42

Voltage 480Y/277V AC

Current 15A

Poles 3

Tripping Curve D

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3-pole protection D-curve for high inrush 10kA breaking capacity UL 489 listed Suitable for 480Y/277V Motor protection focused

Product description

The Siemens 5SJ4318-8HG42 is a 3-pole circuit breaker designed for industrial applications with high inrush current demands, such as motor starting. It features a 15A rated current, a D-curve tripping characteristic for handling these surges, and a 10kA breaking capacity. This breaker is UL 489 listed and suitable for systems operating at 480Y/277V.

This circuit breaker is an excellent choice for protecting motors, transformers, and other inductive loads in industrial environments where reliable startup and overcurrent protection are critical. The D-curve ensures that temporary high currents during motor start-up do not cause nuisance tripping, while still providing safety against sustained overloads and short circuits.

Stanlo Automation, a veteran-owned distributor of surplus industrial automation parts, offers the Siemens 5SJ4318-8HG42. We provide a dependable source for essential components, ensuring your industrial operations benefit from quality parts and efficient service to maintain peak performance.

Technical specifications

Voltage	480Y/277V AC
Current	15A
Poles	3
Tripping Curve	D
Breaking Capacity	10kA
Standard	UL 489

Common applications

Industrial motor control

Machinery protection

Transformer circuits

High inrush current applications

480V electrical systems

Control panels

Compatible systems

Standard DIN rail mounting systems

Also known as

Siemens 5SJ4318-8HG42 breaker Siemens 480V D-curve breaker 3-pole 15A motor circuit breaker

Replaces / compatible with

This breaker can replace other Siemens 5SJ4 series circuit breakers with similar 15A D-curve ratings and voltage specifications. Confirm compatibility for your specific application.

Technical note

Expert tip

The D-curve's time-delay feature is essential for preventing premature tripping during motor start-up, ensuring reliable operation of inductive loads.

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Frequently asked questions

What is the typical application for a Siemens 5SJ4318-8HG42 circuit breaker?

The Siemens 5SJ4318-8HG42 is a 15A, 3-pole circuit breaker with a D-curve, designed for 480Y/277V systems and a 10kA breaking capacity. It's ideal for protecting motors and other loads with high inrush currents.