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Siemens 5SJ4318-8HG41 3-Pole 15A Miniature Circuit Breaker D-Curve

Siemens 5SJ4318-8HG41 3-pole 15A Miniature Circuit Breaker, D-curve.

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ManufacturerSiemens

Part number5SJ4318-8HG41

Voltage 240V

Current 15A

Poles 3

Tripping Curve D

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3-pole protection D-curve for high inrush 14kA breaking capacity UL 489 listed 70mm width Motor protection optimized

Product description

The Siemens 5SJ4318-8HG41 is a 3-pole miniature circuit breaker featuring a D-curve tripping characteristic, making it ideal for applications involving inductive loads like motors that experience high inrush currents. It offers a 15A rated current and a substantial 14kA breaking capacity at 240V, meeting UL 489 safety standards. The 70mm width ensures compatibility with standard electrical panels.

This breaker is extensively used in industrial settings for the protection of motors, transformers, and other equipment susceptible to transient current surges. Its D-curve provides enhanced protection for these types of loads, preventing nuisance trips while ensuring safety against overloads and short circuits.

Stanlo Automation, a veteran-owned supplier of surplus industrial automation parts, is your reliable source for the Siemens 5SJ4318-8HG41. We are committed to providing quality components and exceptional service to support your operational needs and minimize downtime.

Technical specifications

Voltage	240V
Current	15A
Poles	3
Tripping Curve	D
Breaking Capacity	14kA
Standard	UL 489
Width	70mm

Common applications

Motor protection

Industrial machinery

Automation systems

Transformer circuits

High inrush current loads

Power distribution

Compatible systems

Standard DIN rail mounting systems

Also known as

Siemens 5SJ4318-8HG41 breaker Siemens D-curve breaker 3-pole 15A motor breaker

Replaces / compatible with

This part can replace other Siemens 5SJ4 series breakers with similar 15A D-curve ratings and voltage specifications. Always confirm compatibility with your system.

Technical note

Expert tip

The D-curve is specifically engineered for inductive loads and provides a time delay for temporary high currents, protecting the circuit without tripping unnecessarily.

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Frequently asked questions

What is the primary benefit of the D-curve on the Siemens 5SJ4318-8HG41 breaker?

The Siemens 5SJ4318-8HG41's D-curve tripping characteristic is designed to withstand higher inrush currents, typically found in motors during startup, preventing nuisance tripping while still offering robust overcurrent protection up to 14kA.