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Siemens 5SJ4118-7HG40 1-Pole C-Curve Miniature Circuit Breaker - Equal Polarity

Siemens 5SJ4118-7HG40 1-Pole C-Curve Circuit Breaker

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ManufacturerSiemens

Part number5SJ4118-7HG40

Voltage 240V AC

Current 15A

Poles 1

Breaking Capacity 14kA

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1-pole protection C-curve tripping 14kA interrupting rating UL 489 listed Equal polarity feature

Product description

The Siemens 5SJ4118-7HG40 is a 1-pole miniature circuit breaker featuring a C-curve tripping characteristic for reliable overcurrent protection. It is rated for 15A, with a substantial breaking capacity of 14kA at 240V AC, and is UL 489 listed. This model also includes an 'equal polarity' feature, ensuring synchronized operation across multiple poles in a panel.

This circuit breaker is suitable for general branch circuit protection in residential, commercial, and light industrial applications. Its C-curve is appropriate for circuits with moderate inductive loads, such as lighting, outlets, and small motor loads. The equal polarity design enhances safety and reliability in multi-pole assemblies.

Stanlo Automation, a veteran-owned supplier of surplus industrial automation parts, provides the Siemens 5SJ4118-7HG40. We are dedicated to offering high-quality, tested components to keep your systems running smoothly. Choose Stanlo Automation for your electrical protection needs and benefit from our expertise and reliable service.

Technical specifications

Voltage	240V AC
Current	15A
Poles	1
Breaking Capacity	14kA
Tripping Curve	C
Standard	UL 489
Polarity	Equal

Common applications

Residential distribution panels

Commercial building wiring

Light industrial circuits

General purpose branch circuits

Outlet and lighting circuits

Compatible systems

UL 489 compliant electrical panels Residential and commercial distribution General purpose branch circuits

Also known as

Siemens 5SJ4 15A breaker 1-pole C-curve breaker Siemens equal polarity circuit breaker

Replaces / compatible with

This part can replace older Siemens 5SJ4 series breakers with 15A, 1-pole, C-curve, 240V, and UL 489 ratings. It is designed for compatibility within UL 489 compliant electrical distribution systems.

Technical note

Expert tip

When used in multi-pole configurations, the equal polarity design ensures consistent and safe switching across all protected phases.

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Frequently asked questions

What is the significance of 'equal polarity' in the Siemens 5SJ4118-7HG40 circuit breaker?

The 'equal polarity' feature ensures that all poles in a multi-pole breaker assembly switch simultaneously. This is crucial for safety, especially in three-phase systems, guaranteeing that all phases are disconnected together during a fault or for maintenance.