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Siemens 5SJ4108-7HG42 1-Pole Circuit Breaker

Siemens 5SJ4108-7HG42 1-pole, C-curve, 8A Circuit Breaker.

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ManufacturerSiemens

Part number5SJ4108-7HG42

Poles 1

Current Rating 8A

Trip Curve C

Breaking Capacity 10kA

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Veteran-owned

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10kA interrupting capacity C-curve tripping UL 489 listed for 277V Single pole design Robust construction Compact

Product description

The Siemens 5SJ4108-7HG42 is a robust miniature circuit breaker engineered for reliable circuit protection in demanding environments. This single-pole unit features a C-curve tripping characteristic, an 8A current rating, and a 10kA interrupting capacity. It is specifically listed under UL 489 for 277V applications, ensuring high performance and safety.

This breaker is suitable for a wide range of applications where reliable overcurrent protection is crucial, including industrial machinery, control systems, and commercial power distribution. The C-curve offers good protection against overloads while handling moderate inrush currents common in inductive loads.

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Technical specifications

Poles	1
Current Rating	8A
Trip Curve	C
Breaking Capacity	10kA
Voltage Rating	277V AC
Standard	UL 489

Common applications

Industrial machinery

Control panels

Power distribution

Lighting circuits

Commercial facilities

Electrical safety

Compatible systems

Industrial control panels Building electrical systems Machinery enclosures

Also known as

Siemens 5SJ4 C8 277V Breaker 5SJ4108 C8 10kA Siemens 1-pole 8A UL 489

Replaces / compatible with

This breaker replaces older Siemens 5SJ4 series models with identical specifications. It is also a suitable replacement for other manufacturers' breakers meeting UL 489 277V requirements.

Technical note

Expert tip

The 277V rating on the 5SJ4108-7HG42 makes it particularly useful for systems utilizing higher voltage branch circuits common in North American industrial and commercial settings.

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Frequently asked questions

What is the intended use for a C-curve breaker like the Siemens 5SJ4108-7HG42?

The Siemens 5SJ4108-7HG42, with its C-curve, is designed for circuits that may experience moderate inrush currents, such as those with lighting or socket outlets. It provides enhanced protection against short circuits while allowing for temporary overcurrents that might occur during motor startup.