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Siemens 5SJ4120-7HG42 1-Pole C-Curve Circuit Breaker - 20A

Siemens 5SJ4120-7HG42 1-pole, C-curve, 20A circuit breaker.

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ManufacturerSiemens

Part number5SJ4120-7HG42

Type Miniature Circuit Breaker

Poles 1

Current Rating 20 A

Tripping Characteristic C

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1-pole design C-curve tripping 10kA interrupting capacity UL 489 listed 20A rating

Product description

The Siemens 5SJ4120-7HG42 is a 1-pole miniature circuit breaker featuring a C-curve tripping characteristic and a 20A current rating. It provides a 10kA breaking capacity and is compliant with UL 489 standards for use at 277V.

This circuit breaker is designed for reliable overcurrent and short-circuit protection in various industrial and commercial applications. The C-curve is ideal for circuits with moderate inrush currents, commonly found in control circuits and lighting systems.

Stanlo Automation, a veteran-owned business specializing in surplus industrial automation parts, offers the Siemens 5SJ4120-7HG42. We provide high-quality, tested components to help you complete your automation projects cost-effectively and efficiently.

Technical specifications

Type	Miniature Circuit Breaker
Poles	1
Current Rating	20 A
Tripping Characteristic	C
Breaking Capacity	10 kA
Voltage Rating	277V AC
Standard	UL 489

Common applications

Industrial control panels

Commercial electrical distribution

Motor protection

Lighting circuits

HVAC systems

Compatible systems

Control panels Distribution boards Electrical enclosures

Also known as

Siemens 5SJ4120-7HG42 5SJ4 Series circuit breaker

Replaces / compatible with

This part is a direct replacement for other Siemens 5SJ4 series breakers with similar specifications. Consult the manufacturer's documentation for exact compatibility.

Technical note

Expert tip

The 277V AC rating is important for specific electrical systems, particularly in North America, where this voltage is common for lighting and branch circuits.

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Frequently asked questions

What is the breaking capacity of the Siemens 5SJ4120-7HG42 circuit breaker?

The Siemens 5SJ4120-7HG42 circuit breaker has a short-circuit breaking capacity of 10kA. This rating indicates its ability to safely interrupt fault currents up to this level, ensuring the protection of electrical systems and personnel.