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Siemens 5SJ4 2-Pole Miniature Circuit Breaker – 3A, D-Curve

Siemens 5SJ4203-8HG42 2-pole Miniature Circuit Breaker

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ManufacturerSiemens

Part number5SJ4203-8HG42

Rated Current 3A

Poles 2

Trip Curve D

Breaking Capacity 10kA

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2-pole protection D-curve tripping 10kA breaking capacity UL 489 listed High inrush current handling

Product description

The Siemens 5SJ4203-8HG42 is a 2-pole miniature circuit breaker engineered for applications requiring high inrush current handling. It features a D-curve tripping characteristic and a 3A rated current, with a breaking capacity of 10kA. This breaker is UL 489 listed for use up to 480Y/277V, offering robust protection in demanding industrial environments.

This circuit breaker is ideal for protecting circuits with substantial inductive loads, such as large motors, transformers, and solenoid-controlled equipment. It is frequently employed in industrial machinery, power distribution systems, and heavy-duty electrical installations where significant starting currents are expected.

Stanlo Automation, a veteran-owned supplier, offers the Siemens 5SJ4203-8HG42, providing reliable surplus industrial automation parts. We are committed to delivering quality components at competitive prices with efficient service to support your operational continuity.

Technical specifications

Rated Current	3A
Poles	2
Trip Curve	D
Breaking Capacity	10kA
Voltage	480Y/277V AC
Standard	UL 489

Common applications

Motor Circuits

Transformer Protection

Industrial Machinery

Heavy Duty Equipment

Power Distribution

Compatible systems

Standard distribution panels DIN rail mounting systems Control enclosures Motor control circuits

Also known as

Siemens 5SJ4 D-curve 3A 5SJ42038HG42 Siemens 2 pole D-curve breaker Siemens 10kA industrial breaker

Replaces / compatible with

This breaker is a direct replacement for other Siemens 5SJ4 series circuit breakers with identical specifications, especially where D-curve protection is required. It is designed for standard DIN rail mounting.

Technical note

Expert tip

The D-curve's ability to tolerate inrush currents up to 10-20 times the rated current makes it essential for protecting circuits with heavy motor loads.

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Frequently asked questions

Why would I choose a D-curve breaker like the Siemens 5SJ4203-8HG42 for motor circuits?

The D-curve tripping characteristic of the Siemens 5SJ4203-8HG42 is specifically designed to handle the high inrush currents that occur when motors start. This prevents premature tripping, ensuring reliable operation while still offering protection against short circuits.