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

Siemens 5SJ4202-8HG42 2-pole Miniature Circuit Breaker

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ManufacturerSiemens

Part number5SJ4202-8HG42

Rated Current 2A

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 5SJ4202-8HG42 is a 2-pole miniature circuit breaker designed for high inrush current applications. It features a D-curve tripping characteristic and a 2A rated current, with a breaking capacity of 10kA. This breaker is UL 489 listed for use up to 480Y/277V, providing robust protection in demanding environments.

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

Stanlo Automation, a veteran-owned supplier, offers the Siemens 5SJ4202-8HG42, providing reliable surplus industrial automation parts. We ensure quality, competitive pricing, and efficient delivery to support your operational needs.

Technical specifications

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

Common applications

Motor Circuits

Transformer Protection

Heavy Machinery

Industrial Automation

Power Distribution

Compatible systems

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

Also known as

Siemens 5SJ4 D-curve breaker 5SJ42028HG42 Siemens 2A D-curve breaker Siemens 10kA industrial breaker

Replaces / compatible with

This breaker replaces other Siemens 5SJ4 series circuit breakers with identical specifications, particularly those requiring D-curve protection. It is designed for standard DIN rail mounting.

Technical note

Expert tip

The D-curve is essential for motor protection applications where starting currents can be 5-10 times the rated full load current.

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Frequently asked questions

What is the advantage of a D-curve breaker like the Siemens 5SJ4202-8HG42?

The D-curve tripping characteristic of the Siemens 5SJ4202-8HG42 allows it to withstand significantly higher inrush currents, typically experienced when starting motors or energizing transformers. This prevents nuisance tripping while still providing protection against short circuits.