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Siemens 5SJ4 10kA Circuit Breaker - 2-Pole, D-Curve, 5A

Siemens 5SJ4 2-pole circuit breaker, 5A, D-curve, 10kA, UL 489.

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ManufacturerSiemens

Part number5SJ4211-8HG42

Poles 2

Rated Current 5A

Tripping Curve D

Breaking Capacity 10kA

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2-pole design D-curve tripping characteristic 10kA breaking capacity UL 489 listed 5A rated current High inrush current handling

Product description

The Siemens 5SJ4211-8HG42 is a 2-pole miniature circuit breaker designed with a D-curve tripping characteristic, ideal for circuits that experience high inrush currents. It has a rated current of 5A and a breaking capacity of 10kA, providing robust protection. This UL 489 listed breaker is suitable for 480Y/277V AC applications.

This circuit breaker is particularly useful for protecting small motors, transformers, and other inductive loads that have high starting current demands. The D-curve allows for these temporary surges without nuisance tripping, while still offering reliable protection against short circuits.

Stanlo Automation, your veteran-owned surplus industrial automation parts distributor, offers the Siemens 5SJ4211-8HG42. We provide competitive pricing and dependable access to quality components to keep your operations running efficiently.

Technical specifications

Poles	2
Rated Current	5A
Tripping Curve	D
Breaking Capacity	10kA
Voltage Rating	480Y/277V AC
Standard	UL 489

Common applications

Small motor protection

Transformer protection

Industrial machinery

High starting current loads

Control panels

Compatible systems

480Y/277V AC systems UL 489 compliant installations Motor control circuits

Also known as

Siemens 5SJ4 D-curve 5A 10kA breaker 5SJ4211-8HG42 breaker Siemens 480V D-curve 5A

Replaces / compatible with

This breaker is suitable for replacing older Siemens 5SJ series breakers or other UL 489 compliant 2-pole, 5A, D-curve circuit breakers.

Technical note

Expert tip

When selecting a D-curve breaker for motor protection, always verify that the breaker's trip curve is appropriately sized for the motor's specific starting characteristics.

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Frequently asked questions

Why choose a D-curve breaker like the 5SJ4211-8HG42 for specific applications?

The D-curve on the Siemens 5SJ4211-8HG42 is chosen for applications with high inrush currents, such as small motors or transformers. It allows for these transient surges (10-20x rated current) without tripping, ensuring reliable operation during motor startup.