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

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

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ManufacturerSiemens

Part number5SJ4210-8HG42

Poles 2

Rated Current 10A

Tripping Curve D

Breaking Capacity 10kA

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

Product description

The Siemens 5SJ4210-8HG42 is a 2-pole miniature circuit breaker featuring a D-curve tripping characteristic, designed for circuits requiring protection against high inrush currents. It has a rated current of 10A and a breaking capacity of 10kA, making it suitable for demanding industrial applications. This UL 489 listed breaker is approved for use in 480Y/277V systems.

This circuit breaker is specifically suited for protecting motors, transformers, and other loads that experience significant temporary surges upon startup. The D-curve ensures reliable operation by allowing for higher inrush currents without premature tripping, while still offering robust short-circuit protection.

Stanlo Automation, a veteran-owned surplus industrial automation parts distributor, offers the Siemens 5SJ4210-8HG42. We provide cost-effective and reliable solutions, ensuring you have access to the quality components needed to maintain your operations.

Technical specifications

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

Common applications

Motor protection

Transformer protection

Industrial machinery

High starting current loads

Power distribution

Compatible systems

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

Also known as

Siemens 5SJ4 D-curve 10A 10kA breaker 5SJ4210-8HG42 breaker Siemens 480V D-curve

Replaces / compatible with

This breaker is suitable for replacing older Siemens 5SJ series breakers or other UL 489 compliant 2-pole, 10A, D-curve circuit breakers.

Technical note

Expert tip

For optimal performance with high-power motors, ensure the conductor sizing and breaker rating are coordinated according to motor starting current requirements.

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Frequently asked questions

What are the key benefits of the D-curve on the Siemens 5SJ4210-8HG42 circuit breaker?

The D-curve on the Siemens 5SJ4210-8HG42 allows it to handle high inrush currents, typically 10 to 20 times the rated current, which is essential for starting motors and other inductive loads. This prevents nuisance tripping while still providing effective overcurrent and short-circuit protection.