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Siemens 5SJ4204-8HG42 2-Pole Circuit Breaker - 4A D-Curve

Siemens 5SJ4204-8HG42 2-pole, 4A circuit breaker, D-curve.

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ManufacturerSiemens

Part number5SJ4204-8HG42

Poles 2

Current Rating 4 A

Breaking Capacity 10 kA

Trip Curve D

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2-pole protection 10kA interrupting capacity D-curve tripping characteristic Ideal for inductive loads UL 489 certified

Product description

The Siemens 5SJ4204-8HG42 is a 2-pole circuit breaker featuring a D-curve trip characteristic, designed to handle high inrush currents common in inductive loads. It boasts a 10kA interrupting rating and is UL 489 listed for use in 480Y/277V AC systems.

This breaker is well-suited for protecting circuits powering motors, transformers, and other equipment that experiences significant temporary current surges during startup. The D-curve ensures that these normal inrush currents do not cause nuisance tripping, while still providing robust protection against overloads and short circuits.

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Technical specifications

Poles	2
Current Rating	4 A
Breaking Capacity	10 kA
Trip Curve	D
Voltage Rating	480Y/277V AC
Standard	UL 489

Common applications

Motor starting circuits

Transformer protection

Industrial control panels

Equipment with high inrush currents

Power distribution

Compatible systems

Standard DIN rail mounting systems

Also known as

Siemens 5SJ4 D-curve breaker 480V 4A circuit breaker Siemens 5SJ4204-8HG42 industrial breaker

Replaces / compatible with

Compatible with Siemens 5SJ series accessories.

Technical note

Expert tip

This breaker's D-curve characteristic makes it a preferred choice for protecting circuits feeding motors and transformers where significant inrush currents are typical during energization.

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Frequently asked questions

Why is the D-curve important for the Siemens 5SJ4204-8HG42 circuit breaker?

The D-curve on the Siemens 5SJ4204-8HG42 is crucial for applications with inductive loads, as it allows for higher inrush currents during startup without tripping, while still providing protection against overloads and short circuits.