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Siemens 5SJ4320-8HG42 3-Pole D-Curve Circuit Breaker

Siemens 5SJ4320-8HG42 3-pole D-curve Circuit Breaker

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ManufacturerSiemens

Part number5SJ4320-8HG42

Type Circuit Breaker

Poles 3

Rated Current 20A

Tripping Characteristic D

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Veteran-owned

CAGE: 9NK75

3-pole protection D-curve tripping for high inrush 10kA interrupting rating UL 489 listed Suitable for motor loads

Product description

The Siemens 5SJ4320-8HG42 is a 3-pole circuit breaker featuring a D-curve tripping characteristic, ideal for protecting circuits with high inrush currents, such as motors. It has a rated current of 20A and a breaking capacity of 10kA at 480Y/277V, meeting UL 489 standards for safety and reliability.

This breaker is particularly suited for motor protection applications, power supplies, and circuits with large transformers or capacitive loads that experience significant inrush current. Industries that benefit from this D-curve breaker include manufacturing, machine building, and automation systems.

Stanlo Automation, a veteran-owned supplier of surplus industrial automation parts, provides the Siemens 5SJ4320-8HG42. We aim to help businesses reduce costs and prevent production interruptions by offering quality used and surplus components. Partner with Stanlo for your automation spare parts needs.

Technical specifications

Type	Circuit Breaker
Poles	3
Rated Current	20A
Tripping Characteristic	D
Breaking Capacity	10kA @ 480Y/277V
Standard	UL 489

Common applications

Motor protection

Circuits with high inrush

Transformers

Machine building

Manufacturing

Automation

Compatible systems

Standard DIN rail mounting.

Also known as

Siemens 5SJ4320-8HG42

Replaces / compatible with

This D-curve breaker is suitable for replacing Siemens or other manufacturers' 3-pole, 20A breakers designed for high inrush current applications.

Technical note

Expert tip

The D-curve offers a time delay for inrush currents up to 10-20 times the rated current, protecting motors without nuisance tripping.

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Frequently asked questions

What type of loads is the Siemens 5SJ4320-8HG42 circuit breaker best suited for?

The Siemens 5SJ4320-8HG42 features a D-curve tripping characteristic, making it ideal for circuits with high inrush currents, such as those powering motors, transformers, or large capacitor banks.