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Siemens 5SJ4108-8HG42 1-Pole Circuit Breaker

Siemens 5SJ4108-8HG42 1-pole, D-curve, 8A Circuit Breaker.

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ManufacturerSiemens

Part number5SJ4108-8HG42

Poles 1

Current Rating 8A

Trip Curve D

Breaking Capacity 10kA

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Veteran-owned

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10kA interrupting capacity D-curve tripping UL 489 listed for 277V Suitable for high inrush loads Single pole Robust

Product description

The Siemens 5SJ4108-8HG42 is a high-quality miniature circuit breaker designed for robust protection in demanding industrial applications. This single-pole unit features a D-curve tripping characteristic, an 8A current rating, and a 10kA interrupting capacity. It is UL 489 listed for 277V AC systems, offering superior safety and performance.

This circuit breaker is ideal for protecting circuits with high inrush currents, such as those powering motors, transformers, and other inductive loads. The D-curve provides delayed tripping for these surges, preventing nuisance trips while still offering excellent short-circuit protection.

Stanlo Automation, a veteran-owned provider of surplus industrial automation parts, offers the Siemens 5SJ4108-8HG42. We ensure reliable, tested components to support your operational needs and budget.

Technical specifications

Poles	1
Current Rating	8A
Trip Curve	D
Breaking Capacity	10kA
Voltage Rating	277V AC
Standard	UL 489

Common applications

Motor protection

Transformer circuits

Industrial machinery

Control panels

Power distribution

High inrush applications

Compatible systems

Motor control centers Industrial machinery Power distribution units

Also known as

Siemens 5SJ4 D8 Breaker 5SJ4108 D8 10kA Siemens 1-pole 8A D-curve

Replaces / compatible with

This breaker is designed to replace other Siemens 5SJ4 series circuit breakers with identical specifications. It is also compatible with other UL 489 listed breakers rated for 277V and 8A with a D-curve.

Technical note

Expert tip

The D-curve characteristic of the 5SJ4108-8HG42 ensures reliable operation for applications with significant starting currents, such as motor control circuits where B or C curves might trip prematurely.

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Frequently asked questions

When should I use a D-curve circuit breaker like the Siemens 5SJ4108-8HG42?

A D-curve circuit breaker, such as the Siemens 5SJ4108-8HG42, is recommended for protecting equipment with high inrush currents like motors, transformers, and welding equipment. It allows for higher temporary current surges during startup before tripping, preventing nuisance trips.