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Siemens 5SJ4111-8HG42 1-Pole 5A D-Curve Circuit Breaker

Siemens 5SJ4111-8HG42 1-pole, 5A, D-curve miniature circuit breaker.

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ManufacturerSiemens

Part number5SJ4111-8HG42

Poles 1

Current Rating 5A

Breaking Capacity 10kA

Curve Type D

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10kA interrupting rating D-curve tripping for high inrush 5A rated current 277V AC UL 489 listing Single-pole design Motor and transformer protection

Product description

The Siemens 5SJ4111-8HG42 is a 1-pole miniature circuit breaker featuring a D-curve tripping characteristic, optimized for circuits with high inrush currents. It is rated for 5 A and has a short-circuit breaking capacity of 10 kA. This breaker is UL 489 listed for use up to 277V AC.

This circuit breaker is ideal for protecting inductive loads such as motors, transformers, and solenoids, where substantial inrush currents occur during startup. The D-curve provides the necessary tolerance for these transient surges, preventing nuisance tripping while ensuring protection against overloads and short circuits. Applications include industrial machinery and power distribution.

Stanlo Automation, a veteran-owned supplier of surplus industrial automation parts, offers the Siemens 5SJ4111-8HG42. We are dedicated to providing quality surplus components to help you maintain operational efficiency and meet project deadlines with reliable and cost-effective solutions.

Technical specifications

Poles	1
Current Rating	5A
Breaking Capacity	10kA
Curve Type	D
Voltage Rating	277V AC
Standard	UL 489

Common applications

Industrial control panels

Motor control

Transformer protection

Solenoid circuits

Machine protection

Electrical distribution

Compatible systems

UL 489 rated systems up to 277V AC, suitable for motor loads

Also known as

Siemens 5SJ4 D-curve 5SJ4 Series 5A D Miniature circuit breaker 5A D

Replaces / compatible with

This part is a Siemens 5SJ4 series circuit breaker and is generally compatible with other Siemens miniature circuit breakers of similar specifications and physical dimensions within the same series.

Technical note

Expert tip

The 5SJ4111-8HG42 is suitable for AC circuits up to 277V and is not designed for DC applications.

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Frequently asked questions

What is the function of the D-curve on the Siemens 5SJ4111-8HG42 circuit breaker?

The D-curve on the 5SJ4111-8HG42 is designed to handle high inrush currents typical of inductive loads like motors. It allows for these momentary current spikes (typically 10-20 times the rated current) without tripping, while still providing protection against sustained overloads and short circuits.