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Siemens 5SJ4311-8HG42 3-Pole D-Curve Circuit Breaker 5A 10kA

Siemens 5SJ4311-8HG42 3-pole D-curve miniature circuit breaker.

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ManufacturerSiemens

Part number5SJ4311-8HG42

Poles 3

Current Rating 5A

Tripping Characteristic D

Interrupting Capacity 10kA

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3-pole design D-curve for high inrush 10kA interrupting capacity UL 489 listed Small motor protection

Product description

The Siemens 5SJ4311-8HG42 is a robust 3-pole miniature circuit breaker built for reliable protection. It features a D-curve tripping characteristic, a 5A rated current, and a 10kA interrupting capacity, safeguarding electrical circuits. This breaker is UL 489 listed for 480Y/277V applications.

This circuit breaker is ideal for protecting equipment that experiences high inrush currents, even at lower amperage ratings. Applications include small motors, transformers, or other inductive loads where the D-curve's delayed trip is essential to prevent nuisance tripping.

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Technical specifications

Poles	3
Current Rating	5A
Tripping Characteristic	D
Interrupting Capacity	10kA
Voltage Rating	480Y/277V AC
Standard	UL 489

Common applications

Small motor protection

Transformer protection

High inrush loads

Inductive loads

Control circuits

Compatible systems

UL 489 rated electrical panels 480Y/277V AC systems Small motor control circuits Equipment with high inrush current

Also known as

Siemens 5SJ4 D-curve 5A breaker 5SJ4 Series 3-pole D-curve Siemens 480V D-curve 5A

Replaces / compatible with

This breaker can replace older Siemens 3RV series or equivalent 3-pole, 5A, D-curve circuit breakers that meet UL 489 standards.

Technical note

Expert tip

The D-curve's trip mechanism activates at 10 to 20 times the rated current, ideal for loads with high transient current demands like small motors.

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Frequently asked questions

What makes the 5SJ4311-8HG42 suitable for protecting small motors?

The 5SJ4311-8HG42 features a D-curve tripping characteristic. This curve allows for higher inrush currents during motor startup, preventing nuisance tripping that could occur with a C-curve breaker, while still providing robust overcurrent protection.