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Siemens 5SJ4125-8HG40 Miniature Circuit Breaker - 1-Pole, D-Curve, 25A

Siemens 5SJ4125-8HG40 1-pole Miniature Circuit Breaker, 25A

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ManufacturerSiemens

Part number5SJ4125-8HG40

Poles 1

Current Rating 25A

Voltage Rating 240V

Breaking Capacity 10kA

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1-pole protection D-curve tripping 10kA breaking capacity UL 489 certified High inrush current handling Equal polarity

Product description

The Siemens 5SJ4125-8HG40 is a 1-pole miniature circuit breaker featuring a D-curve tripping characteristic, designed for circuits with high inrush currents from inductive loads. It operates at 240V with a breaking capacity of 10kA and is UL 489 certified. This breaker has a rated current of 25A and a width of 70 mm.

This circuit breaker is ideal for protecting equipment such as motors, transformers, and other high-inrush devices commonly found in industrial automation, motor control centers, and heavy machinery. The D-curve provides enhanced protection for these types of loads.

Stanlo Automation, a veteran-owned supplier of surplus industrial automation parts, offers the Siemens 5SJ4125-8HG40. We are dedicated to providing reliable and cost-effective solutions for your automation needs.

Technical specifications

Poles	1
Current Rating	25A
Voltage Rating	240V
Breaking Capacity	10kA
Curve Type	D
Standard	UL 489
Width	70 mm

Common applications

Motor protection

Industrial machinery

Control panels

Power distribution

Automation systems

Heavy equipment

Compatible systems

Compatible with Siemens 5SJ series accessories and standard DIN rail mounting systems.

Also known as

Siemens 5SJ4125-8HG40 Siemens D-curve breaker

Replaces / compatible with

Suitable replacement for Siemens miniature circuit breakers requiring a D-curve characteristic for high inrush applications and UL 489 compliance.

Technical note

Expert tip

The 70mm width dimension is important for panel space planning and compatibility with standard enclosures.

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Frequently asked questions

When is a D-curve circuit breaker like the 5SJ4125-8HG40 recommended?

A D-curve breaker, such as the Siemens 5SJ4125-8HG40, is recommended for circuits feeding equipment with very high temporary inrush currents, like large motors or transformers during startup. The D-curve trips between 10 to 20 times the rated current, preventing nuisance tripping while still protecting against heavy faults.