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Siemens 5SJ4125-8HG42 Circuit Breaker - 1-Pole, D-Curve, 25A, 277V

Siemens 5SJ4125-8HG42 1-pole Circuit Breaker, 25A, 277V

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ManufacturerSiemens

Part number5SJ4125-8HG42

Poles 1

Current Rating 25A

Voltage Rating 277V

Breaking Capacity 10kA

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1-pole protection D-curve tripping 10kA breaking capacity UL 489 certified for 277V Handles high inrush Industrial duty

Product description

The Siemens 5SJ4125-8HG42 is a 1-pole circuit breaker designed for high-inrush applications, featuring a D-curve tripping characteristic. It is rated for 277V with a breaking capacity of 10kA and complies with UL 489 standards for 277V systems. The nominal current is 25A.

This breaker is crucial for protecting circuits with significant inductive loads, such as motors and transformers, in industrial and commercial facilities operating at 277V. It ensures reliable circuit protection against overloads and short circuits during motor startup and normal operation.

Stanlo Automation, a veteran-owned provider of surplus industrial automation parts, offers the Siemens 5SJ4125-8HG42. We ensure that you receive dependable, quality components for your automation needs.

Technical specifications

Poles	1
Current Rating	25A
Voltage Rating	277V
Breaking Capacity	10kA
Curve Type	D
Standard	UL 489

Common applications

Motor protection

Industrial controls

277V electrical systems

Heavy machinery

Power distribution

Automation panels

Compatible systems

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

Also known as

Siemens 5SJ4125-8HG42 Siemens 277V D-curve breaker

Replaces / compatible with

This circuit breaker is suitable for replacing or is compatible with other Siemens 5SJ series breakers that meet the 277V, 10kA, D-curve UL 489 requirements.

Technical note

Expert tip

Ensure that the 277V system is properly grounded and protected by a main breaker with an adequate interrupting rating when using this device.

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Frequently asked questions

What makes the Siemens 5SJ4125-8HG42 suitable for motor circuits at 277V?

The Siemens 5SJ4125-8HG42 is suitable for 277V motor circuits due to its D-curve tripping characteristic, which can handle the high inrush currents typical during motor startup. Coupled with its 10kA breaking capacity and UL 489 certification for 277V, it provides safe and reliable protection.