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Siemens 5SY4105-8 1-Pole Miniature Circuit Breaker — 0.5A

Siemens 1-pole Miniature Circuit Breaker, 0.5A, D-curve.

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ManufacturerSiemens

Part number5SY4105-8

Voltage 230/400 V

Breaking Capacity 10 kA

Poles 1

Curve Type D

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1-pole protection 10kA breaking capacity D-curve characteristic Handles high inrush at low current Compact 70mm depth Siemens quality

Product description

The Siemens 5SY4105-8 is a specialized 1-pole miniature circuit breaker designed for applications requiring high inrush current tolerance at a low amperage. It boasts a 10kA breaking capacity at 230/400V and features a D-curve characteristic. This unit is rated for 0.5A and has a standard 70mm installation depth.

The D-curve in conjunction with a low 0.5A rating makes this breaker suitable for protecting circuits that experience very high, short-duration inrush currents, such as those associated with specific types of transformers or highly inductive loads, even at low power levels. It ensures operational reliability in niche industrial settings.

Stanlo Automation, a veteran-owned distributor of surplus industrial parts, proudly offers the Siemens 5SY4105-8. We are committed to delivering quality, dependable components to support your critical automation needs and maintain operational uptime.

Technical specifications

Voltage	230/400 V
Breaking Capacity	10 kA
Poles	1
Curve Type	D
Current Rating	0.5 A
Depth	70 mm
Manufacturer	Siemens

Common applications

Specialized transformers

Inductive loads

Low power high inrush circuits

Control circuits

Industrial automation

Niche applications

Compatible systems

Specialized industrial controls Small inductive power supplies Test equipment power inputs

Also known as

Siemens 5SY41058 Siemens 0.5A D-curve MCB Siemens high inrush breaker

Replaces / compatible with

Can replace older Siemens MCBs or comparable breakers requiring 1-pole, 0.5A D-curve protection for circuits with significant starting currents.

Technical note

Expert tip

The combination of a D-curve with a low 0.5A rating on the 5SY4105-8 is uncommon and specifically designed for applications where the transient inrush current can be many times the nominal operating current, yet the steady-state current is very low.

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Frequently asked questions

What specific type of load benefits from a Siemens 5SY4105-8 with a D-curve and low 0.5A rating?

A Siemens 5SY4105-8 with a D-curve and 0.5A rating is ideal for protecting circuits with specific loads that generate a very high, short-duration inrush current despite their low operating amperage. Examples include small transformers with high magnetizing inrush or certain types of specialized inductive equipment where a standard C-curve might trip prematurely.