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Siemens 5SY4204-8 Miniature Circuit Breaker — 2-Pole, D-Curve, 4A

Siemens 5SY4204-8 2-Pole Miniature Circuit Breaker, 4A, D-Curve.

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ManufacturerSiemens

Part number5SY4204-8

Part Number 5SY4204-8

Manufacturer Siemens

Type Miniature Circuit Breaker

Poles 2

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2-Pole Configuration 400V AC Rated 10kA Short-Circuit Rating D-Curve Tripping 4A Current Rating High Inrush Current Tolerance

Product description

The Siemens 5SY4204-8 is a two-pole miniature circuit breaker engineered for robust overcurrent protection. It is characterized by its D-curve tripping response, rated for 400V with a 10kA short-circuit breaking capacity. This breaker has a 4A current rating and a standard width of 70mm (D=70 mm), making it suitable for demanding applications.

This circuit breaker is ideal for protecting circuits with high inrush currents, such as those found in motor starting applications, transformers, and capacitor banks. Its D-curve ensures it won't trip unnecessarily during these brief, high-current events.

Stanlo Automation, a veteran-owned surplus distributor, provides access to essential industrial automation components like the Siemens 5SY4204-8. We are committed to supplying quality parts that meet stringent industrial needs, offering reliable solutions for your automation challenges.

Technical specifications

Part Number	5SY4204-8
Manufacturer	Siemens
Type	Miniature Circuit Breaker
Poles	2
Voltage	400V
Current Rating	4A
Tripping Curve	D
Breaking Capacity	10kA
Width	70mm

Common applications

Motor Protection

Transformer Circuits

Capacitor Banks

Industrial Machinery

Heavy Equipment

High Inrush Applications

Compatible systems

Siemens 5SY Series Accessories Standard DIN Rail Mounting Systems

Also known as

Siemens 5SY4204-8 MCB Siemens 2 pole D curve 4A breaker Siemens 400V 10kA breaker

Replaces / compatible with

This part belongs to the Siemens 5SY series and serves as a direct replacement for similarly specified 5SY4 breakers. Compatible with Siemens 5SY series accessories.

Technical note

Expert tip

The D-curve characteristic provides a time delay for high inrush currents, preventing nuisance tripping during motor startups or transformer energization.

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Frequently asked questions

When is the Siemens 5SY4204-8 miniature circuit breaker with a D-curve typically used?

The Siemens 5SY4204-8, with its D-curve, is best suited for circuits with high inrush currents. This includes applications like starting motors, protecting transformers, or managing capacitor banks where temporary current spikes are common.