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Siemens 5SY7425-8 Miniature Circuit Breaker: 4-Pole, 25A, D-Curve

Siemens 5SY7425-8 4-Pole Miniature Circuit Breaker, 25A

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ManufacturerSiemens

Part number5SY7425-8

Voltage 400V

Breaking Capacity 15kA

Poles 4

Curve Type D

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4-pole protection 15kA interrupting capacity Type D tripping characteristic 400V operational voltage 25A current handling

Product description

The Siemens 5SY7425-8 is a robust 4-pole miniature circuit breaker designed for the protection of four-conductor circuits in demanding environments. It offers a 400V operational voltage and a substantial 15kA breaking capacity. This breaker features a Type D tripping characteristic, making it ideal for applications with high inrush currents, and is rated for 25A.

This 4-pole breaker is commonly applied in industrial settings to protect three-phase circuits with a neutral conductor, especially those powering significant machinery like motors or transformers. Its Type D curve ensures reliable operation during startup while providing essential fault protection.

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Technical specifications

Voltage	400V
Breaking Capacity	15kA
Poles	4
Curve Type	D
Current Rating	25A
Width	70mm

Common applications

Three-phase motor circuits with neutral

Industrial machinery

Power distribution systems

High inrush current loads

Manufacturing plants

Compatible systems

Standard DIN rail mounting systems

Also known as

Siemens 5SY7425-8 MCB Siemens 25A 4-pole breaker 5SY7 series breaker

Replaces / compatible with

This 4-pole Type D circuit breaker serves as a direct replacement for other Siemens 4-pole miniature circuit breakers with similar electrical ratings. Always confirm compatibility before installation.

Technical note

Expert tip

The Type D curve is suitable for motor loads, but ensure it is correctly sized to prevent nuisance tripping during normal motor start-up sequences.

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Frequently asked questions

What safety considerations are important when installing a 4-pole Type D breaker like the Siemens 5SY7425-8?

When installing a Siemens 5SY7425-8, ensure all four poles are correctly wired to the three phases and the neutral conductor. For Type D breakers, verify that the load's inrush current characteristics are within the breaker's specified tripping range to prevent nuisance tripping or inadequate protection. Proper termination and grounding are also critical for safety.