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Siemens 5SY4340-8 3-Pole Miniature Circuit Breaker - 40A

Siemens 5SY4340-8 3-pole Miniature Circuit Breaker, 40A.

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ManufacturerSiemens

Part number5SY4340-8

Voltage 400V AC

Current 40A

Poles 3

Breaking Capacity 10kA

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Veteran-owned

CAGE: 9NK75

3-pole protection D-curve tripping characteristic 10kA breaking capacity DIN rail mountable Overload and short-circuit protection

Product description

The Siemens 5SY4340-8 is a 3-pole miniature circuit breaker (MCB) designed for reliable short-circuit and overload protection. It operates at 400V with a 10kA breaking capacity and features a D-curve tripping characteristic for handling high inrush currents. This breaker is suitable for industrial applications and ensures safety through its robust construction and adherence to international standards.

This MCB is ideal for use in control circuits, power distribution panels, and various industrial automation systems. Its D-curve is specifically designed to handle applications with significant motor starting currents or transformer inrush, preventing nuisance tripping while still providing essential protection against faults. Industries such as manufacturing, processing, and building automation commonly utilize these devices.

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Technical specifications

Voltage	400V AC
Current	40A
Poles	3
Breaking Capacity	10kA
Tripping Characteristic	D
Mounting	DIN Rail
Protection Class	IP20

Common applications

Industrial Control Panels

Motor Control Circuits

Power Distribution

Automation Systems

Manufacturing Facilities

Compatible systems

Siemens SENTRON 5SY Series

Also known as

Siemens 5SY4 MCB 5SY4340-8 CB Siemens 40A Circuit Breaker

Replaces / compatible with

Compatible with Siemens 5SY4 series accessories and related components.

Technical note

Expert tip

The D-curve characteristic of the 5SY4340-8 is ideal for circuits with high inrush currents, such as those associated with motor loads.

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Frequently asked questions

What is the breaking capacity of the Siemens 5SY4340-8?

The Siemens 5SY4340-8 miniature circuit breaker has a breaking capacity of 10kA at 400V AC. This ensures it can safely interrupt fault currents to protect electrical systems.