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Siemens 5SX4120-7 Circuit Breaker — 20A 1-Pole C-Curve

Name: Siemens 5SX4 120-7
Brand: Siemens
SKU: 5SX4 120-7
Availability: InStock

Siemens 5SX4120-7 Miniature Circuit Breaker

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ManufacturerSiemens

Part number5SX4 120-7

Voltage 230/400V AC

Current 20A

Poles 1

Breaking Capacity 10kA

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Single-pole protection Type C tripping characteristic 10kA breaking capacity 230/400V AC rated Miniature circuit breaker Overload and short-circuit protection

Product description

The Siemens 5SX4120-7 is a single-pole miniature circuit breaker from the T55 series, offering reliable protection for individual circuits. It is rated for 230/400V AC and features a 10kA breaking capacity with a Type C tripping characteristic for its 20A current rating. This breaker is designed for precise overcurrent protection in various electrical installations.

This single-pole breaker is ideal for protecting lighting circuits, socket outlets, and smaller appliances in residential, commercial, and industrial applications. The Type C curve provides a balance between sensitivity to faults and tolerance for moderate inrush currents, making it a versatile choice for general-purpose protection.

Stanlo Automation, a veteran-owned distributor of surplus industrial automation parts, is your trusted source for the Siemens 5SX4120-7. We ensure that you receive quality components, delivered efficiently, to keep your systems running without interruption. Rely on Stanlo Automation for your critical component needs.

Technical specifications

Voltage	230/400V AC
Current	20A
Poles	1
Breaking Capacity	10kA
Tripping Characteristic	Type C
Series	T55

Common applications

Residential electrical panels

Commercial lighting circuits

Socket outlet protection

Single-phase appliance protection

Industrial control circuits

Compatible systems

Standard DIN rail mounting Single-phase electrical systems Residential and commercial panels Lighting and outlet circuits

Also known as

Siemens T55 1-pole breaker 5SX4120-7 MCB Siemens C20 breaker 20A single pole breaker

Replaces / compatible with

This breaker is designed to replace Siemens T55 series single-pole breakers with similar voltage, current, and tripping characteristics. Please consult the datasheet for exact compatibility.

Technical note

Expert tip

For single-phase circuits requiring neutral protection, use two single-pole breakers or a double-pole breaker if available and appropriate for the application.

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Frequently asked questions

What is the breaking capacity of the Siemens 5SX4120-7 circuit breaker?

The Siemens 5SX4120-7 circuit breaker has a breaking capacity of 10kA. This means it can safely interrupt fault currents up to 10,000 amperes without sustaining damage, providing robust protection against severe short circuits.