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Siemens 5SX2120-7 Miniature Circuit Breaker - 1-Pole, 20A

Siemens 5SX2120-7 Miniature circuit breaker, 1-pole, 20A, C-curve.

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ManufacturerSiemens

Part number5SX2120-7

Type Miniature Circuit Breaker (MCB)

Manufacturer Siemens

Series T55

Poles 1

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1-Pole Design 20A Current Rating C-Curve Characteristic 6kA Breaking Capacity Overload and Short Circuit Protection Siemens Quality

Product description

The Siemens 5SX2120-7 is a T55 miniature circuit breaker. It is a 1-pole (single-pole) device with a C-curve tripping characteristic, designed for overcurrent protection. This breaker has a rated current of 20A and can be used in circuits with a voltage of 230V AC for single-pole operation or 400V AC for two-pole operation. It offers a breaking capacity of 6kA, ensuring safety in fault conditions.

Miniature circuit breakers like the 5SX2120-7 are essential safety devices in electrical installations. They protect wiring and equipment from damage caused by overloads and short circuits, commonly used in residential, commercial, and industrial electrical distribution systems, control panels, and machinery.

Stanlo Automation, a veteran-owned supplier of surplus industrial automation parts, offers the Siemens 5SX2120-7 circuit breaker. We provide reliable and cost-effective solutions for your electrical protection needs, ensuring the safety and integrity of your systems with quality surplus components.

Technical specifications

Type	Miniature Circuit Breaker (MCB)
Manufacturer	Siemens
Series	T55
Poles	1
Rated Current	20A
Tripping Curve	C
Voltage	230/400V AC
Breaking Capacity	6kA

Common applications

Electrical Distribution Panels

Control Cabinets

Industrial Machinery

Residential Wiring

Commercial Installations

Safety Protection

Compatible systems

AC power circuits Electrical distribution systems Control panels Industrial machinery wiring

Also known as

Siemens T55 Circuit Breaker 5SX21207 Siemens 1-Pole MCB

Replaces / compatible with

This circuit breaker can replace other Siemens T55 series 1-pole, 20A, C-curve breakers or breakers with equivalent specifications from other manufacturers. Always verify voltage and breaking capacity requirements.

Technical note

Expert tip

The C-curve tripping characteristic of the 5SX2120-7 is suitable for circuits with moderate inductive loads, providing a balance between protection and nuisance tripping.

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Frequently asked questions

What is the breaking capacity of the Siemens 5SX2120-7 miniature circuit breaker?

The Siemens 5SX2120-7 miniature circuit breaker has a breaking capacity of 6kA (kiloamperes). This indicates its ability to safely interrupt fault currents up to this level, providing crucial protection against short circuits.