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Siemens 3RV2042-4FB10 S3 Motor Protection Circuit Breaker

Siemens 3RV2042-4FB10 Size S3 Motor Protection Circuit Breaker

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ManufacturerSiemens

Part number3RV2042-4FB10

Size S3

Motor Protection Yes

Class 20

A-release 28-40 A

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Veteran-owned

CAGE: 9NK75

Motor protection Class 20 rating Adjustable overload 100 kA breaking capacity Screw terminals Increased switching capacity

Product description

The Siemens 3RV2042-4FB10 is a Size S3 motor protection circuit breaker, featuring a Class 20 rating for slower tripping under sustained overloads. It includes an adjustable overload range (A-release) of 28 to 40 Amps and a short-circuit release (N-release) of 520 Amps. This breaker uses screw terminals, offers increased switching capacity, and a high breaking capacity of 100 kA.

This circuit breaker is ideal for motors that may experience longer start-up times or operate under sustained moderate overloads, providing protection without nuisance tripping. Applications include heavy machinery, industrial fans, and pumps in sectors like manufacturing and water treatment.

Stanlo Automation, a veteran-owned business, is your reliable source for the Siemens 3RV2042-4FB10. We offer quality surplus parts and dedicated customer support.

Technical specifications

Size	S3
Motor Protection	Yes
Class	20
A-release	28-40 A
N-release	520 A
Terminals	Screw
Switching Capacity	Increased
Breaking Capacity	100 kA

Common applications

Motor control

Industrial machinery

Manufacturing

Water treatment

HVAC systems

Heavy duty applications

Compatible systems

Siemens 3RV2 Series

Also known as

Siemens 3RV20424FB10 3RV2 S3 Class 20 breaker Siemens motor starter protector 28-40A

Replaces / compatible with

This Siemens 3RV2042-4FB10 is a Class 20 motor protection circuit breaker. It's suitable for applications requiring a slower response to overload conditions compared to Class 10 devices.

Technical note

Expert tip

The Class 20 rating of the Siemens 3RV2042-4FB10 is advantageous for applications with high inrush currents during motor startup, preventing premature tripping.

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Frequently asked questions

What is the difference between Class 10 and Class 20 for Siemens motor protection circuit breakers?

Class 10 breakers trip within 10 seconds at 6 times the rated current, while Class 20 breakers trip within 20 seconds at 6 times the rated current. Class 20 is suitable for motors with longer start-up times.