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Siemens 3RV2042-4JB10 S3 Motor Protection Circuit Breaker

Siemens 3RV2042-4JB10 Size S3 Motor Protection Circuit Breaker

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ManufacturerSiemens

Part number3RV2042-4JB10

Size S3

Motor Protection Yes

Class 20

A-release 45-63 A

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

Product description

The Siemens 3RV2042-4JB10 is a Size S3 motor protection circuit breaker with a Class 20 rating, suitable for motors with longer acceleration times. It features an adjustable overload setting (A-release) from 45 to 63 Amps and a short-circuit release (N-release) of 819 Amps. This model includes screw terminals, increased switching capacity, and a high breaking capacity of 100 kA.

This circuit breaker is designed for applications where motors experience extended startup periods or sustained overloads without immediate tripping. Common uses are in heavy industrial machinery, large fans, and pumping systems found in manufacturing and infrastructure projects.

Stanlo Automation, a veteran-owned company, offers the Siemens 3RV2042-4JB10. We are your reliable partner for surplus industrial automation parts, providing quality products and excellent service.

Technical specifications

Size	S3
Motor Protection	Yes
Class	20
A-release	45-63 A
N-release	819 A
Terminals	Screw
Switching Capacity	Increased
Breaking Capacity	100 kA

Common applications

Motor control

Heavy industrial machinery

Manufacturing

Infrastructure

Pump systems

Fan applications

Compatible systems

Siemens 3RV2 Series

Also known as

Siemens 3RV20424JB10 3RV2 S3 Class 20 breaker Siemens motor starter protector 45-63A

Replaces / compatible with

The Siemens 3RV2042-4JB10 is a Class 20 motor protection circuit breaker, suitable for motors that require a slower tripping characteristic during startup or overload conditions.

Technical note

Expert tip

The increased switching capacity and 100kA breaking rating of the Siemens 3RV2042-4JB10 make it a robust choice for high-fault current applications in industrial environments.

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Frequently asked questions

When should I use a Class 20 breaker like the Siemens 3RV2042-4JB10 instead of a Class 10?

A Class 20 breaker is recommended for motors with longer startup times or when operating conditions may involve sustained moderate overloads. It provides protection without nuisance tripping during these events.