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Siemens 3RV1042-4JB10 S3 Motor Protection Circuit Breaker

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ManufacturerSiemens

Part number3RV1042-4JB10

Size S3

A-release 45-63 A

Short-circuit release 819 A

Breaking capacity 100 kA

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Motor protection Adjustable A-release Increased switching capacity Screw terminals Class 20 protection High breaking capacity (100 kA) Size S3

Product description

The Siemens 3RV1042-4JB10 is a Size S3 circuit breaker for motor protection up to 100 kA. It features an adjustable A-release of 45-63 A and a short-circuit release of 819 A. This model is designed with screw terminals, increased switching capacity, and operates with Class 20 protection, offering a slightly longer time delay for starting currents compared to Class 10.

This circuit breaker is suitable for applications where motors have higher starting inrush currents or longer acceleration times. Industries such as manufacturing, material handling, and automation rely on its robust protection capabilities for various motor-driven equipment.

Stanlo Automation, a veteran-owned distributor of surplus industrial automation parts, offers the Siemens 3RV1042-4JB10. We provide a reliable and cost-effective solution for sourcing these critical components, ensuring your machinery remains operational and protected.

Technical specifications

Size	S3
A-release	45-63 A
Short-circuit release	819 A
Breaking capacity	100 kA
Terminal type	Screw terminal
Protection class	Class 20
Function	Motor protection

Common applications

Motor protection

Industrial machinery

Manufacturing automation

Material handling

Pump systems

Conveyor belts

Compatible systems

Siemens SIRIUS 3RV2 series accessories

Also known as

Siemens S3 breaker 3RV1042-4JB10 motor protection SIRIUS 3RV1042

Replaces / compatible with

This part is a phased-out product. The preferred successor is the Siemens SIRIUS 3RV2042-4JB10.

Technical note

Expert tip

The Class 20 rating of the 3RV1042-4JB10 is beneficial for applications with frequent or prolonged motor start-up sequences, preventing nuisance tripping.

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Frequently asked questions

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

Class 10 protection trips within 10 seconds at 6 times the set current, suitable for normal motor starts. Class 20 protection provides a longer trip time, suitable for motors with higher starting inrush or longer acceleration times, tripping within 20 seconds at 4.5 times the set current.