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Siemens 3RV1042-4MB10 S3 Motor Protection Circuit Breaker

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ManufacturerSiemens

Part number3RV1042-4MB10

Size S3

A-release 80-100 A

Short-circuit release 1235 A

Breaking capacity 100 kA

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CAGE: 9NK75

Motor protection High current A-release (80-100 A) Increased switching capacity Screw terminals Class 20 protection High breaking capacity (100 kA) Size S3

Product description

The Siemens 3RV1042-4MB10 is a high-performance Size S3 circuit breaker designed for robust motor protection up to 100 kA. It offers an adjustable A-release range of 80-100 A and a short-circuit release of 1235 A. This breaker utilizes screw terminals, features increased switching capacity, and operates with Class 20 protection, making it suitable for motors with higher starting inrush currents or longer acceleration periods.

This circuit breaker is ideal for safeguarding large industrial motors and complex machinery in demanding applications within manufacturing, material handling, and process automation. Its Class 20 rating ensures reliable operation during motor startups while providing essential protection against overloads and short circuits.

Stanlo Automation, a veteran-owned distributor of surplus industrial automation parts, offers the Siemens 3RV1042-4MB10. We are committed to providing quality, cost-effective surplus components to keep your critical automation systems running efficiently and without interruption.

Technical specifications

Size	S3
A-release	80-100 A
Short-circuit release	1235 A
Breaking capacity	100 kA
Terminal type	Screw terminal
Protection class	Class 20
Function	Motor protection

Common applications

Large industrial motors

Heavy machinery

Manufacturing

Material handling

Process automation

Automation lines

Compatible systems

Siemens SIRIUS 3RV2 series accessories

Also known as

Siemens S3 breaker 3RV1042-4MB10 motor protection SIRIUS 3RV1042

Replaces / compatible with

This part is a phased-out product. The preferred successor is the Siemens SIRIUS 3RV2042-4MB10.

Technical note

Expert tip

The 80-100A adjustment range of the 3RV1042-4MB10 makes it suitable for very large motors where precise overload settings are critical for preventing damage and ensuring operational continuity.

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Frequently asked questions

When should I choose a Class 20 rated breaker like the 3RV1042-4MB10 over a Class 10?

A Class 20 rated breaker like the Siemens 3RV1042-4MB10 is recommended for motors that experience high starting current or require longer acceleration times. It allows for a longer trip delay during startup, preventing nuisance tripping while still providing effective overload protection.