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Siemens 3RB3133-4WB0 Electronic Overload Relay, 20-80A, Size S2

Siemens 3RB3133-4WB0 Electronic Overload Relay

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ManufacturerSiemens

Part number3RB3133-4WB0

Current Range 20-80 A

Size S2

Trip Class 5E-30E

Mounting Contactor Mounting

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Electronic Overload Protection Adjustable Current Setting Contactor Mountable Manual/Automatic Reset Phase-Failure Sensitivity Internal Ground Fault Detection

Product description

The Siemens 3RB3133-4WB0 is a high-capacity electronic overload relay designed for robust motor protection in size S2 applications. It features a wide adjustable current range from 20 to 80 A, suitable for larger industrial motors, and mounts directly onto compatible Siemens 3RT contactors. This relay provides essential protection against overloads, phase unbalance, and internal ground faults, with selectable trip classes (5E to 30E) for optimal motor safeguarding.

This overload relay is utilized in demanding industrial environments to protect large motors powering equipment such as heavy-duty conveyors, large pumps, industrial fans, and material processing machinery. Its electronic design ensures high accuracy and reliability, critical for preventing costly downtime and equipment damage.

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Technical specifications

Current Range	20-80 A
Size	S2
Trip Class	5E-30E
Mounting	Contactor Mounting
Reset	Manual-Automatic
Features	Phase-failure sensitivity, Internal ground fault detection

Common applications

Large Industrial Motors

Heavy Conveyors

Industrial Fans

Material Processing

Mining Equipment

Power Generation

Compatible systems

Siemens 3RT contactors (Size S2) High-power motor control circuits

Also known as

Siemens 3RB3133-4WB0 overload relay Siemens 20-80A Size S2 overload relay SIRIUS 3RB3133 electronic relay

Replaces / compatible with

This overload relay is designed for direct mounting onto Siemens 3RT contactors of Size S2, offering robust electronic protection for high-amperage motor applications.

Technical note

Expert tip

For optimal performance and safety, ensure that the selected trip class and current setting are correctly configured according to the motor's nameplate data and the applicable industry standards. This relay is designed for direct mounting onto Siemens 3RT contactors of Size S2.

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Frequently asked questions

What trip class options are available for the Siemens 3RB3133-4WB0 overload relay?

The Siemens 3RB3133-4WB0 overload relay features adjustable trip classes from 5E to 30E. This allows users to tailor the relay's response to the specific starting current and load characteristics of the motor, ensuring optimal protection.