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Siemens 3RB3133-4UB0 Electronic Overload Relay, 12.5-50A, Size S2

Siemens 3RB3133-4UB0 Electronic Overload Relay

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ManufacturerSiemens

Part number3RB3133-4UB0

Current Range 12.5-50 A

Size S2

Trip Class 5E-30E

Mounting Contactor Mounting

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Veteran-owned

CAGE: 9NK75

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

Product description

The Siemens 3RB3133-4UB0 is a robust electronic overload relay designed for comprehensive motor protection of larger motors in size S2 applications. It features an adjustable current range from 12.5 to 50 A and is intended for direct mounting onto compatible Siemens 3RT contactors. This relay provides critical protection against overloads, phase failures, and internal ground faults, with selectable trip classes (5E to 30E) for precise motor safeguarding.

This overload relay is essential for protecting medium to large industrial motors used in applications such as large pumps, compressors, crushers, and heavy machinery. Its advanced electronic design ensures reliable performance and accurate tripping, minimizing downtime and preventing costly motor damage in demanding environments.

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Technical specifications

Current Range	12.5-50 A
Size	S2
Trip Class	5E-30E
Mounting	Contactor Mounting
Reset	Manual-Automatic
Features	Phase-failure sensitivity, Internal ground fault detection

Common applications

Large Pumps

Compressors

Crushers

Heavy Machinery

Industrial Manufacturing

Material Processing

Compatible systems

Siemens 3RT contactors (Size S2) Industrial motor control systems

Also known as

Siemens 3RB3133-4UB0 overload relay Siemens 12.5-50A 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, providing an electronic upgrade for motor protection in this size category.

Technical note

Expert tip

When installing, ensure adequate clearance for heat dissipation, especially in enclosed control cabinets. The auxiliary contacts are crucial for integrating with control circuits for remote signaling and reset functions.

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Frequently asked questions

What is the maximum current rating for the Siemens 3RB3133-4UB0 overload relay?

The Siemens 3RB3133-4UB0 electronic overload relay has an adjustable current setting range of 12.5 to 50 Amperes. This allows it to effectively protect medium to large industrial motors within this current range.