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Siemens 7UT5121-4CB01-0CA0 Numerical Differential Protection Relay

Siemens numerical differential protection relay for transformers and generators.

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ManufacturerSiemens

Part number7UT5121-4CB01-0CA0

Type Numerical Differential Protection Relay

Application Transformers, Generators, Motors, Short Wires

Rated Current 1A

Aux Voltage 60V DC, 110V, 125V DC

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Numerical Differential Protection Overload Protection DMT/IDMT Functions Optical Fiber Interface Panel/Cubicle Mounting VDEW Addition

Product description

The Siemens 7UT5121-4CB01-0CA0 is a numerical differential protection relay designed for transformers, generators, motors, and short wires, featuring overload protection. It supports DMT/IDMT functions for one winding and two windings with two ends. The SW-Version is V3 with VDEW-addition, available in German/English languages, and operates at 50Hz.

This relay is pre-calibrated for a rated current of 1A and a frequency of 50/60 Hz, with special 16.7 Hz capability. The rated auxiliary voltage for the converter is 60V DC, 110V, or 125V. It is housed in a 7XP2030-2 case suitable for panel flush mounting or cubicle mounting, utilizing Weidmüller terminals and a serial 820NM optical fiber interface (FSMA-plug).

Stanlo Automation offers a wide range of surplus industrial automation parts. As a veteran-owned distributor, we are committed to providing reliable components like the Siemens 7UT5121-4CB01-0CA0 to keep your operations running smoothly.

Technical specifications

Type	Numerical Differential Protection Relay
Application	Transformers, Generators, Motors, Short Wires
Rated Current	1A
Aux Voltage	60V DC, 110V, 125V DC
Interface	820NM Optical Fiber (FSMA)
Case	7XP2030-2
Frequency	50/60 Hz, 16.7 Hz

Common applications

Power Transformers

Generators

Electric Motors

High-Voltage Lines

Substations

Industrial Power Systems

Compatible systems

Compatible with SCADA systems via optical fiber interface and standard industrial control systems.

Also known as

Siemens Protection Relay 7UT5 SIPROTEC 7UT5121 Numerical Differential Relay

Replaces / compatible with

This relay is designed for advanced protection schemes and may replace older electro-mechanical or less sophisticated numerical relays.

Technical note

Expert tip

The optical fiber interface (FSMA-plug) ensures robust communication, particularly in electrically noisy environments common in power substations.

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Frequently asked questions

What is the rated auxiliary voltage for the Siemens 7UT5121-4CB01-0CA0 relay?

The rated auxiliary voltage for the converter in the Siemens 7UT5121-4CB01-0CA0 is 60V DC, 110V, or 125V DC. This provides flexibility for different power supply configurations in control panels.