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Siemens 7UT6135-5EB91-1BA0-L0B Digital Differential Protection Relay

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ManufacturerSiemens

Part number7UT6135-5EB91-1BA0-L0B

Case 1/2 x 19"

Binary Inputs 5

Binary Outputs 8

Watchdog Contact 1

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CAGE: 9NK75

Digital differential protection Advanced fault detection (87N, 46, 50BF) Profibus DP Slave (fiber optic) 5BI, 8BO, 11I Transformer, generator, motor, busbar protection Trip circuit supervision (74TC)

Product description

The Siemens 7UT6135-5EB91-1BA0-L0B is a sophisticated digital differential protection relay for transformers, generators, motors, and small busbars. This unit is housed in a 1/2 x 19" case and features 5 binary inputs (BI), 8 binary outputs (BO), and 1 watchdog contact. It offers 11 current inputs (I) with a 5A current transformer (CT) and operates on a supply voltage of 110-250V DC or 115-230V AC. Advanced functionalities include differential protection (87 T G M L), restricted earth fault protection (87N), sensitive overcurrent-time protection (64), negative sequence protection (46), and breaker failure protection (50BF).

This relay provides comprehensive protection, including specialized functions like restricted earth fault and negative sequence protection, making it suitable for complex power system configurations. Its Profibus DP slave communication via fiber optic double ring ensures reliable data transfer.

Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens 7UT6135-5EB91-1BA0-L0B. We are committed to providing high-quality surplus industrial automation components to keep your operations running smoothly.

Technical specifications

Case	1/2 x 19"
Binary Inputs	5
Binary Outputs	8
Watchdog Contact	1
Current Inputs	11
Current Transformer	5A
Supply Voltage	DC 110-250V, AC 115-230V
Trigger Level Binary Input	88V
System Port	Profibus DP Slave (Fiber Optic Double Ring, ST-Plug)
Functionality	Differential Protection (87 T G M L), Restricted Earth Fault (87N), Sensitive Overcurrent-Time (64), Negative Sequence (46), Breaker Failure (50BF)

Common applications

Transformer protection

Generator protection

Motor protection

Busbar protection

Restricted earth fault protection

Compatible systems

Profibus DP master systems

Also known as

Siemens 7UT6135 SIPROTEC 4 7UT613 Digital Differential Relay

Replaces / compatible with

This relay is part of the Siemens SIPROTEC 4 series. Consult Siemens documentation for specific replacement or upgrade paths.

Technical note

Expert tip

The fiber optic connection for Profibus DP ensures immunity to electromagnetic interference and allows for longer transmission distances.

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Frequently asked questions

What specialized fault detection features does the Siemens 7UT6135-5EB91-1BA0-L0B offer?

The Siemens 7UT6135-5EB91-1BA0-L0B offers restricted earth fault (87N) for both low and high impedance systems, negative sequence protection (46) for unbalanced conditions, and breaker failure protection (50BF) to ensure system integrity during fault events.