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Technical specifications for 7UT5121-4CB01-0AA0/LL
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Manufacturer:Siemens
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Product Category:General Automation
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Spare Part Number:7UT5121-4CB01-0AA0/LL
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Estimated shipping dimensions:14.9×23.4×26.7cm
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Weight:5.64 kg
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Tariff Code:8537101190
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Counliy of origin:Germany
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Product family:SIPROTEC 7UT512
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Protection duty:Transformer differential protection
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Catalog status:Earlier product family
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Catalog successor family:7UT612
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Order suffix:/LL
Information
Overview
Manuals
Common Applications
Product Precautions
Within a transformer protection panel, Siemens 7UT5121-4CB01-0AA0/LL is governed by the approved CT data, vector compensation, restraint settings and trip logic for that installation.
- 7UT512 transformer protection family
- Differential protection duty
- Protection-panel installation
- Exact /LL suffix retained
The controlled engineering path is Transformer CT circuits → Differential and restraint processing → Protection decision → Trip, alarm and event outputs; preserve the approved system record and verify the intended final response before release.
Important Notice: Confirm the complete /LL order suffix, transformer data and CT wiring before transferring protection settings.
Siemens 7UT5121-4CB01-0AA0/LL Manuals & Downloads
Siemens 7UT5121-4CB01-0AA0/LL Official Technical Reference Excerpt (PDF)Siemens 7UT5121-4CB01-0AA0/LL Installation & Commissioning Guide (PDF)
Important Notice: The official Siemens catalog identifies the applicable SIPROTEC 7UT512 transformer-differential family; the ApterPower guide provides a separate exact-model field sequence for preparation, connection checks, functional proving and acceptance.
Power-transformer protection
Differential protection in a documented transformer relay scheme.
Legacy relay replacement
Exact-order-code spare evaluation with CT and trip-circuit records.
Protection testing
Bias/restraint and trip-path verification against approved settings.
Outage maintenance
Controlled relay change with settings and event-record preservation.
Apply these exact-model controls to Siemens 7UT5121-4CB01-0AA0/LL before isolation, replacement, reconnection, energization and final release.
1
Short and safely isolate CT secondary circuits before disturbing relay wiring.
2
Retain the complete 7UT5121-4CB01-0AA0/LL identity in every record.
3
Verify CT ratio, polarity, phase sequence and grounding against drawings.
4
Back up approved differential and restraint settings before removal.
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Do not infer terminal equivalence from another 7UT512 order code.
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Confirm every blocking, interlock, alarm and lockout path before energization.
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Use controlled secondary injection to prove operating and restraint behavior.
8
Record as-left settings, test currents, trip times and restored indications.
Technical notes
Transformer-side CT ratios, vector-group compensation and differential trip logic must be reconciled with the approved protection study. Complete a controlled primary or secondary test before release.
FAQ View All FAQ
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Which transformer differential function is assigned to Siemens 7UT5121-4CB01-0AA0/LL?It is a 7UT512-family transformer differential protection relay.
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What engineering review is needed before applying a 7UT612 in place of Siemens 7UT5121-4CB01-0AA0/LL?Siemens identifies 7UT612 as a later product family, but conversion of wiring, settings and scheme logic must be engineered.
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Which CT ratio, polarity and vector-group checks are required for Siemens 7UT5121-4CB01-0AA0/LL?Confirm ratio, polarity, phase assignment, secondary grounding and the approved transformer vector compensation.
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How should the /LL suffix be preserved for Siemens 7UT5121-4CB01-0AA0/LL?Retain /LL exactly in identification, settings, spare selection and handover records; do not expand or remove the suffix.
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When may a setting file from another 7UT512 unit be applied to Siemens 7UT5121-4CB01-0AA0/LL?Only after the protection study, transformer data, CT data and hardware identity are proven to match.
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Which injection tests verify differential and restraint behavior on Siemens 7UT5121-4CB01-0AA0/LL?Use the approved secondary-injection plan to test operating and restraint regions without energizing primary equipment.
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What handover evidence closes work on Siemens 7UT5121-4CB01-0AA0/LL?Provide the exact nameplate, approved settings, injection results, trip-path proof and the as-left wiring record.
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