Siemens 6SL3955-0TX00-1AA0 Siemens 21F 8 kV thyristor gate unit

The captured listing identifies 6SL3955-0TX00-1AA0 as a 21F thyristor gate unit for 8 kV equipment. The listing describes electronic over-voltage protection for the 3.6 kV to 7 kV range.

System function and position

Rebuilt from individual evidence

The captured listing identifies 6SL3955-0TX00-1AA0 as a 21F thyristor gate unit for 8 kV equipment.

The listing describes electronic over-voltage protection for the 3.6 kV to 7 kV range.

Sits between the drive control electronics and the high-voltage thyristor power stage.

Unknown: installed topology, wiring, firmware, unit condition, and replacement compatibility for 6SL3955-0TX00-1AA0 require separate evidence.

Exact reference: 6SL3955-0TX00-1AA0
Category: Drives / VFD
Evidence checked: 2026-09-12

System role

This section explains what the product does and where it acts in the surrounding system.

Function: Controls thyristor gate triggering in the documented high-voltage power-conversion stage.
System position: Sits between the drive control electronics and the high-voltage thyristor power stage.
Upstream / inputs: Receives gate-control commands and high-voltage protection signals from the upstream drive control path.
Downstream / outputs: Sends controlled gate-drive signals to the downstream thyristor bridge.
Limitations: Unknown: installed topology, wiring, firmware, unit condition, and replacement compatibility for 6SL3955-0TX00-1AA0 require separate evidence.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

The captured listing identifies 6SL3955-0TX00-1AA0 as a 21F thyristor gate unit for 8 kV equipment.
Confidence: medium
- www.automation-berlin.com — retrieved 2026-09-12; medium confidence
The listing describes electronic over-voltage protection for the 3.6 kV to 7 kV range.
Confidence: medium
- www.automation-berlin.com — retrieved 2026-09-12; medium confidence

Inferences

Inferred system position: Sits between the drive control electronics and the high-voltage thyristor power stage.
Confidence: medium
Rationale: The exact product description and documented operating context establish this system placement.
- www.automation-berlin.com — retrieved 2026-09-12; medium confidence

Unknowns

Unknown: installed topology, wiring, firmware, unit condition, and replacement compatibility for 6SL3955-0TX00-1AA0 require separate evidence.
Confidence: low
Missing evidence: The individual lookup does not establish the installed topology, wiring, firmware, unit condition, or replacement fit.

System position diagram

A flow from the upstream system through 6SL3955-0TX00-1AA0 to the downstream drive system. — Sits between the drive control electronics and the high-voltage thyristor power stage.

View Mermaid source

flowchart LR
  upstream["Upstream system"] --> item["6SL3955-0TX00-1AA0"]
  item --> downstream["Downstream drive system"]

View diagram labels

Nodes: Upstream system; 6SL3955-0TX00-1AA0; Downstream drive system
Edges: Documented input path; Documented output path

Next action

The captured evidence supports the documented system role for 6SL3955-0TX00-1AA0.

Unknown: installed topology, wiring, firmware, unit condition, and replacement compatibility for 6SL3955-0TX00-1AA0 require separate evidence.

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