Siemens WLETU748 ETU748 electronic trip unit

Siemens documentation and the exact product listing identify WLETU748 as an ETU748 electronic trip unit for WL circuit breakers. The exact listing records LSG trip functions, three poles, and a 600 V rating for WLETU748.

Documented system function and position

Rebuilt from individual evidence

Siemens documentation and the exact product listing identify WLETU748 as an ETU748 electronic trip unit for WL circuit breakers.

The exact listing records LSG trip functions, three poles, and a 600 V rating for WLETU748.

Sits within the WL circuit breaker between current sensing and the breaker trip mechanism.

Unknown: installed wiring, firmware, condition, and installation-specific compatibility are not established by the captured sources.

Exact reference: WLETU748
Category: PLC / CPU
Evidence checked: 2026-09-12

System role

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

Function: Protects a WL circuit breaker by monitoring current and initiating configured trip action.
System position: Sits within the WL circuit breaker between current sensing and the breaker trip mechanism.
Upstream / inputs: Receives sensed current and configured protection settings from the WL breaker system.
Downstream / outputs: Initiates the downstream breaker trip action when a configured protection condition is met.
Limitations: Unknown: installed wiring, firmware, condition, and installation-specific compatibility are not established by the captured sources.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

Siemens documentation and the exact product listing identify WLETU748 as an ETU748 electronic trip unit for WL circuit breakers.
Confidence: high
- support.industry.siemens.com — retrieved 2026-09-12; high confidence
The exact listing records LSG trip functions, three poles, and a 600 V rating for WLETU748.
Confidence: high
- support.industry.siemens.com — retrieved 2026-09-12; high confidence
- www.qualityswitchgear.com — retrieved 2026-09-12; medium confidence
Protects a WL circuit breaker by monitoring current and initiating configured trip action.
Confidence: high
- support.industry.siemens.com — retrieved 2026-09-12; high confidence

Inferences

Inferred system position: Sits within the WL circuit breaker between current sensing and the breaker trip mechanism.
Confidence: medium
Rationale: The exact-reference identity and documented product function establish the adjacent system stages.
- support.industry.siemens.com — retrieved 2026-09-12; high confidence

Unknowns

Unknown: installed wiring, firmware, condition, and installation-specific compatibility are not established by the captured sources.
Confidence: low
Missing evidence: The captured sources do not establish installed wiring, firmware, condition, or installation-specific compatibility.

System position diagram

A flow from Receives sensed current and configured protection settings from the WL breaker system. through WLETU748 to Initiates the downstream breaker trip action when a configured protection condition is met.. — System placement inferred from the cited evidence: Sits within the WL circuit breaker between current sensing and the breaker trip mechanism.

View Mermaid source

flowchart LR
  upstream["Receives sensed current and configured protection settings from the WL breaker system."] -->|documented path| item["WLETU748"]
  item -->|documented path| downstream["Initiates the downstream breaker trip action when a configured protection condition is met."]

View diagram labels

Nodes: Receives sensed current and configured protection settings from the WL breaker system.; Siemens WLETU748 ETU748 electronic trip unit; Initiates the downstream breaker trip action when a configured protection condition is met.
Edges: Documented upstream path; Documented downstream path

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