Description

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Product Title

Siemens WLETU776 – WL Series Electronic Trip Unit

Product Overview

The Siemens WLETU776 is a solid‑state electronic trip unit designed for use with Siemens WL series low‑voltage power circuit breakers (WLS, WLH, WLL, WLC frames). As a key protective component, it continuously monitors electrical load conditions and responds when preset thresholds for current and fault types are exceeded, helping safeguard electrical systems against overloads, short circuits, and ground faults.

Built with Long‑Time, Short‑Time, Instantaneous, and optional Ground Fault (LSIG) protective functions, the Siemens WLETU776 integrates seamlessly with modern power distribution systems in industrial and commercial electrical installations. Its electronic design enables precise protection coordination, programmable trip settings, and compatibility with interchangeable rating plugs to suit varying load requirements.

Technical Specifications

Product Model: WLETU776

Brand: Siemens

Warranty: One Year

Input Voltage: Used with 600 V low‑voltage breakers

Operating Temperature: Typical ambient conditions for indoor switchgear

Storage Temperature: Standard industrial storage range

Response Time: Electronic trip response per protective settings

Protection Class: Solid‑state electronic trip unit

Accuracy Class: Industrial protective device grade

Output Frequency: N/A (protective function)

Rated Current Range: 200 A to 5000 A (depending on rating plug)

Communication Interface: Integrated breaker diagnostics (via CubicleBUS options)

Supported Protocols: Compatible with WL breaker backplane and communication modules

Overload Capacity: Coordinated with breaker frame ratings

Dimensions: Standard interchangeable trip unit form factor

 

Main Features and Benefits

Comprehensive Protective Functions:
Includes long‑time (overload), short‑time, instantaneous, and neutral or optional ground fault protection (when properly equipped), providing multi‑level circuit safeguarding.

Programmable Settings:
Adjustable overcurrent and trip parameters allow engineers to tailor protection coordination to system requirements and minimize nuisance trips.

Interchangeable and Upgradeable:
Designed to be installed or replaced without modifying the breaker frame; interchangeable rating plugs enable flexible current setting changes.

Electronic Reliability:
Solid‑state design enhances precision and reduces maintenance compared to traditional thermal or electromechanical trip mechanisms.

Application Scenarios

Industrial Power Distribution:
Used in plant electrical distribution boards and motor control centers to protect feeders and branch circuits from fault conditions.

Commercial Facility Switchgear:
Installed in large commercial electrical systems where accurate trip coordination is required for building services and critical loads.

Data Centers and Critical Infrastructure:
Provides reliable overcurrent protection in environments where uptime and coordinated protection schemes are essential.

Frequently Asked Questions (FAQ)

Q: What are the main functions of Siemens WLETU776?
A: The Siemens WLETU776 is an electronic trip unit that monitors current and executes circuit breaker trip logic—including long‑time, short‑time, instantaneous, and ground fault protection—based on configured settings.

Q: Is Siemens WLETU776 compatible with legacy systems?
A: The trip unit is designed for Siemens WL series low‑voltage breaker frames. Compatibility with legacy or third‑party breakers is limited; it typically requires a matching WL frame and appropriate rating plug configuration