Description

SIEMENS ETU45B – SENTRON WL Electronic Overcurrent Trip Unit

Product Overview

ETU45B is an adjustable electronic trip unit for Siemens 3WL‑series air‑circuit breakers. It delivers configurable LSIN/LSIG multi‑level protection: long‑time overload, short‑time delay short‑circuit, instantaneous short‑circuit and optional neutral‑conductor or earth‑fault protection. Rotary switches allow fast on‑site parameter setup, while internal fault logging stores trip history for maintenance diagnostics. Optional CubicleBus and external COM modules support remote monitoring in industrial power distribution and SCADA systemsSiemens In….

Technical Specifications

• Brand: Siemens
• Model: ETU45B
• Warranty: One Year
• Condition: 100% New & Original
• Protection Functions: L‑overload, S‑short‑time delay, I‑instantaneous short‑circuit, N‑neutral protection, optional G‑earth‑fault
• Adjustment Mode: Front‑panel rotary coding switches
• Fault Memory: Trip‑cause storage for post‑fault analysis
• Communication: CubicleBus interface, expandable for PROFIBUS‑DP / Modbus
• Operating Temp: ‑20 °C ~ +70 °C
• Compatibility: SENTRON 3WL air circuit breaker platform
• Standard: IEC 60947‑2

Application Scenarios

• Industrial Main Switchgear: Main incoming and bus‑coupler breaker protection for factory power rooms
• Data‑Centre Power Distribution: Selective coordination for critical‑load low‑voltage systems
• Water‑Treatment Plant Substation: Motor‑centre and distribution‑panel overcurrent protection
• Commercial Building Power System: Reliable adjustable protection for large‑capacity air circuit breakers
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