Siemens 3WL1108-3CB31-1AA4-Z SENTRON 3WL Air Circuit Breaker

Feature & Principle

It is Siemens SENTRON 3WL series withdrawable air circuit breaker. Equipped with ETU25 electronic trip unit, supports LSI multi-section protection, overload, short-circuit protection. Drawout drawer structure facilitates online maintenance and replacement. Optional motor charging mechanism, auxiliary contacts and communication modules for SCADA remote monitoring. This model is phase-out, successor series is 3WA.

Specifications

Model: 3WL1108-3CB31-1AA4-Z Brand: Siemens Series: SENTRON 3WL Rated current In: 800A Frame: Size I Pole: 3P Structure: Withdrawable type Trip unit: ETU25 LSI Rated voltage: up to 690V AC Application: Power plant, petrochemical, factory main incoming cabinet, bus coupler Certification: CE, IEC 60947-2

Components & Diagnostics

Main contact assembly, arc extinguishing chamber, ETU25 trip unit, stored energy operating mechanism, closing coil, auxiliary switch, current transformer. Common faults: contact ablation, energy storage stuck, trip unit misoperation, communication dropout, coil burnout.

Product Brief

3WL1108-3CB31-1AA4-Z air circuit breaker, Siemens SENTRON 3WL low voltage distribution spare widely used for industrial power cabinet overhaul and replacement.