WL Circuit Breakers - Siemens

Introduction and Overview
WL Circuit Breaker
This manual is aimed at those who
want to find out more about the
application benefits of communication-
capable circuit breakers in power
distribution systems. It also contains
a detailed guide to commissioning,
operating, diagnosing and maintaining
communications. WL Circuit Breakers.
WL PROFIBUS/MODBUS Communication and Electronic Accessories
Introduction and overview
Businesses are becoming increasingly more
intelligent about the way they consume
energy. Industrial and Commercial energy
consumers are continuously looking for
practical and efficient methods of
measuring their energy usage while
simultaneously that any possible
downtime is minimized. At Siemens we
understand those needs and we have
developed products and solutions to
help our customers exceed their goals.
The heart of our solutions begins with
our WL Circuit Breakers. The WL family
of breakers is a Siemens design that
combined decades of patented circuit
breaker protection experience with the
latest technology in circuit breaker
performance and communication.
A good example is our patented
technology: Dynamic Arc-Flash Sentry®
(DAS). DAS is an option that allows users
the ability to automatically lower the
down-stream available fault current
when personnel are nearby the electrical
equipment. Helping our customers provide
a safer work place environment is an
important part to our overall solutions.
Another important aspect that
complements our solutions is the WL
circuit breaker’s ability to gather power
and environmental data and send it to
central or remote monitoring devices or
systems. You’ll find these capabilities and
more when you take a closer look at our
lineup of Siemens WL circuit breakers.
SECTION 1
Practical solution
Power system protection is necessary
to treat common types of abnormal
occurrences, such as overloads or faults
that can lead to power system failure.
The methods for detecting and clearing
such abnormalities and restore to normal
operation is an engineered technique.
Adequate protection requires constant
measurements of certain system quantities,
such as voltages and currents, comparing
those system quantities, or some
combination of the quantities, to a
threshold setting computed by an engineer
and set into an electronic trip unit like
the ones available on the WL breakers.
It’s equally important for power system
protection to perform under normal
operating conditions. If the above
thresholds are set too low the power may
be interrupted unnecessarily causing loss
of productivity or safety provisions.
The WL circuit breaker offers a practical
means of setting power system protection
through vast selectivity available in its
Electronic Trip Unit (ETU). WL ETUs have
a wide range of protective settings for
engineering flexibility and reliable
system protection.
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