■ Fieldbus and connection technology independent
■ Protection class IP20
■ LEDs indicate status and diagnostic
■ Electronics galvanically separated from the
field level via optocouplers
■ 2 NC channels

Functional principle
BL20 electronic modules are plugged into the
purely passive base modules which are used
for connection of field devices. Maintenance is
significantly facilitated due to separation of the
connection level from the module electronics.
Furthermore flexibility is enhanced because
the base modules provide a choice of tension
spring or screw connection technology.
The electronic modules are completely independent of the type of higher level field bus
through the use of gateways.
Load limit curve
Definition: At 1000 switching cycles, a standing electric arc of > 10 ms may not occur.