SIEMENS
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Siemens IK PI · 2015
IO-Link
SIRIUS 3RB24 solid-state overload relays for IO-Link
3RB24 for IO-Link, up to 630 A for High-Feature applications
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Application
Industries
The 3RB24 solid-state overload relays are suitable for customers
from all industries who want to guarantee optimum inverse-time
delayed and temperature-dependent protection of their electri-
cal loads (e.g. motors) under normal and heavy starting condi-
tions (CLASS 5 to 30), minimize project completion times, inven-
tories and energy consumption, and optimize plant availability
and maintenance management.
Application area
The 3RB24 solid-state overload relays have been designed for
the protection of three-phase asynchronous and single-phase
AC motors.
In addition to protection function, these devices can be used
together with contactors as direct or reversing starters (star-
delta (wye-delta) start also possible), which are controlled via
IO-Link. This makes it possible to directly control drives via
IO-Link from a higher-level controller or on site via the optional
hand-held device lamps and also, for example, to return current
values directly via IO-Link.
If single-phase AC motors are to be protected by the 3RB24
solid-state overload relays, the main current paths of the current
measuring modules must be series-connected ("Circuit Dia-
grams" see Manual "SIRIUS 3RB24 Solid-State Overload Relay
for IO-Link",
).
Ambient conditions
The devices are insensitive to external influences such as
shocks, corrosive ambient conditions, ageing and temperature
fluctuations.
For the temperature range from –25 C to +60 °C, the 3RB24
solid-state overload relays compensate the temperature in ac-
cordance with IEC 60947-4-1.
Configuration notes for use of the devices below –25 °C or
above +60 °C on request.
© Siemens AG 2014