Application Description
Used in automation systems, electromechanical relays guarantee a safe
connection between process I/O and electronic controls. The following functions
are covered by relay coupling elements:
• Electrical isolation between the
input and output circuits
• Independence of the type of
switching current (AC and DC)
• High short-term overload
resistance in the event of short
circuits or voltage peaks
• Low switching losses
• Ease of operation
Accessories Power Terminal Block
The XRAPLCESK power terminal block has
the same shape as the relay modules and is
used to feed in the bridging potentials. The
nominal current is 32 A. When the total
current is less than or equal to 6 A, supply
can take place directly at the connecting
terminal blocks of one of the connected
relays.
End Cover
The XRAATPBK end cover is required at the
start and stop of a relay strip. It can also be
used for visual separation of groups of
relays as well as separating relays with
voltages greater than 250V and separating
neighboring bridges with different potentials.
It is equipped with pre-scored break out
points at the bridging positions so that
individual bridges can be passed through as
needed. It may also be necessary to use the
end cover between adjacent relays when
three phases (L1, L2, L3) are used on the
contact side of the relay.
Bridges
The XRAFBST colored, insulated plugin
bridge system reduces wiring time by up to
70% compared to conventionally wired
relays. The XRAFBST2, 2-position bridges,
are suited for bridging a smaller number of
relays and total currents <6 A. When a circuit
is supplied from both sides, the circuit can
be opened at any point, allowing all other
modules to continue being supplied at the
same time. The XRAFBST500 allow up to
80 modules to be bridged at one time. If
bridges with different potentials meet in
neighboring modules, the end cover
XRAATPBK should be used. All bridges are
equipped with a groove for removal with a
standard screwdriver.
SPECIFICATIONS Input Voltage:
XRU1D24: 24 Vdc
XRU1D24U: 24 Vac/Vdc
XRU1D120U: 120 Vac/110 Vdc Typical Input Current:
XRU1D24: 9 mA
XRU1D24U: 11 mA (24 Vac), 8.5 mA (24 Vdc)
XRU1D120U: 3.5 mA (120 Vac), 3 mA (110 Vdc) Connection Type: Screw connection Rigid Solid AWG (mm2): 26 to 14 (0.14 to 2.5) Flexible Stranded AWG (mm2): 26 to 14 (0.14 to 2.5) Typical Response Time:
XRU1D24: 5 mS
XRU1D24U and XRU1D120U: 6 mS Typical Release Time:
XRU1D24: 8 mS
XRU1D24U and XRU1D120U: 15 mS Input Protection:
XRU1D24: Polarity protection diode, free-wheeling diode
XRU1D24U and XRU1D120U: Bridge rectifier Contact Type: SPDT Contact Material: AgSnO Max Switching Voltage: 250 Vac/Vdc1 Min Switching Voltage: 12 Vac/Vdc Limiting Continuous Current: 6 A Min Switching Current: 10 mA Min Switching Power: 120 mW Ambient Temp Range: -20 to 60°C (-4 to 140°F) Rated Operating Mode: 100% operating factor Inflammability Class: V0, in accordance with UL 94 Mechanical Service Life: 2 x 107 cycles *The separating plate, XRAPLCESK, should
be installed for voltages greater than 250V
(L1, L2, L3) between identical terminal points
of adjacent modules. Potential bridging is
then possible with the XRAFBST bridge
system.
