8181980000 Weidmuller, 8181980000 Datasheet - Page 3

• Manufacturer Part Number: 8181980000
• Description: TERM DK45 TS35 24VDC SPDT
• Manufacturer: Weidmuller

Specifications of 8181980000

• Relay Type: General Purpose
• Contact Form: SPDT (1 Form C)
• Contact Rating (current): 5A
• Switching Voltage: 250VAC
• Coil Type: Standard
• Coil Current: 11.5mA
• Coil Voltage: 24VDC
• Mounting Type: DIN Rail
• Termination Style: Screw Terminal
• Circuit: SPDT (1 Form C)
• Contact Rating @ Voltage: 5A @ 250VAC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Control On Voltage (max): -
• Control Off Voltage (min): -
• Other names: DK45/35 24VDC SPDT

Protective circuits of the contacts
Switching sparks may occur when switch-
ing inductive or capacitive loads that affect
the operational life of the relay.
The following protective circuits offer the
possibility of reducing contact wear:
Diode:
Advantage:
Disadvantage: very long drop-out delay
Diode and Z-diode:
Advantage:
Disadvantage: not usable for high power ratings
RC combination:
Advantage:
Disadvantage: higher current loading on contacts at
Varistor:
Advantage:
Disadvantage: not for all operating voltages and
U
1
2
60
Relay Coupler
S
–
(~)
–
(~)
–
–
Load
Load
Load
Last
Load
+
(~)
Last
+
Voltage curve
Close
Open
(~)
Last
+
Last
+
can be used for all ratings, low
overvoltage, minimum space require-
ments, economic
low overvoltage (determined by Z-
diode), low drop-out delay
low overvoltage, low drop-out delay
switch-on, complex and expensive for
increased power rating
low drop-out delay, economic
power ratings
VDR
R
C
U
U
D
U
VDR
U
RC
ZD
U
U
U
U
S
S
S
S
1
1
1
1
2
2
2
2
t
t
t
t
Switching of small and large power
ratings
For automation technology, Weidmüller
offers the EGR EGR 7 relay coupler to
switch ratings up to 40 µW under resistive
loads. This allows signals to be reliably
relayed to control devices.
The switching of higher power ratings in
power supply technology is achieved by
the RS 31 relay coupler, which guarantees
switching capacity up to 3.5 kVA under
resistive loads.
Switching times of the relay modules
pick-up delay
drop-out delay
Switching behaviour/load limit curve
(dependimg on type)
Contact life
with resistive load
DC-limit
with resistive load
Reduction factor
with inductive load cos j < 1
Switching no. eff.
= switching no (at cos j = 1) x red. Factor F
Relay couplers with plugged relays
Relay couplers with plugged relays are
only conditionally suitable for use in appli-
cations subject to heavy vibrations. Relay
couplers with soldered relays are to be
preferred.
Single contact
Switching capacity (kVA)
typ. < 10 ms
typ. < 12 ms
Direct Voltage (V)
Power factor
Derating curves
The contact resistance is largely responsi-
ble for heat development within the relay.
This link is demonstrated by a derating
curve as a function of the permissible cur-
rent subject to the ambient temperature.
We determine the current (curve a) for the
following operating conditions:
- continuous operation
- rated input voltage + 10 %
- several relay modules operating under
A higher load is applicable when modules
are mounted with a gap of 20 mm as
shown in curve "b". In addition, the func-
tion of curve "b" shows the max. values
for a switching or short-time operation
when assembled horizontally on the
mounting rail.
Notes for usage
The characteristic data of the actuation
are to be meticulously observed when
using UC variants in DC circuitry. UC vari-
ants have a higher current input at the
moment of switching due to their series
circuitry. The internal current limiter of
commercially available initiators can result
in the operated relay coupler not being
switched through.
RC combination
Long supply cables are particularly open
to electrical and electro-mechanical influ-
ences. These can lead to disturbances of
the function or even failure of the relay
module. A remedy for this problem is an
RC combination in series that filters out
unwanted disturbances. RC combinations
are available for all customary relay cou-
plers: pluggable (PLUGSERIES) or as ter-
minal block (WDU 12C and DKU 12C).
load, mounted horizontally in a row
without spacing on mounting rail