08N6134

84-8511.5620

Manufacturer Part Number84-8511.5620
Description08N6134
ManufacturerEAO
84-8511.5620 datasheet
 

Specifications of 84-8511.5620

Contact ConfigurationSPST-NOContact Voltage Ac Nom42V
Contact Voltage Dc Nom42VContact Current Max20mA
Actuator StyleRoundSwitch TerminalsSolder Lug
Actuator / Cap ColorGreenRohs CompliantYes
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Application guidelines
Suppressor circuits
When switching inductive loads such as relays, DC motors, and DC solenoids, it is always important
to absorb surges (e.g. with a diode) to protect the contacts. When these inductive loads are switched
off, a counter emf can severely damage switch contacts and greatly shorten lifetime.
Fig. 1 shows an inductive load with a free-wheeling diode connected in parallel. This free-wheeling
diode provides a path for the inductor current to flow when the current is interrupted by the switch.
Without this free-wheeling diode, the voltage across the coil will be limited only by dielectric break-
down voltages of the circuit or parasitic elements of the coil. This voltage can be kilovolts in amplitude
even when nominal circuit voltages are low (e.g. 12 VDC) see Fig. 2.
The free-wheeling diode should be chosen so that the reverse breakdown voltage is greater than the
voltage driving the inductive load. The DC blocking voltage (VR) of the free-wheeling diode can be
found in the datasheet of a diode. The forward current should be equal or greater than the maximum
current flowing through the load.
To get an efficient protection, the free-wheeling diode must be connected as close as possible
to the inductive load!
0
Switching with inductive load
Fig. 1
Switch
+
Free-wheeling
Inductive
VDC
_
diode
load
30
05.2009
Counter emf
over load without free-wheeling diode
Fig. 2
ON
OFF
0
Sveral hundred
to several
di
__
e = L
thousend volts
dt
84