61-1110.0 EAO, 61-1110.0 Datasheet - Page 51

• Manufacturer Part Number: 61-1110.0
• Description: Switch Actuator
• Manufacturer: EAO

Specifications of 61-1110.0

• Mounting Hole Dia: 16mm
• Collar Shape: Round
• Switch Operation: (ON)
• Actuator Style: Round
• For Use With: 61 Series Illuminated Pushbutton Switches
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Application guidelines
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
breakdown 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
VDC
Suppressor circuits
+
_
Switching with inductive load
Free-wheeling
Fig. 1
Switch
diode
Inductive
load
over load without free-wheeling diode
Sveral hundred
thousend volts
to several
Counter emf
0
Fig. 2
ON
OFF
e = L
__
dt
di
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