704.603.4 EAO, 704.603.4 Datasheet - Page 108

• Manufacturer Part Number: 704.603.4
• Description: LENS, ROUND, YELLOW
• Manufacturer: EAO

Specifications of 704.603.4

• Lens Color: Yellow
• Lens Diameter: 29mm
• Leaded Process Compatible: Yes
• Lens Shape: Round
• For Use With: Series 14 Illuminated Pushbuttons
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Glossary
Lamp transformer
Voltage reduction of a control voltage to a lower voltage for the supply of an
Illuminant (i.e: 230 VAC to 24 VAC )
Leakage path
IEC 947-1 para. 2.5.51, DIN EN 61058 T. 1 (VDE 0630 T. 1 ) para. 3. 1 .8 => Shortest
distance (mm) along the surface of the insulation material between conducting
parts or between an electrically conducting part and metal foil on the
touchable surface made of insulating material
Lens
Operation part for the activation of the electrical Contact of a pushbutton
Locking pushbutton actuator
Pushbutton actuator (without contact), which is locked into a position by an
additional pushing (i.e: maintained action)
Low Level Switching element
4-fold contact (slow-make element) for the switching of low currents and
voltages with very high certainty of switching
Maintained Action
The circuit stays open or closed after switch actuation until the next time the
switch is actuated
Make-Before-Break
When moving contacts complete one circuit before interrupting another. Also
called shorting
Mechanical service life
Wear-resistant property of a switch without electrical load, expressed in number
of actuations
Membrane switching
Switching system with one or more Contacts under a common foil (also
designated as membrane keyboard)
Momentary Action
The circuit is opened or closed only as long as the switch is actuated (pulse)
Mounting tool
For simple mounting of a Switchgear or Indicator
Mushroom-head cap
Mushroom-shaped Operation part for the activation of an electrical contact
NC - Normally Closed
Contact, which is closed in the non-activated position, opens a circuit upon
activation
NO - Normally Open
Contact, which is open in the non-activated position, closes a circuit upon
activation
Oil & Watertight Switches
Switches with mechanisms that are sealed to withstand exposure to liquids.
Usually are rated to indicate degree of sealing, i.e: NEMA or IP classifications
Opaque
Light-impervious, i.e: black or grey lens
Open circuit
Open circuit is contact lift-off or a result of low contact pressure
Operating Position
Position of the actuator at which the contact operates
Operating temperature
Permissible temperature range for the operation of a device
Operating part
DIN EN 61058 T. 1 (VDE 0630 T. 1 ) para. 3.4.3 => The part (lens, knob, etc.) of a
hand-activated switchgear which is used for effecting the contact
Overtravel
Distance from operating position (actuation point) to the end of the actuator’s travel
Overvoltage category
IEC 947-1 para. 2.5. 1 9 => Reference number for overvoltages, i.e: by lightning
effects or switching processes which can occur at the installation site. There is
a classification into 4 grades
www.eaoswitch.com
108
EAO Switch Condensed Catalog 100
Plug-in connection
Connection of the electrical circuit by means of a plugging-in device (connector)
Poles
The number of separate circuits that can be active through a switch at any one time
Pretravel
Distance from free position to operating position
Protection classes
Measure for the protection of the electrical operating material against the
penetration of solid bodies and of water, is expressed in IP and figures (DIN
VDE 0470 T. 1 / EN 60529). The 1st figure defines the solid-body protection, the
2nd figure the water protection
Pushbutton
Switchgear, that is generally activated by the finger and which initiates a
switching
Pushbutton actuator
Front part of a Pushbutton without Switching element
Pushbutton maintained action
Switch with maintained action and spring resetting on renewed activation as
well as a lens, which is generally activated with the finger
Pushbutton momentary action
Switch with spring resetting and a lens, which is generally activated with the
finger
Push-Pull illuminated button
Switch with an Operation part, which is activated by pressing and returns to its
initial position by pulling, or vice-versa
Quick Make/Break contacts
Used with D.C. circuits to suppress arcing
Rated constant current
IEC 947-1 para. 4.3.2.4 => Current (A) which a device can conduct in continuous
operation (weeks, months, years)
Rated higher current
IEC 947-1 para. 4.3.2.3 => The current (A) which a switchgear can conduct,
taking into consideration Rated higher voltage, operating period, service
category and Ambient temperature
Rated higher voltage
IEC 947-1 para. 4.3. 1 . 1 => Voltage (V) to which the characteristic value of a
switchgear is associated. The highest rated higher voltage may not be higher
than the Rated insulation voltage
Rated insulation voltage
IEC 947-1 para. 4.3. 1 .2 => The voltage, (V , kV), to which insulation tests and
Leakage paths are related. The highest Rated higher voltage may not be
greater than the rated insulation voltage
Rated surge voltage resistance
IEC 947-1 para. 4.3. 1 .3 => Measurement for the strength in the interior of
switchgear with regard to rated surge voltage resistance (kV)
Rebound time
The rebound time for a Contact, which closes/opens its circuit, is the time
interval between the first closing/opening and the final closing/opening
Release Position
Position of momentary actuator at which contact resumes normal position
Resistance element
Ohmic resistor in an element block
Resistance to vibration
Property of a Switchgear to withstand undulating movements without a
change of operating state and without damage
Resistor-diode element
Combination of blocking diodes and resistor in an element block
Safety class
DIN EN 61058 T. 1 (VDE 0630 T. 1 ) para. 3.7 .6 ff => Designates a classification of
Switchgear, in which protection against electric shock is based on the base
insulation (i.e: Safety class 0)