704.908.3 EAO, 704.908.3 Datasheet - Page 79

• Manufacturer Part Number: 704.908.3
• Description: Snap-action Switching Element, 2NO, Push-In Terminals, Silver
• Manufacturer: EAO

Specifications of 704.908.3

• Contact Configuration: DPST-NO
• Microswitch Type: Snap Action
• Contact Voltage Ac Nom: 250V
• Contact Current Max: 6A
• Switch Terminals: Plug-In
• Circuitry: DPST-NO
• Features: Snap-Action

Technical Data
Switching system
Material
Mechanical characteristics
0
Electrical characteristics
Snap-action switching element
The double-break, snap-action switching element is equipped with
one or two independent contact systems, acting as normally open
or normally closed contact. The snap-action switching element is
fitted with self-cleaning contacts.
Up to three switching elements can be snapped to each actuator.
Snap-action switching elements are not permissible for emergency-
stop pushbuttons!
Material of contact
Hardsilver, gold-silver, silver-palladium (for aggressive
atmospheres)
Switch housing
Polycarbonate (PC)
Terminals
Screw terminals
Plug-in terminals 6.3 x 0.8 mm
max. wire cross-section 2 x 2.5 mm²
max. wire cross-section of stranded cable 2 x 1.5 mm²
For switches with plug-in terminals it is necessary to provide
insulation sleeves and to maintain a spacing of 65 mm between
rows (mounting dimensions)
Tightening torque
Screws at the mounting flange max. 25 Ncm
Screws at switching element max. 50 Ncm
Actuating force
1 Normally closed 1.9 N
1 Normally open 2 N
Actuating travel
5.8 mm ± 0.2 mm
Rebound time
≤3 ms
Mechanical lifetime
(with 1 switching element)
Pushbutton maintained action
Pushbutton momentary action
Selector switch maintained action 1.25 million Cycles of operation
Selector switch momentary action 2.5 million
Keylock switch maintained action 25 000
Keylock switch momentary action 50 000
Standards
The switches comply with the "Standards for low-voltage switching
devices" EN IEC 60947-5-1
Rated Insulation Voltage U
500 VAC / 600 VDC, as per EN IEC 60947-5-1
Contact resistance
New state ≤50 mΩ as per DIN IEC 60512-2-4
i
1.5 million
3 million
Cycles of operation
Cycles of operation
Cycles of operation
Cycles of operation
Cycles of operation
0
0
0
0
Environmental conditions
Approvals
Isolation resistance
≥10 MΩ between open contacts at 500 VDC, as per DIN IEC 60512-
2-10
Electrical life
50 000 cycles of operations
Conventional free air thermal current I
10 A, as per EN IEC 60947-5-1
the maximum current in continuous operation and at ambient
temperature must not exceed the quoted maximum values.
Switch rating
At switch rating AC for gold-silver, silver-palladium and hardsilver
contacts, service category AC-15, as per EN IEC 60947-5-1 (cosφ
0.3)
Voltage
Current
At switch rating DC for gold-silver and hardsilver contacts, service
category DC-13, as per EN IEC 60947-5-1
Voltage
Current
Recommended minimum operational data
Gold-silver contacts:
Voltage
Current
Hardsilver contacts:
Voltage
Current
Protection class
Indicators and switches, fit for mounting into devices with protection
class II
Storage temperature
-40 °C ... +85 °C
Operating temperature
-40 °C ... +55 °C
Protection degree
IP 20
Shock resistance
(single impacts, semi-sinusoidal)
300 m/s²puls width 11 ms, as per EN IEC 60068-2-27
Vibration resistance
(sinusoidal)
100 m/s² at 10 Hz ... 500 Hz, amplitude 0,75 mm, as per EN IEC
60068-2-6
Approbations
CB (IEC 60947)
CCC
CSA
Germanischer Lloyd
GOST
NFF 16-102
SEV
UL
230 VAC
6 A
24 VDC
10 A
5 VDC
15 mA
24 VDC
50 mA
24 VDC
5 mA
60 VDC
3 A
110 VDC
10 mA
400 VAC
4 A
110 VDC
2 mA
110 VDC
1 A
500 VAC
2.5 A
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