6721-40 HERGA, 6721-40 Datasheet - Page 5

• Manufacturer Part Number: 6721-40
• Description: VACUUM SWITCH
• Manufacturer: HERGA

Specifications of 6721-40

• Connection Size: 4mm
• Contact Configuration: SPCO
• Contact Current @ Contact Voltage Ac Min: 21A
• Contact Current Ac Max: 21A
• Contact Voltage Ac Max: 250V
• External Diameter: 43mm
• External Length / Height: 38mm

6702 ~ High Pressure Switch
6702 Pressure Switch
The industrial pressure switch is moulded entirely in plastic with the
exception of the pressure connection and is water, oil and dust proof to
IP65. The switches have excellent repeat accuracy, even over widely
varying ambient conditions.
The operating pressure is adjustable externally using the thumb screw on
the top and the approximate pressure setting can be seen through a window
in the cover. To discourage unauthorised tampering, the adjusting screw can
be locked in position with an M1.5mm Allen screw.
The microswitches have independent vernier adjustment and are normally
set to operate within 2 PSI on rising pressure. Where two pressure levels
are to be controlled, the switches can be adjusted separately so that one
switch will operate at up to 80% of the level of the second. The switches can
also be set to operate simultaneously on falling pressure instead of rising
pressure.
The pressure switch is of Class II construction with double insulation.
For quantity orders, many special options are available, please enquire:-
Other Information
Silver Contact Microswitch Data
Gold Contact Microswitch Data
Switch Standards:
Approvals Available:
1999
As a consequence of our policy of continual improvement, we reserve the right to change without notice any detail in this publication. Please see our Conditions of Sale.
UL/CSA Only
Withstand pressure
Setting accuracy when set by herga
Temperature range
Diaphragm
Weight
Average Life
Expectancy
Average Life
Expectancy
Electrical Rating
Electrical Rating
Single or double pole switching set to specific pressure levels
Alternative connector sizes
Alternative diaphragms and metal chambers to resist particular fluids
Installation and setting instructions are supplied with each product
DC
AC
AC
Mechanical
Electrical
Mechanical
Electrical
Voltage
Voltage
250V
250V
125V
220V
250V
125V
110V
12V
24V
60V
6V
EN 60730, EN 61058 and UL 508
CE, BEAB, CSA, DEMCO, IMQ, KEMA, NEMCO,
OVE, SEMCO, SET I, SEV, UL, VDE
FOR FURTHER INFORMATION TEL: [phone] FAX: [phone]
0.25A
0.5A
2.0 x 10
0.1A
0.1A
Res.
Res.
2.0 x 10
21A
21A
21A
21A
15A
8A
1A
Max. Electrical Load
Max. Electrical Load
500 PSI (34.5 Bar)
± 10%
-5˚C to +70˚C
Fabric reinforced Nitrile
300g
5
5
@ 10A 1.0 x 10
@ 10A 1.0 x 10
1.0 x 1.0
1.0 x 10
0.5A
0.2A
0.1A
0.05
21A
15A
-----
Ind.
Ind.
8A
7A
6
6
(Pf 0.75 Motor)
(Pf 0.75 Motor)
4
4
@ 21A
@ 21A
1HP
2HP
N/A
-----
Suitability for use with different operating media
Pressure Medium
Note: Dry Switching - if switching low power circuits, low current (4 to
100 milliamperes) and low voltage (below 30V), consult herga or refer
to gold contact in section 4 of the opposite page.
Herga do not accept liability for any pressure operated device used
outside the pressure range specified by the company.
Acetone
Ammonia (Liquid)
Amyl Alcohol to 20˚C
Automotive Brake Fluid
Beer
Butane
Carbon Dioxide (Dry)
Citric Acid
Copper Sulphate (Sol.)
Compressed Air
Cutting Oil
Diesel Oil
Detergent Solution
Fuel Oil
Glycol
Hydraulic Oil
Hydrogen
Lubricating Oil
Milk
Mineral Oil
Natural Gas
Oxygen to 70˚C
Petrol
Plating Solution (Chrome)
Salt Water
Sewage
Turpentine
Vinegar
Water
= Recommended
Note: differentials are approximate
= Suitable with modifications
ISSUE 01
6702