TRA294G/20-25 Cynergy3 Components, TRA294G/20-25 Datasheet - Page 6

• Manufacturer Part Number: TRA294G/20-25
• Description: Switch, Reed, NO, 10VA, 150V, .5A
• Manufacturer: Cynergy3 Components

Specifications of TRA294G/20-25

• Lead Free Status / Rohs Status: RoHS Compliant part

Cynergy3 Components Ltd
7 Cobham Road
Ferndown Industrial Estate
Wimborne
Dorset BH21 7PE
Tel:
Fax: [phone]
[e-mail]
www.cynergy3.com
6
[phone]
Permanent Magnets for Reed Switch Operation
All of these magnets are polarised along their length.
Actuation of Reed Switches with a
Direct Actuation:
A magnet moved perpendicularly
towards and away from a Reed
Switch turns it on and off once.
A magnet moved parallel to a Reed
Switch operates it from one to three
times.
A magnet swung towards and away
from a Reed Switch operates it
once.
A ring magnet moved parallel to
the Reed Switch axis operates it
from one to three times.
A range of magnets is available for operating the Crydom Magnetics range of reed switches. The selection of the correct
combination of magnets and reeds switches, for a particular application, will normally be made on an empirical basis as intricate
calculations are not necessary.
The following table of magnet types and accompanying graphs act as a guide to the relationship between switch sensitivity and
magnet type. These figures can only be taken as a rough indication, due to the fact that magnets are manufactured to
commercial tolerances.
Details of Crydom Magnetics Reed Switches are listed on separate sheets, available on request.
Number
RSH01
RSH02
RSH32
RSH33
RSH34
RSH73
RSH74
Type
12.7
31.7
27.9
19.1
25.4
12.7
52.9
mm
'A'
Length 'A'
'CYLINDRICAL'
closed
inches
1.25
1.10
0.75
1.00
2.08
closed
0.5
0.5
open
ring magnet
N
N
N
N
magnet
magnet
Nominal Dimensions mm/ins
S
10.2
mm
3.2
6.4
4.8
3.2
6.4
3.2
S
S
S
Magnet Types
closed
open
Length 'B'
open
Diameter
Diameter
Rotation:
Examples of switching through rotational movement:
Indirect Actuation: Shielding
With the stationary arrangement of a Reed Switch and magnet, the
reed contacts are closed. Should the magnetic field be diverted away
from the Reed Switch by a shield of ferro-magnetic material placed
between the switch and the magnet, the contacts will open. When the
shield is removed, the reed contacts become magnetically actuated
and close.
inches
0.125
0.187
0.125
0.125
0.25
0.25
0.40
open
N
'C'
mm
1.6
6.4
4.8
3.2
6.4
magnet
'A'
N
S
magnet
Length 'C'
S
closed
inches
0.063
0.187
0.125
0.25
0.25
'BAR'
magnetic shield
'B'
open
open
S
N
closed
Total Magnetic
magnet
Flux
closed
µWb
4.0
5.5
28
22
30
71
9