TRA294G/20-25 Cynergy3 Components, TRA294G/20-25 Datasheet - Page 10

• 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

Permanent Magnet areas of Operation
Reed Switch
Application Notes
Magnets
Part Number system
The materials used for Reed Switch magnets are generally ALNICO (an
aluminium nickel cobalt alloy), ceramic (barium ferrite or another
metal oxide) or rare earth magnets. Due to their specific magnetic
characteristics, the types of magnets differ in shape: ALNICO magnets
are bar magnets with a length/diameter ratio of 3/1 to 5/1; oxide
magnets are generally disc or moulded magnets. Also important to
note is the difference in temperature coefficient:
ALCO: 0.02 %/K, oxide: 0.2 %/K
In General:
The sensitivity of a reed switch is a measurement of the magnetic
energy required to operate the switch. The unit of measurement is
Ampere-Turns(AT), which is the current in a given coil multiplied the
number of turns on that coil.
Manufacturers of reed switches will set their machines such that they
aim to produce a particular operate AT but, due to tolerances in
materials, machinery and operator control, the switches produced will
have a range of operate AT. The reed switches are then measured and
sorted into bands of AT, and stocked in those bands.
Example :
DRA282G = Standard size - Rhodium contact - N/O - Non-pressurised - High Power Contact - Operate Sensitivity 60 - 70 AT.
C = Compact
D = Standard
M = Miniature
S = Subminiature
T = Tiny
V = Very Tiny
x-
Switch Size
10
x-
N
holding
on
y
R = Rhodium
T = Tungsten
D = Durel
y
Materials
S
Contact
off
x+
x+
Contact Form
A = N/O
C = C/O
z-
z-
D R A 2 8 2 G / 60-70
2 = Non-Pressurised
5 = Pressurised
holding
on
S
Pressure
y
y
Switch
For each Reed Switch type the available range of operate sensitivity is
given in the data table.
Other operate sensitivities are available on request.
Life Expectancy:
The life expectancy of a Reed Switch is about 10 ...10 switching cycles
with maximum power. With a low load the life expectancy can reach
5x10 operations. The mechanical life expectancy can reach at least
10 operations. The Life Expectancy is considerably reduced, through
the switching of Inductive, Capacitive and Lamp loads, due to the
maximum current being exceeded.
Pull In Sensitivity Tolerance:
The given operate sensitivity of the Reed Switch has a test equipment
tolerance of ± 2 AT.
off
9
8
z+
z+
0 = Standard Performance
1 = Size variant
5 = High Insulation
6 = Increased Power Contact
8 = High Power Contact
9 = Size variant
Operate Sensitivity band in AT
Contact Variant
x-
x-
off
on
N
S
y
5
y
cynergy
on
6
variants
Product
off
x+
x+
components