RI-25 Series Dry Reed Switch
RI-25 Series
Micro dry-reed switch hermetically sealed in a gas-filled glass enve-
lope. Single-pole, single-throw (SPST) type, having normally open
contacts, and containing two magnetically actuated reeds.
The switch is of the double-ended type and may be actuated by an
electromagnet, a permanent magnet or a combination of both.
The device is intended for use in high load applications in relays or
switching devices.
RI-25 Series Features
Can handle up to 25 W load
Contact layers: gold, sputtered ruthenium
Superior glass-to-metal seal and blade alignment
Excellent life expectancy and reliability
Dimensions in inches (mm)
General data for all models RI-25
AT-Customization / Preformed Leads
Besides the standard models, customized products can
also be supplied offering the following options:
!
Operate and release ranges to customer
specification
!
Cropped and/or preformed leads
Coils
All characteristics are measured using the Philips
Standard Coil. For definitions of the Philips Standard
Coil, refer to “Application
Notes”
in the
Reed Switch
Technical & Application Information
Section of this
catalog.
Life expectancy and reliability
The life expectancy data given below are valid for a coil
energized at 1.25 times the published maximum operate
value for each type in the RI-25 series.
No-load conditions (operating frequency: 100 Hz)
Life expectancy: min. 3x10
8
operations with a failure
rate of less than 0.9x10
-9
with a confidence level of
90%.
End of life criteria:
Contact resistance > 1Ω after 2 ms
112
Release time > 2ms (latching or contact sticking).
Loaded conditions (resistive load: 20 V; 500 mA;
operating frequency: 125 Hz)
RI-25AAA
Life expectancy: min. 10
6
operations with a failure rate
of less than 2.5x10
-7
with a confidence level of 90%.
End of life criteria:
Contact resistance > 2Ω after 2.5 ms
Release time > 2.5 ms (latching or contact sticking).
RI-25AA; RI-25A; RI-25B; RI-25C
Life expectancy: min. 5x10
7
operations with a failure
rate of less than 5x10
-9
with a confidence level of 90%.
End of life criteria:
Contact resistance > 2Ω after 2.5 ms
Release time > 2.5 ms (latching or contact sticking).
Loaded conditions (resistive load: 50 V; 100mA;
operating frequency: 50 Hz)
Life expectancy: min. 10
6
operations with a failure rate
of less than 2x10
-7
with a confidence level of 90%.
End of life criteria:
Contact resistance > 1Ω after 5 ms
Release time > 2 ms (latching or contact sticking).
Switching different loads involves different life expect-
6
(Europe) Tel: +31-45-5439343 / Fax +31-45-5427216
COTO TECHNOLOGY (USA)
Tel:
(401) 943-2686 / Fax (401) 942-0920
RI-25 Series Dry Reed Switch
ancy and reliability data. Further information is avail-
able on request.
Mechanical Data
Contact arrangement is normally open; lead finish is
tinned; net mass is approximately 190 mg; and can be
mounted in any position.
Shock
The switches are tested in accordance with “IEC 68-2-
27”, test Ea (peak acceleration 150 G, half sinewave;
duration 11 ms). Such a shock will not cause an open
switch (no magnetic field present) to close, nor a switch
kept closed by an 80 AT coil to open.
Vibration
The switches are tested in accordance with “IEC 68-2-
6”, test Fc (acceleration 10 G; below cross-over fre-
quency 57 to 62 Hz; amplitude 0.75 mm; frequency
range 10 to 2000 Hz, duration 90 minutes). Such a
vibration will not cause an open switch (no magnetic
field present) to close, nor a switch kept closed by an
80 AT coil to open.
Mechanical Strength
The robustness of the terminations is tested in accor-
dance with “IEC 68-2-21”, test Ua
1
(load 40 N).
Operating and Storage Temperature
Operating ambient temperature; min: -55°C; max:
+125°C. Storage temperature; min: -55°C; max:
+125°C.
Note:
Temperature excursions up to 150°C
may be permissible. For more information contact your
nearest Coto Technology sales office.
Soldering
The switch can withstand soldering heat in accordance
with “IEC 68-2-20”, test Tb, method 1B: solder bath at
350 ±10°C for 3.5 ±0.5 s. Solderability is tested in
accordance with “IEC 68-2-20”, test Ta, method 3:
solder globule temperature 235°C; ageing Ib: 4 hours
steam.
Welding
The leads can be welded
Mounting
The leads should not be bent closer than 1 mm to the
glass-to-metal seals. Stress on the seals should be
avoided. Care must be taken to prevent stray magnetic
fields from influencing the operating and measuring
conditions.
For Most Recent Data, Consult the Coto Technology Website:
www.cotorelay.com
6
E-mail: sales@cotorelay.com
113
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