COTO RI-48

RI-48 Series Dry Reed Switch
RI-48 Series
Micro dry-reed switch hermetically sealed in a gas-filled glass envelope.
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 relays for switching power loads and
high stand-off voltage applications.
RI-48 Series Features
Perfect heavy load switch
Can handle loads up to 70 Watts
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-48
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.
Loaded conditions (resistive load: 20 V; 500 mA;
operating frequency: 125 Hz)
RI-48AA
Life expectancy: min. 107 operations with a failure rate
of less than 10-8 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-48A; RI-48B; RI-48C
Life expectancy: min. 2.5 x 107 operations with a failure
The life expectancy data given below are valid for a coil rate of less than 10-8 with a confidence level of 90%.
energized at 1.5 times the published maximum operate End of life criteria:
Contact resistance > 2Ω after 2.5 ms
value for each type in the RI-48 series.
Release time > 2.5 ms (latching or contact sticking).
No-load conditions (operating frequency: 100 Hz)
Life expectancy: min. 108 operations with a failure rate Loaded conditions (resistive load: 100 V-700 mA;
operating frequency: 20 Hz)
of less than 10-9 with a confidence level of 90%.
Life expectancy and reliability
End of life criteria:
Contact resistance > 1Ω after 2 ms
Release time > 2 ms (latching or contact sticking).
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RI-48B; RI-48C
Life expectancy: min. 3x105 operations with a failure
rate of less than 10-6 with a confidence level of 90%.
COTO TECHNOLOGY (USA) Tel: (401) 943-2686 / Fax (401) 942-0920
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(Europe) Tel: +31-45-5439343 / Fax +31-45-5427216
RI-48 Series Dry Reed Switch
End of life criteria:
Contact resistance > 1.5Ω after 2.5 ms.
Release time > 2.5 ms (latching or contact sticking).
Switching different loads involves different life expectancy and reliability data. Further information is available on request.
Mechanical Data
Contact arrangement is normally open; lead finish is
tinned; net mass is approximately 280 mg; and can be
mounted in any position.
Mechanical Strength
The robustness of the terminations is tested in accordance with “IEC 68-2-21”, test Ua1 (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
Shock
The switches are tested in accordance with “IEC 68-227”, test Ea (peak acceleration 500 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.
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 1b: 4 hours
steam.
Vibration
Welding
The switches are tested in accordance with “IEC 68-26”, test Fc (acceleration 10 G; below cross-over frequency 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.
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
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E-mail: sales@cotorelay.com
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