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RI-08 Series Dry Reed Switch
RI-08 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 sensors, relays, pulse counters or similar
devices.
RI-08 Series Features
Can switch main voltage
Can handle up to 40W load
Contact layers: Ruthenium on gold
Superior glass-to-metal seal and blade alignment
General data for all models RI-08
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 1.5 times the published maximum operate
value for each type in the RI-08 series.
No-load conditions (operating frequency: 100 Hz)
Life expectancy: min. 108 operations with a failure rate
of less than 10-9 with a confidence level of 90%.
End of life criteria:
Contact resistance > 1Ω after 2 ms
Release time > 2 ms (latching or contact sticking).
Loaded conditions (resistive load: 20 V; 500 mA;
operating frequency: 125 Hz)
RI-08AA
Life expectancy: min. 106 operations.
End of life criteria:
Contact resistance > 2Ω after 2.5 ms
Release time > 2.5 ms (latching or contact sticking).
Switching different loads involves different life expect-
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 280 mg; and can be
mounted in any position.
Shock
The switches are tested in accordance with “IEC
68-2-27”, 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,
Dimensions in inches (mm)
125
For Most Recent Data, Consult the Coto Technology Website: www.cotorelay.com 6 E-mail: info@cotorelay.com
RI-08 Series Dry Reed Switch
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
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.
Mechanical Strength
The robustness of the terminations is tested in accor-
dance 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
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.
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.
Model Number
RI-08AA RI-08A RI-08B
Parameters Test Conditions Units
Operating Characteristics
Operate Range AT 10.5-19 15-28 24-51
Release Range AT 4-12 5-16 8-20.5
Operate Time - including bounce (typ.) (energization) ms 0.35 (24AT) 0.35 (35AT) 0.35 (64AT)
Bounce Time (typ.) (energization) ms 0.15 (24AT) 0.15 (35AT) 0.15 (64AT)
Release Time (max) (energization)
µ
s30 (24AT) 30 (35AT) 30 (64AT)
Resonant Frequency (typ.) Hz 3200 3200 3200
Electrical Characteristics
Switched Power (max) W 30 30 40
Switched Voltage DC (max) V 200 200 200
Switched Voltage AC, RMS value (max) V 200 200 250
Switched Current DC (max) mA 750 1000 1000
Switched Current AC, RMS value (max) mA 750 1000 1000
Carry Current DC (max) A 1.75 2.25 3.0
Breakdown Voltage (min) V 300 400 580
Contact Resistance (initial max) (energization) m
Ω
120 (27 AT) 120 (27AT) 120 (36 AT)
Contact Resistance (initial typ.) (energization) m
Ω
90 (27 AT) 90 (27 AT) 90 (36 AT)
Contact Capacitance (max) without test coil pF 0.20 0.20 0.20
Insulation Resistance (min) RH
≤
45% M
Ω
10
6
10
6
x10
6
