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6 (Europe) Tel: +31-45-5439343 / Fax +31-45-5427216

RI-21 Series Dry Reed Switch

RI-21 Series

Micro dry-reed switch hermetically sealed in a gas-filled 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-21 Series Features

General purpose reed switch

High breakdown voltage

Contact layers: gold, plated ruthenium

Superior glass-to-metal seal and blade alignment

Excellent life expectancy and reliability

General data for all models RI-21

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-21 series.

No load conditions (operating frequency: 100Hz)

End of life criteria:

Contact resistance > 1

Ω after 2 ms

Release time > 2 ms (latching or contact sticking).

Loaded conditions (resistive load: 12 V; 4 mA;

(15 mA peak); operating frequency: 170 Hz)

End of life criteria:

Contact resistance > 2

Ω after 4 ms

Release time > 0.7 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 190 mg; and can be

mounted in any position.

Dimensions in inches (mm)