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RI-91 Series Dry Reed Switch

RI-91 Series

10W changeover dry-reed switch hermetically sealed in a gas-filled envelope.

Single-pole, double-throw (SPDT) type, having a normally open and a normally

closed contact.

The switch 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-91 Series Features

▪ Ideal for ATE relays and proximity sensors

▪ Contact layers: Ruthenium on gold

▪ 10 W, 170 VDC

▪ Excellent life expectancy and reliability

▪ UL#: E125629

Dimensions for RI-91 Series

All Dimension in inches (mm) nominal

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

Test Coils

All characteristics are measured using the Philips Standard Coil

with full length switches.

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-91 series.

No load conditions (operating frequency: 100Hz)

Life expectancy: min. 108 operations with a failure rate of less

than 2 x 10-9.

End of life criteria:

Contact resistance > 1Ω after 2 ms

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

Operating and Storage Temperature

Operating ambient temperature; min: -55°C; max: +125°C.

Storage temperature; min: -55°; max: +125°C. Note: Temperature

excursions up to 150°C may be permissible.

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.

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.

Ordering Information

Group

RI-91 NO:

DC Load [W = V x mA]

B10 [Mcy]

MCTF [Mcy]

10 = 175 x 57

2.2

6.2

10 = 71 x 140

0.60

0.75

10 = 50 x 200

0.60

1.1

10 = 20 x 500

0.22

0.38

RI-91 NC:

DC Load [W = V x mA]

B10 [Mcy]

MCTF [Mcy]

10 = 175 x 57

0.06

1.2

10 = 71 x 140

0.33

0.73

B10 = ‘minimal life expectancy’ at 10% failures.

Mcy = mega cycles or one million operations.

MCTF = mean cycle to failure

Series

AT Range

Options

RI-91GP

15 to 30 AT *Minimum 5 AT Range MOD1

Part Number Example:

RI-91GP 1520

General data for all models RI-91

10W

Form C

Ø.023 MAX

(.60)

Ø.023 MAX

(.60)

.100 MAX (2.54)

.100 MAX (2.54)

1.00 ± .020 (25.4 ± 0.5)

1.00 ± .020 (25.4 ± 0.5)

1.956 ± .019 (49.7 ± 0.5)

.563 MAX (14.3)

.563 MAX (14.3)

1.988 ± .019 (50.5 ± .6)

.685 MAX (17.4)

.059 (1.5) ref

Ø.020 MAX (.50)

Ø.020 MAX (.50)

Ø.020 MAX (.50)

Ø.020 MAX (.50)

.768 (19.5) ref

.059 (1.5)

.003 ± .019 (0.8 ± 0.5)

.738 ± .009 (18.75 ± 0.25)

NC Lead

NC Lead

NO Lead

NO Lead

.100 ± .009 MAX (2.54 ± 0.25)