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DRS-DTH

39.7mm Standard Changeover Reed Switch

Littelfuse, Inc 

Axial Lead Reed Switches

High Power > DRS-DTH

DRS-DTH 39.7mm Standard Changeover Reed Switch

RoHS

Description

The DRS-DTH Reed Switch is a large changeover switch with a

39.67mm long x 5.33mm diameter (1.562” x 0.210”) glass

envelope, capable high voltage and power switching up to 500Vdc

at 2mA, or 0.5A up to 30W/VA. The DRS-DTH has an insulation

resistance of 109 ohms minimum and contact resistance of less

than 125 milli-ohms.

Agency Approvals

Agency

Agency File Number

E47258

E471070

Note: Contact Littelfuse for specific agency approval ratings.

Ampere-Turns Range

50-80 AT

Dimensions

Dimensions in mm (inch)

1.83

(.072) NOM.

0.25

(.010) NOM.

1.27

(.050) DIA. REF.

5.54 CL OF OVERLAP

(.218) MAX.

27.66

(1.89) REF.

5.33

(.210) MAX.

25.40

(1.000) NOM.

12.45

(.490) NOM.

38.10 - 39.67

(1.500) NOM. - (1.562) MAX.

85.73 - 84.14

(3.375) NOM. - (3.3125) MIN.

1.02

(.040) DIA. REF.

Applications

• Security

• Limit switching

• Industrial safety applications

• White goods applications

Electrical Ratings

Features

• Changeover switch

• Capable of switching 500Vdc

or 0.5A at up to 30W

• Minimum voltage breakdown

1200Vdc

• Available sensitivity range

50-80 AT

Benefits

• Hermetically sealed switch

contacts are not affected by

and have no effect on their

external environment

• Can be used as changeover

or normally closed contact

• Capable of switching

European mains voltage

• Zero operating power

required for contact closure

Switch Type

Contact Form

Materials

C (SPDT-CO)

Body: Glass

Leads: Tin-plated Ni-Fe wire

Note: SPDT-CO = Single-Pole, Double-Throw, Change Over

Contact Rating 1

Voltage 3

-

Switching 2

Breakdown 4

W/VA - max.

Vdc - max.

Vac - max.

Vdc - min.

30

500

350

1200

Current 3

Resistance

Capacitance

Temperature

Switching 2

Carry

Contact, Initial Insulation

Contact

Operating

Storage 5

Adc - max.

Aac - max.

Adc - max.

Ω - max.

Ω - min.

pF - typ.

°C

0.50

0.35

3.0

0.125

109

2.0

-20 to +125

-65 to +125

Notes:

1. Contact rating - Product of the switching voltage and current should never exceed the wattage rating. Contact Littelfuse for additional load/life information.

2. When switching inductive and/or capacitive loads, the effects of transient voltages and/or currents should be considered. Refer to Application Notes AN108A and AN107 for details.

3. Electrical Load Life Expectancy - Contact Littelfuse with voltage, current values along with type of load.

4. Breakdown Voltage - per MIL-STD-202, Method 301.

5. Storage Temperature - Long time exposure at elevated temperature may degrade solderability of the leads.

© 2020 Littelfuse, Inc.

Specifications are subject to change without notice.

Revised: BO/12/08/20

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