Axial Lead Reed SwitchesHigh Power > DRS-DTH

DRS-DTH 39.7mm Standard Changeover Reed SwitchRoHSDescription
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 10 9 ohms minimum and contact resistance of lessthan 125 milli-ohms.

FeaturesAgency Approvals
AgencyAgency File Number

Ampere-Turns Range

E47258E471070

50-80 AT• Changeover switch• Capable of switching 500Vdc
or 0.5A at up to 30W

Note: Contact Littelfuse for specific agency approval ratings.

Dimensions• Available sensitivity range
50-80 ATBenefits• Hermetically sealed switch
contacts are not affected byand have no effect on theirexternal environment

Dimensions in mm (inch)
1.83
0.25
(.010) NOM.
(.072) NOM.
1.27
5.54 CL OF OVERLAP(.050) DIA. REF.
(.218) MAX.

25.40
(1.000) NOM.

• Minimum voltage breakdown
1200Vdc

27.66(1.89) REF.

5.33(.210) MAX.

• Capable of switchingEuropean mains voltage• Zero operating power
required for contact closure• Can be used as changeoveror normally closed contact

1.02(.040) DIA. REF.

12.45(.490) NOM.
38.10 - 39.67(1.500) NOM. - (1.562) MAX.
85.73 - 84.14(3.375) NOM. - (3.3125) MIN.

Switch Type

Applications• Security• Limit switching• Industrial safety applications• White goods applications

Contact Form

C (SPDT-CO)
Body: Glass

Materials

Leads: Tin-plated Ni-Fe wire

Note: SPDT-CO = Single-Pole, Double-Throw, Change OverElectrical Ratings
Contact Rating 1Voltage 3Current 3

Switching 2
Breakdown 4
Switching 2
CarryResistanceContact, Initial Insulation

CapacitanceContact

Temperature

OperatingStorage 5

W/VA - max.

30

Vdc - max.

500

Vac - max.

350

Vdc - min.

1200

Adc - max.

0.50

Aac - max.

0.35

Adc - max.

3.0

Ω - max.

0.125
109

Ω - min.
pF - typ.

2.0°C-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.
© 2020 Littelfuse, Inc.
5. Storage Temperature - Long time exposure at elevated temperature may degrade solderability of the leads.
Specifications are subject to change without notice.
Revised: BO/12/08/20

Axial Lead Reed SwitchesHigh Power > DRS-DTH

DRS-DTH 39.7mm Standard Changeover Reed Switch
Product Characteristics
Operating Characteristics
Operate Time 1-4.5ms - max.
7.0ms - max.

Shock 2

11ms 1∕2 sine wave

Vibration 250-2000 Hertz

15G - max.

Resonant Frequency

Hz - typ.

2.75kHz - typ.

Ampere Turns

50-80

Release Time 1

Magnetic Characteristics
Pull-In Range 3

10G - max.

Rating Sensitivity 4

Ampere Turns

60

Test Coil-L4988

Drop-Out

Ampere-Turns - min.

-Notes:
1. Operate (including bounce)/Release Time - per EIA/NARM RS-421-A,diode suppressed coil (Coil IV).
2. Shock and Vibration - per EIA/NARM RS-421-A and MIL-STD-202.
3. Pull-In Range - Contact Littelfuse for narrower AT ranges available.
4. Rating Sensitivity - The value at which contact ratings and operating characteristics are determined. Derating may be required below this value.
5. Custom modifications of forming and/or cutting of reed switches are available. Please contact Littelfuse.

Drop-Out vs. Pull-In Chart

Part Numbering System

DRS-DTH-50-80

7060

Drop-Out (L4988 Coil)

50

Series40

AT Range
50-55 AT
50-60 AT
50-80 AT
55-60 AT
55-65 AT
65-70 AT
65-80 AT
70-75 AT70-80 AT
75-80 ATMax.

30Min.
201000102030405060708090

Pull-In (L4988 Coil)

Note: Chart represents the range of Drop-Out, min to max for a given Pull-In value.

Example:50-80 AT product is
DRS-DTH-50-80

Note: These AT values are the before-modification values of the bare reed switch.

Packaging
Packaging Option

Packaging Specification

Quantity

Quantity & Packaging Code

Taping Width

Bulk

Bulk

1000--Disclaimer Notice - Information furnished is believed to be accurate and reliable. However, users should independently evaluate the suitability of and test each product selected for their own applications. Littelfuse products are notdesigned for, and may not be used in, all applications. Read complete Disclaimer Notice at www.littelfuse.com/disclaimier-electronics.
© 2020 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: BO/12/08/20