DRT-DTH Datasheet, PDF (1/2 Pages) Littelfuse – Axial Lead Reed Switches

Axial Lead Reed Switches
High Power > DRT-DTH
DRT-DTH 39.7mm Standard Changeover Reed Switch
RoHS
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.
Description
The DRT-DTH Reed Switch is a standard changeover switch with a 39.67mm long
x 5.33mm diameter (1.562” x 0.210”) glass envelope, with tungsten contacts
capable of high voltage and power switching up to 500Vdc at 50W. It has the
insulation resistance of 10⁹ ohms minimum and contact resistance less than
500 milli-ohms.
Features
• Changeover switch
• Capable of switching 500Vdc or
1.5A at up to 50W
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
• Minimum voltage breakdown
1000Vdc
• Available sensitivity range
50-80 AT
• Capable of switching European
mains voltage
• Zero operating power required for
contact closure
Applications
• Security
• Limit switching
• Industrial safety applications
• White goods applications
Switch Type
Contact Form
C (SPDT-CO)
Materials
Body: Glass
Leads: Tin-plated Ni-Fe wire
Note: SPDT-CO = Single-Pole, Double-Throw, Change Over
Electrical Ratings
Contact Rating ¹
Voltage ³
Current ³
Resistance
Switching ²
Breakdown ⁴
Switching ²
Carry
Contact, Initial
Insulation
W/VA - max.
Vdc - max.
Vac - max.
Vdc - min.
Adc - max.
Aac - max.
Adc - max.
Ω - max.
Ω - min.
50
500
350
1000
1.5
1.0
2.0
0.500 ⁶
10⁹
Capacitance
Contact
pF - typ.
2.0
Temperature
Operating
Storage ⁵
°C
-20 to +125
°C
-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.
6. Contact resistance measured at 36Vdc, 100mA, switched wet.
7. Not recommended for small electrical loads.
© 2015 Littelfuse
Revised: 11/02/15
Specifications are subject to change without notice.
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