littelfuse.com© 2015 Littelfuse Revised: 11/02/15
Specifications are subject to change without notice.
DRR-DTH 39.7mm Standard Changeover Reed Switch
Description
The DRR-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 30W. The DRR-DTH has an insulation
resistance of 10
9
ohms minimum and contact resistance of less than
125 milli-ohms.
The DRT-DTH Reed Swith, another varient of the DRR-DTH, is made for
heavier loads.
Switch Type
Contact Form C (SPDT-CO)
Materials
Body: Glass
Leads: Tin-plated Ni-Fe wire
Axial Lead Reed Switches
Features
• Changeover switch
• Capable of switching 500Vdc or
0.5A at up to 30W
• Minimum voltage breakdown
1200Vdc
• Available sensitivity range
50-80 AT
• Minimum voltage breakdown
1200Vdc
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
Applications
• Security
• Limit switching
• Industrial safety applications
• White goods applications
Dimensions
Dimensions in mm (inch)
High Power > DRR-DTH
RoHS
Electrical Ratings
Contact Rating
1
W/VA - max. 30
Voltage
3
Switching
2
Breakdown
4
Vdc - max.
Vac - max.
Vdc - min.
500
350
1200
Current
3
Switching
2
Carry
Adc - max.
Aac - max.
Adc - max.
0.50
0.35
3.0
Resistance
Contact, Initial
Insulation
Ω - max.
Ω - min.
0.125
10
9
Capacitance Contact pF - typ. 2.0
Temperature
Operating
Storage
5
°C
°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.
5. Storage Temperature - Long time exposure at elevated temperature may degrade solderability of the leads.
1.83
(.072) NOM.
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.
0.25
(.010) NOM.
CL OF OVERLAP
5.54
(.218) MAX.
27.66
(1.89) REF.
5.33
(.210) MAX.
1.02
(.040) DIA. REF.
1.27
(.050) DIA. REF.
Note: SPDT-CO = Single-Pole, Double-Throw, Change Over
