littelfuse.com© 2018 Littelfuse Revised: 01/31/18
Specifications are subject to change without notice.
DRR-129 50.8mm Close-Differential Reed Switch
Description
The DRR-129 Reed Switch is a standard, normally open switch with a 50.80mm
long x 5.25mm diameter (2.000” x .207”) glass envelope, capable of high voltage
and power switching up to 400Vdc at 100W. Will carry 6A and switch 3A. It has
high insulation resistance of 1010 ohms minimum and contact resistance of less
than 100 milli-ohms.
Agency Approvals
Agency Agency File Number Ampere-Turns Range
E47258
E471070 42-83 AT
DEMKO 14 ATEX 1393U 42-83 AT
Switch Type
Contact Form A (SPST-NO)
Materials Body: Glass
Leads: Tin-plated Ni-Fe wire
Axial Lead Reed Switches
Features
• Normally open switch
• Capable of switching 400Vdc or
3.0A at up to 100W
• Minimum voltage breakdown
600Vdc
• Available sensitivity range
42-83 AT
Benefits
• Hermetically sealed switch
contacts are not affected by and
have no effect on their external
environment
• Capable of switching European
mains voltage
• Zero operating power required for
contact closure
Applications
• Security
• Limit switching
• Industrial safety applications
Dimensions
Dimensions in mm (inch)
High Power > DRR-129
RoHS
Note: SPST-NO = Single-pole, single-throw, normally open
Electrical Ratings
Contact Rating 1W/VA - max. 100
Voltage 3
Switching 2
Breakdown 4
Vdc - max.
Vac - max.
Vdc - min.
400
280
600
Current 3
Switching 2
Carry
Adc - max.
Aac - max.
Adc - max.
3.0
2.1
6.0
Resistance Contact, Initial
Insulation
Ω - max.
Ω - min.
0.100
1010
Capacitance Contact pF - typ. 0.6
Temperature Operating
Storage 5
°C
°C
-40 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
41.27
(1.625) REF.
12.70
(.500) REF.
15.24
(.600) MIN.
50.80
(2.000) MAX.
82.55
(3.250) MAX.
5.25
(.207) MAX.
0.53
(.021) REF.
CL OF OVERLAP
Note: Contact Littelfuse for specific agency approval ratings.
07/17/2017 N/A
DRS-50
littelfuse.com© 2018 Littelfuse Revised: 01/31/18
Specifications are subject to change without notice.
Drop-Out vs. Pull-In Chart
Packaging
Packaging Option Packaging Specification Quantity Quantity & Packaging Code Taping Width
Bulk Bulk 1000 N/A N/A
Product Characteristics
Operating Characteristics
Operate Time 14.5ms - max.
Release Time 12.5ms - max.
Shock 211ms 1∕2 sine wave 100G - max.
Vibration 250-2000 Hertz 30G - max.
Resonant Frequency Hz - typ. 850Hz - typ.
Part Numbering System
Notes:
1. Operate (including bounce)/Release Time - per EIA/NARM RS-421-A,diode suppressed coil (Coil II).
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.
Axial Lead Reed Switches
High Power > DRR-129
DRR-129 50.8mm Close-Differential Reed Switch
DRR-129-42-83
Series
AT Range
42-48 AT
42-53 AT
42-83 AT
47-53 AT
47-58 AT
47-68 AT
57-63 AT
57-68 AT
62-68 AT
62-78 AT
67-73 AT
67-83 AT
77-83 AT
62-73 AT
Example:
42-83 AT product is
DRR-129-42-83
Note: Chart represents the range of Drop-Out, min to max for a given Pull-In value.
Note: These AT values are the before-modification values of the bare reed switch.
Magnetic Characteristics
Pull-In Range 3Ampere Turns 42-83
Rating Sensitivity 4Ampere Turns 60
Test Coil L4988
10
0
20
30
40
50
100
Pull-In (AT, L4988 Coil)
Drop-Out (AT, L4988 Coil)
20 30 40 50 60 70 80
90
Max.
Min.
