Axial Lead Reed Switches
High Voltage > MVSR-20
MVSR-20 19.7mm Reed Switch
RoHS
Description
The MVSR-20 reed switch is a miniature, normally open switch with a 19.69mm
long x 2.66mm diameter (0.775” x 0.105”) glass envelope, capable of high voltage
switching of up to 1kVdc at 1mA. It has high insulation resistance of 10¹² ohms
minimum and contact resistance less than 100 milli-ohms.
Features
• Miniature normally open switch
• Capable of switching 1000Vdc at
1mA or 0.5A up to 10W
• Minimum voltage breakdown
2000 Vdc
• Available sensitivity range 17-38 AT
Benefits
Agency Approvals
Agency
Agency File Number
E47258
E471070
DEMKO 14 ATEX 1393U
Note: Contact Littelfuse for specific agency approval ratings.
Ampere-Turns Range
17-38 AT
17-38 AT
• Hermetically sealed switch
contacts are not affected by and
have no effect on their external
environment
• Zero operating power required
for contact closure
Applications
• Reed relays (particularly suitable
for high voltage breakdown
applications)
• Security
• Limit switching
• Telecoms line switching
• Industrial equipment
Dimensions
Dimensions in mm (inch)
CL OF OVERLAP
(1.117) REF.
28.37
(.105) MAX.
2.66
(.022) DIA. REF.
0.55
Switch Type
Contact Form
Materials
A (SPST-NO)
Body: Glass
Leads: Tin-plated Ni-Fe wire
(.685) MIN.
17.39
(.775) MAX.
19.69
(2.235) NOM.
56.77
Note: SPST-NO = Single-pole, single-throw, normally open
Electrical Ratings
Contact Rating
Voltage
3
1
W/VA - max.
Switching
2
10
1000
265
2000
0.50
0.35
1.30
0.100
10
12
0.2
-75 to +125
-75 to +125
Breakdown
4
Switching
2
Current
3
Carry
Resistance
Capacitance
Temperature
Contact, Initial
Insulation
Contact
Operating
Storage
5
Vdc - max.
Vac - max.
Vdc - min.
Adc - max.
Aac - max.
Adc - max.
Ω - max.
Ω - min.
pF - typ.
°C
°C
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.
© 2017 Littelfuse
Revised: 12/18/17
Specifications are subject to change without notice.
littelfuse.com
Axial Lead Reed Switches
High Voltage > MVSR-20
MVSR-20 19.7mm Reed Switch
Product Characteristics
Operating Characteristics
Operate Time
Release Time
Shock
2
2
1
1
0.75ms - max.
0.30ms - max.
11ms 1∕2 sine wave
50-2000 Hertz
100G - max.
30G - max.
3.2kHz - typ.
Vibration
Resonant Frequency
Magnetic Characteristics
Pull-In Range
3
Ampere Turns
4
17-38
35
L4989
Rating Sensitivity
Test Coil
Ampere Turns
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.
Drop-Out vs. Pull-In Chart
30
Max.
Part Numbering System
MVSR-20-22-28
25
Drop-Out (AT, L4989 Coil)
20
Min.
Series
AT Range
17-23 AT
17-28 AT
22-28 AT
22-33 AT
27-33 AT
27-38 AT
32-38 AT
40
15
10
Example:
22-28 AT product is
MVSR-20-22-28
5
0
0
5
10
15
20
25
30
35
Pull-In (AT, L4989 Coil)
Note: These AT values are the before-modification values of the bare reed switch.
Note: Chart represents the range of Drop Out, min to max for a given Pull-In value.
© 2017 Littelfuse
Revised: 12/18/17
Specifications are subject to change without notice.
littelfuse.com
Surface Mount Reed Switches
Low Power > MASM-14
Packaging
Packaging Option
Bulk
Packaging Specification
Bulk
Quantity
1000
Quantity & Packaging Code
N/A
Taping Width
N/A
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 not designed for, and may not be used in, all applications. Read complete
Disclaimer Notice at
www.littelfuse.com/disclaimier-electronics.
© 2017 Littelfuse
Revised: 12/18/17
Specifications are subject to change without notice.
littelfuse.com
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