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
Benefits
Agency Approvals
Agency
Agency File Number
Pending
Pending
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
IN
Applications
Switch Type
Contact Form
Materials
2
• Reed relays (particularly suitable
for high voltage breakdown
applications)
• Security
Dimensions in mm (inch)
CL OF OVERLAP
(1.117) REF.
28.37
IM
(.105) MAX.
2.66
(.022) DIA. REF.
0.55
Dimensions
Note: SPST-NO = Single-pole, single-throw, normally open
Electrical Ratings
Contact Rating
Voltage
Current
3
1
EL
(2.235) NOM.
56.77
(.685) MIN.
17.39
(.775) MAX.
19.69
PR
Switching
2
Breakdown
4
Switching
Carry
3
Resistance
Contact, Initial
Insulation
Contact
Operating
Storage
5
Capacitance
Temperature
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: 07/18/17
Specifications are subject to change without notice.
littelfuse.com
A
RY
• Zero operating power required
for contact closure
• Limit switching
• Telecoms line switching
• Industrial equipment
A (SPST-NO)
Body: Glass
Leads: Tin-plated Ni-Fe wire
W/VA - max.
Vdc - max.
Vdc - min.
Adc - max.
Adc - max.
Ω - max.
Ω - min.
pF - typ.
°C
°C
10
1000
2000
0.50
1.30
0.100
10
12
0.2
-75 to +125
-75 to +125
• Minimum voltage breakdown
2000 Vdc
• Available sensitivity range 17-38 AT
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.
Vibration
Resonant Frequency
Magnetic Characteristics
Pull-In Range
3
Ampere Turns
4
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
IM
Max.
Min.
IN
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
Part Numbering System
25
Drop-Out (AT, L4989 Coil)
20
15
10
5
0
0
EL
5
10
15
20
25
30
Pull-In (AT, L4989 Coil)
35
Note: These AT values are the before-modification values of the bare reed switch.
PR
Note: Chart represents the range of Drop Out, min to max for a given Pull-In value.
Packaging
Packaging Option
Bulk
Packaging Specification
Bulk
Quantity
1000
Quantity & Packaging Code
N/A
A
© 2017 Littelfuse
Revised: 07/18/17
Specifications are subject to change without notice.
RY
30G - max.
3.2kHz - typ.
17-38
35
L4989
MVSR-20-22-28
Example:
22-28 AT product is
MVSR-20-22-28
Taping Width
N/A
littelfuse.com
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