MVSR-20 Series Datasheet by Littelfuse Inc.

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littelfuse.com© 2018 Littelfuse Revised: 12/18/18
Specifications are subject to change without notice.
MVSR-20 19.7mm Reed Switch
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.
Agency Approvals
Agency Agency File Number Ampere-Turns Range
E47258
E471070 17-38 AT
DEMKO 14 ATEX 1393U 17-38 AT
Switch Type
Contact Form A (SPST-NO)
Materials Body: Glass
Leads: Tin-plated Ni-Fe wire
Axial Lead Reed Switches
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
• 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)
High Voltage > MVSR-20
RoHS
Note: SPST-NO = Single-pole, single-throw, normally open
CL OF OVERLAP
(2.235)NOM.
(.775) MAX.
56.77
19.69
17.39
(.685)MIN.
(1.1 17)REF.
28.37
(.105)MAX. (.022)DIA.REF
.
0.55
2.66
Electrical Ratings
Contact Rating 1W/VA - max. 10
Voltage 3
Switching 2
Breakdown 4
Vdc - max.
Vac - max.
Vdc - min.
1000
265
2000
Current 3
Switching 2
Carry
Adc - max.
Aac - max.
Adc - max.
0.50
0.35
1.30
Resistance Contact, Initial
Insulation
Ω - max.
Ω - min.
0.100
1012
Capacitance Contact pF - typ. 0.2
Temperature Operating
Storage 5
°C
°C
-75 to +125
-75 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.
Note: Contact Littelfuse for specific agency approval ratings.
mm 0.» ma an \ \\ \ MVSR-20-22-28
littelfuse.com© 2018 Littelfuse Revised: 12/18/18
Specifications are subject to change without notice.
Magnetic Characteristics
Pull-In Range 3Ampere Turns 17-38
Rating Sensitivity 4Ampere Turns 35
Test Coil L4989
Drop-Out vs. Pull-In Chart
Product Characteristics
Operating Characteristics
Operate Time 10.75ms - max.
Release Time 10.30ms - max.
Shock 211ms 1∕2 sine wave 100G - max.
Vibration 250-2000 Hertz 30G - max.
Resonant Frequency 3.2kHz - 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 Voltage > MVSR-20
MVSR-20 19.7mm Reed Switch
MVSR-20-22-28
Series
AT Range
17-23 AT
17-28 AT
22-28 AT
22-33 AT
27-33 AT
27-38 AT
32-38 AT
Example:
22-28 AT product is
MVSR-20-22-28
Note: Chart represents the range of Drop Out, min to max for a given Pull-In value.
5
0
10
15
20
25
30
50
Pull-In (AT, L4989 Coil)
Drop-Out (AT, L4989 Coil)
10 15 20 25 30 35
40
Max.
Min.
Note: These AT values are the before-modification values of the bare reed switch.
Packaging
Packaging Option Packaging Specification Quantity Quantity & Packaging Code Taping Width
Bulk Bulk 1000 N/A 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.