littelfuse.com© 2017 Littelfuse Revised: 07/18/17
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
Pending 17-38 AT
Pending 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
(2.235)NOM.
(.775) MAX.
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
1
W/VA - max. 10
Voltage
3
Switching
2
Breakdown
4
Vdc - max.
Vdc - min.
1000
2000
Current
3
Switching
2
Carry
Adc - max.
Adc - max.
0.50
1.30
Resistance
Contact, Initial
Insulation
Ω - max.
Ω - min.
0.100
10
12
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.
