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Sensors Portfolio

Littelfuse is a global leader in magnetic sensing solutions with a portfolio covering reed switches, reed sensors, hall effect sensors, reed relays, and magnetic actuators. Littelfuse also offers a broad range of thermistors, resistance temperature detectors (RTDs), digital temperature indicators, and probes and assemblies for temperature sensing applications.

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Part #

Magnetic / Reed Switches 175V 5WATTS

MDRR-DT-30-35-F
Littelfuse
1: $7.95
1,982On Order

Mfr. Part #
MDRR-DT-30-35-F

Mouser Part #
934-MDRR-DT-30-35-F

Magnetic / Reed Switches 175V 5WATTS

Datasheet

1,982On Order

$7.95

$6.73

$6.26

$5.64

View

Min.: 1
Mult.: 1

Magnetic / Reed Switches CO 10-15AT SMT

MDSM-DTB-10-15
Littelfuse
1: $9.07
915Expected 2026-05-08

Mfr. Part #
MDSM-DTB-10-15

Mouser Part #
934-MDSM-DTB-10-15

Magnetic / Reed Switches CO 10-15AT SMT

Datasheet

915Expected 2026-05-08

$9.07

$7.91

$7.49

$6.84

View

Min.: 1
Mult.: 1

Reed Relays HE3321C2400 RELAY

HE3321C2400
Littelfuse
1: $1.38
4,331In Stock
Factory Special Order

Mfr. Part #
HE3321C2400

Mouser Part #
934-HE3321C2400

Factory Special Order

Reed Relays HE3321C2400 RELAY

Datasheet

4,331In Stock

$1.38

$1.22

$1.17

$1.13

View

Min.: 1
Mult.: 1

Reed Relays REED RELAY

HE3621A0510
Littelfuse
Restricted Availability
Factory Special Order

Mfr. Part #
HE3621A0510

Mouser Part #
934-HE3621A0510

Factory Special Order

Reed Relays REED RELAY

Datasheet

More Info Available

Restricted Availability

Reed Relays HE721C2410 REED RELAY

HE721C2410
Littelfuse
Restricted Availability
Factory Special Order

Mfr. Part #
HE721C2410

Mouser Part #
934-HE721C2410

Factory Special Order

Reed Relays HE721C2410 REED RELAY

Datasheet

More Info Available

Restricted Availability

Sensor Hardware & Accessories HARDWARE ACTUATOR MAGNET

57125-000
Littelfuse
1: $2.85
616Expected 2026-06-03

Mfr. Part #
57125-000

Mouser Part #
934-57125-000

Sensor Hardware & Accessories HARDWARE ACTUATOR MAGNET

Datasheet

616Expected 2026-06-03

$2.85

$2.56

$2.45

$2.36

View

Min.: 1
Mult.: 1

Proximity Sensors 59025 020 PROX SENSOR

59025-020
Littelfuse
1: $3.64
489Expected 2026-05-13

Mfr. Part #
59025-020

Mouser Part #
934-59025-020

Proximity Sensors 59025 020 PROX SENSOR

489Expected 2026-05-13

$3.64

$2.85

$2.48

$2.29

View

Min.: 1
Mult.: 1

Proximity Sensors NO 17-23AT 1m TIN 59025 Firecracker

59025-1-T-05-A
Littelfuse
1: $1.69
700Expected 2026-06-04

Mfr. Part #
59025-1-T-05-A

Mouser Part #
934-59025-1-T-05-A

Proximity Sensors NO 17-23AT 1m TIN 59025 Firecracker

Datasheet

700Expected 2026-06-04

$1.69

$1.33

$1.19

$1.14

View

Min.: 1
Mult.: 1

Proximity Sensors NO 22-28AT 1m TIN 59025 Firecracker

59025-1-U-05-A
Littelfuse
1: $4.28
500Expected 2026-05-19

Mfr. Part #
59025-1-U-05-A

Mouser Part #
934-59025-1-U-05-A

Proximity Sensors NO 22-28AT 1m TIN 59025 Firecracker

Datasheet

500Expected 2026-05-19

$4.28

$3.88

$3.72

$3.57

View

Min.: 1
Mult.: 1

Magnetic / Reed Switches 59170-1-T-00-A SENS

59170-1-T-00-A
Littelfuse
1: $3.49
722Expected 2026-03-31

Mfr. Part #
59170-1-T-00-A

Mouser Part #
934-59170-1-T-00-A

Magnetic / Reed Switches 59170-1-T-00-A SENS

Datasheet

722Expected 2026-03-31

$3.49

$2.93

$2.73

$2.42

View

Min.: 1
Mult.: 1

Magnetic / Reed Switches MLRR-4 17-28

MLRR-4-17-28
Littelfuse
1: $1.97
828Expected 2026-02-23

Mfr. Part #
MLRR-4-17-28

Mouser Part #
934-MLRR-417-28

Magnetic / Reed Switches MLRR-4 17-28

Datasheet

828Expected 2026-02-23

$1.97

$1.67

$1.57

$1.39

View

Min.: 1
Mult.: 1

Reed Relays REED RELAY

HE3621A1200
Littelfuse
Restricted Availability
Factory Special Order

Mfr. Part #
HE3621A1200

Mouser Part #
934-HE3621A1200

Factory Special Order

Reed Relays REED RELAY

Datasheet

More Info Available

Restricted Availability

Reed Relays REED RELAY

HE721C0500
Littelfuse
Restricted Availability
Factory Special Order

Mfr. Part #
HE721C0500

Mouser Part #
934-HE721C0500

Factory Special Order

Reed Relays REED RELAY

Datasheet

More Info Available

Restricted Availability

Board Mount Temperature Sensors 6 OHM 600MW-HD 100A PTC

RF4819-000
Littelfuse
20,000: $0.423
Non-Stocked Lead-Time 11 Weeks

Mfr. Part #
RF4819-000

Mouser Part #
576-RF4819-000

Board Mount Temperature Sensors 6 OHM 600MW-HD 100A PTC

Datasheet

Non-Stocked Lead-Time 11 Weeks

Cut Tape

$0.423

Min.: 20,000
Mult.: 4,000

Reel: 4,000

Magnetic / Reed Switches MDSM-10B 5430 10-25

MDSM-10B-10-25
Littelfuse
1,000: $1.28
Non-Stocked Lead-Time 11 Weeks

Mfr. Part #
MDSM-10B-10-25

Mouser Part #
934-MDSM-10B10-25

Magnetic / Reed Switches MDSM-10B 5430 10-25

Datasheet

Non-Stocked Lead-Time 11 Weeks

$1.28

$1.20

$1.14

Min.: 1,000
Mult.: 100

Magnetic / Reed Switches MDSM-10B 5430 15-20

MDSM-10B-15-20
Littelfuse
1,000: $1.27
Non-Stocked Lead-Time 11 Weeks

Mfr. Part #
MDSM-10B-15-20

Mouser Part #
934-MDSM-10B15-20

Magnetic / Reed Switches MDSM-10B 5430 15-20

Datasheet

Non-Stocked Lead-Time 11 Weeks

$1.27

$1.17

$1.13

Min.: 1,000
Mult.: 100

Magnetic / Reed Switches MDSM-10B 5430 20-25

MDSM-10B-20-25
Littelfuse
1,000: $1.28
Non-Stocked Lead-Time 11 Weeks

Mfr. Part #
MDSM-10B-20-25

Mouser Part #
934-MDSM-10B20-25

Magnetic / Reed Switches MDSM-10B 5430 20-25

Datasheet

Non-Stocked Lead-Time 11 Weeks

$1.28

$1.20

$1.14

Min.: 1,000
Mult.: 100

Magnetic / Reed Switches MDSM-4B 5276 17-23

MDSM-4B-17-23
Littelfuse
1,000: $1.17
Non-Stocked Lead-Time 11 Weeks

Mfr. Part #
MDSM-4B-17-23

Mouser Part #
934-MDSM-4B17-23

Magnetic / Reed Switches MDSM-4B 5276 17-23

Datasheet

Non-Stocked Lead-Time 11 Weeks

$1.17

$1.10

$1.05

Min.: 1,000
Mult.: 100

Magnetic / Reed Switches MDSM-4B 5276 22-28

MDSM-4B-22-28
Littelfuse
1,000: $1.17
Non-Stocked Lead-Time 11 Weeks

Mfr. Part #
MDSM-4B-22-28

Mouser Part #
934-MDSM-4B22-28

Magnetic / Reed Switches MDSM-4B 5276 22-28

Datasheet

Non-Stocked Lead-Time 11 Weeks

$1.17

$1.07

$1.04

Min.: 1,000
Mult.: 100

Magnetic / Reed Switches MDSM-4B 5276 27-33

MDSM-4B-27-33
Littelfuse
1,000: $1.16
Non-Stocked Lead-Time 11 Weeks

Mfr. Part #
MDSM-4B-27-33

Mouser Part #
934-MDSM-4B27-33

Magnetic / Reed Switches MDSM-4B 5276 27-33

Datasheet

Non-Stocked Lead-Time 11 Weeks

$1.16

$1.07

$1.04

Min.: 1,000
Mult.: 100

Magnetic / Reed Switches MDSM-4R 5277 17-28

MDSM-4R-17-28
Littelfuse
3,000: $1.10
Non-Stocked Lead-Time 11 Weeks

Mfr. Part #
MDSM-4R-17-28

Mouser Part #
934-MDSM-4R17-28

Magnetic / Reed Switches MDSM-4R 5277 17-28

Datasheet

Non-Stocked Lead-Time 11 Weeks

Reel

$1.10

$1.05

Min.: 3,000
Mult.: 3,000

Reel: 3,000

Magnetic / Reed Switches MDSM-4R 5277 22-28

MDSM-4R-22-28
Littelfuse
3,000: $1.09
Non-Stocked Lead-Time 11 Weeks

Mfr. Part #
MDSM-4R-22-28

Mouser Part #
934-MDSM-4R22-28

Magnetic / Reed Switches MDSM-4R 5277 22-28

Datasheet

Non-Stocked Lead-Time 11 Weeks

Reel

$1.09

$1.05

Min.: 3,000
Mult.: 3,000

Reel: 3,000

Magnetic / Reed Switches MDSM-4R 22-33

MDSM-4R-22-33
Littelfuse
3,000: $1.08
Non-Stocked Lead-Time 11 Weeks

Mfr. Part #
MDSM-4R-22-33

Mouser Part #
934-MDSM-4R22-33

Magnetic / Reed Switches MDSM-4R 22-33

Datasheet

Non-Stocked Lead-Time 11 Weeks

Reel

$1.08

$1.05

Min.: 3,000
Mult.: 3,000

Reel: 3,000

Magnetic / Reed Switches MDSM-4R 5277 27-33

MDSM-4R-27-33
Littelfuse
3,000: $1.10
Non-Stocked Lead-Time 11 Weeks

Mfr. Part #
MDSM-4R-27-33

Mouser Part #
934-MDSM-4R27-33

Magnetic / Reed Switches MDSM-4R 5277 27-33

Datasheet

Non-Stocked Lead-Time 11 Weeks

Reel

$1.10

$1.05

Min.: 3,000
Mult.: 3,000

Reel: 3,000

Magnetic / Reed Switches SWITCH REED

MDSM-4R-32-38
Littelfuse
3,000: $1.15
Non-Stocked Lead-Time 12 Weeks

Mfr. Part #
MDSM-4R-32-38

Mouser Part #
934-MDSM-4R32-38

Magnetic / Reed Switches SWITCH REED

Datasheet

Non-Stocked Lead-Time 12 Weeks

Reel

$1.15

Min.: 3,000
Mult.: 3,000

Reel: 3,000