Reed Sensor Datasheet
59025 Reed Sensor
Description
The 59025 Reed Sensor is a small cylindrical reed sensor, 25.4
mm (L) x 6.22 mm (Dia.) (1.00” x 0.245”), with a choice of
normally open, normally closed or change-over contacts. It is
capable of switching up to 265 Vac/300 Vdc at 10 VA. The 59025
Reed Sensor is available with a range of sensitivity and cable
length options. It is well suited for use in a wide range of industrial,
appliances, or IoT proximity sensing applications.
It functions best with the 57025 actuator.
Features & Benefits
■ Non-contact switching
solution for wet &
harsh environments
■ No leakage current in ‘open’
state−ideal for batterypowered IoT applications
Additional Information
Resources
Accessories
Samples
■ Available in select sensitivities
(operating distances)
■ Helps implement efficient
proximity/access and energy
management systems
■ Standard cable
configurations; customization
options available
■ Compact size and easy
installation and effective
concealment in
many applications
■ UL Recognized per UL 508
and CSA C22.2 No. 14.
■ Hermetically sealed, IP67
rated; UL and
REACH compliant
Agency Approvals
Agency
■ Can operate through
non-ferrous materials (for
example, wood, plastic,
or aluminum)
Applications
Agency File Number
E61760
Note: Contact Littelfuse for specific agency approval ratings.
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■ Security and access control
■ Major appliances
■ Factory automation
■ Small appliances
■ Process equipment
■ Proximity and limit sensing
© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 10/05/21
Reed Sensor Datasheet
59025 Reed Sensor
Package Dimensions
Material Specifications
Dimensions in mm (inch)
Product
57025 Actuator
59025 Sensor
A Nom. mm[in]
B Nom. mm[in]
Product
Housing
Material
Color
Sealing
Component
6.22
[0.245
6.22
[0.245
25.4 +/- 0.25
[1.00 +/- 0.010]
25.4 +/- 0.25
[1.00 +/- 0.010]
57025 Actuator
30% GF P.B.T
Black
Epoxy
59025 Sensor
30% GF P.B.T
Black
Epoxy
+/+/+/+/-
0.25
0.010]
0.25
0.010]
A
A
B
Electrical Ratings
Switch Type
-
-
1
Normally Open
HighVoltage
2
Contact Rating1
-
VA/Watt - max.
10
10
5
5
Switching2
Vdc - max.
Vac - max.
Vdc - min.
200
140
250
300
265
400
175
120
200
175
120
200
Carry
Adc - max.
Aac - max.
Adc - max.
0.5
0.35
1.2
0.4
0.30
1.4
0.25
0.18
1.5
0.25
0.18
1.5
Capacitance
Contact, Initial
Insulation
Contact
Ω - max.
Ω - min.
pF - typ.
0.2
1010
0.3
0.2
1010
0.2
0.2
109
0.3
0.2
109
0.3
Temperature
Operating
°C
-40 to +105
-20 to +105
-40 to +105
-40 to +105
Contact Type
Voltage4
Breakdown3
Switching2
Current4
Resistance
5
Normally Open
Change Over
Normally Closed
3
4
Product Characteristics
Operate Time
6
-
ms - max.
1.0
1.0
3.0
3.0
Release Time6
-
ms - max.
1.0
1.0
3.0
3.0
Shock7
11ms 1⁄2 sine
G - max.
100
100
50
50
Vibration7
50-2000 Hz
G - max.
30
30
30
30
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. Breakdown Voltage - per MIL-STD-202, Method 301. Leakage current is less than 0.1 mA for 60 seconds.
4. Electrical Load Life Expectancy - Contact Littelfuse with voltage, current values along with type of load.
5. This resistance value is for 300 mm wire length. Resistance changes when wire lengthens.
6. Operate (including bounce)/Release Time - per EIA/NARM RS-421-A, diode suppressed coil (Coil II).
7. Shock and Vibration - per EIA/NARM RS-421-A and MIL-STD-202.
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© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 10/05/21
Reed Sensor Datasheet
59025 Reed Sensor
Sensitivity Options
Select Option
S
T
Pull-In
AT
Range
1 Normally Open
12-18
5-14
6-16
17-23
4-11
6-15
22-28
1-8
4-13
27-33
0.5-7
3-13
--
--
--
17-23
3-9
5-12
22-28
2-9
4-13
27-33
0.5-7
3-13
High Voltage
3
Change Over
4 Normally Closed
Pull-In
AT
Range
Activation Deactivation
Distance
Distance
(mm)
(mm)
Pull-In
AT
Range
V
Switch Type
2
Activation Deactivation
Distance
Distance
(mm)
(mm)
U
Activation Deactivation
Distance
Distance
(mm)
(mm)
Pull-In
AT
Range
Activation Deactivation
Distance
Distance
(mm)
(mm)
15-20
3-11
5-16
20-25
3-10
4-13
25-30
2-9
4-13
27-33
--
--
15-20
4-11
5-16
20-25
3-9
4-11
25-30
2-8
4-10
27-33
--
--
Note:
1. Measurments are from 57025 Nominal Actuator
2. Pull-In AT Range: These AT values are the bare reed switch AT before modification.
3. Not recommended to be mounted within/near ferrous materials; if doing so these activate & deactivate
distances will decrease significantly
Schematics
Sensor
Actuator
Switch Type
Black
1, 2
Black
Black
Blue
White
3
Black
Cable Length Specification
Termination Specification
Cable Type: 24 AWG 7/32 PVC 105°C UL1430/UL1569
Options
Termination Options
Cable Length mm [inch]
02
300 +/- 10.00 [11.81 +/- 0.394]
05
1000 +/- 10.00 [39.37 +/- 0.394]
Select Option
A
Packaging Specification
Description (Two-wire versions illustrated)
Tinned leads (6.4±0.76) mm
Packaging
Cable Length
4
Black
D
Part Numbering System
59025 - X - X - XX - X
Quantity
02
Bulk
2000
05
Bulk
1500
Sensor
Package Markings
Series
Switch Type
1, 2, 3, or 4
Sensitivity
S, T, U, or V
Cable Length
02, 05
Termination
A
LITTELFUSE
59025-X-X-XX-X
YYWW
Part Number
Date Code
YYWW
Actuator
57025 - 000
Series
Standard Actuator
000
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 http://www.littelfuse.com/disclaimer-electronics.
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© 2021 Littelfuse, Inc.
Specifications are subject to change without notice.
Revised: GD. 10/05/21
