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Reed Sensors
B C
Firecracker > 59025
59025 Firecracker Reed Sensor + 57025 Actuator
Description
The 59025 Firecracker Reed Sensor is a small cylindrical reed sensor, 25.4mm (L)
x 6.22mm (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 265Vac/300Vdc
at 10VA. The 59025 Firecracker Reed Sensor is available with a range of
sensitivity and cable length options. It functions best with the 57025 actuator.
Note: The 57025 Actuator is sold separately.
Features
• Magnetically-operated proximity
sensor
• Hermetically sealed contacts
• Operates through non-ferrous
materials such as wood, plastic
Agency Approvals
or aluminum
• Customer-defined sensitivity option
• Custom cable length and connector
options available
• RoHS compliant
Agency Agency File Number
E61760
Note: Contact Littelfuse for specific agency approval ratings.
Dimensions
Dimensions in mm (inch)
A
A
57025 Actuator
59025 Sensor
A
Nom.
6.22 (.245) 25.40 (1.000) --
6.22 (.245 25.40 (1.000)
B
Nom.
C
Nom.
Cable Length ±
10.00 (.393)
Benefits
• Fits nicely into small confined
spaces
• Quick and easy to install
• Well suited for usage in highmoisture and contaminated
environments
• Non-contact solution, aesthetically
more appealing than push-button or
lever mechanical-type switches
Applications
• Position and limit sensing
• Security
• Ideal for battery-powered
applications as the contacts do not
draw power when in the nonactivated state
• Reed contacts last for millions of
operating cycles under microcontroller logic level loads
• Level sensing
• Linear actuators
Specifications are subject to change without notice.
littelfuse.com© 2019 Littelfuse Revised: 02/08/19
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Reed Sensors
Black
Black
Black
White
Black
Black
Firecracker > 59025
59025 Firecracker Reed Sensor + 57025 Actuator
Electrical Ratings
Contact Type Normally Open
Switch Type 1 2 3 4
Contact Rating
4
Voltage
4
Current
Resistance
1
Switching
Breakdown
Switching
Carry
5
Contact, Initial
Insulation
VA/Watt - max. 10 10 5 5
2
3
2
Vdc - max.
Vac - max.
Vdc - min.
Adc - max.
Aac - max.
Adc - max.
Ω - max.
Ω - min.
200
140
250
0.5
0.35
1.2
0.2
10
10
Capacitance Contact pF - typ. 0.3 0.2 0.3 0.3
Temperature Operating °C -40 to +105 -20 to +105 -40 to +105 -40 to +105
Normally Open
HighVoltage
300
265
400
0.4
0.30
1.4
0.2
10
10
Change Over Normally Closed
175
120
200
0.25
0.18
1.5
0.2
9
10
175
120
200
0.25
0.18
1.5
0.2
10
9
Product Characteristics
Operate Time
Release Time
Shock
Vibration
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 0.1mA 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 11.81mm 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.
8. For custom modifications to the wire length or size, or adding a special connector, please contact Littelfuse.
9. Custom sensitivities and a high voltage switch are options
6
6
7
7
11ms ½ sine G - max. 100 100 50 50
50-2000 Hz G - max. 30 30 30 30
ms - max. 1.0 1.0 3.0 3.0
ms - max. 1.0 1.0 3.0 3.0
Sensitivity Options (Using 57025 Actuator)
Select Option S T U V
Activate Distance−D
Switch Type
Pull-In
AT Range
mm (inch)
Average
AT Range
1 Normally Open 12-18 7.9 (.311) 17-23 6.2 (.244) 22-28 4.9 (.193) 27-33 4.2 (.165)
2 High Voltage -- -- 17-23 6.2 (.244) 22-28 4.9 (.193) 27-33 4.2 (.165)
3 Change Over 15-20 7.2 (.283) 20-25 5.7 (.224) 25-30 4.7 (.185) -- -4 Normally Closed 15-20 7.2 (.283) 20-25 5.7 (.224) 25-30 4.7 (.185) -- --
Note:
1. Pull-In AT Range: These AT values are the bare reed switch AT before modification.
2. The activation distance is average value on the final sensor assembly.
Activate Distance−D
Pull-In
mm (inch)
Average
Pull-In
AT Range
Activate Distance−D
mm (inch)
Average
Pull-In
AT Range
Schematics Switch Type
Activate Distance−D
mm (inch)
Average
Sensor Actuator
Specifications are subject to change without notice.
1
Blue
3
D
4
littelfuse.com© 2019 Littelfuse Revised: 02/08/19
Page 3
Reed Sensors
Firecracker > 59025
59025 Firecracker Reed Sensor + 57025 Actuator
Cable Length Specification
Cable Type: 24 AWG 7/32 PVC 105°C UL1430/UL1569
Select Option
02 300 (11.81)
Cable Length
mm (inch)
Termination Specification
Termination Options
Select
Option
A Tinned leads (6.4±0.76)mm
F Untinned leads (6.4±0.76)mm
E JST type XHP 2.5mm pitch
(Two-wire versions illustrated)
Description
Part Numbering System
Sensor:
Series
Switch Type
1, 2, 3, or 4
Sensitivity
S, T, U or V
Cable Length
Termination
A, F, or E
Actuator:
Series
59025 - X - X - XX - X
02
57025 - 000
Standard Actuator
000
Note: The 57025 Actuator is sold separately.
Packaging
Packaging Option Packaging Specification Quantity Quantity & Packaging Code Taping Width
Bulk Bulk 500 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 http://www.littelfuse.com/disclaimer-electronics.
Specifications are subject to change without notice.
littelfuse.com© 2019 Littelfuse Revised: 02/08/19
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