Reed Sensors
Firecracker > 59040
59040 Press-Fit Firecracker Reed Sensor + 57040 Actuator
Description
Sensor
The 59040 Press-Fit Firecracker Reed Sensor is a small, cylindrical reed sensor
31.0mm (1.22”) long that presses into a 9.5mm (.375”) diameter hole with a
choice of normally open, normally closed or change-over contacts. It is capable
of switching up to 200Vdc at 10W and is available with a range of sensitivity,
cable length, plastic housing color (white, black, and wooden brown), and
connector options. It has three crush ribs along the length of the capsule that
allow a firm and fixed press-fit. It is well suited for position and limit sensing,
security, level sensing applications. It functions best with the 57040 actuator.
Note: The 57040 Actuator is sold separately.
Actuator
Features
• Magnetically-operated press-fit
proximity sensor
• Cylindrical capsule with retaining
ribs
• Operates and mounts through non-
ferrous materials such as wood,
plastic or aluminum
• Hermetically sealed contacts
• Customer-defined sensitivity
options available
• Custom cable length and connector
options available
• Press-fits into a standard drill size
hole of 9.5mm (.375”) diameter
Agency Approvals
Agency
Agency File Number
E61760
Note: Contact Littelfuse for specific agency approval ratings.
Benefits
• Ribs on capsule compress when
inserted into a mounting hole and
provide retaining force, allowing
simple and secure press-fit
installation
• Quick and easy press-fit installation
that requires no screws, brackets,
nor glue.
• Well suited for usage in high-
moisture and contaminated
environments
300
(11.81)
Dimensions
Dimensions in mm (inch)
Sensor
8.46±0.25
(.333±.01)
• Non-contact solution, aesthetically
more appealing than push-button or
lever mechanical-type switches
• Ideal for battery-powered
applications as the contacts do not
draw power when in the non-
activated state
• Reed contacts last for millions of
operating cycles under micro-
controller voltage and current logic-
level loads
10.70 ±0.25
(.42 ±.01)
31.00±0.25
(1.22±.01)
Applications
• Position and limit sensing
• Security
• Appliances
• Industrial
Actuator
8.46±0.25
(.333±.01)
10.70 ±0.25
(.42 ±.01)
31.00±0.25
(1.22±.01)
Notes:
1. The 59040 Sensor and 57040 Actuator are designed to fit into a drill size hole of 9.5mm
(0.375") diameter.
2. Not recommended to be mounted within ferrous metal materials. The activate distance
will decrease significantly.
© 2016 Littelfuse
Revised: 03/02/16
Specifications are subject to change without notice.
littelfuse.com
Reed Sensors
Firecracker > 59040
59040 Press-Fit Firecracker Reed Sensor + 57040 Actuator
Electrical Ratings
Contact Type
Switch Type
Contact Rating
Voltage
4
1
Normally Open
1
VA/Watt - max.
Switching
2
Change Over
3
5
175
120
200
0.25
0.18
1.5
0.2
10
9
1.0
-40 to +105
Normally Closed
4
5
175
120
200
0.25
0.18
1.5
0.2
10
9
1.0
-40 to +105
10
200
140
250
0.5
0.35
1.2
0.2
10
10
0.3
-40 to +105
Breakdown
4
3
Vdc - max.
Vac - max.
Vdc - min.
Adc - max.
Aac - max.
Adc - max.
Ω - max.
Ω - min.
pF - typ.
°C
Current
Switching
Carry
5
2
Resistance
Contact, Initial
Insulation
Contact
Operating
Capacitance
Temperature
Product Characteristics
Operate Time
Release Time
Shock
7
7
6
6
ms - max.
ms - max.
11ms 1⁄2 sine
50-2000 Hz
G - max.
G - max.
1.0
1.0
100
30
3.0
3.0
50
30
3.0
3.0
50
30
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 11.81in 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, adding a special connector, or plastic housing color options, please contact Littelfuse.
9. Custom sensitivity options and a normally open high-voltage switch option are available.
Sensitivity Options (Using 57040 Actuator)
Select Option
Switch Type
Pull-In
AT Range
S
Activate Distance, D
mm (inch)
Average
Pull-In
AT Range
T
Activate Distance, D
mm (inch)
Average
Pull-In
AT Range
U
Activate Distance, D
mm (inch)
Average
1
3
4
Normally Open
Change Over
Normally Closed
12-18
15-20
15-20
25.0 (.984)
21.0 (.836)
21.0 (.836)
17-23
20-25
20-25
21.2 (.834)
18.4 (.725)
18.4 (.725)
22-28
25-30
25-30
17.9 (.705)
17.0 (.670)
17.0 (.670)
Note:
1. Pull-In AT Range: These AT values are the bare reed switch AT before modification.
2. The activate distance is an average value for the final sensor assembly.
3. Not recommended to be mounted within/near ferrous metal materials; if doing so, these
activate distances will decrease significantly.
Schematics
Black
Black
Black
Blue
White
Black
Switch Type
1
3
4
Actuator
Sensor
D
© 2016 Littelfuse
Revised: 03/02/16
Specifications are subject to change without notice.
Black
littelfuse.com
Firecracker > 59040
Reed Sensors
59040 Press-Fit Firecracker Reed Sensor + 57040 Actuator
Cable Length Specification
Cable Type: 24 AWG PVC 105°C UL1430/UL1569
Select Option
02
Cable Length
mm (inch)
300 (11.81)
Termination Specification
Termination Options
Select
Option
A
F
E
Description
(Two-wire versions illustrated)
Tinned leads (6.4±0.76)mm
Untinned leads (6.4±0.76)mm
JST type XHP 2.5mm pitch
Part Numbering System
Sensor:
59040 - X - X - XX - X
Actuator:
57040 - 000
Series
Switch Type
1, 3, or 4
Sensitivity
S, T, or U
Cable Length
02
Termination
A, F or E
,
Series
Standard Actuator
000
Note: The 57040 Actuator is sold separately.
Product Marking
59040 - X - X - XX - X
XXXX
LITTELFUSE
Part Number
Date Code
(YYWW)
Packaging
Packaging Option
Bulk
Packaging Specification
Bulk
Quantity
500
Quantity and Packaging Code
N/A
Taping Width
N/A
© 2016 Littelfuse
Revised: 03/02/16
Specifications are subject to change without notice.
littelfuse.com
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