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 (L) x 10.7mm (Dia.) (1.22” x 0.420”) with a choice of normally open,
normally closed or change-over contacts. It is capable of switching up to 300Vdc
at 10W and available with a range of sensitivity, cable length and connector
options. It is well suited for position and limit sensing, security, level sensing and
linear actuator applications. It functions best with the 57040 actuator.
Note: The 57040 Actuator is sold separately.
Actuator
Features
• Magnetically-operated proximity
sensor
• Cylindrical capsule with retaining
ribs
• Operates through non-ferrous
materials such as wood, plastic or
aluminum
• Hermetically sealed contacts
• Options of normally open, normally
closed or single-pole-double-throw
• Customer-defined sensitivity
• Custom cable length and connector
options available
Dimensions
Dimensions in mm (inch)
Sensor
8.46±0.25
(.333±.01)
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
• 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)
300
(11.81)
Actuator
8.46±0.25
(.333±.01)
10.70 ±0.25
(.42 ±.01)
31.00±0.25
(1.22±.01)
Applications
• Position and limit sensing
• Security
• Level sensing
• Linear actuators
Notes:
1. The 59040 Sensor and 57040 Actuator are designed to fit into a drill size hole of 9.5mm
(0.374") diameter.
2. Not recommended to be mounted within ferrous metal materials, these activate distance
will decrease significantly.
© 2015 Littelfuse
Revised: 11/02/15
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
1.0
1.5
0.2
10
9
0.3
-40 to +105
Normally Closed
4
5
175
120
200
0.25
1.0
1.5
0.2
10
9
0.3
-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 11.81mm 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 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
T
U
Activate Distance
Activate Distance
Activate Distance
mm (inch)
Pull-In AT Range
mm (inch)
Pull-In AT Range
mm (inch)
Average
Average
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
© 2015 Littelfuse
Revised: 11/02/15
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.
Packaging
Packaging Option
Bulk
Packaging Specification
Bulk
Quantity
500
Quantity and Packaging Code
N/A
Taping Width
N/A
© 2015 Littelfuse
Revised: 11/02/15
Specifications are subject to change without notice.
littelfuse.com
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