59251-1-S-02-B [LITTELFUSE]
Reed Sensors;
LITTELFUSE 
Reed Sensors
Push Button Sensor > 59251
59251 Seating Occupancy Reed Switch Sensor
Description
The 59251 is a magnetically operated push button sensor with simple push fit
clip mounting. It has a large integral dome and it’s normally open contacts
actuate when the dome is depressed. It can switch up to 140Vac/200Vdc at
10W. The 59251 has a large integral dome for load distribution and neoprene
boot for environmental protection. It has choice of various cable lengths and
connector options.
Features
• Magnetically operated
position sensor
• Simple push fit mounting
• Operates when plunger is
depressed
• Choice of cable length
• Choice of connector
• Large integral dome
Dimensions
Dimensions in mm (inch)
Benefits
• Robust construction makes this
sensor well suited to harsh
environments
• Integral neoprene boot provides
protection from severe
environments
• No standby power required
• Hermetically sealed, magnetically
operated contacts give excellent
life and reliabilty
88.90 108.20
(3.500) (4.260)
Ø66.0
(2.600)
Ø8.13
(.320)
Applications
• Seat occupancy sensing
• Position and limit sensing
2.75
(69.85)
Activation (without boot)
24.38
(.960)
10.00
Cable Length Option (.390)
Operate Distance d1 5.5mm (.217) max.
Release Distance d2 1.5mm (.059) min.
6.35
(.250)
23.88
(.940)
Release
Operate
16.00
(.630)
d1
d2
Rest Position
17.27
(.680)
© 2015 Littelfuse
Revised: 11/02/15
littelfuse.com
Specifications are subject to change without notice.
Reed Sensors
Push Button Sensor > 59251
59251 Seating Occupancy Reed Switch Sensor
Electrical Ratings
Contact Type
Normally
Open
Switch Type
1
Contact Rating 1
VA/Watt - max.
10
Switching 2
Vdc - max.
Vac - max.
Vdc - min.
200
140
250
Voltage 4
Breakdown 3
Switching 2
Adc - max.
Aac - max.
Adc - max.
0.5
0.35
0.5
Current 4
Carry
Contact, Initial
Insulation
Ω - max.
Ω - min.
0.2
Resistance 5
1010
Capacitance
Temperature
Contact
pF - typ.
°C
0.2
Operating
-40 to +85
Product Characteristics
Operate Time 6
Release Time 6
Shock 7
ms - max.
ms - max.
G - max.
G - max.
1.0
1.0
100
30
11ms ꢀ sine
50-2000 Hz
Vibration 7
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.
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.
© 2015 Littelfuse
Revised: 11/02/15
littelfuse.com
Specifications are subject to change without notice.
Reed Sensors
Push Button Sensor > 59251
59251 Seating Occupancy Reed Switch Sensor
Cable Length Specification
Part Numbering System
Cable Type: 18 AWG 19/30 XLP Polyethylene
59251 - 1 - S - XX - X
Cable Length
mm (inch)
Select Option
02
300 (11.81)
Series
Termination Specification
SwitchType
Termination Options
Sensitivity
Select
Option
Description
(Two-wire versions illustrated)
Cable Length
02
A
F
Tinned leads (6.4 0.76)mm
Termination
Untinned leads (6.4 0.76)mm
Deutsch DTM04-2P
A, B, or F
B
Packaging
Packaging Option
Packaging Specification
Quantity
Quantity & Packaging Code
Taping Width
Bulk
Bulk
500
N/A
N/A
© 2015 Littelfuse
Revised: 11/02/15
littelfuse.com
Specifications are subject to change without notice.
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