littelfuse.com© 2019 Littelfuse Revised: 02/08/19
Specifications are subject to change without notice.
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
• zRoHS compliant
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
Applications
• Seat occupancy sensing
• Position and limit sensing
Activation (without boot)
Dimensions
Dimensions in mm (inch)
Operate Distance d1 5.5mm (0.217) max.
Release
Distance d2 1.5mm (0.059) min.
Rest Position
Release
Operate
d1
d2
88.90
(3.500)
1
08.20
(4.260)
2.75
(69.85)
10.00
Cable Length Option±(.390)
Ø66.0
(2.600)
Ø8.13
(.320)
17.27
(.680)
16.00
(.630)
24.38
(.960)
6.35
(.250)
23.88
(.940)
littelfuse.com© 2019 Littelfuse Revised: 02/08/19
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 1VA/Watt - max. 10
Voltage 4Switching 2
Breakdown 3
Vdc - max.
Vac - max.
Vdc - min.
200
140
250
Current 4Switching 2
Carry
Adc - max.
Aac - max.
Adc - max.
0.5
0.35
0.5
Resistance 5Contact, Initial
Insulation Ω - max.
Ω - min. 0.2
1010
Capacitance Contact pF - typ. 0.2
Temperature Operating °C -40 to +85
Product Characteristics
Operate Time 6ms - max. 1.0
Release Time 6ms - max. 1.0
Shock 711ms ½ sine G - max. 100
Vibration 750-2000 Hz G - max. 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.
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.
littelfuse.com© 2019 Littelfuse Revised: 02/08/19
Specifications are subject to change without notice.
Reed Sensors
Push Button Sensor > 59251
Packaging
Packaging Option Packaging Specification Quantity Quantity & Packaging Code Taping Width
Bulk Bulk 500 N/A N/A
Part Numbering System
59251 - 1 - S - XX - X
Series
Switch Type
Sensitivity
Termination
A, B, or F
Cable Length
02
59251 Seating Occupancy Reed Switch Sensor
Cable Length Specification
Cable Type: 18 AWG 19/30 XLP Polyethylene
Select Option Cable Length
mm (inch)
02 300 (11.81)
Termination Specification
Termination Options
Select
Option Description
(Two-wire versions illustrated)
ATinned leads (6.4±0.76)mm
FUntinned leads (6.4±0.76)mm
BDeutsch DTM04-2P
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.
