Part of the Honeywell SE Series, the 1SE1 is engineered for applications requiring accurate actuation, compact size, and dependable performance under vibration and temperature variations. The unit incorporates a pin plunger actuator, wire lead termination, and a rugged chassis-mount design suitable for integration into equipment where space and reliability are critical.

The switch is rated for 5 amps at 250 VAC and 5 amps at 30 VDC, providing versatile switching capability for low- to moderate-power electrical circuits. Its sealed construction and wide operating temperature range make it suitable for harsh environments, including aerospace systems and equipment exposed to vibration, temperature cycling, and demanding operating conditions.

Key Features
Manufacturer: Honeywell
Part Number: 1SE1
Description: Sensitive Switch / Snap-Action Switch
Series: Honeywell SE Series
Switch Type: Subminiature snap-action switch
Contact Configuration: SPDT (Single Pole Double Throw)
Actuator Type: Pin plunger
Termination: Wire leads
Mounting Type: Chassis mount
Current Rating: 5A
Voltage Rating: 250 VAC / 30 VDC
Operating Force: Approximately 141–482 gf
Operating Temperature Range: Approximately -53°C to +105°C
Ingress Protection: Waterproof/sealed versions available depending on configuration
Body Dimensions: Approximately 20.3 × 6.3 × 12.7 mm
Applications: Aerospace controls, position sensing, limit detection, electrical interlocks, and industrial control systems. 

Benefits
Provides precise and repeatable switching action
Compact design for installations with limited space
SPDT configuration allows flexible circuit control
Designed for long service life and reliable operation
Suitable for vibration-prone and temperature-variable environments
Supports maintenance and replacement requirements in certified equipment applications

Typical Applications
Aircraft electrical control systems
Position and limit sensing mechanisms
Access door and panel monitoring systems
Control panels and instrumentation
Industrial automation and safety interlock circuits