Electromechanical

US$2.93
Current Rating: 16A@ 125/250V AC. Initial Contact Resistance: 15 Meg ohm (Max.). Insulation Resistance: 500V DC 1000 Meg ohm (Min.). Dielectric Strength: 1000V AC for 1 Minute. Contact Material: Silver. Terminal Material: Brass - Silver Plate. Terminal Type: .187” Quick Connect.
Delivery within 2-3 weeks
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US$2.67
Current Rating: 10A@ 125/250V AC. Initial Contact Resistance: 15 Meg ohm (Max.). Insulation Resistance: 100 Meg ohm (Min.) at 500VDC. Dielectric Strength: 1000V AC 50/60 Hz for 1 Minute. Contact Material: Silver. Terminal Material: Brass - Silver Plate. Terminal Type: .250” Quick Connect. 
Delivery within 2-3 weeks
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US$4.09
This is a small board the allows you to add resistors to a 10-position rotary switch (COM-13253), turning it into a potentiometer with 10 discrete steps.
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US$1.18
Fuseholder with screw cap for European GMA/GDL (20mm x 5mm) fuses. Fuse not included.
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US$15.33
This consists of a plastic valve body, a water rotor, and a hall-effect sensor. When water flows through the rotor, rotor rolls. Its speed changes with different rate of flow.
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US$13.99
Type: Miniature PCB Relay. DC Coil Voltage: 12 V. Maximum AC Voltage Rating: 240 V. Relay Construction: Non-Latching. Contact Material: Silver Nickel. Maximum DC Voltage Rating: 24 V.
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US$13.93
They have extremely fine step precision of about 1/2 a degree per step for single stepping, fast response for quick movements, and a range of  ~315° degrees.
Delivery within 2-3 weeks
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US$20.93
The EasyDriver is a simple to use stepper motor driver, compatible with anything that can output a digital 0 to 5V pulse (or 0 to 3.3V pulse if you solder SJ2 closed on the EasyDriver). It requires a 6V to 30V supply to power the motor and can power any voltage of stepper motor.
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US$0.69
This breadboard friendly Tactile Momentary Pushbutton Switch is excellent for your electronic projects.
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US$6.25
Make an air aerial propeller vessel, a cooling system, or spinning machine with this small fan module. It comes with a propeller, a 15,000 rpm motor and cable. Add flavor to your own interesting projects with this module.
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US$5.53
Dimensions: 34 × 41 × 6.5 mm. Includes: 1x Magnetic Door Switch Set. 4x Phillips Mounting Screw. Features: Max Voltage: ≤100VDC. Max Current: ≤500mA. Max Rating: ≤10W. Gap: 20±5mm. Contact Mode: NO/NC.
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US$10.43
These aluminum gearmotor brackets let you securely mount Pololu’s 25D mm metal gearmotors to your project. 
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US$3.47
This is a single pole, 10 position rotary switch able to select up to 10 different states in a durable package. Unlike our other rotary switch, this model is much more robust and capable of handling larger currents and voltages.
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US$51.73
This cylindrical, 2.62" x 0.98" x 0.98" gearmotor uses a brushed DC motor with extra-strong magnets and a 74.83:1 metal gearbox to deliver a lot of power in a relatively small package.
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US$1.33
MTG Screw Holes L = 1" (25mm). MTG Screw Holes Dia = .01" (2.5mm). Body L = 0.875" (22.2mm). Body W = 0.50" (12.7mm). Top Bezel L = 1.375" (35mm). Top Bezel W = 0.50" (12.7mm). Overall Depth = 0.5" (12.7mm).
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