Micro Switch

CZ Micro Switch

A micro switch, also known as snap-action switch, is a generic term used to refer to an electric switch that is actuated by very little physical force, through the use of a tipping-point mechanism. They are very common due to their low cost and durability, greater than 1 million cycles and up to 10 million cycles for heavy duty models. This durability is a natural consequence of the design. Internally a stiff metal strip must be bent to activate the switch. This produces a very distinctive clicking sound and a very crisp feel. When pressure is removed the metal strip springs back to its original state. Common applications of micro switches include the door interlock on a microwave oven, levelling and safety switches in elevators, vending machines, and to detect paper jams or other faults in photocopiers. Micro switches are commonly used in tamper switches on gate valves on fire sprinkler systems and other water pipe systems, where it is necessary to know if a valve has been opened or shut.
The defining feature of micro switches is that a relatively small movement at the actuator button produces a relative large movement at the electrical contacts, which occurs at high speed (regardless of the speed of actuation). Most successful designs also exhibit hysteresis, meaning that a small reversal of the actuator is insufficient to reverse the contacts; there must be a significant movement in the opposite direction. Both of these characteristics help to achieve a clean and reliable interruption to the switched circuit.

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CZ Micro Switch

Features

  • Virous of actuators, the operation position is adjustable. (such as CZ-7121).
  • Outer shell covered with intensive plastic, water-proof and oil-proof.
  • The mechanical strength is better than CM type of micro swith, bear hitting.
  • Contact Form

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    Ratings

    Rated Voltage
    (V)
    Noninductive Load
    (A)
    Inductive Load
    (A)
    Resistance Load Lamp Load Inductive Load Motor Load
    NC NO NC NO NC NO NC NO
    125VAC
    250VAC
    480VAC
    10
    10
    3
    3
    2.5
    1.5
    1.5
    1.25
    0.75
    10
    10
    2.5
    5
    3
    1.5
    2.5
    1.5
    0.75
    8VDC
    14VDC
    30VDC
    125VDC
    250VDC
    10
    10
    8
    0.5
    0.25
    3
    3
    3
    0.4
    0.2
    1.5
    1.5
    1.5
    0.4
    0.2
    6
    6
    6
    0.05
    0.03
    6
    6
    5
    0.05
    0.03
    5
    5
    2.5
    0.05
    0.03
    NOTES:
      1. Inductive load has a power factor of 0.4 min.(AC) and a time constant of 7 msec.max.(DC).
      2. Lamp load has an inrush current of 10 times the steady-state current,while motor load has an inrush current of 6 times the steady-state current.

    Characteristics


    Operation speed
    0.5mm-50cm/sec
    Operating frequency Mechanical: 120 operations/min.
    Electrical: 30 operations/min.
    Contact resistance 15mΩ max. (initial value)
    Insulation resistance 100mΩ min. (at 500VDC)
    Dielectric strength 1000VAC, 50/60HZ for 1 minute between terminals of the same polarity
    1500VAC, 50/60 HZ for 1 minute between currentcarrying and non-current-carrying metal parts
    1500VAC, 50/60 HZ for 1 minute between each terminal and ground
    Vibration frequency 10-55HZ,1.5mm double amplitude
    Shock Mechanical durable: 1, 000m/Sec2 (about 100G'S)
    Malfunction: 300m/Sec2 (about 30G'S)
    Ambient temperature -5℃ to +65℃
    Humidity <95% RH
    Life Mechanical: 10,000,000 operations above (under rated OT)
    Electrical: 500,000 operations above
    Weight About 60g
    Degree of protection IP65

    Operating characteristics

    Models CZ-7100 CZ-7110 CZ-7310 CZ-7311 CZ-7312 CZ-7120
    OF Max. 600g 600g 600g 600g 600g 150g
    RF Min. 100g 100g 100g 100g 100g 40g
    PT Max. 2.0mm 2.0mm 2.0mm 2.0mm 2.0mm 13.5mm
    OT Min. 0.8mm 5.0mm 6.0mm 6.0mm 6.0mm 4.0mm
    MD Max. 0.8mm 0.8mm 0.8mm 0.8mm 0.8mm 3.2mm
    OP 30.5 ±0.8mm 44 ±1.2mm 21.8 ±1.2mm 33.3 ±1.2mm 33.3 ±1.2mm 25 ±1mm
    FP           35mm

    Models CZ-7140 CZ-7121 CZ-7141 CZ-7124 CZ-7144 CZ-7166
    OF Max. 220g 180g 240g 200g 280g 120g
    RF Min. 60g 50g 80g 60g 100g  
    PT Max. 8.5mm 11.0mm 6.5mm 11mm 6.5mm 250mm
    OT Min. 2.5mm 3.0mm 2.0mm 3.0mm 2.0mm 11mm
    MD Max. 2.0mm 2.4mm 1.5mm 2.4mm 1.5mm  
    OP 25 ±1mm 40 ±1mm 40 ±1mm 50 ±1.2mm 50 ±1.2mm  
    FP 32mm   46mm   56mm  

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