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    High Temperature Limit Switch with Fork Lever

    5 out of 5 based on 1 reviews | Write a review
    High temperature limit switch adopts a fork lever with a radius of 38mm. The fork lever is different from single roller lever because it is unable to reset automatically. So fork lever limit switch is suitable for the travel control of reciprocating motion machinery. The fully enclosed 1NO + 1NC contact switches are casting from high temperature resistant material. It can be used in the environment temperature 350℃ (622℉) and without being damaged by oxidation or pollution. The rated current and voltage is 5A/220VAC. Other voltage are customizable, such as 24VDC, 48VDC, 120VAC, 380VAC, 480VAC, etc.
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    High temperature limit switch has fork lever with 38mm radius, contact type 1NO + 1NC and rated current/voltage 5A/220VAC.


    Weight 258g
    Radius of fork lever 38mm
    Rated voltage 220VAC (Customizable rated voltage is shown in the reference table below.)
    Rated current 5A (Customizable rated current is shown in the reference table below.)
    Contact type 1NO+1NC (NC pin: 1 & 2, NO pin: 3 & 4)
    Operating speed 1mm/s~2m/s
    Operating frequency Machinery: 120 times/minute
    Electric: 30 times/minute
    Contact resistance <15MΩ, initial stage
    Insulation resistance >100MΩ (<500VDC)
    Withstand voltage Between no-connection terminals: 1000VAC, 50/60Hz lasts 1 minute
    Between the terminal and the contact: 2000VAC, 50/60Hz lasts 1 minute
    Between terminal and no-load current metal: 2200VAC, 50/60Hz lasts 1 minute
    Vibration Misoperation endurance: 10~55Hz, 1.5mm, double-amplitude
    Impact Mechanical endurance: >1000m/s2 (>100G)
    Misoperation endurance: >300m/s2 (>30G)
    Shell material Cast aluminum alloy
    Temperature -10~+350℃ (14~622℉)
    Humidity <95%RH
    Working life Machinery: >15million times
    Electric: >0.5million times
    Protection class IP66

    Reference table for customizable rated voltage and rated current:

    Rated voltage Rated current (A)
    Non-inductive load Inductive load
    Resistive load Lamp load Inductive load Motor load
    125VAC 10 3 1.5 10 5 2
    250VAC 5 2 1 5 3 1.0
    480VAC 3 1.5 0.8 3 1.5 0.8
    600VAC 1 1 0.5 1.5 1 0.5
    8VDC 10 6 3 10 6
    14VDC 10 6 3 10 6
    30VDC 6 4 3 6 4
    125VDC 0.8 0.2 0.2 0.8 0.2
    250VDC 0.4 0.1 0.1 0.4 0.1


    1. Power factor of inductive load is above 0.4 (AC). The time constant is below 7ms (DC).
    2. The inrush current of lamp load is 10 times that of steady state current, and the inrush current of motor load is 6 times that of steady state current.

    Dimension (unit: mm):

    Tips: Different types of limit switch

    Direct-acting limit switch: The working principle of the direct-acting limit switch is similar to that of the control button, except that it uses the bump on the moving part to hit the push plunger of the limit switch. Direct-acting travel switch is produced by the moving machinery colliding. When the operating plunger is bumped, the internal micro switch is compressed and pressed inward. When the machine is moved away, the limit switch is reset under the action of the internal spring.
    The advantage of plunger limit switch is that the structure is simple and the cost is low. The disadvantage is that the opening and closing speed of the contacts depends on the speed of the built-in plunger. If the built-in plunger moves too slowly, the contacts cannot cut off the circuit instantaneously, so that the arc stays on the contacts for too long, which is easy to burn out the contacts. Therefore, plunger limit switch should not be used in situations where the travel speed of the operation object is less than 0.4m/min.
    Plunger limit switch composition: Plunger, built-in spring, move-disconnect contacts and move-connect contacts.

    Roller rotary limit switch: This switch adopts a roller rotary structure with instantaneous action, which can reduce the burning of the arc to the contact and ensure the reliability of the movement. Roller limit switch is suitable for low-speed moving machinery.
    There are two types of roller travel switches, one is a single-roller limit switch, and the other is a double-roller limit switch.

    1. Single-roller travel switch
      When the stopper of the moving machine is pressed onto the roller of the limit switch, the transmission lever drives the rotating shaft, so that the cam pushes the built-in plunger, and when the built-in plunger hits a certain position, it pushes the built-in switch to move quickly. When the stopper on the roller is removed, the return spring resets the roller limit switch.
    2. Double-roller travel switch
      The double-roller limit switch also called as fork lever limit switch. It cannot be restored automatically. Fork lever limit switch relies on the reverse movement of the moving machine to restore. When the stopper reverse hits the other roller, the limit switch will be restored.

    Composition of roller travel switch: Roller, upper arm, spring, sleeve, pulley, pressure plate, contacts and horizontal plate.

    Existing reviews of High Temperature Limit Switch with Fork Lever
    Perfect switch!
    I bought this high temperature limit switch for weeks. It did a good job and I love it very much. Terminals are well-built and terminal screws do not strip out easily. I would buy it again if I need.
    From: Hardy | Date: 26/04/2022
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