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    High Temperature Limit Switch with Top Plunger

    5 out of 5 based on 1 reviews | Write a review
    There are two types of high temperature top plunger limit switch, one has a sealed top ball plunger and the other has a sealed top plunger without ball. The top plunger can reset automatically. High temperature limit switch can be used in the environment temperature 350℃ (622℉). The rated current and voltage are customizable, such as 10A/120VAC, 2A/48VDC, etc. The default value is 5A/220VAC. It also has fully enclosed 1NO + 1NC contact switches, which is casting from high temperature resistant material.
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    Delivery date: 6-12 days

    High temperature limit switch has two types of top plunger, with contact type 1NO + 1NC and rated current/voltage 5A/220VAC.


    Weight 258g
    Shape of top plunger * Top plunger without ball Top ball plunger
    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):
    High temperature limit switch with top plunger dimension
    Note: In the diagram, OP means operation position, at which the external force is applied to the drive lever to make the movable contact just operating from the state of the free position. PT means pretravel, the distance the drive rod moves from the free position to the operation position.

    Tips: 6 mechanical considerations for limit switches

    1. To ensure a high degree of reliability, limit switch must be used within a suitable contact force range.
    2. When using normally closed circuit (NC), the setting of the operating object must ensure that the actuator can return to the free position. In addition, when using normally open circuit (NO), the actuator must be pressed to 70~100% of the specified value of the over travel (OT) (60~80% of the total travel (TT)) in order to absorb minute oscillations and errors.
    3. If the stroke is set near the operating position (OP) and return position (RP), it may cause contact instability. In addition, if it is setting at the total travel position (TTP), the actuator and built-in switch may be damaged due to the inertia of the operating object, so adjust the stroke using the mounting plate and the operating object.
    4. If the actuator is often in pressed condition, it will cause initial failure and poor reset. Please maintain and replace it regularly.
    5. About the mechanical conditions at the time of limit switch selection - The actuator must be selected according to the operation mode. Please confirm the operating speed and operating frequency.
      1. When the operation speed is extremely slow, the switching of the contacts will be unstable, which may cause problems such as poor contact or welding.
      2. When the operation speed is extremely fast, and the impact force of the action may destroy the switch. If the frequency is too high, the contacts may not be able to switch in time, so please do not use it beyond the specified frequency.
    6. Please do not apply excessive force to the drive rod. Damage or poor activity may result. Set the stroke within the appropriate range for each model. Use beyond the range, may break the limit switch.
    Existing reviews of High Temperature Limit Switch with Top Plunger
    High temperature limit switch with meticulous packaging
    This high temperature limit switch was delivered at the specified time, packed carefully, and the item was not damaged at all. I am very satisfied with it and will continue to buy it in the future.
    From: Turbodelta | Date: 12/08/2021
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    High Temperature Limit Switch with Roller Plunger

    There are two types of roller plunger limit switch, the roller direction of the one is parallel to the mounting surface, and the other is perpendicular to the mounting surface. Roller plunger has automatic reset function. It is also high temperature limit switch with the fully enclosed 1NO + 1NC contact switches 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 default rated current and voltage is 5A/220VAC. Other values are customizable, such as 3A/480VAC, 0.8A/120VDC, etc.