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"SKA Series" Rotary Limit Switches

Model:  SKA Series / RLS-4139

Part N° Max Voltage (AC) Max Voltage (DC) Max. Amps (AC) Max. Amps (DC) Gear Ratios Max. Worm Rev. Max. Rise Max. Allowable Drift Notch Adjustment Guide Price Quantity
4139-T22124
SKA6000AT10
250 125 15 .50 10:1 1095 1095/TPI 24/TPI 1/TPI Quote Required
4139-T22125
SKA6000AT20
250 125 15 .50 20:1 2190 2190/TPI 48/TPI 2/TPI Quote Required
4139-T22126
SKA6000AT40
250 125 15 .50 40:1 4380 4380/TPI 96/TPI 4/TPI Quote Required
4139-T22127
SKA6000BT10
480 250 15 .50 10:1 750 750/TPI 29/TPI 1/TPI Quote Required
4139-T22128
SKA6000BT20
480 250 15 .50 20:1 1500 1500/TPI 57/TPI 2/TPI Quote Required
4139-T22129
SKA6000BT40
480 250 15 .50 40:1 3000 3000/TPI 115/TPI 4/TPI Quote Required
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Rotary limit switch for use on machine and ball screw actuators.

SKA Series Rotary Limit Switch

Features

  • Available in two control voltage ratings : 250 or 480, and in three gear ratios.
    Rotary Limit Switch
  • Can be used in applications where there is a need to control equipment that rotates and/or reverses.
  • Sturdy and compact. Constructed of corrosion-resistant materials, with housing of black anodized aluminium.
  • Meets NEMA-4 water tightness requirements.
  • Simple to adjust, two stitches one for up/stop and one for down/stop, are activated by the adjustable limit switch nuts which travel laterally when the internal screw is rotated through gear reduction.
  • Operating temperature range -20° to + 150°F.
  • Lifetime lubricated.
  • Can be mounted on right or left extension of actuator worm shaft in any of four quadrants.
  • Optional 4-position limit switch available.

Rotary Limit Switch Performance Specifications

Model No. Max Voltage Max. Amps Gear Ratios Max. Worm Rev. Max. Rise Max. Allowable Drift Notch Adjustment
AC DC AC DC
SKA6000AT10 250 125 15 .50 10:1 1095 1095/TPI 24/TPI 1/TPI
SKA6000AT20 20:1 2190 2190/TPI 48/TPI 2/TPI
SKA6000AT40 40:1 4380 4380/TPI 96/TPI 4/TPI
SKA6000BT10 480 250 15 .50 10:1 750 750/TPI 29/TPI 1/TPI
SKA6000BT20 20:1 1500 1500/TPI 57/TPI 2/TPI
SKA6000BT40 40:1 3000 3000/TPI 115/TPI 4/TPI
Rotary Limit Switch Mounting And Adjustment

Limit Switch Field Installation Dimensions

Limit Switch Field Installation Dimensions

Worm Shaft Dimensions

Capacity "B" Mounting Dimensions Worm Shaft Diameter
2 & 3 Ton MS 6 3/4 .500
3 Ton MS 6 3/4 .625
5 Ton MS & BS 7 3/4 .750
10-15 Ton MS & BS 8 3/4 1.000
20 Ton MS & BS 8 3/4 1.000
25 Ton MS & BS, 35 Ton MS 10 1/4 1.375
50 Ton MS & BS 14 1/4 1.500
75 Ton MS 15 1/4 1.750
100 Ton MS 14 3/4 1.750
150 Ton MS 14 3/4 1.875
Rotary Limit Switch Wiring Diagram

Rotary Limit Switch Electrical Wiring Diagram and Setting Instructions

  1. CAUTION: Disconnect power before making any adjustment.

  2. Check drift before adjusting limits.

  3. Remove screw "A" and nut guide keeper "B" to adjust limits.

  4. Run actuator unit to desired limit.

  5. Rotate appropriate nut until switch clicks, then turn 1/2 turn more.

  6. Replace "A" and "B".

  7. Run actuator unit to other limit.

  8. Repeat steps 2, 4 and 5 to adjust this nut.

  9. Slight adjustments may be necessary.

120-RotaryLimitSwitches.pdf

Rotary Limit Switches

(approx. 0.2Mb)

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