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Honeywell MICRO SWITCH SZL-VL-S Miniature Limit Switch

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Installation Instructions

for the MICRO SWITCH SZL-VL-S Miniature Limit Switch

WARNING: PERSONAL INJURY
DO NOT use these products as safety or emergency stop devices or in any other application where failure of the product could result in personal injury.
Failure to comply with these instructions could result in death or serious injury.

WARNING: IMPROPER INSTALLATION

  • Consult with local safety agencies and their requirements when designing a machine control link, interface, and all control elements that affect safety.
  • Strictly adhere to all installation instructions.

Failure to comply with these instructions could result in death or serious injury.

Multiple language versions of installation instructions and other documents are available on Honeywell’s website. To access:

  1. Go to https://sps.honeywell.com/us/en/support/sensing-and-iot/micro-switch-limit-switch-installation-instructions
  2. Select the product’s instructions from the installation instruction section.

Figure 1. SZL-VL Wiring View

Fig 1

INSTALLATION INFORMATION

  1. Refer to
    • Page 4 for switch mounting torque
    • Page 5 for specifications
  2. For mounting, note mounting dimension drawing for hole locations (Figure 5).
  3. Mount switch
    3a. Torque switch to mounting surface: 2,5 Nm to 3 Nm [22.1 in-lb to 26.6 in-lb] using M4 screw
    3b. Care should be taken to ensure that all mounted hardware cannot become detached during the operational lifetime in the intended application
  4. Loosen the screws on the switch’s cover and remove it.
  5. For switches where the cable gland is not provided, use a gland rated Type 1 or higher to maintain the integrity of the enclosure-type rating.
  6. Loosen gland cover, then torque the gland to the switch’s cover using 1 Nm to 2 Nm [8.85 in-lb to 17.7 in-lb] of force. Ensure the o-ring was assembled between the gland and the switch cover.
  7. Use copper conductors rated at 75°C or higher. Thread the cable through the gland cover and gland, then press the wire into the contact block’s terminals.
  8. Refer to circuit diagram on switch’s cover. Insert the terminals into the switch and then fully fix terminal screws: 0,5 Nm to 0,6 Nm [4.42 in-lb to 5.31 in-lb].
  9. Perform functional tests. After wiring, use a voltmeter to ensure when the switch is operated (turned off and on) that a change of state occurs.
    9a. Confirm the normal closed contacts open when actuator is pushed or lever is rotated.
    9b. Confirm the normal open contacts closed when actuator is pushed or lever is rotated.
  10. Reassemble up cover, and torque it: 0,5 Nm to 0,6 Nm [4.42 in-lb to 5.31 in-lb] using M3 screw.
  11. Reassemble gland cover (0,8 Nm to 1,5 Nm torque)

MICRO SWITCH SZL-VL-S Miniature Limit Switch

fig 2

Figure 2. SZL-VL Exploded ViewSIDE ROTARY HEAD DIRECTION CHANGE
Figure 3. Rotary Head Direction Change

fig 3
  1. Disassemble the head’s cross-type (combo-head) screw. Do not loosen or remove the other two Torx® screws.
  2. Remove the switch cover by loosening the three (3) cover screws.
  3. Lift slightly on the switch head.
  4. Rotate the switch head to the desired direction ensuring the clip is still engaged with the head-neck slot.
  5. If clip dislodges, return the clip to its location above the contact blow and below the top of the switch housing by fully re-inserting the clip.
  6. Re-insert the cross-type (combo head) screw to re-assemble the switch’s head, 0,4 Nm to 0,5 Nm [3.54 in-lb to 4.42 in-lb].

PLUNGER HEAD DIRECTION CHANGE
Figure 4. Plunger Head Direction Change

fig 4
  1. Remove the switch cover by loosening the three (3) cover screws.
  2. Use flat screw driver to lift up the clip.
  3. Rotate the switch head to the desired direction.
  4. Properly align the two pins on the switch’s head into the holes on the switch’s body.
  5. Return the clip to its location above the contact blow and below the top of the switch housing by fully re-inserting the clip.

MICRO SWITCH SZL-VL-S Miniature Limit Switch
Figure 5. Installation Screw Identification and Torque

fig 5

Table 1. Installation Screw and Torque

 ScrewDescription (see Figure 5) Screw type Installation torque
1Installation screw for coverM3 x 21machine screw0,5 Nm to 0,6 Nm[4.42 in-lb to 5.31 in-lb]
2Installation screw for coverM3 x 5  machine screw0,5 Nm to 0,6 Nm[4.42 in-lb to 5.31 in-lb]
3Installation screw for headM2.5 screw0,4 Nm to 0,5 Nm[3.54 in-lb to 4.42 in-lb]
4Installation screw for fixed leverM4 machine screw0,65 Nm to 0,85 Nm[5.8 in-lb to 7.5 in-lb]
5Installation screw for adjustable leverM4 machine screw2,5 Nm to 3 Nm[22.1 in-lb to 26.6 in-lb]
6Terminal screwM3 x 6 screw with assembled lock washer0,5 Nm to 0,6 Nm[4.42 in-lb to 5.31 in-lb]
7Grounding screwM3 x 5.5machine screw0,5 Nm to 0,6 Nm[4.42 in-lb to 5.31 in-lb]
8Installation screw for productM4 machine screw2,5 Nm to 3 Nm[22.1 in-lb to 26.6 in-lb]

Table 2. Performance Specifications

CharacteristicParameter
DescriptionMiniature industrial limit switch
ApprovalsCCC, CE, cULus
Housing materialDie-cast metal housing with glass-filled, flame-retardant thermoplastic cover UL 94 flame spread testing: V-0 rated
Electrical connectionConduit entry or cable gland
Contact designSnap-action (all versions)Positive-opening contacts (side-rotary version only)
Contact materialSilver alloy
Electrical ratingsAC-15 A300 (380 Vac/0.5 A) DC-13 Q300 (220 Vdc/0.05 A)
Thermal current (Ith)10 A/250 Vac (EN 60947-5-1)
Initial contact resistance< 25 mOhm
Insulation resistance>100 MOhm at 500 Vdc
Impulse voltage2500 Vdc
Dielectric voltage1890 Vac for metal housing, 1890 Vac between all terminals to enclosure after durability test
Leakage current< 10 mA
Pollution degree3
Environmental sealingIP67
Operating  temperature-20°C to 70°C [-4°F to 158°F] (with no icing)
Humidity95 %RH
Shock30 G, conforming to IEC 60068-2-27
Vibration10 G, 10 Hz to 55 Hz displacement amplitude 0,75 mm, conforming to IEC 60068-2-6 (wobble excluded)
MCTF (Mechanical life)10M cycles @ 120 cpm max.
MCTF (Electrical life)0.5M cycles @ 30 cpm max. under the rated resistance load
Operating speed0,05 mm/s to 2 m/s (based on pin plunger limit switch)
Operating frequencyMechanical: 120 ops/min; Electrical: 30 ops/min
Weight120 g to 150 g
fig 6,7,8

Table 3. Specifications

Catalog listing1ActuatorRoller/pin plungerLeverFree positionPretravel max. mm [in]Differential travel max. mm [in]Overtravel min. mm [in]Min. travel to achievpositive openingOperating force/torque (max.)Bar chart
SZL-VL-S-A-N-MSide rotary, fixed leverNylon roller, Ø18 x 6,5[Ø0.71 x 0.25] Steel, R30 0° 25° 15° 70° 40°18 Ncm[1.59in-lb]         
SZL-VL-S-I-N-MSide rotary, fixed leverSteel roller, Ø18 x 6,5[Ø0.71 x 0.25]Steel, R3025°15°70°40°18 Ncm[1.59in-lb]
SZL-VL-S-B-N-MSide rotary, adjustable leverNylon roller, Ø18 x 6,5[Ø0.71 x 0.25] Steel, R30 to R70 0° 25° 15° 70° 40°18 Ncm[1.59in-lb]
SZL-VL-S-J-N-MSide rotary, adjustable leverSteel roller, Ø18 x 6,5[Ø0.71 x 0.25] Steel, R30 to R70 0° 25° 15° 70° 40°18 Ncm[1.59in-lb]
SZL-VL-S-C-N-M Side rotary, adjustable rod –Metal rod, Ø2,5 mm [0.1 in],125 mm[4.92 in] long 0° 25° 15° 70° 40°18 Ncm[1.59in-lb]
SZL-VL-S-D-N-M Top pin plungerMetal pin, Ø6,6 [0.26] –27 ±0,8[1.04±0.03]*2[0.08]1,5[0.06]3,5[0.14] n/a9 N[2.02 lb]         
SZL-VL-S-H-N-MTop roller plungerSteel roller, Ø12,5 x 3,8[Ø0.5 x 0.15] –38,5 ±0,8[1.5±0.03]*2[0.08]1,5[0.06]3,5[0.14] n/a9 N[2.02 lb]
SZL-VL-S-E-N-MTop cross roller plungerSteel roller, Ø12,5 x 3,8[Ø0.5 x 0.15] –38,5 ±0,8[1.5±0.03]*2[0.08]1,5[0.06]3,5[0.14] n/a9 N[2.02 lb]
SZL-VL-S-F-N-MWobble, coil spring and nylon rod –Ø5,8 mm [0.23 in] coil spring with plastic rod 0° 30° – 20° n/a 2 N [0.45lb]         
SZL-VL-S-G-N-MWobble, coil spring and metal wire –Ø5,8 mm [0.23in] coil spring with Ø1,2 mm [0.05in] metal wire 0° 30° – 20° n/a 2 N [0.45lb]
SZL-VL-S-K-N-MWobble, coil spring –Ø5,8 mm [0.23 in] coil spring 0° 30° – 20° n/a2 N [0.45lb]

Specifications are exactly the same for the -N and -M with cable gland option
(from the center of the mounting hole)

fig 9,10
fig 11,12
fig 13,14
fig 15,16
fig 17,18

Actuator should use bevel block for fixed lever, adjustable lever and top roller plunger

fig 20

sps.honeywell.com/ast
When wiring, leave enough space for cable.

fig 21

Warranty/Remedy

Honeywell warrants goods of its manufacture as being free of defective materials and faulty workmanship during the applicable warranty period. Honeywell’s standard product warranty applies unless agreed to otherwise by Honeywell in writing; please refer to your order acknowledgement or consult your local sales office for specific warranty details. If warranted goods are returned to Honeywell during the period of coverage, Honeywell will repair or replace, at its option, without charge those items that Honeywell, in its sole discretion, finds defective. The foregoing is buyer’s sole remedy and is in lieu of all other warranties, expressed or implied, including those of merchantability and fitness for a particular purpose. In no event shall Honeywell be liable for consequential, special, or indirect damages.

While Honeywell may provide application assistance personally, through our literature and the Honeywell web site, it is buyer’s sole responsibility to determine the suitability of the product in the application.
Specifications may change without notice. The information we supply is believed to be accurate and reliable as of this writing. However, Honeywell assumes no responsibility for its use.

FOR MORE INFORMATION

Honeywell Advanced Sensing Technologies services its customers through a worldwide network of sales offices and distributors. For application assistance, current specifications, pricing or the nearest Authorized Distributor, visit our website or call:
USA/Canada +1 302 613 4491

USA/Canada           +1 302 613 4491
Latin America          +1 305 805 8188
Europe                    +44 1344 238258
Japan                       +81 (0) 3-6730-7152
Singapore                +65 6355 2828
Greater China          +86 4006396841

Honeywell
Advanced Sensing Technologies
830 East Arapaho Road
Richardson, TX 75081
sps.honeywell.com/ast

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Documents / Resources

Honeywell MICRO SWITCH SZL-VL-S Miniature Limit Switch [pdf] Installation Guide
MICRO SWITCH SZL-VL-S, Miniature Limit Switch

References

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