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Conveyor Safety Switches for Material Handling Plants

Most rugged, reliable and dependable range of safety switches, conveyor safety switches, electronic switches, electronic conveyor switches etc. A must for every conveyor and material handling plant. Thousands of switches are in use at cement, fertilizer, steel, mining and power plants. Specially developed field mounting enclosures with added safety features.

Conveyor Safety Switches   Send Enquiry

Conveyor Safety Switches

Protocontrol make Magnetic Proximity Switches are designed for speed sensing application and position and direction sensing. Special hall effect switches are ideal for use in automobile speed sensing applications.

Safety Switches

  • Pull Cord Switch
  • Belt Sway Switch
  • Heavy Duty Limit Switch
  • Zero Speed Switch / Electronic Speed Switch
  • Electronic Speed Switch with Extension Stand
  • Pull Cord Wire
  • Tying Clips
  • Hooks
  • Pull Cord Switch : Series PC

    In today's modern material handling plants multiple numbers of conveyors are used to transfer material from one location to other. Protocontrol make Safety and control products find application for stopping the conveyor at the time of an emergency.

    Types of Pull Cord Switch


    Operation

    Pull cord switch also known as Rope Operated Emergency switch is used as a safety switch to stop the conveyor belt in case of an emergency by pulling the rope. Pull cord switch is mounted on the walkway side of the conveyor belt, preferably at about every 30 meters. When the rope is pulled from any side, the switch gets operated. Unless and until the handle is reset manually to normal position, the switch remains in operated condition. NC contacts of all pull cord switches are wired in series and further connected to PLC. When any switch along the belt operates, the contact opens and conveyor is stopped.

    Construction

    Pull cord switch is housed in dust and weatherproof enclosure with IP 65 grade of protection. Sturdy and heavy-duty Cam- Switch with robust contacts is used to give longer service life. Operating handle fitted with spring steel rings at both ends for fixing the rope. The design of the rings gives maximum flexibility in operating condition. Enclosure is epoxy painted to give high corrosion resistance. The switch is designed with manual reset type of mechanism.

    Features

    • Heavy duty enclosure for dusty industrial use
    • Special tubular silicon gasket
    • Standard Cast Al./DMC/Cast Iron or Flameproof enclosure
    • Retaining type stainless steel screws
    • Heavy duty contacts
    • Special rubber seal (0 ring) on shaft for better protection against ingress of dust& dirt
    • Performance tested at reputed third party lab for 20,000 operations Models with indicating lamp, junction box & flag indication
    • (refer under optional accessories).

    Standard Specifications

    • Reset: Snap action, Manual Reset Type
    • Enclosure : Weatherproof, field mounting Type, IP 65 Cast
      Al/Cast Iron, epoxy painted, colour light gray (Standard)
      other colour are available as per requirement
    • Output Contacts : 1 NO + 1 NC / 2 NO + 2 NC/ 2 NC / 4 NC
    • Contact Rating for standard models : 16 Amp resistive at 440 VAC
    • DMC(FRP)enclosure for use in corrosive environment.
    • Special flame proof enclosure for use in hazardous area, Group IIa, IIb, IIc

    Optional Product Accessories

    • Separate junction Box for termination of cables
    • Indicating lamp: Long life red LED indicating lamp for indication of operated pull cord switch. Please specify lamp voltage.
    • Mechanical flag indicator for pull cord switch
    • Separate reset lever for Pull Cord Switch
    • Addressable Type Pull Cord Switches: Protocontrol offer complete solution for monitoring of entire plant switches at a centralized location. Please send us conveyor details (No. of switches per conveyor, conveyor layout etc). For more details refer our catalogue on: Trip Indicator.
    • Hermetically sealed reed contacts for use in extreme dusty and corrosive conditions : Contact Rating for models with reed switch contact : 30 VA, 24 V DC/ 2 30 VAC,1Amp.(Specify control voltage)

    Optional Commissioning Spares

    Commissioning Spares

    Following accessories are offered optionally with Pull cord switches. These accessories are specially developed in reducing installation time of switches.

    • Pull Cord wire: 6x7 Gl wire construction, covered with PVC diameter approx 5-6 mm specially extruded for material handling plant use.
    • Tying clips : Two tying clips are required per switch for tying pull cord cable to switch.
    • Hook : Pull cord cable passes through the hooks, which are placed approx 3 Meters apart.
    • Separate reset lever for Pull Cord Switch
    • Mounting Bracket : Mounting bracket made of sheet steel, powder coated with corrosion resistance paint f o r mounting pull cord switch. Suitable h oles a re made to mount pull cord switch at site.
    • Cable Gland: Nickel Cr plated brass cable gland, Size 3/4 inch ET

    PULL Cord Switches for special use

    Protocontrol developed special models of pull cord switches for use on applications like automobile conveyors.

    Pull Cord Switch for automobile conveyor POPOSR:

    Pull Cord Switch for automobile conveyor POPOSRPull cord Switch, Single side rope with reset button PC HR

    This switch is to be mounted over the head and nylon rope hangs freely. When operator wants to stop conveyor / machine he pulls the rope. The switch resets when rope is pulled once again. Design with two separate ropes for "Operate "and "Reset "is also available.

    Pull cord Switch, Single side rope with reset button PC HR:

    One side operated switch for small machines. The switch is provided with built in reset button.

    Belt-Sway Switch Series : BS


    With Terminal Strip
    With Junction BoxFlameproof Model
    Switch with mounting bracket

    Application

    The switch allows smooth running of the conveyor and protects it from damages by over swaying which can occur due to uneven loading of material, worn out idler roller bearings etc.

    Operation

    Belt-sway switch is generally mounted on both side, preferably at about every 30 meters s and near the edge of the conveyor belt. As mall clearance is allowed between contact roller and the belt edge to allow the normal running of the belt with acceptable swaying. When swaying exceeds normal limit, the belt edge pushes the contact roller, which drives the switch and operates the contacts. The switch resets automatically when the belt resumes normal running.

    Construction

    The switch is housed in dust and weatherproof enclosure with IP 65 grade of protection. The contact roller is supported on bush / ball bearings for friction free operation. Roller mechanism is of self reset type. The enclosure is epoxy painted to withstand harsh climate.

    Features

    • Heavy duty enclosure for dusty industrial use
    • Special tubular silicon gasket
    • Standard Cast Al. / DMC / Cast Iron or Flameproof enclosure
    • Retaining type stainless steel screws
    • Heavy duty contacts
    • Special rubber seal (0 ring) on shaft for better protection against ingress of dust & dirt
    • Performance tested at reputed third party lab for 20,000 operations.
    • Models with indicating lamp, junction box

    Standard Specifications

    • Reset: Auto/Spring Reset Type
    • Enclosure: Weatherproof, field mounting Type, IP 65 Cast Al / Cast Iron, epoxy painted, colour light gray (standard) other colour are available as per requirement.
    • Output Contacts: 1 NO+1 NC/2NO + 2NC/2NC/4NC
    • Contact Rating for standard models: 16 Amp resistive at 440V AC
    • DMC (FRP) enclosure for use in corrosive environment.
    • Special flame proof enclosure for use in hazardous area,Group IIa, IIib IIc


    Optional Accessories

    • Separate junction Box for termination of cables.
    • Indicating lamp: Long life red LED indicating lamp for indication of operated belt sway switch. Please specify lamp voltage.
    • Addressable Type Belt Sway Switches: Protocontrol offer complete solution for monitoring of entire plant switches at a centralized location. Please send us conveyor details (No. Of switches per conveyor, conveyor layout etc). For more details refer our catalogue on: Trip Indicator.
    • Hermetically sealed reed contacts for use in extreme dusty and corrosive conditions: ContactRating for models with reed switch contact: 30 VA, 24 V DC/230 V AC, 1 Amp. (Please specify your control voltage)

    Optional Commissioning Spares

    Following accessories are offered optionally with Pull cord switches. These accessories are specially developed in reducing installation time of switches.

    • Mounting Bracket
    • Cable Gland
    • Spare Roller Assembly

    Mounting BracketCable Glands

    Heavy Duty Limit Switch Series: HDLS


    Application

    Heavy duty limit switch are extensively used on EOT cranes, conveyors, transfer cars, elevators, steel mills and mobile / material handling equipments for sensing of end limits and position sensing.

    Operation

    The equipment pushes the switch roller / lever actuating the switch contacts. The heavy duty actuating mechanism is designed to absorb hits of heavy machinery without damaging the internal mechanism.
    Limit switches are enclosed in heavy duty weatherproof enclosure. The roller/ lever handle can be provided with different sizes and design to suit specific requirement.

    Construction

    The switch is housed in dust and weatherproof enclosure with IP 65 grade of protection. The contact roller / lever can be provided in various shapes.

    Standard Specifications

    • Enclosure: Weatherproof, field mounting Type, IP 65C a s t Al/Cast Iron, epoxy painted, colour light gray (standard) other colour are available as per requirement. DMC (FRP) enclosure for use in corrosive environment.
    • Output Contacts: 1 NO+1 NC/2NO + 2NC
    • Contact Rating for standard models: 16 Amp resistive at 440 VAC Output Contacts: 1 NO+1 NC/2NO + 2NC
    • Contact Rating for standard models : 16 Amp resistive at 440 VAC
    • Special flame proof enclosure for use in hazardous area,Group IIa, IIib IIc

    Operating Mechanism

    Spring Return roller leverToggle /Snap Action V Lever

    Two types of levers are available.

    • Spring Return roller lever
    • Toggle /Snap Action V Lever

    Optional Commissioning Spares

    Cable GlandMounting Bracket

    Following accessories are offered optionally with Pull cord switches. These accessories are specially developed in reducing installation time of switches.

    • Separate junction Box for termination of cables
    • Cable Gland
    • Mounting Bracket