R R Engineers Pimpri Chinchwad, Pune, Maharashtra

APPLICATION Monitoring speed is a critical aspect of automation and process safety. The Zero Speed Switch (ZSS), also known as a Speed Actuating Sensing Switch, is a vital device used to detect the stoppage or an unacceptably slow movement of a rotating shaft. The electronic speed switch is ideally suited for the speed monitoring of critical elements of any material handling system such as conveyors, elevators, crushers etc. The switch sense under speed or over speed conditions in the system by non-contact method and provides output contact for protection, control and interlock purposes. In case of sequential start-up, the speed switch can be used to ensure that the feeder conveyor starts up only when the downstream conveyor has attained desired speed and likewise during shutdown it can be used to ensure that the downstream conveyor stops only when the feeder belt has stopped. Other applications include detection of jamming in the system which results in under speed condition or snapping of the belt which results in zero speed condition at driven end and so on. CONSTRUCTION RRE Zero Speed Switch (ZSS) is housed in a dust and weatherproof DMC (Dough Moulding Compound) enclosure, offering IP65 grade protection. It is available in a wide range of speed settings, from 01 RPM to 9999 RPM, supporting both under-speed and over­ speed monitoring to suit various industrial applications. For each model, the typical adjustable speed ratio (minimum to maximum speed) is 1:3 or 1:5. This ratio can be customized further based on specific application requirements. The controller unit includes 03 LED indicators that display: ■ Input power status ■ Pulse input from the sensor probe ■ Relay on/off status   In addition, 04 Digit, 07 Segment LED display provides real-time readings of: ■ Under-speed value ■ Over-speed value ■ Current speed value ■ Error status (in the event of a speed fault)   To avoid false alarms during machine startup, the unit features an Initial Time Delay (ITD) of 30 seconds. It also incorporates Nuisance Tripping Delay (NTD) - adjustable from 0 to 60 seconds-to prevent relay dropout due to brief speed fluctuations. The ZSS controller supports input power supplies of 110 VAC or 240 VAC (50/60 Hz) or 24 VDC. The standard sensor probe measures 30 x 65 mm, includes a 2-meters cable, and offers a sensing distance of 10 mm. The unit is compatible with both NPN Normally Open (NO) and PNP Normally Open (NO) type of sensor probes. Probes with longer sensing ranges can be provided upon request. The sensor probes are IP 67 grade complaint. All configuration settings are accessible only by removing the unit's cover, as a standard safety and tamper-prevention measure. 12 pin Terminal Strip is provided for all input and output connections. ADVANTAGES ■ Non-contact sensing - no moving parts, zero wear and tear ■ Maintenance free - no rollers or couplings ■ Dust/oil/water-proof sensor-suitable for harsh industrial environments ■ Wide speed setting-from 01 RPM to 9999 RPM ■ Support for multiple flag settings (01, 02, 04 & 08) ■ Built-in time delays-for startup bypass and nuisance tripping prevention ■ Under Speed and Over Speed monitoring in a single unit

Current Range : 6A

Country of Origin : India

Mechanical Life : 1 Year

Type : Zero Speed Switches,Under And Over Speed Monitor

Application : Industrial

Condition : New

Design : Standard

Color : Black

Shape : Rectengular

Material : DMC (Dough Mould Compound)

Brand Name : R R ENGINEERS

Voltage : 110 VAC / 230 VAC / 24 VDC

Display : 04 Digit LED Display

APPLICATION Wherever there is a Belt Conveyor, a safety device is required. Pull Cord Wire Rope is a crucial component in the emergency stop system of conveyor belts, used in conjunction with Pull Cord Switches and run all along with conveyor to attach with the Pull Cord switches. It enables quick and reliable manual shutdown of conveyors from any accessible point along the length of the belt. This system is widely used in mining, cement, steel, power plants, ports, and material handling industries, ensuring safety of personnel and equipment. A well-installed and properly tensioned Pull Cord Wire Rope system ensures effective and rapid shutdown of conveyor systems in emergencies, playing a vital role in plant safety and accident prevention. CONSTRUCTION Pull Cord Wire Rope is designed for durability, flexibility, and resistance to environmental stress. Key construction features include꞉ Material꞉ 06 x 07 construction with use of high-tensile, galvanized steel wire strands for strength and corrosion resistance. The wire is specially extruded for material handling plant use. Diameter꞉ Typically ranges from 05 mm to 06 mm. Coating꞉ PVC coating is applied for additional protection in corrosive or damp      environments.  The PVC coating also offers protection against ultra-violate light. End Termination꞉ Equipped with thimbles, eye hooks, turnbuckles, and clamps to ensure secure anchoring and proper tension adjustment (procured separately from local hardware store). OPERATION The Pull Cord wire rope is mounted on either side of the conveyor using anchor points and tensioning hardware. It is connected to the pull cord switch lever. When pulled from any point along its length꞉ 1.     The rope exerts a mechanical force on the actuating arm of the Pull Cord Switch. 2.     This action triggers the internal switching mechanism. 3.     The switch then sends a signal to stop the conveyor immediately, activating safety alarms or interlocks if configured. 4.      After actuation, the switch must be manually reset to resume conveyor operation. ORDERING INFORMATION The Pull Cord Wire Rope is available in bundles of 100 meters or 250 meters.

Standards : 06 X 07 Construction (42 Strands)

Coating : PVC

Length : 100 Meters Bundle

Diameter : 06 mm

Material : GI Steel Wire

Color : Red

Brand Name : R R ENGINEERS

Type : Pull Cord Wire Rope

This model CS 101 of Pull Cord Switch will have 01 NO & 01 NC Contact pair along with powder coated MS Lever with SS Rings for attaching Wire Rope.   Our switches are housed in non-corrosive dust and waterproof D.M.C (Dough Moulding Compound) enclosure having IP 65 grade protection and is able to withstand any harsh climatic conditions. Contacts are rated for 16 Amps at 440 Volts AC. Operating handle mechanism is manual reset type. Easy termination of cable through 02 Nos. of 3/4" B.S.C. threaded cable entry holes. Switch is generally mounted at a distance of 15 metres.   APPLICATION There are several safety switches used in the belt conveyor to operate in emergency conditions. Pull Cord Switch is one of them, which operator or user can operate to stop the belt conveyor instantly when an accident happens.   Since the Pull Cord Switch is so designed that it should be installed at the side of belt conveyor and the pull cord should be mounted along conveyor, the switch can be actuated at any position. Pull Cord Switch is a switch that is mounted along a conveyor stringer and is manually actuated by a cord that runs the full length of the conveyor. The cord can then be pulled at any point on the conveyor as an emergency stop. CONSTRUCTION As these switches are used as safety or emergency switch, it is not operated very frequently therefore construction of these switches is such that it should be operated immediately though it kept idle for long time.   RRE Pull Cord Switch is housed in dust and weatherproof D.M.C (Dough Moldings Compound) enclosure having IP 65 grade of protection. Sturdy and heavy-duty CAM switch with robust contacts is used to give longer service life. Powder coated operating handle is fitted with spring steel rings at both ends for fixing the rope. Design of the rings gives maximum flexibility in operating condition. The switch is designed with manual reset type mechanism. Contacts are rated for 16 Amps at 440 Volts AC. OPERATION The Pull Cord Switch is mounted on the walkway side of the conveyor belt, preferably at about every 15 to 20 meters. Rope is tied to the end rings of the handle and is carried opposite to each other. When an accident occurs in the belt conveyor, the worker can stop the belt conveyor at any position with pulling the cord in order to drive the lever. The rotation put the torsion spring in motion to drive the CAM into the displacement. Then it drives the Limit Switch to cut down the control wiring. Thus, the belt conveyor can stop operation. Unless and until the handle is reset to normal position manually, the switch remains in operated condition.   All the Pull Cord Switches installed along an individual belt are electrically wired in series and connected to the control station by a two-core cable. Therefore, actuation of any one of these pull cord switches will stop the concerned conveyor until the particular switch is manually reset.

Material : DMC (Dough Mould Compound)

Surface Finishing : Pigmented Black

Shape : Rectangular

Color : Black

Condition : New

Application : Emergency Stopping of Conveyor

Type : CS 101

Warranty : 01 Year

Brand Name : R R ENGINEERS

This model BS 101 of Belt Sway Switch comes with 01 NO + 01 NC Contacts along with SS Roller handle. The switch is housed in Pigmented Black DMC Enclosure which is shock proof, weather proof and corrosion resistant. It has similar strength to metal enclosure which ensure it can withstand harsh outdoor environment. The enclosure offers IP 65 grade protection. APPLICATION The Belt Sway Switch is a critical safety component in modern conveying systems. It is extensively used for monitoring belt alignment in conveyor systems across industries such as coal, cement, mining, power generation, chemicals etc. Designed to detect lateral movement or sway of the conveyor belt, this switch provides early warning and initiates corrective action by triggering an alarm or shutting down the conveyor. This helps prevent damage to the belt, reduce material spillage, and avoid costly downtime due to belt misalignment. Typical causes of belt sway—such as uneven material loading, misaligned pulleys, or worn-out idler bearings—are quickly detected by the switch, ensuring smooth and safe operation. CONSTRUCTION As these switches are used as safety or emergency switch, it is not operated very frequently therefore construction of these switches is such that it should be operated immediately though it kept idle for long time. RRE Belt Sway Switch is housed in dust and weatherproof D.M.C (Dough Moulding Compound) enclosure having IP 65 grade of protection. The contact roller is supported on Delrin Moulded Bearings or Ball Bearing having high retentivity of lubricants and lowest coefficient of friction for smooth operation of roller over long period of time. The roller mechanism is self- reset type. Contacts are rated for 16 Amps at 440 Volts AC. OPERATION As the conveyor belt runs, it may deviate from its path due to uneven loading, worn idlers, or other factors. The misaligned belt comes into contact with the tilted roller lever of the Belt Sway Switch, initiating the following actions꞉ Step 1 – Alarm (20° angle) ꞉ When the belt pushes the roller lever to an angle of 20°, the first switch is activated, triggering an alarm signal. This indicates that the belt is running but requires inspection or adjustment. Step 2 – Fault (30° angle) ꞉ If the belt sway increases and pushes the lever further to 30°, the second switch is triggered, sending a signal to stop the conveyor, preventing potential damage or hazard. The switch is self-resetting꞉ once the belt realigns and departs from the roller lever, the mechanism automatically resets. The lever can tolerate a maximum deflection angle of 100°, ensuring protection under severe sway conditions.

Material : DMC (Dough Mould Compound)

Color : Black

Condition : New

Power Source : Potential Free Contacts

Application : Industrial, Conveyor

Feature : Rust Proof, Long Life, Good Quality, Easy To Use, Durable, Corrosion Ressistant

Voltage : Upto 440 VAC

Type : Belt Sway Switch

Frequency : 50-60 Hz

Country of Origin : India

Current : Upto 16 Amps

Warranty : 1 Year

Brand : R R ENGINEERS

Brand : R R ENGINEERS