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Gantry Cranes

We are dedicated to providing gantry cranes solutions for a variety of industrial applications. Our gantry cranes come in various types, capacities and sizes to suit varied needs of customers, including single girder cranes, double girder cranes, semi-gantry cranes, portable gantry cranes, rubber tyred gantry cranes and more.

Each equipment is specifically designed and constructed to increase your work efficiency and safety. We not only design and manufacture gantry lifting equipment, but provide a comprehensive after-sales service to our clients to make sure their cranes run smoothly. Interested in Aicrane gantry cranes? Read on to find out how we provide gantry crane solutions for our clients and how we add value to your business!

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For Different Industries, Different Gantry Crane Solutions For You!

At Aicrane, you can easily find gantry crane solutions for various applications. We can also provide custom gantry crane solutions for your specific industrial applications. Here we list several common industrial applications, including but not limited to: manufacturing, construction, railway, shipyard, port, precast concrete, papermaking, etc.

Different Industrial Applications

60 Ton Gantry Crane in Railway

For Container Handling In Railway

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10 Ton Gantry Crane in Precast Concrete Yard

In Precast Concrete Yard

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Rubber Tyred Gantry Crane for Construction Project

For Construction Project

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Industrial Rubber Tyred Gantry Crane

For Industrial Application

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Different Gantry Crane Options!

For different applications, we have various types of gantry cranes for you to choose from: single girder gantry cranes, double girder gantry cranes, semi gantry cranes, rubber tyred gantry cranes, rail mounted gantry cranes, portable gantry cranes, etc. If you are not sure which type of gantry lifting equipment is best for your application, please feel free to contact Aicrane. Our crane engineers are here to recommend the most suitable gantry style crane for you!

Portable Gantry Crane
Portable Gantry Crane – Flexible & Cost-effective!

Portable gantry crane is a light and small lifting equipment that can be moved in all directions. This particular product provides a cost-effective and flexible lifting solution, and can be quickly disassembled and transferred to another site for use.

Applications: mold manufacturing, auto repair factories, construction sites, logistics, machining manufacturing, warehouses, etc.

Load capacity 0.5-10t
Span 2-16m
Lifting height 2-12m
Lifting speed 0.9-7.2m/min
Hoist running speed 11m/min
Crane running speed 6m/min or manual operation
Work duty A2

Case Studies – See How Our Gantry Cranes Can Serve You!

In this section, we would like to show you and introduce the various gantry crane solutions and services we have provided to our partner customers over the past few years. We are also looking forward to working with more global customers to provide professional material handling solutions and add value to their business! You can view some of our gantry crane cases below:
10 Ton Gantry Crane in Uzbekistan16 Ton Gantry Crane in Uzbekistan
  • 10 Ton Gantry Crane For Precast Concrete Yard in Uzbekistan

    We supplied several AQ-MH 10 ton gantry cranes to our Uzbekistan customer for handling precast concrete components in their precast concrete yard. During the installation, the Aicrane service team was on-site to guide the customer to install the crane. Aicrane office and service team in Uzbekistan can provide customers with local service and solve customer problems timely!

  • 16 Ton Gantry Crane For Factory in Uzbekistan

    European standard 16 ton gantry crane was installed in our customer’s factory in Uzbekistan. The customer will use the crane to lift and move various loads in his yard. The crane has variable frequency and high working level, which can better serve the customer’s lifting needs. In addition, in order to operate more efficiently and conveniently, the 16t gantry crane is equipped with pendant control + remote control.

/ 02

5 Ton Gantry Crane in UAE10 Ton Rubber Tyred Gantry Crane to UAE
  • 5 Ton Gantry Crane For Warehouse in UAE

    We supply a 5 ton double girder gantry crane for UAE customer’s warehouse. The 5 ton gantry crane is used to lift and stack boxes in the warehouse. According to the customer’s requirements and facility conditions, we recommended this 5 ton double girder gantry crane with electric hoist, a cost-effective option for warehouse.

  • Nuclear Power Plant 10T Rubber Tyred Gantry Crane to UAE

    10 ton electric rubber tyred gantry crane for nuclear power plant will be shipped to UAE. The client company is responsible for the operation and maintenance of Units 1-4 of the United Arab Emirates’s first nuclear power station and requires a 10 ton rubber tyred gantry crane for indoor maintenance of valves.

/ 02

60 Ton Gantry Crane in Chile
  • 60 Ton Overhead Crane For Railway in Chile

    Two 60-ton European standard double girder gantry cranes for railway were installed in Chile. These gantry cranes are used for container handling. Compared to dedicated container rail mounted gantry cranes, this double girder gantry crane solution for railway is very cost-effective and also efficient.

/ 01

70 Ton Gantry Crane in Argentina
  • 70 Ton Gantry Cranes For Lifting Concrete Box Girders in Argentina

    Two 70-ton double girder gantry cranes for lifting concrete box girder were installed in Argentina. This project is to make concrete box girders for bridge construction, so the client requires two gantry cranes to lift the box girders. According to the client’s project requirements and budget, we recommended our AQ-MG 70 ton double girder gantry crane for the client.

/ 01

5 Ton Gantry Crane in Thailand
  • 5 Ton Grab Gantry Crane For Handling Bulk Materials in Thailand

    A 5-ton double-girder grab gantry crane was installed in Thailand for handling bulk materials. The grab gantry crane is equipped with two-rope mechanical grab, which is easy to operate, has high productivity and is widely used.

/ 01

32 Ton Gantry Crane to Kazakhstan
  • Delivery of 32 Ton Gantry Crane For Container Yard to Kazakhstan

    A 32 ton gantry crane for container yard was delivered to Kazakhstan. The gantry crane will be used to lift containers in the yard. When communicating with the customer, the customer was very satisfied with the container handling and lifting solutions we provide, and they were also satisfied with the quality of our products and the timeliness of our services.

/ 01

10 Ton Gantry Cranes in Ethiopia
  • Ethiopia 10 Ton Gantry Cranes For Machine Shop

    Two 10-ton European standard single girder gantry cranes were installed in the machine shop of the Ethiopian customer. These gantry cranes are used to lift mechanical parts and components in the workshop.

/ 01

Buyer Guide for Gantry Cranes

To guide you in making the most beneficial and cost-effective choice for your business and application, here we briefly clarify the different things you need to consider before making your final decision. We summarize 6 main questions about gantry cranes. To narrow down your model options, it’s a good idea to think carefully about your answers to the following six questions:

  • 1. What is your gantry crane application? – The application of your gantry crane will determine which type and model of gantry crane is suitable for your application.
  • 2. How heavy a load do you want to lift? – The weight of the load you want to lift will determine the maximum lifting capacity of the crane model you can choose from.
  • 3. What is the span of the crane? – The span or width of the gantry crane system is critical in determining the size of the crane required.
  • 4. What is the max. lifting height of the crane? – Make sure the gantry crane will be the right size for loading and unloading materials.
  • 5. How many meters will the crane travel? – Do you need the rails from the gantry crane manufacturer?
  • 6. How many hours does the crane work per day and how many times per hour? – Determine the working level of your gantry crane.

Want to Learn More? Watch Videos!

Aicrane team has shot and produced many useful gantry crane videos to help our users have a better understanding of how the gantry crane work, what the structure is, how to install it, how we help customers around the world and more. If you are interested, watch the videos below!

How Do We Serve Customers?

One-stop Service & Customized Service
From consultation, solution design, processing and manufacturing to delivery and installation of gantry cranes, Aicrane provides one-stop solutions, saving customers time and effort. According to the special needs of customers, we can also provide customized solutions.
After-sales Guarantee
According to customer requirements, we support online or on-site installation guidance. Our online customer service will respond to customers in a timely manner and solve problems for them. We also provide relevant documents (operation manual, maintenance manual), online training, regular telephone return visits and other services.
One-to-one Service
We are always customer-centric, accurately meet customer needs, be responsible for customers throughout the process, and add value to customers’ business!
Overseas Offices
So far, we have set up overseas branches or offices in Pakistan, Uzbekistan, the Philippines, Indonesia, Malaysia and other countries to provide customers with convenient services.

Welcome to Visit Aicrane Factory!

Aicrane is a reliable gantry crane manufacturer and supplier in China, integrating crane design, manufacturing, sales, installation and service. We are committed to providing the most scientific comprehensive lifting solution, tailor-made reasonable configuration to meet customer needs for equipment. We have strict quality control system to ensure product quality, and also provide comprehensive after-sales service to ensure the safe, stable and reliable operation of each crane. Feel free to visit Aicrane factory and discuss how we can help you and add value to your business!

Aerial View of The Aicrane Factory
Aerial View of The Aicrane Factory

The Aicrane factory covers an area of ​​850,000 square meters, and the production license covers all kinds of cranes, hoists, steel structures and winches, etc.

Inside The Production Workshop
Inside The Production Workshop

We have advanced processing and production equipment, lean management mode and strict quality control system to ensure to provide customers with high-quality crane

Aicrane Production Workers
Professional Production Workers

Aicrane production workers have received strict training, work conscientiously and responsibly, and jointly provide customers with high-quality crane products!

FAQs About Gantry Cranes

What Are The Gantry Crane Specifications?

Single girder gantry cranes specifications

Technical Parameter of  AQ-MH Electric Hoist Single Girder Gantry Crane
Capacity t 3 5 10 16 20
Span S(m) 8~35 8~35 8~35 8~35 8~35
Lifting height m 6~18 6~18 6~18 6~18 6~18
Lifting speed m/min 8(0.8/8) 8(0.8/8) 7(0.7/7) 3.5(0.35/3.5) 3.3(0.33/3.3)
Trolley speed m/min 20(30) 20(30) 20(30) 18 14
Crane speed m/min 20(30) 20(30) 20(30) 20(30) 20(30)
Work duty A3~A4 A3~A4 A3~A4 A3~A4 A3~A4
Track type P24 P24 P30 P30  P38 P38 P38  P43

Technical Parameter of AQ-BMH Electric Hoist Semi Gantry Crane
Capacity t 3 5 10 16 20
Span S(m) 8~30 8~30 8~30 8~30 8~30
Lifting height m 6~18 6~18 6~18 6~18 6~18
Lifting speed m/min 8(0.8/8) 8(0.8/8) 7(0.7/7) 3.5(0.35/3.5) 3.3(0.33/3.3)
Trolley speed m/min 20(30) 20(30) 20(30) 18 14
Crane speed m/min 20(30) 20(30) 20(30) 20(30) 20(30)
Work duty A3~A4 A3~A4 A3~A4 A3~A4 A3~A4
Track type P24 P24 P30 P30  P38 P30  P38 P38  P43

Technical Parameter of  AQ-NMH European Electric Hoist Gantry Crane
Capacity t 3.2 5 10 16 20
Span S(m) 8~35 8~35 8~35 8~35 8~35
Lifting height m 6~12 6~12 6~12 6~12 6~12
Lifting speed m/min 0.8/5 0.8/5 0.8/5 0.66/4 0.66/4
Trolley speed m/min 2~20 2~20 2~20 2~20 2~20
Crane speed m/min 3~30 3~30 3~30 3~30 3~30
Work duty A5 A5 A5 A5 A5
Track type P24 P24 P30 P30  P38 P30  P38 P38  P43

Double girder gantry cranes specifications

Technical Parameter of  AQ-MG Double Girder Gantry Crane
Capacity t 5 10 16 20 32
Span S(m) 18~35 18~35 18~35 18~35 18~35
Lifting height m 6~18 6~18 6~18 6~18 6~18
Lifting speed m/min 11.5 8.5 7.9 7.2 6
Trolley speed m/min 37.2 37.4 40.1 40 37
Crane speed m/min 37.7 37.7 40.1 40.1 38
Work duty A3-A7 A3-A7 A3-A7 A3-A7 A3-A7
Track type P43 P43 P43 QU70 P43 QU70 P50 QU80
Capacity t 50 75 100 160 200
Span S(m) 18~35 18~35 18~35 18~35 18~35
Lifting height m 6~18 6~18 6~18 6~18 6~18
Lifting speed m/min 5.9 4.7 3.9 3.5 3.5
Trolley speed m/min 31.3 38.2 33.9 22.5 29
Crane speed m/min 44 38.3 32.3 28 28
Work duty A3-A7 A3-A7 A3-A7 A3-A7 A3-A7
Track type QU80 QU80 QU100 QU100 QU100
Capacity t 250 320 400 450 500
Span S(m) 18~35 18~35 18~35 18~35 18~35
Lifting height m 6~18 6~18 6~18 6~18 6~18
Lifting speed m/min 2.2 2.3 1.5 1.5 1.5
Trolley speed m/min 28 16.6 10 10 11.5
Crane speed m/min 50 28 18 18 16
Work duty A3-A7 A3-A7 A3-A7 A3-A7 A3-A7
Track type QU120 QU120 QU120 QU120 QU120

Technical Parameter of AQ-MDU Double Girder Gantry Crane
Capacity t 10 16 20 32 40 50
Span S(m) 18~35 18~35 18~35 18~35 18~35 18~35
Lifting height m 6~18 6~18 6~18 6~18 6~18 6~18
Lifting speed m/min 13.3 7.9 7.2 6 5.9 5.9
Trolley speed m/min 37.4 40.1 40 37 31.3 31.3
Crane speed m/min 41 40.1 44 40.1 40.1 40.1
Work duty A5-A6 A5-A6 A5-A6 A5-A6 A5-A6 A5-A6
Track type P43 P43  QU70 QU70 QU80 QU80 QU100

Technical Parameter of AQ-BMG Double Girder Semi Gantry Crane
Capacity t 5 10 16 20 32
Span S(m) 12~30 12~30 12~30 12~30 12~30
Lifting height m 6~12 6~12 6~12 6~12 6~12
Lifting speed m/min 11.5 8.5 7.9 7.2 6
Trolley speed m/min 37.2 37.4 40.1 40 37
Crane speed m/min 37.7 37.7 40.1 40.1 38
Work duty A3~A6 A3~A6 A3~A6 A3~A6 A3~A6
Track type P43 P43 P43 QU70 P43 QU70 P50 QU80

What Is The Purpose of Gantry Crane?

Gantry cranes are widely used to lift and move heavy objects in freight yards of mechanical processing plants, metallurgical plants, chemical plants, nuclear power plants, shipyards, railway, ports and docks.

What Is The Difference Between Gantry Crane And Overhead Crane?

The most common difference between the two is that for gantry cranes, the entire structure is directly mounted on the ground track, with legs and running mechanism connected under the main beam. While the overhead crane is installed on the elevated runway beams, which can make full use of the space under the crane.

Wanna know similarities and differences between gantry cranes and bridge cranes in specifications, structures, working environments, visit gantry crane vs. bridge crane.

Are Gantry Cranes Safe?

If installed, maintained and used properly, the gantry crane is very easy and safe to use. The crane has many safety device options to ensure safe operation:

  • Overload limiter
  • Lifting limit switch
  • Travel limit switch
  • Deflection adjustment and display device
  • Interlock protection device
  • Buffer
  • Rail clamp
  • Anti-tip safety hook
  • Rail end stop
  • Rain cover for electrical equipment
How Much Can A Gantry Crane Lift?

The maximum load capacity of gantry cranes can reach up to 500 tons, the maximum span up to 35m, and the lifting height up to 18m.

What Are The Main Parts of A Gantry Crane?


  • The design and manufacture of hooks are in compliance with the GB/T 10051-1988 standard.
  • The hook is a forged single hook, which is forged by DG20.
  • All hooks are equipped with hook closures to preventthe lifted loads from being unhooked.
  • The ratio of the diameter of the pulley to the diameter of the wire rope is greater than 20 to ensure the service life of the wire rope.
  • The pulleys are equipped with protective covers or devices to prevent the wire rope from jumping out of the groove.

Coupling And Drive Shaft

  • Using safe and reliable drum-shaped gear coupling to connect the transmission components of each mechanism, transmitting torque and compensating for the angular and radial deviation caused by a certain installation error at the same time, improving the dynamic characteristics of the transmission device.
  • The transmission shaft is made of 45# steel, and the strength calculation is strictly carried out to ensure itsstrength and stable torque transmission.

Drum Group

The drum device is mainly composed of drum gear ring, drum, intermediate shaft device, bearing base and limit guide rod device. Rope grooves are machined on the drum to make the wire ropes orderly arranged.

Wire Rope

The wire rope complies with the regulations in GB 8918-2006 “Wire Ropes for Important Uses”.

Wheel Set

  • The choice of wheel diameter and material is based on the maximum supporting force of the wheel under the most unfavourable conditions to ensure thatthe wheels will not be overloaded.
  • The wheel material adopts ZG340-640, and undergoes advanced power frequency heat treatment and quenching.
  • There must be no defectson the wheel tread and the inner surface of the wheel flange, and no welding repair is allowed.

Electric Motor

  • The insulation class of the motor is F, and the protection class is IP54/IP55.
  • The motor has the characteristics of reasonable structure, reliable performance, high quality, large overload capacity and high mechanical strength.


The reducer is a special reducer for cranes, which has high carrying capacity, high efficiency, low noise and low vibration.


The brake adopts YWZ series electro-hydraulic block brake, which is stable, safe and reliable.

Metal Structure Pretreatment and Coating

  • The steel material of the crane metal structure is often Q235B or Q345B carbon structural steel.
  • The steel used for crane metal structure should be subjected to surface shot blasting and rust removal.
  • The main welding method is automatic submerged arc welding, and the others are carbon dioxide gas shielded welding and AC welding.The main butt welds of structural parts must be 100% non-destructive inspection.
  • The surface of the crane should be painted before leaving the factory, and anti-rust measures should be taken for the exposed surface that is not painted. The primer used by our company is epoxy zinc-rich primer with strong corrosion resistance, stability and good adhesion, and the topcoat is a chlorinated glue topcoat with high corrosion resistance and strong adhesion. After painting, the crane has good gloss and beautiful appearance, which can greatly extend the service life of the equipment.
How Does A Gantry Crane Work?

Gantry cranes generally have three mechanisms: lifting mechanism, trolley running mechanism and crane running mechanism. Its working principle is as follows:

  1. In normal working procedures, first start the lifting mechanism for lifting action, the empty hook descends, and hoists the load to a certain height, and then start the trolley running mechanism and the crane running mechanism to the designated position.
  2. Start the lifting mechanism again to lower the items, and then the empty hook rises to a certain height, and the trolley runningmechanism and the crane running mechanism crane return to their original positions to prepare for the second hoisting work.
  3. Every time an item is hoisted, the above process is This process is usually called a cycle.In a cycle, the mechanisms do not work at the same time.
What Are The Design Standards Of Gantry Cranes?
  • GB / T 14406-1993 Universal Gantry Crane
  • GB / T3811-2008 Design specification
  • JT400-1999 Port Gantry Crane Safety Regulations
  • GB/T17495-1998 Port Gantry Cranes – Specifications
  • GB / T17496-1998 Technical Code for Repairing Port Gantry Crane
How to Install A Gantry Crane?

Tips for gantry crane installation:

  • Laying a cart rail (usually by the demand side ), but before installing the mobile gantry crane must be re-testing of the track, gauge error cannot exceed 10 mm.
  • Crane cart installation, to ensure the carts on both sides of the parallelism, verticality, you can pull line, pull the diagonal, all antonyms and other means to carry out correction.
  • Lifting the splicing good legs, connecting it with the cart, and the wind cable tension, the general one leg 4 cables, after loosening the hook (cable fixed legs will not dump down.
  • Lifting spliced good girders (girders have a piece or two, user requirements to be set) on both sides at the same time, on the erected legs.
How to Make Your Gantry Cranes More Efficient And Energy-saving?

How does the gantry crane make energy-saving emission reduction?

Gantry crane is the abbreviation of the portal crane, and energy-saving emission reduction is mainly in the crane selection and manufacturing phase, the selection of energy-saving effect of four-bar linkage gantry crane, motor selection of energy-saving motors and low resistance bearings, installation of high-efficiency frequency control system. In the operation can try to make the grab full, hook locks according to the choice of goods weight hanging crane lock. As far as possible in the production organization based on a single piece of groceries size and weight to arrange the appropriate berth and door machine operations.

What problems should pay attention to about the gantry cranes lubrication?

Lubrication did in order to ensure the normal operation of various parts of the crane and can extend the service life of the crane, at the same time, lubrication will affect the production efficiency and so on. Lubrication is a very important part of the crane’s routine maintenance. The crane lubrication is very important.
The material of lubrication must be clean, and lubricants of different brands cannot be mixed. In addition, the choice of lubricants above should be appropriate, according to the rules of regular lubrication. Always check the gland seal lubrication system.

In lubrication, to keep the power outage, so as to avoid accidents, of course, except for the lubrication of electric systems. Gantry crane lubrication, for moderately higher lubrication points, should increase the number of lubrication and installation of insulation or cooling device. Try to grease to the friction surface.

It also needs to pay attention to the sodium-based grease absorbent easy to failure, therefore, should not use this lubricant in wet areas.

Custom Gantry Crane Design
Gantry Crane Design
How to Ensure Gantry Cranes Safety?

In order to avoid unnecessary losses, the crane operator needs to pay special attention to safety issues when using lifting equipment.

For reasons of ambient safety, basic safety precautions should always be followed during installation and maintenance to prevent the risk of fire, electric shock, and personal injury. Including the following aspects:

  • Never install the device in an unknown liquid pipe to prevent accidental production.
  • Never install the power cord during a lightning storm.
  • Do not immerse the power supply in the water.
  • In any case, all matters related to product installation, modification, and maintenance, the power must be cut off before the completion of all work in order to power back.

In circumventing the relevant safety issues outside the environment. Lifting equipment installation precautions also do the following analysis:

  •  before the test should be checked in the case of cutting off all the power.
  •  brake operating mechanism, the adjustment should not be too loose or too tight, in order to prevent the car phenomenon and the impact of the phenomenon is appropriate.
  • Track alignment not only to track the vertical direction of the bend but also the school lateral bending because the lateral is not straight, the wheel will be stuck in the process of crane operation, so the lateral bending is the focus of alignment.
  •  Platen can be used on the 3rd ordinary carbon steel, welded according to the requirements of processing.
  • The joint position of two parallel rails should be staggered, and its offset distance should not be equal to the base distance of the front and rear wheels of the crane.
What Are 4 Common Problems With Gantry Cranes And How to Avoid Them?

Learn about some of the problems you may encounter during the operation of the gantry crane and what measures you can take to avoid them.

1. Wheel Gnawing on the Track

Wheel gnawing on the track means that the rim of the wheel is in serious conflict with the track, making noise or vibration during operation.

If the wheels of the crane always gnaw the rail in one direction, the horizontal deflection of the wheels (either the two driving wheels or the passive wheels) should be adjusted.

If the rail gnawing directions are opposite during the round trip, it is likely that the two motors or brakes are not synchronized.

If the rail is gnawed on a certain stroke, there may be deviations in the track installation.

If rail is always gnawed on the stroke, there is a problem with the track span.

2. Driving Wheel Skidding

If the driving wheel is slipping, check the wheel rolling surface to see if it is on a flat surface. If not, the angle bearing box should be padded and adjusted.

If there is oil on the track, fine sand can be sprinkled on the track surface to increase the coefficient of friction.

Also, you can adjust the braking torque to prevent excessive braking.

3. Safety Switch Failures

The failure of the safety switch is mainly caused by the sticking or displacement of the internal objects of the switch.

When adjusting and using it, pay attention to the following points:

  • The ascent limit safety switch should ensure that when the empty hook rises, its uppermost point is not less than 200mm away from the related objects of the trolley at the moment of power failure.
  • The safety switch should be re-adjusted every time the wire rope is replaced or connected.
  • The reliability of the switch should be checked every shift.

4. Issues With Electrification System

  • When the mainknife switch of the power distribution protection box is closed, the fuse of the control circuit fuse is blown, indicating that there is grounding or short-circuit phenomenon in the control circuit. It should be checked step by step and eliminated.
  • When the emergency switch is closed, the main contactor cannot be connected. The reasons may be that the main knife switch is not closed; the door is not closed; the controller is not in the zero position; there is no voltage on the line; the fuse of the control circuit is blown; the contactor coil is damaged.
  • When operating the controller, the motor does not run. The reasons may bethat the stator circuit is open; there is no voltage on the circuit; the brake is not opened; the contactor of the contactor is in poor contact; the rotor circuit is open; the slip wire is in poor contact with the collector.
  • The motor cannot deliver the rated torque and rotates slowly. The reasons may bethat the brake is not fully opened; the line voltage has dropped too much; the slip wire is in poor contact with the current collector; one phase of the stator and rotor wires is incorrectly connected.
  • After the limit switch is activated, the corresponding motor is continuously energized. The reason may bethat short circuit in the limit switch circuit or wiring errors in the limit switch circuit.
  • After the contactor coil is de-energized, the contactor does not release. The reasons may bethat there is a short circuit in the control circuit; the movable part is stuck; the contacts are welded.
  • Issues with the contactorand relay

Coil temperature is too high or the noise is strong. The reason may be that the coil is overloaded; the spring pressure of the moving contact is too large; the working surface of the magnetic conductor is dirty; the movable part of the magnetic conductor is stuck; the screw fixing the magnet is loose.

The contact is overheated, burnt or welded. The reason may be that the spring pressure or overtravel of the moving contact is too small; the contact is dirty, the surface is uneven, and the contact is not close, so a tiny arc is generated; the energization time of the coil is less than the inherent pull-in time of the contact, so the contact is not completely closed when the power is cut off, generating an arc; the movable part is stuck.

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