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Low Voltage Rail Transfer Cart | 5–300 Ton KPD Transfer Cart

RMK KPD low voltage rail transfer carts are designed for heavy-duty material handling along fixed rail routes. The cart receives power from a 36V low-voltage rail system, eliminating the need for trailing cables or battery charging during operation.
With load capacities from 5 to 300 tons, the transfer cart can be customized with different platform sizes, rail gauges, travel speeds, control systems and load-handling fixtures to match specific factory conditions.

Load Capacity	15 Tons.
Power type	Low voltage rail.
Application	Steel coils, steel billets, silicon ingots, molten aluminum ladles, large cylindrical molds, pressure vessels, and more.
Add-on	Customized circular recessed work station.

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★★★★★ Trusted by Global Clients ISO 9001:2015 CE Marking

Low Voltage Rail Transfer Cart | 5–300 Ton KPD Transfer Cart

Load Capacity	15 Tons.
Power type	Low voltage rail.
Application	Steel coils, steel billets, silicon ingots, molten aluminum ladles, large cylindrical molds, pressure vessels, and more.
Add-on	Customized circular recessed work station.

REQUEST A FREE QUOTE

What Is a Low Voltage Rail Transfer Cart?

A low voltage transfer cart is an electrically powered material handling vehicle that receives power through conductive rails installed along its running track.
The KPD system typically reduces the workshop’s 380V AC power supply to 36V through a step-down transformer. The low-voltage power is then supplied to the rails and collected by a power pickup device on the transfer cart. The onboard electrical system provides power to the drive motor and controls the cart’s starting, stopping, forward and reverse movement.
Unlike battery-powered transfer carts, the KPD system does not require battery charging. Unlike cable reel carts, it does not drag a power cable behind the vehicle.
This makes it particularly suitable for fixed routes, high-frequency material handling and long-duration operation in industrial workshops. Similar KPD systems in the industry use the same 36V rail-powered principle.

How Does a Low Voltage Rail Transfer Cart Work?

The Low Voltage rail transfer Cart operates fully automatically by drawing power from low-voltage electrified rails, featuring a straightforward working mechanism and outstanding durability.
380V industrial power supplied to the workshop is first stepped down to safe 36V low voltage via an on-ground isolation transformer and transmitted to insulated rails. The cart obtains power through conductive wheels mounted on its base that make contact with the rails. An on-board electrical system then boosts the voltage to drive the travel motors.
Operators control start/stop, forward/reverse movement and speed adjustment via a pendant controller or wireless remote control. Power is supplied entirely through low-voltage rails without trailing cables. The cart enables stable cyclic transportation along fixed workshop routes, delivering superior safety and continuous operation performance.

Why Choose a Low Voltage Rail Transfer Cart?

Low Voltage Rail Transfer Cart is an ideal solution for heavy-duty material handling within industrial facilities. Powered by a continuous 36V rail power supply system, it combines outstanding safety, high load capacity, continuous operation capability, and cost-effective performance. It is widely used for heavy workpiece transportation in heavy manufacturing workshops. Its key advantages include:

Continuous Power Supply for 24/7 Operation

Continuous power is supplied through low-voltage rails, eliminating the need for battery charging or replacement and preventing downtime caused by low battery levels. This makes the transfer cart suitable for long-duration, high-frequency continuous transport operations.

36V Low-Voltage Power Supply for Enhanced Electrical Safety

The 380V power supply is converted to 36V low-voltage and supplied to the transfer through insulated rails, with leakage protection and grounding protection to reduce the risk of electric shock and improve safety in environments.

Cable-Free Operation for Reduced Site Interference

With rail power supply, no trailing cable or cable reel is required, reducing cable wear, maintenance requirements, and interference with personnel or other equipment, while ensuring cleaner and more stable transfer cart operation.

Heavy-Duty Load Capacity, Customizable to 300 Tons and Beyond

Custom-designed based on the actual load distribution, wheel load, rail type, platform dimensions, and operating conditions to meet the transport requirements of large equipment, steel, molds, and other heavy materials.

Ideal for High-Frequency Transport on Fixed Routes

Operating along fixed rails, it is suitable for transport within production lines, workshops, and between workshops, especially for applications requiring high frequency, long hours, and continuous operation.

KPD Low Voltage Rail Transfer Cart Technical Specifications

Technical Parameters Table Of KPD Low Voltage Electric Rail Transfer Cart
Rated Load Capacity（t）		5	10		15		20	30		40			50			60		80		100			150		200
Table Size(mm)	Length	2000	2400		3000		3000	4000		4500			5000			5000		6000		6000			7000		8000
	Width	1300	1500		2000		2000	2200		2200			2500			2500		2500		2500			3000		3000
	Height	450	500		550		550	600		600			700			700		800		800			900		900
Ground Clearance（mm））		≥50
Wheelbase（mm）		1300		1600		2000	2000		2700		3000			3300			3300	4000			4000			4800	5500
Rail Inner Distance（mm）		900		1100		1435	1435		1435		1435			1650			1650	1650			1650			2000	2000
Operation Method		Remote Control & Hand Operate Pendant
Move Way		Forward/backwards, Turning (Customized), Vertical-Horizontal Crisscross Movement (Customized)
Running Speed（m/min））		25					20
Motor Power（kW）		1.1	1.5		2×1.1		2×1.1	2×1.5		2×2.2		2×2.2			2×3			2×3	2×4			2×5.5			2×7.5
Motor Type		Three-Phase Asynchronous Motor
Brake Mode		Electromagnetic Brake
Protective Measures		Audible and visual alarm lamp+ Emergency stop button+Limit switch+Laser obstacle avoidance sensor(Optional)+Anti-collision contact edge(Optional)
Wheel Quantity		4																							8
Wheel Material		ZG55
Drive Wheel Diameter（mm）		Ф300	Ф300		Ф350		Ф350	Ф400		Ф400		Ф500			Ф500			Ф600	Ф600Heavy Duty Wheel			Ф700Heavy Duty Wheel			Ф600Heavy Duty Wheel
Recommended Rail Type		P15	P18		P24		P24	P38		P38		P43			P43			QU70	QU70			QU100			QU100
Power Supply Mode		Step Down 380V To 36V, And Step Up 36V To 220V								Step Down 380V To 36V And Step Up 36V To 380V
Rail Quantity		2								2+1 Conductive Rails
Transformer Power（kVA）		3	3		6		6	6		10		10			10			10	20			20			30
Working Environment		Temperature: -10°c～40°c; Humidity: 20%～80%, No Condensation(Customized for high-temperature and explosion-proof environments)
Vehicle Body Color		Customized
Other Functions		Over Voltage, Under Voltage, Over Current Protection etc
Versione Automatica – RGV		Combined With An Automatic Positioning System, Signal Reception System, And Programmable System, The Rgv Realizes Automated Handling Functions. Customizable Rgv Carts Such As Mother-Child Carts (Ferry Carts), Vertical-Horizontal Moving Carts, And Curved Track Carts Can Be Provided.

When Is a Low Voltage Rail Transfer Cart Suitable?

If your material handling operation has the following characteristics, a low voltage rail transfer cart is an ideal choice.

Fixed Transport Routes

The transfer cart runs along fixed rails between two or more workstations.

High-Frequency Operation:

Suitable for applications where the same transport task must be repeated multiple times during each shift.

Long-Duration Continuous Operation:

The rail power supply system supports continuous operation without downtime for battery charging.

Heavy-Duty Transport:

Can be designed for large and heavy workpieces that are difficult to move with forklifts or conventional material handling equipment.

Defined Production Processes:

KPD series transfer carts can be integrated into production lines to transport materials between machining, assembly, welding, storage, and testing areas.

When Is a Low Voltage Rail Transfer Cart Not Suitable?

To assist customers with accurate model selection and avoid operational issues, the key application limitations of Low Voltage rail transfer Car are specified below:

Travel Distance Limitation

Voltage drop will occur during long-distance transportation. Supplementary copper busbars for voltage compensation or additional supporting transformers must be installed to guarantee stable equipment operation.

Power Supply Mode Limitation

Power supply solutions are clearly classified by load capacity. Heavy-duty models over 50 tons use three-phase low-voltage power supply, light-duty variants suit single-phase low-voltage power supply.

Rail Installation Limitation

The cart draws power from insulated rails. Proper insulation treatment and earthing protection are mandatory during rail laying; otherwise, safe and normal operation cannot be achieved.

Travel Route Limitation

The cart is only applicable for fixed straight tracks or fixed loop tracks. It does not support complex operating conditions involving crossed tracks or frequent turnout switching.

Low Voltage vs Battery vs Cable Reel

Comparison Item	Low Voltage rail transfer Cart	Battery powered transfer cart	KPJ Cable Drum Transfer Cart
Power Supply Mode	Continuous power supply via 36V safe low-voltage rails	On-board battery power supply	380V power supplied via trailing cable reel
Continuous Operation Capacity	Capable of 24-hour non-stop operation with no endurance limits, ideal for cyclic assembly line transportation	Must stop for charging after operating for a period, disrupting production schedules	Continuous operation available; travel distance limited by cable length
On-site Cleanliness & Safety	No exposed cables to avoid cable crushing or pulling. 36V low voltage minimizes electric shock risks	No external cables, maintaining a tidy site	Trailing cables on the ground are prone to crushing damage and trip hazards, creating safety risks
Applicable Travel Distance	Suitable for long-distance and cross-workshop rail transportation	Works for both short and long distances, unrestricted by rail routes	Suitable for short-distance transfer. Longer travel distances lead to higher cable power loss and failure rates
Site Modification Requirements	Insulated rails need to be laid with one-time civil construction	No powered rail modifications required; flexible deployment	Ordinary rails are sufficient; rail insulation treatment is unnecessary
Long-Term Operating Cost	No battery replacement fees; stable energy consumption. Only routine mechanical maintenance required	Batteries require full replacement every 3–5 years, leading to high long-term consumable costs	Cables wear out from long-term friction and require periodic replacement
Workpiece Adaptation Advantages	Supports extensive platform customization (circular grooves, V-shaped supports, lifting platforms, etc.). The top choice for heavy cylindrical workpieces	Customizable platform available; not ideal for long-duration heavy-load operation	Customizable platform available; frequent heavy-load long-distance use is not recommended
Typical Application Scenarios	Pressure vessel factories, head processing, heavy industry workshops, mass non-stop assembly line transportation	Scattered workstations, locations where insulated rails cannot be installed, short-distance intermittent transport	Short-distance fixed-point transfer inside workshops, basic applications with limited budgets

Many customers struggle to choose the appropriate power supply solution when purchasing heavy-duty rail transfer carts.
If your facility requires round-the-clock continuous production, handles heavy workpieces, involves long transport routes, and maintains high standards for workshop safety compliance, the Low Voltage rail transfer Cart is the preferred option.
For frequent transportation of heavy items such as cylindrical shells and annular castings, the cable-free design effectively prevents production downtime caused by cable failures. Paired with a custom recessed platform, it delivers superior transport stability.
Battery-powered electric transfer carts are recommended for intermittent operation or sites where civil works for insulated rail installation cannot be carried out.
Cable reel transfer carts are a viable choice for short-distance fixed-point handling within workshops with budget constraints.

Low Voltage Electric Transfer Cart Applications

Benefiting from 24-hour continuous operation capability, cable-free structure and safe low-voltage power supply, Low Voltage rail transfer Carts are suitable for high-frequency transportation of heavy workpieces along fixed rail routes within factories, and ideal for non-stop assembly line production.

Pressure Vessel & Tank Manufacturing Industry

Designed specifically for vertical cylindrical tanks, pressure vessel shells and cylindrical blanks.
The cart’s middle circular recess secures cylinder bases for reliable positioning. It eliminates rolling, shifting and collision risks when transporting vertical cylindrical workpieces and ensures smooth transit.

Circulation of Small Empty Ladles and Cylindrical Components

Suitable for transporting cooled small empty ladles; not applicable for operations containing molten high-temperature steel.
It also handles machined cylindrical blanks and large circular sleeve workpieces. The recessed platform delivers stable positioning, perfect for high-frequency cyclic transportation along fixed workshop tracks.

Transportation of Circular Components for Wind Power and Heavy Industry

Suitable for vertical wind turbine tower sections, heavy cylindrical bases and flanged cylinder assemblies in wind power industry. Cylindrical workpieces easily slip and roll in transit. The trolley’s central circular recess offers bottom restraint to secure loads, enabling stable, deviation-free transport for continuous heavy workshop production lines.

Application Scenarios of Low Voltage rail transfer Carts

Pressure Vessel & Tank Manufacturing Industry

Circulation of Small Empty Ladles and Cylindrical Components

Suitable for transporting cooled small empty ladles; not applicable for operations containing molten high-temperature steel.
It also handles machined cylindrical blanks and large circular sleeves. The recessed platform delivers stable positioning, ideal for cyclic transport along fixed workshop tracks.

Circular Component Transport for Wind & Heavy Industry

Suitable for vertical wind turbine tower sections, heavy cylindrical bases and flanged cylinder assemblies in wind power industry. Cylindrical workpieces slip and roll in transit. The trolley’s central recess offers bottom restraint to secure loads, enabling stable, deviation-free transport for heavy workshop production lines.

Working Condition Selection Reference

Operating conditions where Low Voltage rail transfer Cart are preferred:

Insulated rails can be installed in the workshop with fixed transportation routes.
2-shift or 24-hour non-stop continuous transfer is required.
Heavy workpieces (5 tons – 300 tons) need frequent back-and-forth transportation.
The factory implements standardized safety management, and trailing cables on the ground are prohibited.
Enclosed indoor workshops with strict requirements for site tidiness and operational safety.

Customization Advantages from the Manufacturer

We offer non-standard customization for this Low Voltage rail transfer Cart with a circular recessed platform. Modifications can be tailored according to customers’ workpiece dimensions and production procedures. Instead of generic standardized equipment, our carts are built to match the actual transportation requirements of each workshop.

Customizable Recess Dimensions

No fixed standard recess is adopted. Recess depth and curvature are engineered on-site based on customers’ cylindrical workpiece diameter and dead weight. This achieves tight fitting, eliminating shaking and loosening in transit for superior positioning performance.

Optional Anti-slip Structures

To address minor sliding risks of vertical cylindrical workpieces, anti-slip plates and positioning stoppers can be installed upon request. These fixtures firmly secure loads to prevent shifting and collisions, maximizing workpiece integrity and operational safety.

Flexible Optional Auxiliary Tooling

Hydraulic lifts and rotating platforms can be fitted to match production workflows. The cart supports processes including cylinder fitting, joint assembly and non-destructive testing. One unit meets transport demands across multiple procedures for greater versatility.

FAQ

A low voltage rail transfer cart is an electric material handling vehicle powered through low-voltage conductive rails. The KPD system commonly reduces 380V AC power to 36V before supplying power to the rails.

The 36V rail system provides a lower-voltage power source for the transfer cart while maintaining the electrical power required for heavy-duty movement. The rail system must still be properly insulated and installed according to electrical safety requirements.

No. Power is supplied through the conductive rails, eliminating the need for a trailing cable or cable reel.

RMK can design low voltage rail transfer carts for different load requirements. Standard project configurations can range from approximately 5 to 300 tons, with higher capacities available through customized engineering.

Yes, depending on the selected KPD configuration and track design. Curved or S-shaped routes should be confirmed during the engineering stage because the track geometry, wheel arrangement and power supply system affect the final design. Industry KPD configurations are available for curved and S-shaped tracks.

The workshop power supply is reduced to low voltage through a step-down transformer. A current collector on the cart receives power from the conductive rails and supplies it to the onboard electrical system and drive motor.

No. The KPD transfer cart receives its operating power from the low-voltage rail system, so a traction battery is not required.

Yes. Because the cart is powered continuously through the rails, it is suitable for high-frequency and long-duration operation without battery charging downtime.

Yes. The platform length, width, height and load-support structure can be customized according to the workpiece dimensions and workshop layout.

Choose a low voltage rail transfer cart when the route is fixed and the cart operates frequently for long periods. A battery transfer cart is generally more suitable when the route changes frequently or greater movement flexibility is required.