Power Relays

Power relays for tail gates and truck lift gates – Switching power meets precision

In professional transport operations, reliability, safety, and precise control matter in every situation. Whether loading and unloading heavy goods or operating continuously under changing conditions – Every tail gate and truck lift gate depends on perfectly coordinated electrics. This is where power relays play a central role. They are the unseen heroes of the control system and ensure that every electrical impulse is implemented precisely. Without them, even the most modern tail lift comes to a standstill. In this category, you will find power relays designed for the requirements of tail gate electrics and supporting reliable switching and control in daily operation. At SULEJ Ladebordwand, we know from years of experience: A reliable power relay determines operational safety, service life, and efficiency of the entire loading system.

The power relay – Switching center of every truck tail gate

Every tail gate works only through the interaction of mechanics, hydraulics, and electrics. While hydraulics and mechanics provide movement, power relays handle the precise control of these processes. In the tail gate sector, power relays are also referred to as starter relays or high-current relays depending on the manufacturer, because they switch the high-current circuit between the control unit/controller and the drive. As central switching units, they connect the control unit to the high-current circuit, switch electric motors on or off, and protect the electronics from voltage spikes.

Power relays stabilize current flow, protect the control system from voltage spikes, and enable smooth, controlled movement sequences of the truck lift gate. This keeps the lift gate reliable, precise, and efficient – Even under continuous load.

More than just a switch – The function of power relays in detail

A power relay is an electromagnetically controlled high-current switch. A weak control signal from the control unit activates a solenoid coil that generates a magnetic field. This pulls a contact and closes the high-current circuit – The motor of the tail gate receives power and can raise or lower. This indirect switching protects the sensitive control electronics from current peaks and ensures safe, controlled platform movements. This creates a durable, low-maintenance connection between the control unit, electric motor, and hydraulic power pack.

The right power relay for every application

Power relays (starter relays) differ by voltage (12 V or 24 V) and switching capacity (amperes). The correct choice depends on the tail lift type and the vehicle’s electrical equipment. A relay with insufficient capacity can overheat or fail, and the wrong voltage type can even destroy the electronics. That is why it is essential to follow the exact manufacturer specifications when selecting tail gate spare parts. Sealed relay housings provide additional protection against moisture, corrosion, and dirt – Ideal for daily use in transport operations.

Maintenance and care – For a longer service life of your lift gate

Even robust components like power relays benefit from regular maintenance. Check connections for corrosion, tight seating, and clean contact surfaces. A dry, protected installation location prevents leakage currents and short circuits. Delayed responses or irregular movements of the truck lift gate can indicate a worn relay. Timely replacement prevents consequential damage to the motor and control system and secures the long-term functionality of the entire system.

Quality that switches – What you should look for in power relays

Not every starter relay is the same. At SULEJ Ladebordwand, we rely on high-quality relays from well-known manufacturers such as Mahle, Albright, Trombetta, and Haldex Concentric. These components are characterized by high conductivity, precise switching operations, and robust construction. A durable housing protects the mechanics from vibration, moisture, and temperature fluctuations – Typical stresses in everyday transport operations. This quality ensures operational safety, efficiency, and longevity of the tail gate even under demanding conditions.

Advantages at a glance

• Reliable switching function for precise movements
• Protection of the control system from voltage spikes and overload
• Longer service life thanks to high-quality contacts and housings
• Compatible with 12 V and 24 V systems
• Lower maintenance effort and reduced downtime
• Resistance to moisture, dirt, and vibration

Common questions about power relays for tail gates and lift gates (FAQ)

How can I identify a faulty starter relay?

Typical signs include clicking noises without motor movement, delayed responses, or a complete failure of one movement direction (e.g., lifting works, lowering does not).

Can I replace a power relay myself?

Replacement is possible with basic electrical knowledge. Important: Disconnect the battery beforehand and install only a relay with identical specifications. If in doubt, the work should be carried out by qualified personnel.

Why are there different voltage versions (12 V / 24 V)?

The onboard voltage depends on the vehicle type: vans usually use 12 V, heavy trucks 24 V. The relay must always match the onboard voltage exactly.

What are the consequences of a relay with the wrong voltage or insufficient switching capacity?

Incorrect voltage can destroy the coil or the control electronics, and insufficient switching capacity leads to overheating and functional failure – In the worst case, even a fire hazard.

Where can I find the right power relay for my tail gate?

The correct relay depends on the manufacturer, voltage (12 V / 24 V), switching capacity, and design. The type plate can often be used to obtain technical drawings or parts lists that indicate the installed relay type. The correct mounting base is also important to integrate the relay securely into the existing system.