Power Relays

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

In professional transport operations, reliability, safety, and precise control are essential in every situation. Whether loading or unloading heavy goods or operating under changing conditions, every tail gate and lift gate depends on a perfectly tuned electrical system. This is where power relays take on a central role. They are the invisible heroes of control, ensuring that every electrical impulse is executed precisely. Without them, even the most advanced lift gate would come to a stop. At SULEJ Ladebordwand, we know from years of experience that a dependable relay determines operational safety, service life, and efficiency of the entire lifting system.

Starter relay – The control center of every truck tail gate

Every tail gate operates through the interaction of mechanics, hydraulics, and electronics. While the hydraulics and mechanics handle motion, the starter relay manages precise control of these processes. As a central switching unit, it connects the control panel with the high-current circuit, switching motors on or off while protecting sensitive electronics from voltage spikes.

The result: The starter relay ensures that mechanical, hydraulic, and electrical systems work together harmoniously. It stabilizes current flow, protects the control electronics, and enables smooth, controlled platform movement. This keeps the lift gate reliable, precise, and efficient – even under continuous operation.

More than just a switch – The role of magnetic switches and power relays in detail

A magnetic switch or power relay is an electromagnetically controlled high-current switch. A weak control signal from the operator panel activates a coil that generates a magnetic field. This magnetic field pulls a contact closed, completing the high-current circuit so the lift motor receives power to raise or lower the platform. This indirect switching method protects the sensitive control system from power surges and ensures safe, stable platform operation. It creates a durable, low-maintenance link between control unit, electric motor, and hydraulic system.

Choosing the right relay for your lift gate

Power relays and starter relays vary by voltage (12 V or 24 V) and switching capacity (amperes). The right choice depends on the type of lift gate and the vehicle’s electrical configuration. A relay with too low a capacity may overheat or fail, while an incorrect voltage rating can damage the electronics. Always follow the manufacturer’s specifications when selecting spare parts. Sealed relay housings offer extra protection against moisture, corrosion, and dust – ideal for daily transport use.

Maintenance and care – Extending the life of your tail gate

Even durable components like relays benefit from regular maintenance. Check connections for corrosion, tight fit, and clean contact surfaces. A dry, protected installation prevents leakage currents and short circuits. Delayed reactions or inconsistent movements of the lift gate may indicate a worn relay. Replacing it in time prevents damage to the motor and controller, ensuring long-term system reliability.

Quality that connects – What to look for in a starter relay

Not all starter relays are the same. At SULEJ Ladebordwand, we rely on high-quality components from manufacturers such as Mahle, Albright, Trombetta, and Haldex Concentric. These relays offer excellent conductivity, precise switching, and durable construction. Their sturdy housings protect internal parts from vibration, moisture, and temperature fluctuations – typical challenges in everyday transport. This ensures maximum safety, performance, and longevity for your lift gate, even in demanding environments.

Advantages of high-quality power relays at a glance

• Reliable switching for precise, smooth movements
• Protection of control electronics against overload and surges
• Extended service life through durable contacts and housings
• Compatible with 12 V and 24 V systems
• Lower maintenance and reduced downtime
• Resistant to moisture, dirt, and vibration

Frequently asked questions about magnetic switches, power relays, and starter relays (FAQ)

How can I tell if a starter relay is faulty?

Common signs include clicking sounds without motor movement, delayed response, or complete failure of one movement direction (e.g., lifting works but lowering doesn’t).

Can I replace a power relay myself?

If you have basic electrical knowledge, replacement is possible. Always disconnect the battery first and use only a relay with identical specifications. If unsure, have a professional handle the installation.

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

The vehicle type determines voltage: most vans use 12 V, while heavy trucks operate on 24 V. The relay must match the system voltage exactly to ensure safe operation.

What happens if the wrong relay or voltage is used?

Using a relay with the wrong voltage can destroy the coil or controller. Too little switching capacity may lead to overheating and failure – in the worst case, even fire hazards.

Where can I find the correct magnetic switch or power relay for my lift gate?

The correct relay depends on manufacturer, voltage (12 V / 24 V), switching capacity, and design. You can identify it by checking the type label or the existing relay. The correct mounting base ensures secure installation within your lift gate system.