Relay for tracker 24 Volt 5 contacts with terminal block

Why do you need a relay with a terminal block for a GPS tracker: Complete guide and connection rules

When it comes to advanced GPS monitoring functionality (e.g., remote engine locking or control of additional equipment), a tracker alone is not enough. Direct connection of power units to a GPS device can lead to its failure.

The solution is simple, but critically important — using a car relay. In this article, eQuGPS experts take a detailed look at why a relay is needed for a GPS tracker, how to read it correctly, and what to consider before installation.

Why do I need a relay for a GPS tracker?

Most modern GPS trackers are designed to collect data and transmit control signals , rather than directly powering power consumers (starter, fuel pump, etc.). The tracker outputs simply cannot withstand high current.

The relay acts as a safe intermediary: it allows a small control signal from the tracker to turn on or off a separate high-current electrical circuit. This ensures stable operation of the tracker's electronics and reliable execution of commands (for example, anti-theft locking circuits).

Typical work logic

1. The GPS tracker sends a low-current signal.

2. This signal is fed to the relay coil.

3. The relay operates and uses its powerful contacts to switch the desired circuit (closes or opens it).

How to read relay terminals to avoid confusion

To ensure that your self-installation or professional installation goes smoothly, it is important to understand the markings. The DIN 72552 standard is most often used in automotive relays:

• 85 and 86 — coil contacts (power and control minus/plus from the tracker are connected here).

• 30 — common (input) power contact.

• 87 (NO - Normally Open) — normally open contact (closes when a signal is applied to the coil).

• 87a (NC - Normally Closed) — normally closed contact (opens when a signal is applied).

When is a relay + terminal block kit the ideal solution?

Using a ready-made kit from eQuGPS provides several significant advantages when integrating a monitoring system into a car:

• Clean installation "without twists": The presence of a terminal block allows you to make connections reliable and safe, which is especially important in conditions of vehicle vibrations.

• Speed of maintenance: Thanks to the terminal block, you can quickly remove or reinstall the relay without having to cut wires.

• Electronics safety: Moving control of any actuator to a separate circuit completely removes the load from the GPS tracker outputs.

What to check before purchase and installation

To avoid errors and ensure perfect compatibility with the eQuGPS system, pay attention to 3 parameters:

1. On-board network voltage (12V or 24V): eQuGPS kits are universal or have appropriate markings, therefore they are suitable for both passenger cars (12V) and trucks (24V).

2. Tracker output type: Find out what your tracker drives (low-side / high-side / dry contact) and what its allowable control current is. Most trackers drive the negative (low-side).

3. Contact mode (NO or NC): Determine what logic you need. NC (normally closed relay) is most often used to block the engine so that if the tracker loses power, the car can drive. Make sure that the “on/off” logic in the eQuGPS application matches your task.

Ready-made solution from eQuGPS

Looking for a reliable component for your security system?

The Relay + Terminal Block Kit (Item 487, manufacturer eQuGPS) is an ideal intermediate power element between your GPS tracker and the vehicle's executive circuit (12/24V). The kit allows you to:

• Carefully connect the wiring through a convenient terminal block.

• Implement remote controlled on/off of individual circuits.

• Fully protect the tracker outputs from overloads.

  
  

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