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How BLE Relay Works: A Simple Guide for Vehicle Control

Bluetooth Low Energy (BLE) Wireless control modules have become an important part of telematics and IoT deployments. Among them, BLE relays offer a clean and efficient way to manage power circuits, ignition lines, and access mechanisms without installing long control cables or opening vehicle harnesses.

This article explains how BLE relay works technically and how TOPFLYtech’ s TSR1-B and T-Relay support different operational needs.

1. What a BLE Relay Actually Does

A BLE relay receives wireless commands through Bluetooth Low Energy and switches an electrical circuit ON or OFF.
The command comes from a GPS tracker or hub installed nearby.
The relay then controls whatever circuit it is wired to: ignition, fuel pump, refrigeration unit, auxiliary power, or door actuator.

The goal is simple: remote circuit control with minimal wiring.

2. How BLE Relay Works on Communication

A BLE relay workflow contains three functional steps:

Step 1 — Command Input

A platform, app, or automated rule generates a control instruction.

Step 2 — Tracker Transmission

A TOPFLYtech tracker receives the instruction and sends an encrypted BLE command to the relay.
BLE provides short-range, low-power transmission that stays stable inside a vehicle or trailer.

Step 3 — Circuit Switching

TSR1-B or T-Relay changes the output state (NO/NC), activating or deactivating the target circuit.
The tracker then reports updated status to the platform.

3. Why Fleets Use BLE Relays

BLE relays simplify installation and daily operation. Compared with traditional wired relays, they offer:

shorter installation time
reduced wiring workload
cleaner circuit layout
easier concealment for anti-tampering
stable communication within vehicle range
flexible placement inside cabins, trailers, or compartments

4. Where BLE Relays Are Commonly Used

BLE relay control supports a range of operational tasks:

vehicle immobilization
fuel pump or ignition cut-off
power management for auxiliary systems
door control for vans, trailers, and containers
refrigeration or equipment activation
asset access authorization for logistics or leasing companies

5. TSR1-B and T-Relay: Two BLE Relays with Different Strengths

TOPFLYtech provides two BLE relay modules.
They share the same BLE communication approach but are designed for different environments.

TSR1-B — Compact BLE Relay for Standard Vehicle Control

Suitable for: immobilization, fuel pump control, light-to-medium load circuits
Voltage: 7–32V

Key characteristics:

compact size for hidden installation
simple wiring
efficient for ignition or basic circuit control
ideal for rental fleets, corporate vehicles, or light logistics applications

TSR1-B is the practical choice when the target circuit does not require high current.

Watch this video to understand more.

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T-Relay — High-Power BLE Relay with Extended Capability

Suitable for: high-load circuits, harsh environments, door control
Voltage: 7–60V
Load: NO 60A / NC 50A
Protection: IP67

Key characteristics:

supports higher current applications
robust housing for environments with vibration, dust, or moisture
compatible with high-demand systems
reliable for door lock control on trailers, containers, and vehicles

T-Relay is designed for situations where stability and electrical endurance are essential.

6. Door Control with T-Relay

Door control is one of the most widely adopted applications. T-Relay connects directly to an electric lock or actuator.

How it works:

A control command is triggered from the platform.
The tracker transmits BLE instructions.
T-Relay switches its output state.
The door unlocks or locks accordingly.
The tracker reports the updated status.

The short communication range of BLE is an advantage here, improving security and reducing external interference.

Typical use cases include:

delivery vans
semi-trailers and box trailers
cargo compartments
smart containers
rental and shared vehicles

7. Integration with TOPFLYtech Trackers

Both TSR1-B and T-Relay pair easily with TOPFLYtech trackers. This module creates a fleet & car rental structure:

GPS + telematics data
BLE sensors
BLE relay control
cloud platform automation

Fleets can enable immobilization, door access, refrigeration control, or equipment activation with the same hardware ecosystem.

In the End

Then you’ll know how BLE relay works. It provides a clean and efficient way to control circuits in vehicles and assets.
They reduce installation effort, improve system flexibility, and support a wide range of fleet operations.

TOPFLYtech’s TSR1-B offers a compact relay solution for standard vehicle circuits.
T-Relay delivers higher electrical performance and environmental durability, making it suitable for heavy-duty or access-control scenarios.

They form a reliable wireless control toolkit that integrates naturally with modern IoT and telematics deployments.t supports a wide range of operational needs.

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