Hot selling 1-channel relay module 12V low-level trigger relay expansion board

Product Features

1. This module complies with safety standards and has isolation slots between the control area and the load area;

2. Adopting double-sided FR-4 circuit board design and high-end surface mount technology production,

3. Adopting relay control;

4. Equipped with power and relay action indicators, it lights up when in and out, but does not light up when disconnected;

5. When there is a low-level signal at the signal input terminal, the common terminal and the normal terminal will conduct;

6. Relays can directly control various devices and loads

7. There is one normally open and one normally closed contact!

8. The blue KF301 terminal is more convenient for connecting control wires.

9. Module size: 43x17x18.5mm; Net weight: 15g

Electrical parameters

Instructions

1. Module power supply: The power supply should be DC, and the voltage should match the voltage of the relay

2. The common terminal of the relay, normally open or normally closed, is only a single pole double throw switch with wiring

The method is as follows:

Reference for common wiring methods:

Product Usage

The following content provides a detailed introduction to the principle and usage of relays, and is applicable to all relay wiring methods. Please read carefully before use to avoid connecting the wrong circuit.

Product Working principle

As long as a certain voltage is applied to both ends of the coil, a certain current will flow through the coil, generating electromagnetic effects. The armature will overcome the pulling force of the return spring and be attracted to the iron core by electromagnetic force, thereby driving the moving contact of the armature to engage with the stationary contact (normally open contact). When the coil is powered off, the electromagnetic attraction will also disappear, and the armature will return to its original position under the reaction force of the spring, releasing the moving contact and the original stationary contact (normally closed contact). This suction and release achieves the purpose of conduction and disconnection in the circuit. For the "normally open and normally closed" contacts of a relay, they can be distinguished as follows: the static contacts that are in a disconnected state when the relay coil is not energized are called "normally open contacts"; The static contact in the connected state is called a "normally closed contact" relay, which generally has two circuits: a low-voltage control circuit and a high-voltage working circuit.

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