Pulse relays

Pulse, bistable relays

Pulse relays, also known as bistable relays, are a type of relay that changes the state of the contact with each input pulse.

How it works

Pulse relays work on the principle of opening or closing the contacts depending on the current state of the relay using an electrical pulse.

Power supply for pulse relays

Pulse bistable relays operate as standard on 12 or 24 VDC or 230 VAC. Unlike other relays, they do not need constant power, but only during operation.

Pulse relays, after applying power, determine which position the relay is in and power the opposite coil. The contacts are transferred and hold this position when the power is turned off. When the power is turned on again, the contacts are transferred to the opposite state and hold this position.

Pulse relays are economical and suitable for applications such as turning on or off a single device from one or more places with a momentary switch or button. They are often used to control large circuits of lighting fixtures. They retain their last state even after the pulse disappears, making them independent of the power supply until they are turned on again.

Types of pulse relays

• electromechanical;
• electronic;

Electromechanical

Electromechanical relays have a coil and a mechanical mechanism for holding the state, often with a magnet or mechanical holder. When operating, they change the state back to the current one. They withstand greater loads and higher currents, but are slower and noisier. Suitable for more complex electrical systems with a higher load.

Electronic

Electronic pulse relays use transistors and microcontrollers to store the position and its value. They are much faster, but withstand a small load and are suitable for consumers with low current. They are intended for small and simple electrical systems mainly for lighting, control of smart systems in a "smart home", controlled via software and mobile devices.

Mounting

Pulse relays can be mounted in electrical panels using a DIN rail or be built into a console or concealed. They can be remote or via a button or electric switch.

One of the most functional and modern pulse relays currently available on the market are the relays from shelly. They are small and compact and can be installed almost anywhere, offer Wi-Fi access and are multifunctional when building a home Smart system for controlling lighting and other devices in the home.