DC signal relay

DC Signal Relays

China SPDT or DPDT signal relays, wholesale price for bulk orders, factory direct delivery. We produce signal relays with the aggressive price and reliable quality. ATO works closely with the customers all over the world and our signal relays provided are with good reputation. Meanwhile, ATO offers the optimal signal relay for every application area.

Request a DC signal relay quote from relay supplier today.
Get a Quote

15+
Years in Relay Manufacturing

4,000+
Square Feet Factory Size

6,000+
Relays Produced Each Month

Signal Relays

Signal relay from Chinese manufacturer is a kind of common device in automatic control system, which are widely used for switch, anti-theft monitoring, communication equipment, office equipment, medical equipment and security alarm system. ATO manufactures 3V, 5V, 6V, 12V, 24V DC low signal relays at factory price, contact form DPDT/ SPDT available, small and compact. By designing and making its customization fully automatic production equipment to fulfill your needs, and hence to produce high efficiency and low power consumption protection relays.

SPDT DC Signal Relay

SPDT DC Signal Relay

ATO SPDT DC signal relays are available 9V, 12V, 24V DC coil voltage, optional coil nominal power 360mW, 200mW, 450mW, contact form SPDT (1C), 3A contact switching capability, rated load 1A 240VAC/30VDC, 3A 120VAC.
Read More
DPDT DC Signal Relay

DPDT DC Signal Relay

Miniature low signal relays are commonly used devices in automatic control systems. They are used to connect and disconnect circuits, to issue control commands and to reflect equipment status to form automatic control and remote control circuits.
Read More
Signal relay factory

Chinese Well-known Signal Relay Manufacturer

ATO has been constantly innovating the process and improving the layout. As a Chinese supplier, our company has been engaged in the production, R&D and sales of signal relays for more than 15 years. 10 years ago, the company established two strategic development directions, one is to take relays as the main product, the other is to export-oriented development, and the management policy is "quality wins".

We also manufacture and develop other relay products, such as solid state relays, time relays, electromagnetic relays, etc. The development model has changed from a single product to a multi-category product development.

Automatic production line

Relay Industry Chain

As far as the relay industry chain as a whole is concerned, the upstream is mainly the production materials and production equipment of relays, of which raw materials are the main cost, and labor and manufacturing costs are about a quarter. The midstream is mainly the production and manufacture of relays, of which ATO is the Chinese supplier, and the downstream mainly includes automobiles, home appliances, communications, electricity meters and new energy.

Factory technology innovation

Challenge and Innovation

With the enthusiastic in invention and expertise in signal relay manufacturing, our R&D engineers take new challenge as motivation to success because ultimate solution links us to a whole new world.

"Customer First" has always been ATO's credo. In today's speedy world, customers always prefer to work with a reliable strategic alliance rather than a purely simple supplier. We rely on more than ten years of experience in the relay industry in China, providing safe and reliable signal relays with supreme quality.

Signal relay internal composition

Internal Composition of Signal Relay


A signal relay is an electromechanical device used to control or switch electrical signals. Its internal composition can vary based on its design and intended application, but here are the common components you might find in a typical signal relay:

  • Coil. The coil is one of the most critical components of a relay, and it is the component that generates the magnetic field of the relay. By powering on and off the coil, the on/off state of the relay can be controlled.
  • Iron Core. The iron core is an important component of the coil, which can form a magnetic circuit and concentrate electromagnetic induction.
  • Contact Component. The contact component is the main load part of the relay, including components such as contacts and terminals. The basic working principle of natural electrical appliances is to achieve on-off function through the opening and closing control circuit of contacts.
  • Counterweight Shrapnel. Counterweight shrapnel is a reference system for controlling relays, and the sensitivity of the contacts to open and close can be adjusted through appropriate counterweights.
Get Your Right Relay


Signal Relay Material


Copper coils

Copper coils are highly conductive and last longer. Copper coil power 200mW/150mW optional.

Plastic shell

Plastic shells with excellent impact properties ensure the safety and stability of the internal electronic components.

Silver alloy contact

Gold plating contact

Equipped with high sensitive type silver alloy contacts, they make the signal relay have better electrical conductivity.

Signal Relay FAQ

What is the function of signal relay?

A signal relay switch is an electromagnetic switch that plays a crucial role in controlling the flow of electrical signals within various systems. It functions by using a small input signal, typically in the form of a low-voltage electrical current, to control a larger electrical circuit. When the input signal is applied, the relay's coil becomes magnetized, causing its internal switch contacts to close or open, depending on the relay type. This action enables the relay to isolate and protect sensitive electronic components from high-power circuits, facilitate remote control, and automate processes by allowing one circuit to control another. Signal relays are widely used in applications such as industrial automation, telecommunications, and automotive electronics.

What is the typical contact rating for signal relay?

The typical contact rating for signal relays ranges from a few milliwatts to a few watts. These relays are designed for low-power applications, such as switching control signals in electronics, telecommunications, and instrumentation. Signal relays usually have small, sensitive, and low-voltage coils that can operate at a few milliamperes. The contact ratings are determined by the maximum voltage and current they can handle without significant wear or damage. Ratings typically range from 30VDC/120VAC to 100VDC/250VAC for voltage, and from a few milliamps to 2A for current. However, specific ratings can vary depending on the relay's design and intended application.

What are the common failure modes of signal relay?

Common failure modes of signal relays include contact degradation due to arcing and oxidation, leading to increased resistance and reduced signal quality. Coil failure, often caused by overvoltage or overheating, can result in the relay becoming inoperable. Insulation breakdown and contamination may cause short circuits or unintended signal paths. Mechanical failures, such as misalignment, spring fatigue, or foreign object interference, can impair relay operation. Environmental factors like dust, humidity, and temperature extremes can also impact relay performance. Regular maintenance, appropriate design considerations, and selecting relays with suitable ratings can mitigate these failure modes.

How do signal relays differ from solid state relay?

Signal relay switch and solid state relay serve similar functions in controlling electrical circuits, but they differ in their operating mechanisms. Signal relays use an electromagnetic coil to mechanically switch contacts, physically opening or closing the circuit. In contrast, SSRs use semiconductor components like thyristors to control the flow of current without any moving parts, making them more durable and quieter. SSRs are faster, have longer lifespans, and are often used for precise control of low-power signals or in applications where mechanical wear and tear is a concern, while signal relays are suitable for more general-purpose switching of higher-power loads.

Can signal relay handle high voltage signals?

Signal relay is typically designed for low-voltage signal switching and may not handle high-voltage signals effectively. High-voltage signals can lead to arcing, insulation breakdown, and safety hazards in conventional signal relays. To handle high-voltage signals, specialized high-voltage relays with robust insulation and contact materials are recommended. These relays are designed to withstand the higher voltage levels and prevent electrical discharge or damage. Using standard signal relays for high-voltage applications can result in reliability issues, safety concerns, and premature failure, making it essential to choose relays specifically designed for high-voltage requirements to ensure proper performance and safety.

More from ATO Relays …
Digital timer relay

Timer Relays

A timer relay is an electrical device that combines the functions of a relay and a timer. It can be used to control the timing of electrical circuits by allowing or interrupting the flow of current after a predetermined time period.
Electromagnetic relay

Electromagnetic Relays

An electromagnetic relay is an electrical switch that uses an electromagnet to control the flow of current in a circuit. When the electromagnet is energized, it mechanically closes or opens the switch, allowing or interrupting the electrical flow.
Voltage monitoring relay

Monitoring Relays

A monitoring relay is an electrical device that senses specific conditions in a system, such as voltage, current, or temperature, and triggers an action, like shutting down the system or activating an alarm, when preset limits are exceeded.