Relay Supplier for
All Types

Relays are key industrial control components used to manage high-voltage/high-current loads in manufacturing, energy, and building automation.

We are a trusted relay distributor and reliable relay supplier for global markets.

 

Our genuine, high-quality relays from brands like Siemens and Schneider come with distinct advantages for our B2B partners:

  • Authenticity Guaranteed: We provide 100% genuine products, which is a key solution to the market's need for authenticity and robust quality.

  • Flexible Logistics & Payment: Our overseas warehouses shorten delivery times; VTB accounts and local transfers support Russian and North American buyers.
  • Targeted Product Solutions: Our industry expertise allows us to recommend cost-effective products and alternative solutions based on your budget and requirements.

Main Components of Relays

Partner with a trusted relay supplier that meets your exact engineering specifications. Explore our wide selection of highly configurable relays and AC contactors, with extensive options for contact configuration, coil voltage, and operational current to build dependable and efficient control systems.
General-purpose Relays

General-purpose Relays

Contact configuration: 1 [1CO] 2 [2CO] 3 [3CO]
Rated current: A [5A] B [10A] C [16A]
Coil voltage: D [12V] E [24V] F [24V AC] G [230V AC]

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Control Relays

Control Relays

Contact form: A [2NO+2NC] B [4NO] C [3NO+1NC]
Coil voltage: B [24V] E [48V] FE [115V] G [230V AC]
Number of poles: 2 [2] 4 [4]

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Monitoring Relay

Monitoring Relay

Monitoring type: V [Voltage] C [Current] P [Phase]
Power supply voltage: A [24V AC/DC] B [100-240V AC] C [48V DC]
Output configuration: 1 [1CO] 2 [2CO]

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Timing relays

Timing relays

Timing function: A [On-delay] B [Off-delay] M [Multifunction]
Time range: 1 [0.1s-10s] 2 [1s-100s] 3 [0.1min-10min]
Control voltage: B [24V] FE [115V] G [230V AC]

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Safety relays

Safety relays

Safety function: E [E-STOP] S [Safety Gate] L [Light Curtain]
Safety category: 1 [Cat 1] 2 [Cat 2] 3 [Cat 3] 4 [Cat 4]
Input voltage: B [24V] C [32V] E [48V]

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Relay Module

Relay Module

Number of channels: 1 [1] 2 [2] 4 [4] 8 [8]
Coil voltage: A [5V] D [12V] B [24V]
Contact rating: A [5A] B [10A]
Mounting type: P [PCB Mount] D [DIN Rail Mount]

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Terminal block relays

Terminal block relays

Load current: A [6A] B [10A]
Contact configuration: 1 [1CO] 2 [2CO]
Coil voltage: B [24V] G [230V AC]
Connection type: S [Screw] P [Spring]

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What is a relay?

A relay is an automatic switching device that works on the electromagnetic principle and is used to achieve functions such as signal amplification, electrical isolation, logic control or remote control in a circuit. It controls large currents through small currents.

What is a relay?

What Types of Relays?

General-purpose Relays

General-purpose relays are an automatic switching element widely used in electrical control systems. Their core function is to control the on and off of large current loads through small current signals to achieve circuit isolation, amplification or logic control.

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General-purpose relays

Control Relays

Control Relays are core components used for logic control, signal amplification and electrical isolation in electrical automation systems. They receive control signals (such as voltage, current or digital signals) to drive contact action to achieve on/off, switching or delay control of load circuits. Their core value lies in driving high-power loads with low-power signals and building flexible automation logic.

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Monitoring Relay

Monitoring Relay is an intelligent relay that is dedicated to real-time monitoring of electrical parameters (such as voltage, current, frequency, phase, etc.) and triggering protection actions when abnormalities occur.

Its core function is to continuously monitor the operating status of the power system or equipment through high-precision sensors and logic judgment circuits, and quickly cut off the circuit or issue an alarm when the parameters exceed the safety threshold, thereby avoiding equipment damage and ensuring stable system operation.

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Monitoring Relay

Timing Relays

Timing Relays are an automation component dedicated to achieving time delay control.

Its core function is to control the contact action according to preset time parameters (such as delayed closing, delayed opening) after receiving the trigger signal through the built-in timing circuit (mechanical or electronic), thereby introducing the time dimension into the circuit and achieving precise timing management of logic control and automation processes.

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Timing relays

Safety Relays

Safety Relays are fail-safe control components designed for high-risk industrial scenarios. Their core mission is to reliably cut off the risk source and maintain a safe state when personnel, equipment or environment are facing potential dangers through redundant design, forced guided contacts, self-diagnosis functions and other mechanisms, so as to avoid accidents or reduce the degree of harm.

Their application scope covers areas with strict safety requirements such as machinery manufacturing, automobile production lines, and chemical equipment. We offer reliable safety relays for machinery control from brands like Omron.

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Safety relays

Relay Module

Relay Module is an integrated and standardized electrical control component that encapsulates a single or multiple relays and their drive circuits, protection components, interface terminals, etc. in a modular housing, and realizes on-off control of the load circuit through external signals (such as voltage, current, digital signals).

Its core value lies in simplifying electrical system design, improving reliability and reducing installation costs. It is widely used in industrial automation, smart home, energy management, security monitoring and other fields.

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Relay Module

Terminal Block Relays

Terminal Block Relays are electrical control components that deeply integrate relay functions with terminal block structures. Through modular design, relay contacts, drive circuits, wiring terminals, status indicators, etc. are integrated into standardized units and directly installed on the DIN rail of the power distribution cabinet or control box.

Its core value lies in simplifying on-site wiring, improving installation efficiency, and reducing maintenance costs, while taking into account electrical isolation, signal amplification, and multi-channel control functions.

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Terminal block relays
How to troubleshoot and prevent relay contact sticking?

How to troubleshoot and prevent relay contact sticking?

Troubleshooting:
Appearance inspection (contact erosion/spacing), multimeter to measure on-off resistance, oscilloscope to monitor arc, load simulation temperature measurement (<85℃), and voltage drop (<0.5V).


Prevention: When selecting, the load current should be ≤80% of the contact rating, and the inductive load should be equipped with an RC buffer circuit or a diode for continuous current; avoid frequent on-off (<30 times/minute), and apply an anti-oxidant in high temperature and high humidity environments.

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How to select solid-state relays (SSR) and electromagnetic relays (EMR)?

Contact failure requires a matching load + arc extinguishing design. 

When selecting, use SSR for high frequency/explosion-proof and EMR for high current/low cost. A dual redundant design (SSR+EMR in parallel) can be used for complex scenarios.

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How to select solid-state relays (SSR) and electromagnetic relays (EMR)

Choosing a Relay

There are several key factors to consider when choosing the right relay for your scenario. Keep the following in mind when choosing:

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Basic Working Principle of Relays

Basic Working Principle of Relays

  • The electromagnetic coil is energized to generate a magnetic field, which attracts the armature to drive the contacts to close or open, thereby controlling the on and off of the circuit.
  • Because of its characteristic of "small current controlling large current", it is called an electric control switch.
Relay components

Relay components

  • Electromagnetic coil: generates magnetic force
  • Contacts: conducts/cuts off the circuit
  • Armature: transmits mechanical force
  • Spring : resets contacts

Mechanical relays switch via physical contacts, while solid-state relays (SSRs) switch without contacts using semiconductor devices (such as thyristors).

DC Motor Relay Selection

DC Motor Relay Selection

Select contact current ≥ 2 times the rated current of the motor, and give priority to models with arc extinguishing hoods;

inductive loads require parallel diodes/RC circuits to absorb back electromotive force to avoid contact spark erosion and adhesion.

 

Are there specific environmental conditions (e.g., temperature, humidity)?

Are there specific environmental conditions (e.g., temperature, humidity)?

Relays have specific operating temperature and humidity ranges (e.g., 0-40°C, 90% humidity).

If the environment is too hot, too cold, or too humid, the relay may malfunction or have a shortened lifespan.

Choosing a relay suitable for your environment is crucial, as some models are designed for harsh conditions.

5.How many relays are required for forward and reverse control of a three-phase motor?

5.How many relays are required for forward and reverse control of a three-phase motor?

At least two contactors (high-power relays) are required to switch the phase sequence and cooperate with the interlock circuit to prevent a short circuit due to simultaneous power on.

Accessories

We carry a wide variety of accessories to go along with our robust selection of motor controls. Some of these accessories include the following options:

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Contacts

Contacts

Contacts are key components in relays that enable or disable circuits.

They are connected or separated from fixed contacts by the action of the armature, thereby controlling the connection or disconnection of external circuits.

The performance of contacts directly affects the reliability and service life of relays.

Coil

Coil

The coil is the core component of the relay that generates electromagnetic force. The current flowing through its winding generates a magnetic field, providing a driving force for the relay to operate.

When current passes through the coil, a magnetic field is formed inside it, attracting the armature to move, thereby changing the state of the contacts and realizing the on-off control of the circuit.

FAQs when choosing a relay

Why do we need to configure an intermediate relay in a low-voltage power distribution cabinet?
It is used to expand control signals (such as when the PLC output port is insufficient), isolate strong and weak current circuits, and protect the controller from voltage shocks.
Are there specific environmental conditions (e.g., temperature, humidity)?
VFDs have specific operating temperature and humidity ranges (e.g., 0-40°C, 90% humidity). If the environment is too hot, cold, or humid, the VFD may malfunction or have a shortened lifespan. Choosing a VFD designed for your environment is crucial, as some models are built for harsh conditions.
How many relays are required for forward and reverse control of a three-phase motor?
At least two contactors (high-power relays) are required to switch the phase sequence and cooperate with the interlock circuit to prevent short circuit due to simultaneous power on.

Trusted Relay Brands

Schneider logo

Schneider

Schneider relays are renowned for their exceptional reliability and advanced control technology in the fields of industrial automation and electrical control. Manufactured with high-quality materials and precision engineering, they offer outstanding electrical and mechanical lifespans, ensuring stable operation even in harsh environments.
Schneider relays excel in contact performance, anti-interference capability, and safety, while complying with multiple international standards for easy installation and maintenance worldwide. Whether in machinery manufacturing, building control, or energy management systems, Schneider relays deliver precise, flexible, and efficient control solutions that help businesses improve productivity and system stability.

Popular Schneider Relay Series:

  • RXM Series General-Purpose Miniature Relays
  • RSL Series Ultra-Slim Relays
  • RE17/RE22 Series Timer Relays
  • CAD Series Control Relays
  • RM22 Series Monitoring Relays
  • Zelio Logic Series Smart Relays
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siemens

Siemens

Siemens relays, renowned for their German engineering excellence and advanced electrical control technology, hold a prominent position in the global industrial automation sector. Designed for high reliability and long service life, they are built with durable components and strict quality control, ensuring stable performance even under high-frequency operations and harsh conditions.
Siemens relays feature excellent contact switching capabilities, outstanding electromagnetic interference resistance, and versatile installation options to meet the control needs of various industries. Whether in manufacturing lines, energy systems, transportation, or building automation, Siemens relays deliver precise, safe, and efficient control solutions, helping users achieve system optimization and reliable operation.

Popular Siemens Relay Series:

  • Sirius Series Industrial Control Relays
  • 3RQ Series Timer Relays
  • 3RP Series Multifunction Timer Relays
  • 3RU Series Thermal Overload Relays
  • 7PV Series Monitoring Relays
  • LOGO! Series Smart Relays
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Siemens logo
Omron logo

Omron

Omron relays, known for their exceptional quality and innovative control technology, enjoy a high reputation in the global automation and electronic control industries. Designed for high sensitivity and durability, they are manufactured with premium materials and advanced production processes to ensure stable performance even under high-frequency switching, long-term operation, and harsh environments.
Omron relays offer excellent contact reliability, low-power drive, strong anti-interference capability, and a wide range of model options, making them widely used in industrial automation, home appliances, communication equipment, and energy systems. With precise, stable, and efficient control capabilities, Omron relays provide trusted solutions to meet diverse control and protection needs.

Popular Omron Relay Series:

  • MY Series General-Purpose Relays
  • G2R Series General-Purpose Relays
  • LY Series Power Relays
  • H3CR Series Multifunction Timer Relays
  • G9EA/G9EB Series High-Voltage DC Relays
  • ZEN Series Programmable Relays
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Honeywell

Honeywell

Honeywell relays, backed by extensive expertise in automation control and precision electronics, have earned widespread recognition in the global market. Known for their high reliability, superior performance, and durability, these products are built with premium components and subjected to rigorous quality control to ensure stable operation under high loads, high-frequency switching, and complex operating conditions.
Honeywell relays feature excellent contact switching capabilities, outstanding shock and vibration resistance, and superior electromagnetic compatibility, making them ideal for applications in aerospace, industrial automation, energy systems, rail transportation, and critical equipment control. Whether in harsh environments or mission-critical operations, Honeywell relays deliver precise, safe, and long-lasting control solutions.

Popular Honeywell Relay Series:

  • 1HP Series High-Performance Relays
  • 2/3/4 Series Sealed Relays
  • HPD Series Space-Grade Relays
  • HFD Series Medium-Power Relays
  • HE Series General-Purpose Relays
  • HSR Series Signal Relays
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Honeywell logo
Panasonic logo

Panasonic

Panasonic relays, backed by extensive expertise in precision electronics and control technology, are recognized worldwide as high-quality relay solutions. Designed with a focus on miniaturization, high performance, and long service life, they are manufactured using advanced processes and premium materials to ensure stable and reliable operation in high-frequency switching, low-power consumption, and diverse application environments.
Panasonic relays feature excellent contact performance, outstanding anti-interference capability, and flexible installation options, making them widely used in home appliances, industrial control, automotive electronics, communication equipment, and energy management. With their precision, efficiency, and durability, Panasonic relays provide trusted control and protection solutions for a wide range of industries.

Popular Panasonic Relay Series:

  • JW Series General-Purpose Power Relays
  • HE Series High-Power Relays
  • TQ Series Signal Relays
  • TX Series Ultra-Compact Signal Relays
  • HL Series High-Load Relays
  • ACV Series Automotive Relays
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CONTACT US

Looking for a reliable power relay manufacturer or trusted relay distributor?

SimplyBuy is your ideal choice!

We specialize in providing original and brand-new electrical control and automation products, covering renowned brands such as Schneider, Siemens, Mitsubishi, ABB, and Omron relay distributors. Whether you need a quick quote, technical support, or customized solutions, we respond within 12 hours to help your projects proceed smoothly.

Email

sales@simplying.com

Tel

+86 131-9261-2662

Address

No.600 Shenmei Road Pudong District ,Shanghai China 201318

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