Auxiliary Contacts

Auxiliary contacts, also known as auxiliary contactors, are electromechanical devices used in conjunction with primary switching equipment such as contactors, circuit breakers, switches, and relays. These secondary switching devices are mechanically linked to the main switching equipment and change state simultaneously. The add-on accessories are available in a range of contact configurations and mounting styles to suit a wide range of industrial control applications.

RS Philippines offers an extensive range of high-quality auxiliary contact blocks from industry-leading brands, including Schneider Electric, Siemens, ABB, Lovato, Eaton, and, of course, RS PRO.

How Do Auxiliary Contacts Work?

Auxiliary contacts are mechanically linked to the main switching contacts of a primary device (contactor, circuit breaker, etc.) so that they change state in direct correlation with the main contacts. This mechanical linkage ensures that the auxiliary contacts accurately reflect the state of the main contacts. They pass data about the main circuit's status to a logic controller (PLC, relay, etc.), which then uses this information to control other linked devices. Auxiliary contacts can also be used as standalone hardware control units in simpler circuits.

These auxiliary contacts come in various mounting styles, including front-mounted and DIN rail-mounted options, offering flexibility for different installation needs. Additionally, they are available with different terminal types, such as screw terminals, screw clamp terminals, and cage clamp terminals, ensuring compatibility with various electrical setups.

Benefits of Using Auxiliary Contacts

Auxiliary contacts offer a wide range of advantages, including:

Enhances Control Circuits

Auxiliary contactors provide additional switching options that enhance automation and circuit control. By working alongside main contacts, they enable advanced control functionalities in motor starters, relay systems, and industrial control panels. This ensures smoother operation, improved efficiency, and greater safety in electrical systems.

Versatile Applications

From industrial automation to safety interlocks, auxiliary contacts serve multiple purposes. They are widely used for motor control, signaling, and status indication in electrical panels. Their ability to integrate seamlessly into various electrical setups makes them invaluable across industries such as manufacturing, power distribution, and building automation.

Available in Various Configurations

Users can choose from normally open (N/O) or normally closed (N/C), or changeover (CO) auxiliary contacts, depending on their specific application requirements. These options provide flexibility in designing efficient electrical control systems.

Durable & Reliable

Designed for industrial-grade performance, auxiliary contacts are built to withstand demanding conditions, including high voltages, mechanical wear, and environmental factors. Their robust construction ensures long-term reliability, reducing maintenance costs and minimizing system downtime.

Types of Auxiliary Contact Blocks

Auxiliary contact blocks are available in different configurations to suit various control and safety needs.

Normally Closed (N/C) Auxiliary Contacts

These contacts remain closed when inactive and open when the circuit is engaged. They are commonly used as safety interlocks to prevent unintended machine operation.

Normally Open (N/O) Auxiliary Contacts

These contacts remain open until activated, at which point they complete the circuit. They are frequently used for status indication and additional control functions in automation.

Changeover (CO) Contacts

These contacts have three terminals: a common terminal, a normally closed terminal, and a normally open terminal. When the main device actuates, the common terminal switches from the NC terminal to the NO terminal.

Applications of Auxiliary Contacts

Common applications for auxiliary contactors in the Philippines include the following:

Motor Control Systems

In motor control applications, auxiliary contacts serve as essential feedback mechanisms, ensuring smooth and safe motor operation. They provide status signals in push-button control stations, allowing operators to monitor motor activity and detect faults such as overloads or circuit failures. By integrating auxiliary contacts into motor starters and control relays, businesses can enhance equipment protection and minimize downtime in industrial operations.

Industrial Automation

Auxiliary contacts are essential components in relay logic systems and control panel circuits. These contacts enable precise communication between electrical components, ensuring that automated processes function correctly. Whether used in conveyor systems, robotic manufacturing, or production lines, auxiliary contacts help streamline operations, improve efficiency, and enhance workplace safety.

Power Distribution Systems

In electrical distribution networks, auxiliary contacts facilitate safe switching of electrical loads, preventing circuit overloads and ensuring stable power flow. They are commonly used in circuit breakers, transfer switches, and load management systems to maintain electrical safety and efficiency.

Why Choose RS for Auxiliary Contacts?

For sourcing high-quality auxiliary contacts in the Philippines, RS is a trusted supplier, providing top-tier solutions for industrial and electrical applications. Our wide selection includes normally open (N/O), normally closed (N/C), and changeover (CO) auxiliary contacts, ensuring that businesses and professionals can find the right components to enhance their control circuits.

At RS Philippines, we prioritize quality and reliability, offering auxiliary contacts from leading global manufacturers. Whether you're looking for electrical auxiliary contacts for motor control or auxiliary contact blocks for power distribution, our inventory meets the highest industry standards.

In addition to our extensive selection, we ensure fast and efficient delivery across the Philippines, allowing businesses to access critical electrical components without delays. With RS Philippines, you get reliable performance, expert support, and seamless procurement for all your auxiliary contact needs.

Buy Auxiliary Contacts in the Philippines

Shop RS Philippines’ wide range of auxiliary contacts designed for industrial automation and electrical applications. Whether you need normally open or normally closed auxiliary contacts, we offer competitive pricing and bulk purchase options to meet your requirements. You can also find industrial relays, motor circuit breakers, and more in our extensive catalogue.

Browse our collection today and find the best auxiliary contact solutions for your business.