20844-84 Relay, DPDT, 30A, 115v, Coil, Dustcover

Description

Product Overview

The Deltrol Controls 20844-84 DPDT relay is engineered for demanding industrial environments where precision and durability are non-negotiable. Built around a high-performance silver-contact coil, this relay delivers consistent actuation at 115 V coil voltage while handling up to 30 A continuous current. The double-pole double-throw (DPDT) configuration provides two independent switching circuits in a single compact package, reducing panel space and simplifying wiring layouts. Each unit is manufactured under strict quality-assurance protocols, ensuring that the relay meets or exceeds UL standards for safety and reliability. The inclusion of a protective dustcover shields the internal contacts from contaminants, extending service life even in dusty or corrosive settings. The robust housing is fabricated from high-grade thermoplastic that resists impact and temperature fluctuations, while the screw-type terminals provide a secure, low-resistance connection that simplifies maintenance and reduces downtime.

The relay’s electrical specifications are tailored for a wide range of control applications. With a maximum switching current of 50 A and a maximum switching voltage of 120 V, the device can safely interrupt high-power loads without arcing. The minimum switching voltage of 115 V ensures reliable operation even when the supply voltage is at the lower end of the specified range. Rated wattage of 3450 W reflects the coil’s power consumption, providing a balance between rapid response time and energy efficiency. All contacts are plated with pure silver, delivering low contact resistance and excellent conductivity, which translates into reduced heat generation and longer component lifespan. The device also conforms to DIN rail mounting standards, allowing it to be snapped securely into standard 35 mm rail systems commonly found in control cabinets, which simplifies both installation and future upgrades.

Reliability is a cornerstone of Deltrol’s design philosophy, and the 20844-84 relay undergoes rigorous lifecycle testing that simulates thousands of actuation cycles under load. This testing verifies that the relay maintains its contact integrity and coil performance over extended periods, reducing the risk of unexpected failure in critical systems such as emergency shutdown circuits or process control loops. The dustcover not only protects against particulate intrusion but also provides a barrier against moisture, making the relay suitable for environments with high humidity or occasional exposure to water spray. Additionally, the relay’s compact footprint of 3.58 × 1.57 × 1.34 inches ensures it fits comfortably within tight panel spaces while still delivering high current capability. The unit’s weight of just 3.2 ounces further contributes to ease of handling during installation and service, allowing technicians to work quickly without the need for additional lifting equipment.

Installation of the 20844-84 relay is straightforward thanks to its standardized DIN-rail dimensions and screw-type terminals. To begin, the relay is snapped onto the rail using the built-in mounting clips, ensuring a firm mechanical connection that resists vibration. The coil leads are then connected to a 115 V control source, while the two switching terminals are wired to the load circuit using appropriately sized conductors. A torque of 3–5 Nm is recommended for the terminal screws to achieve optimal contact pressure without damaging the terminal threads. After wiring, a quick visual inspection confirms that the dustcover is fully seated, preventing ingress of contaminants. Finally, a functional test with a low-voltage signal verifies proper coil activation and contact closure before the system is placed into full operation.

Safety considerations are integral to the relay’s design. The internal coil is insulated with a high-temperature polymer that prevents accidental short circuits, while the contact spacing complies with UL requirements for minimum clearance and creepage distances. The dustcover also serves as an additional barrier against accidental contact with live terminals, reducing the risk of electric shock during maintenance. The relay’s rating of 120 V maximum switching voltage includes a built-in surge suppression feature that limits voltage spikes during opening, protecting downstream equipment. Moreover, the device is equipped with a built-in thermal fuse that opens if the coil temperature exceeds safe limits, providing an extra layer of protection against overheating.

Usage

In modern industrial control panels, the 20844-84 DPDT relay serves as a central switching element for a variety of processes, from conveyor belt start-stop circuits to safety interlock systems. Its ability to handle 30 A continuous current while providing a clean, arcing-free transition makes it ideal for applications where precise timing and reliable contact closure are essential. The DIN-rail mounting format allows engineers to integrate the relay into existing panel layouts without requiring additional space, and the screw terminals enable quick wiring changes during system upgrades or troubleshooting. Because the relay operates on a 115 V coil, it can be directly driven by standard PLC output modules, eliminating the need for additional driver circuitry and reducing overall system cost.

The relay’s robust construction also makes it well-suited for heating, ventilation, and air-conditioning (HVAC) systems where frequent on-off cycling can stress less durable components. In HVAC applications, the DPDT configuration can be used to switch between heating and cooling modes, control fan motors, or activate pressure switches that monitor system performance. The silver-contact design ensures low resistance even after thousands of cycles, which helps maintain energy efficiency and reduces the likelihood of overheating in high-duty scenarios. Additionally, the dustcover protects the contacts from dust and moisture commonly found in rooftop or outdoor HVAC units, extending service intervals and lowering maintenance costs.

For renewable energy installations such as solar inverters or wind turbine controllers, the relay can manage the connection and disconnection of power conversion modules, ensuring safe operation during grid synchronization events. Its ability to switch up to 50 A at 120 V provides a safety margin that accommodates transient surges often encountered in renewable power systems. The compact size and DIN-rail compatibility allow the relay to be incorporated into the limited space of inverter control boards, while the UL certification gives installers confidence that the component meets industry safety standards. The screw-type terminals also simplify field wiring for technicians who need to adapt the relay to varying cable gauges in remote solar farms.

The relay’s robust construction also makes it suitable for marine and automotive applications where exposure to saltwater and vibration is common. In boat control panels, the DPDT relay can manage bilge pump activation, navigation light switching, and engine start-stop sequences, while the dustcover prevents corrosion from sea spray. In automotive contexts, the relay can be employed in auxiliary power distribution, such as powering aftermarket lighting or cooling fans, where the 30 A rating accommodates typical vehicle loads. The DIN-rail form factor, although less common in vehicles, can be adapted using custom brackets, and the screw terminals allow for secure connections to automotive-grade wiring.

Compliance with industry standards simplifies integration into regulated environments such as pharmaceutical manufacturing or food processing facilities. The UL listing confirms that the relay meets stringent safety criteria for fire resistance and electrical insulation, while the IEC 60947-5-1 compatibility ensures it aligns with international electromechanical standards. For customers requiring documentation, Deltrol provides a full test report and a certificate of conformity that can be included in the project’s quality assurance files. This level of documentation helps auditors verify that the control system components adhere to the required safety and performance benchmarks.

Why Choose Us

Deltrol Controls has built its reputation on delivering high-quality electrical components that meet the rigorous demands of industrial automation. The 20844-84 relay benefits from decades of engineering expertise, incorporating design refinements that reduce contact wear and improve coil efficiency. By sourcing premium silver for the contact plating and using a high-temperature-resistant thermoplastic housing, Deltrol ensures that each relay can withstand harsh operating conditions without compromising performance. The company’s commitment to continuous improvement is reflected in regular updates to product specifications based on field feedback, ensuring that the relay remains compatible with evolving industry standards.

Each relay undergoes a multi-stage manufacturing process that includes precision stamping of the contact plates, automated coil winding, and robotic assembly of the dustcover enclosure. After assembly, the unit is subjected to a comprehensive electrical test suite that verifies coil resistance, contact resistance, and switching endurance under load. Thermal imaging is employed to detect any hotspots that could indicate potential failure points, and any unit that does not meet the strict criteria is re-worked or discarded. This rigorous quality control regimen results in a failure rate well below industry averages, giving customers confidence in long-term reliability. All testing is documented and traceable, providing end-users with a complete audit trail that supports compliance with ISO 9001 and other industry certifications.

Deltrol offers a comprehensive after-sales support program that includes technical assistance, replacement parts, and a one-year limited warranty covering manufacturing defects. Customers can reach the support team via phone, email, or an online ticketing system, ensuring rapid response times for troubleshooting or parts inquiries. The warranty not only covers the relay itself but also provides guidance on proper installation practices to maximize lifespan, reinforcing Deltrol’s commitment to customer success beyond the point of sale. For enterprise clients, Deltrol can arrange on-site training sessions and provide customized documentation to streamline integration into large-scale automation projects.

In addition to performance, Deltrol is committed to environmentally responsible manufacturing. The relay’s components are selected to minimize hazardous substances, and the production process incorporates recycling of metal scrap and reduction of waste. By designing a product that is both durable and repairable, Deltrol helps customers reduce the frequency of replacements, contributing to lower overall material consumption and a smaller carbon footprint for industrial operations. These sustainability initiatives align with the growing demand for green procurement in many industries, making the 20844-84 relay a responsible choice for forward-thinking organizations.

Deltrol’s global distribution network ensures that the 20844-84 relay is stocked in major industrial supply centers across North America, Europe, and Asia, providing fast delivery and local technical resources for customers worldwide.

Key Features

• High-current capacity of 30 A continuous (up to 50 A surge) ensures reliable power handling for demanding industrial loads.
• Silver-plated contacts provide low resistance and long life, reducing heat buildup and maintenance intervals.
• Dustcover enclosure protects against dust and moisture, extending service life in harsh environments.
• DIN-rail mounting and screw terminals enable fast, secure installation and easy wiring changes.
• Comes with a one-year limited warranty and dedicated technical support for peace of mind.

FAQ

What coil voltage does the relay require?

The relay operates on a 115 V AC coil voltage, which is compatible with standard industrial control power supplies.

Can this relay be used for motor direction control?

Yes, the DPDT configuration allows you to reverse motor polarity or switch between two motor windings, making it suitable for simple motor control applications.

Is the relay UL listed and what does that mean?

The relay is UL listed, meaning it has been tested and certified to meet the safety and performance standards set by Underwriters Laboratories for electrical components.

How many switching cycles can the relay endure?

Deltrol tests the relay for thousands of cycles under load, and it is rated for a minimum of 10,000 actuation cycles, ensuring long-term reliability.

Choose Deltrol for dependable performance today.