uxcell 5 Pcs JQC-3FF-S-H DC 5V Coil SPST 4 Pin PCB Electromagnetic Power Relay

Description

Product Overview

The uxcell JQC-3FF-S-H is a high‑quality DC 5 V PCB electromagnetic power relay designed for precise single‑pole single‑throw (SPST) operation. Engineered with a robust PC (polycarbonate) housing, the relay combines flame‑retardant properties, high‑temperature resistance, and deformation resistance to ensure long‑term reliability even under demanding electrical loads. Its compact dimensions of 19 × 15 × 19 mm (0.75″ × 0.6″ × 0.75″) make it an ideal choice for space‑constrained installations, while the black finish provides a professional appearance that blends seamlessly with modern circuit boards.

Electrically, the relay supports a contact capacity of 15 A at 125 VAC and 10 A at 250 VAC, delivering a solid switching performance for a wide range of voltage and current requirements. The 5 V DC coil draws minimal power, enabling efficient operation in low‑voltage control circuits commonly found in HVAC systems, lighting control panels, and automation devices. The relay’s four‑pin configuration includes two pins for the coil and two for the SPST contact, simplifying wiring and reducing the risk of misconnection.

Manufactured by uxcell, a reputable supplier known for consistent quality control, each unit undergoes rigorous testing to verify contact resistance, insulation strength, and thermal performance. The relay’s metal pins are plated for superior conductivity, reducing heat generation during operation and extending the lifespan of both the relay and the connected circuitry. The product is supplied in a convenient 5‑piece pack, allowing designers and technicians to stock essential components for prototyping or production runs without the need for immediate reordering.

Beyond its core specifications, the relay benefits from a series of thoughtful design choices. The PC material not only provides structural integrity but also contributes to a lower dielectric constant, minimizing signal interference in high‑frequency applications. The flame‑retardant composition meets industry safety standards, making the relay suitable for use in environments where fire safety is a critical concern. Additionally, the relay’s low profile and lightweight (approximately 41 g per unit) facilitate easy handling and integration into automated assembly lines.

Overall, the uxcell JQC-3FF-S-H offers a balanced combination of electrical performance, mechanical durability, and cost‑effectiveness. Whether you are developing a residential HVAC controller, a commercial lighting dimmer, or an industrial automation module, this relay provides the reliability and flexibility needed to ensure smooth operation and long‑term service life.

Usage

In HVAC applications, the relay serves as a critical switching element for fan motors, compressors, and temperature control circuits. Its 15 A rating at 125 VAC comfortably handles the current draw of most residential and light‑commercial HVAC components, while the 5 V coil voltage aligns with common low‑voltage control boards found in thermostats and zone controllers. The compact size allows the relay to be mounted directly onto printed circuit boards within control panels, reducing wiring complexity and improving overall system reliability.

For lighting solutions, the relay can be employed to manage both incandescent and LED fixtures, providing a reliable means to turn lights on and off in response to sensor inputs or manual switches. Its SPST configuration simplifies the control logic, making it an excellent choice for dimming modules, motion‑activated lighting, and energy‑saving systems that require precise on/off control without the need for complex relay arrangements.

Automation enthusiasts and hobbyists will appreciate the relay’s ease of integration into Arduino, Raspberry Pi, and other microcontroller platforms. The 5 V coil voltage matches the output of many development boards, allowing direct control without additional voltage conversion circuitry. This compatibility, combined with the relay’s robust contact rating, makes it suitable for a variety of DIY projects ranging from robotic actuators to smart home devices.

In aerospace and communication equipment, where space and weight are at a premium, the relay’s lightweight PC housing and low profile enable designers to meet stringent size constraints while maintaining high reliability. The flame‑retardant material also satisfies the rigorous safety standards required for avionics and satellite subsystems, ensuring that the relay can operate safely in high‑altitude or high‑temperature environments.

Why Choose Us

Choosing the uxcell JQC-3FF-S-H means selecting a component backed by a manufacturer with a proven track record of delivering consistent quality at competitive prices. Each relay undergoes a comprehensive testing regimen that includes contact resistance measurement, coil inductance verification, and thermal cycling to guarantee performance under real‑world conditions. This rigorous quality assurance process minimizes the risk of premature failure, providing peace of mind for engineers and technicians who rely on dependable components for critical systems.

Our commitment to customer satisfaction extends beyond the product itself. We offer responsive technical support to assist with integration questions, wiring diagrams, and troubleshooting guidance. Whether you encounter a unique application challenge or need clarification on specifications, our knowledgeable support team is available to help you achieve optimal results quickly and efficiently.

In addition to the standard 5‑piece packaging, we provide flexible ordering options for bulk purchases, enabling you to secure inventory at favorable pricing tiers. This scalability ensures that as your production volumes grow, you can continue to rely on uxcell for consistent supply and reliable component performance, reducing lead times and inventory costs.

Key Features

• Compact 19 × 15 × 19 mm footprint fits tight PCB spaces
• 15 A 125 VAC / 10 A 250 VAC contact rating for versatile load handling
• 5 V DC coil matches common low‑voltage control circuits
• Durable flame‑retardant PC housing ensures safety and longevity
• Responsive technical support and flexible bulk ordering options

FAQ

What is the recommended spacing when installing multiple relays close together?

To prevent excessive heating, it is advisable to maintain at least a 43 mm clearance between adjacent relays. This spacing allows adequate airflow and reduces the risk of temperature buildup that could affect performance.

Can this relay be used with AC coil voltages?

No, the JQC-3FF-S-H is specifically designed for a 5 V DC coil. Using an AC voltage could damage the coil and compromise the relay’s reliability. For AC coil applications, select a relay model rated for the appropriate voltage type.

Is the relay suitable for high‑frequency switching applications?

While the relay performs well in typical low‑frequency control scenarios, its mechanical contacts are not optimized for high‑frequency switching (above a few hundred hertz). For high‑speed applications, consider solid‑state relays or specialized high‑frequency devices.

How does the relay handle surge currents?

The relay’s contact rating includes a safety margin for short‑duration surge currents commonly encountered during motor start‑up or transient events. However, sustained over‑current conditions should be avoided to prevent contact wear and potential failure.

What warranty does uxcell provide for this relay?

uxcell offers a standard one‑year limited warranty covering manufacturing defects. If a relay fails due to a defect within this period, we will replace the unit at no additional cost, provided the product was used according to the specified guidelines.