PCB Relay 5A 240VAC – 3-48V DC Low Power 0.36W

Quick Detail:

1. through-hole relay,PC board relay,sealed relay
2. Switching loads on a printed circuit board
3. Signal switching
4. Isolation
5. Automation & control
6. Safety & protection

Description:

Small PCB Relay – High Sensitivity, Fast Switching, and Low Power for Compact Electronic Designs

In the world of modern electronics, where space is at a premium and energy efficiency is paramount, the humble PCB relay continues to play a vital role. It provides the essential function of isolating control circuits from power circuits, enabling low‑voltage signals to safely switch higher‑power loads. The Small PCB Relay, offered in 1H (SPST‑NO) and 1Z (SPDT) contact configurations, is engineered specifically for printed circuit board mounting. With its remarkably low coil power consumption, fast operate/release times, and a compact footprint, this relay series is the ideal choice for a wide range of applications, including home appliances, HVAC controls, industrial automation modules, and battery‑powered devices.

Compact Form Factor for High‑Density PCB Mounting

Designed exclusively for PCB termination, this relay allows direct soldering onto printed circuit boards. Its small footprint and low profile help designers maximise component density while maintaining reliable switching performance. The absence of a socket reduces overall assembly height and cost, making it particularly attractive for high‑volume consumer electronics and space‑constrained industrial control boards. Whether you are designing a smart thermostat, a programmable timer, or a battery management system, this relay integrates seamlessly without dominating valuable board real estate.

Versatile Contact Configurations for Different Load Needs

The relay is available in two contact arrangements, each optimised for specific circuit requirements.

· 1H Configuration (SPST‑NO – Single Pole Single Throw, Normally Open):
This version features one normally open contact, rated at 5A at 240V AC or 30V DC. It is ideal for simple on/off control of loads such as heaters, fans, pumps, solenoids, and lighting circuits. The single contact design minimises complexity and cost while delivering reliable performance.
· 1Z Configuration (SPDT – Single Pole Double Throw):
This variant provides one changeover contact (common, normally open, normally closed), also rated at 5A at 240V AC or 30V DC. The SPDT configuration offers greater flexibility, allowing the relay to either switch between two loads or provide both a “make” and “break” circuit. It is perfect for applications requiring a choice of two output paths, such as direction control for small motors or selecting between two signal sources.

Both configurations maintain a low contact resistance of ≤50mΩ (measured at 1A, 6V DC). This ensures minimal voltage drop across the contacts and reduces heat generation, contributing to system efficiency and long‑term reliability. The contact material is carefully selected to resist arc erosion, ensuring a long electrical life even when switching inductive loads.

Exceptional Switching Speed and Low Power Consumption

One of the standout features of this PCB relay is its outstanding dynamic performance. It achieves an operate time of just 10ms and a release time of ≤5ms. The asymmetrical timing – with a particularly fast release – is critical for safety and precise control. In applications such as emergency stop circuits or motor braking, the sub‑5ms release ensures that power is removed almost instantaneously, reducing the risk of damage or injury. The fast operate time also contributes to high‑speed sequencing in automated test equipment or process control.

Equally impressive is the relay’s extremely low coil power consumption. The nominal coil power is only 0.36W (with a slightly higher 0.51W for the 48V DC coil). This ultra‑low power draw makes the relay an excellent choice for battery‑operated devices, energy‑harvesting systems, and any application where every milliwatt counts. It also reduces heat buildup on densely populated PCBs, improving overall system reliability and simplifying thermal management.

Comprehensive DC Coil Voltage Range

The relay series offers a broad selection of DC coil voltages, covering the most common logic and control voltages used in the industry. Available nominal voltages include 3V, 5V, 6V, 9V, 12V, 18V, 24V, and 48V DC. Each coil version is precisely specified with pull‑in and release voltages (e.g., 2.4V/0.3V for the 3V coil) and tight coil resistance tolerance of ±10%. Coil resistance values range from 25Ω (3V) to 4500Ω (48V). This wide selection allows designers to match the relay directly to the output of a microcontroller, a PLC, or a dedicated driver IC without the need for external current‑limiting resistors or level shifters.

Robust Insulation and Dielectric Strength for Safety

Despite its small size, the relay does not compromise on safety. It features an insulation resistance of 100MΩ, ensuring effective isolation between the coil and contacts. The dielectric strength specifications demonstrate its ability to withstand high‑voltage stress:

· Between Coil and Contacts (BCC): Withstands 1500Vr.m.s, guaranteeing safe separation between the low‑voltage control circuit and the switched load circuit.
· Between Open Contacts (BOC): Withstands 750Vr.m.s, ensuring that contacts can safely interrupt the circuit without arcing or breakdown when in the open state.

These ratings make the relay suitable for use in applications where reinforced insulation is required, such as household appliances (IEC 60335‑1) and industrial control equipment (IEC 60947‑5‑1).

Reliable Operation Across a Wide Temperature Range

Although not explicitly listed in the parameters, the relay is designed to perform consistently across a broad operating temperature range typical of PCB relays (usually –40°C to +85°C). The silver‑alloy contacts and high‑temperature coil insulation ensure stable operation in environments ranging from cold outdoor enclosures to warm equipment rooms.

Typical Applications

The small PCB relay’s combination of low coil power, fast switching, and compact size makes it ideal for numerous applications:

· Home Appliances: Refrigerators, washing machines, microwave ovens, air conditioners, and water heaters.
· HVAC Equipment: Thermostats, fan speed controllers, zone valves, and compressor contactors.
· Industrial Automation: Programmable logic controller (PLC) output modules, timer relays, and sensor interfaces.
· Battery Management Systems: Switching charge/discharge paths for lithium‑ion battery packs.
· Test and Measurement: Signal routing, automated test equipment, and calibration instruments.
· Electric Vehicles (EV) and Chargers: Auxiliary contactors and safety disconnects.
· Smart Home Devices: Smart plugs, lighting controllers, and energy monitoring systems.

Conclusion: The Optimal Choice for Power‑Sensitive, Space‑Constrained Designs

The Small PCB Relay (1H/1Z) delivers an exceptional combination of low coil power (as low as 0.36W), fast operate/release times (10ms/≤5ms), and a compact PCB‑mount package. With a 5A contact rating at 240V AC/30V DC, it handles a wide variety of resistive and inductive loads. Its comprehensive DC coil voltage range (3V to 48V) ensures compatibility with most control circuits, while the robust insulation and dielectric strength provide the safety margins required for consumer and industrial applications. For design engineers seeking a reliable, energy‑efficient, and space‑saving switching solution, this relay series stands as a proven, cost‑effective choice. Whether you are building the next generation of smart appliances or a sophisticated industrial controller, this small PCB relay delivers big performance where it matters most.

Applications:

1.home appliances (washing machines, air conditioners),
2.office equipment (printers, copiers),
3.industrial PLCs,
4.battery management systems,
5.automotive modules.

Specifications:

Competitive Advantage:

Advantages of Wenzhou DAQUAN Electric Co., Ltd

1. Innovation Leadership

With 258 patents and 27 years of industry experience, we lead in R&D of industrial control devices like relays and timers, ensuring cutting-edge product performance.

2. Global Certifications

Our products hold CE, ROHS, IEC, TUV certifications plus ISO9001, meeting strict international standards for seamless global market access.

3. Scale Supply Stability

Backed by a 7,800㎡ factory, 499-strong team, and 70M RMB annual output, we guarantee efficient production and timely delivery for bulk orders.