W15L Series 20A High-Power Latching Relay: A Core Component for Smart Home and Lighting Control

In the fields of smart homes, commercial lighting, and industrial control, relays serve as key actuators for circuit switching, and their load capacity, safety, and reliability directly determine the performance of the entire system. The W15L Series is a latching relay featuring 20A switching capability, 750A short-circuit impulse withstand, manual control support, and compliance with the IEC60335-1 standard. With its compact dimensions (29.0 × 12.7 × 16.0 mm) and flexible configuration options, it is an ideal choice for smart meters, lighting systems, and home appliance control.

W15L 16A 20A Latching Relay UL TUV CQC CompliantThe W15L Series is a compact 20A latching relay featuring 750A 10ms short-circuit withstand, optional manual control, and up to 105℃ operating temperature. Certified to UL/TUV/CQC and compliant with IEC60335-1 and RoHS, it is an energy-efficient solution for smart home and lighting control.View Product →

Core Product Advantages

Robust Load and Impulse Withstand Capability

• 20A Switching Capability: Supports resistive load switching up to 20A 250VAC, easily handling high-power appliances and lighting equipment.
• High Short-Circuit Withstand: The contacts can withstand a 750A 10ms short-circuit impulse current, significantly enhancing system safety redundancy and reliability.
• Wide Voltage Switching: Maximum switching voltage up to 277VAC and maximum switching capacity of 5000VA for a wide range of applications.

Smart Manual Control Function

This series offers an optional Hand Control Switch. Users can directly control the contact on/off state via a physical switch. This feature is extremely practical for emergency power-off scenarios in smart homes, as well as for equipment debugging and maintenance.

High-Temperature and Harsh Environment Adaptability

• High-Temperature Version: Available in a version with an ambient temperature of up to 105℃, suitable for equipment interiors with high heat generation.
• Insulation System: Utilizes UL-recognized Class F insulation system for safety and reliability.
• Environmental Compliance: Compliant with RoHS environmental standards, making it an environmentally friendly product.

Detailed Technical Specifications and Performance Analysis

Contact and Electrical Performance

The W15L contacts are made of AgSnO2 (Silver Tin Oxide), offering excellent resistance to arc erosion and welding. Its standard rated load is 16A 250VAC, and it supports resistive loads up to 20A 250VAC with a maximum switching capacity of 5000VA. Initial contact resistance is as low as ≤50mΩ, and operate time is ≤15ms for quick response. Mechanical life reaches 1×10⁶ operations, and initial insulation resistance is 1000MΩ (500VDC), balancing long life with high safety.

Coil Parameters

The W15L adopts a latching design, requiring coil energization only at the moment of state switching (≤15ms). It relies on a permanent magnet to maintain the contact state, consuming no continuous current and generating minimal heat. The single-coil type (L1) achieves Set/Reset via forward and reverse pulses; the double-coil type (L2) uses two independent coils for separate control, offering clearer logic. The product offers multiple standard voltage specifications from DC 3V to DC 48V. The single-coil rated power is only 500mW, and the double-coil is 1000mW, making it ideal for power-sensitive applications such as smart meters.

Single Coil Latching

Double Coils Latching

Environmental and Physical Parameters

The W15L achieves high power density in a limited space, measuring only 29.0 × 12.7 × 16.0 mm and weighing approximately 15g. The standard version supports -40℃ to 85℃, with a high-temperature version available up to 105℃. Structurally, it offers both Flux proofed (suitable for clean environments) and Plastic sealed (resistant to H₂S, SO₂, and other pollutants, suitable for harsh environments) options. It supports various PCB pin layouts and offers an optional built-in hand control switch, balancing flexibility and convenience.

Safety Approvals and Standards

The W15L series has passed multiple international and domestic authoritative certifications, ensuring compliance and safety in global markets:

Typical Application Scenarios

Smart Home: Smart switches, smart sockets, home appliance control boards, smart meters.

Lighting Control: High-power LED drivers, commercial lighting systems, emergency lighting.

Industrial Control: Automation equipment and power management systems requiring high short-circuit withstand or manual control.

FAQ

Q1: What short-circuit current can the W15L relay withstand?

The W15L contacts can withstand a 750A 10ms short-circuit impulse current, effectively handling transient surges in the power grid and protecting downstream equipment.

Q2: What is a "latching" relay and what are its benefits?

A latching relay uses a permanent magnet to maintain the contact state. The coil only needs to be energized at the moment of "Set" or "Reset" (pulse width ≥5 times the operate time). Unlike standard relays, it does not rely on continuous current to maintain state, resulting in extremely low power consumption and minimal heat generation. This makes it ideal for power-sensitive applications such as smart meters.

Q3: What are the installation dimensions and weight of the product?

The W15L has outline dimensions of 29.0 × 12.7 × 16.0 mm and weighs approximately 15g. It offers multiple PCB pin layouts (Type 1, 2, 3, 5, 6) to accommodate different PCB design requirements.

Q4: How do I choose between "Plastic sealed" and "Flux proofed"?

According to the product datasheet:

Flux proofed: Suitable for clean environments (excluding H₂S, SO₂, NO₂, dust, and other pollutants).

Plastic sealed: Suitable for unclean environments (containing the above pollutants), providing better internal protection.