The HFD4-I-5-LSR is a subminiature sealed surface-mount (SMD) single-coil latching high-load relay designed for compact, energy-efficient electronic systems requiring reliable bistable switching, low power consumption, and robust load-handling capability. Featuring a Form 2C (DPDT / 2c/o) contact configuration, it provides independent control of two circuits, making it suitable for industrial automation, smart control systems, and high-density PCB applications.

This relay operates with a 5VDC coil voltage and a 250 coil resistance, optimized for low-voltage control environments where efficiency and stable operation are essential. As a 1-coil latching (bistable) relay, it only consumes power during switching transitions and maintains its last switched state without continuous coil energization, significantly improving energy efficiency in battery-powered or low-power systems.

Despite its compact SMD design, the HFD4-I-5-LSR supports a maximum switching current of 3A, with surge capability up to approximately 3.5A, allowing it to handle both signal-level and moderate power loads reliably. Electrical ratings include 3A at 30VDC and 1A at 125VAC, with a maximum switching voltage of 250VAC / 220VDC, enabling flexible use across AC and DC circuits.

The sealed surface-mount construction protects internal contacts from dust and environmental contamination while supporting automated PCB assembly processes. This ensures long-term stability and makes it ideal for high-volume production and compact electronic designs.

Its gold flash contacts provide low contact resistance, stable conductivity, and long operational life, especially important in low-voltage switching applications where signal integrity and consistent performance are critical.

Designed in compliance with IEC 60335-1 safety standards, the relay is suitable for applications requiring recognized electrical safety and reliability performance.

Key Features

Form 2C (DPDT / 2c/o) contact configuration

Single-coil latching (bistable) operation

5VDC low-voltage coil design

SMD sealed surface-mount construction

High-load switching up to 3A

Surge capability up to ~3.5A

Extremely low power consumption (no holding power)

Gold flash contacts for reliability and durability

Compact PCB-friendly design

IEC 60335-1 compliance suitability

Typical Applications

Industrial automation systems

Smart metering devices

Battery-powered control circuits

Embedded electronic modules

Energy-efficient switching systems

High-density PCB designs

The HFD4-I-5-LSR combines latching efficiency, sealed SMD reliability, and high-load switching performance, making it ideal for engineers designing compact, power-efficient, and highly reliable electronic control systems.

What's in the box
1 x HFD4-I-5-LSR 5V SMD Latching High Load DPDT Relay 3A Sealed Gold Contacts