HFD4-I-4.5-LSR 4.5V SMD Latching High Load DPDT Relay 3A Gold Contacts

The HFD4-I-4.5-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, strong load capability, and minimal power consumption. Built with a Form 2C (DPDT / 2c/o) contact configuration, it allows independent switching of two circuits, making it highly suitable for dense PCB layouts and advanced control applications.

This relay operates with a 4.5VDC coil voltage and a 202 coil resistance, optimized for low-voltage electronic systems 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 state without continuous coil energization, significantly reducing overall system energy consumption.

Despite its compact SMD form factor, the HFD4-I-4.5-LSR supports a maximum switching current of 3A, with surge capability up to approximately 3.5A, making it suitable for both signal-level and moderate power applications. 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 systems.

The surface-mount sealed construction ensures strong protection against dust and environmental contamination while supporting automated PCB assembly processes. This makes it ideal for high-volume manufacturing and compact electronic designs where reliability and space efficiency are critical.

Its gold flash contacts provide low contact resistance, stable conductivity, and extended operational life, especially important in low-voltage switching applications where signal integrity is essential.

The relay design supports applications requiring compliance with IEC 60335-1 safety standards, making it suitable for systems that demand recognized safety and reliability performance.

Key Features

• Form 2C (DPDT / 2c/o) contact configuration
• Single-coil latching (bistable) operation
• 4.5VDC low-voltage coil design
• SMD surface-mount sealed construction
• High-load switching up to 3A
• Surge capability up to ~3.5A
• Very low power consumption (no holding power)
• Gold flash contacts for reliable performance
• Compact PCB-friendly design for automation
• IEC 60335-1 compliance suitability

Typical Applications

• Smart metering and utility devices
• Battery-powered control systems
• Industrial automation modules
• Embedded electronic control boards
• Energy-efficient switching systems
• High-density PCB designs

The HFD4-I-4.5-LSR combines latching efficiency, sealed SMD reliability, and high-load switching capability, making it an excellent choice for engineers designing compact, durable, and energy-efficient electronic control systems.

What's in the box
1 x HFD4-I-4.5-LSR 4.5V SMD Latching High Load DPDT Relay 3A Gold Contacts