HFD4-I-4.5-L 4.5V Sealed Latching High Load DPDT Relay 3A Gold Contacts

The HFD4-I-4.5-L is a subminiature sealed single-coil latching high-load relay designed for compact electronic systems that require reliable bistable switching, low power consumption, and strong load-handling capability in a small footprint. Featuring a Form 2C (DPDT / 2c/o) contact configuration, it enables independent control of two circuits, making it suitable for a wide range of industrial, automation, and embedded control applications.

This relay operates with a 4.5VDC coil voltage and a 202 coil resistance, optimized for low-voltage control environments where efficiency and stable operation are critical. 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 power consumption.

Despite its compact size, the HFD4-I-4.5-L supports a maximum switching current of 3A, with surge capability up to approximately 3.5A, allowing it to handle both signal-level loads and moderate power switching reliably. Electrical ratings include 3A at 30VDC and 1A at 125VAC, with a maximum switching voltage of 250VAC / 220VDC, making it suitable for both AC and DC circuit designs.

As a latching relay, it retains its switched position even after coil power is removed. This makes it ideal for energy-saving applications, memory-based switching circuits, and systems that require state retention during power loss or intermittent control signals.

The relay is built in a sealed subminiature package, providing strong protection against dust and environmental contaminants. This enhances long-term reliability and ensures stable performance in demanding industrial or embedded environments.

Its gold flash contacts provide low contact resistance, improved signal integrity, and long-term durability, especially in low-voltage switching applications where stable electrical performance is essential.

The design is suitable for applications requiring compliance with IEC 60335-1 safety standards, making it appropriate for systems where electrical safety and reliability are critical.

Key Features

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

Single-coil latching (bistable) operation

4.5VDC low-voltage coil design

High-load switching up to 3A

Surge current capability up to ~3.5A

Sealed subminiature construction

Extremely low power consumption (no holding power)

Gold flash contacts for reliable performance

Compact PCB-friendly design

IEC 60335-1 compliance suitability

Typical Applications

Battery-powered control systems

Smart metering and utility devices

Industrial automation and control panels

Embedded electronic modules

Energy-efficient switching systems

Memory-state or retention switching circuits

The HFD4-I-4.5-L delivers a strong combination of latching efficiency, sealed durability, and high-load switching performance, making it ideal for engineers designing compact, energy-efficient, and reliable electronic control systems.

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