12V Bistable Latching Relay DPDT HFD2 | 2A 30VDC 1A 125VAC

12V Coil Bistable Latching Relay – DPDT HFD2-005-S-L2-D

This compact 12V bistable latching relay (DPDT, 10-pin) is an ideal pick for electronics hobbyists, engineers, and DIY circuit builders who need a reliable, low-power switching component. Unlike standard relays, a bistable (latching) relay holds its switched state without continuous coil power — saving energy and reducing heat in your projects.

With a silver-gold alloy (Ag-AuAg8) contact material, ultra-fast 4ms operate / 3ms release times, and a wide operating temperature range of -40°C to +85°C, this relay performs consistently across a broad range of applications including automation circuits, microcontroller projects, and DIY home electronics.

Made in Mainland China.

Key Features

• Type: Bistable / Latching Relay – holds state without continuous coil power
• Contact Form: 2CO (DPDT – Double Pole Double Throw)
• Coil Voltage: 12V DC
• Contact Rating: 2A @ 30VDC & 1A @ 125VAC
• Contact Material: Ag-AuAg8 (Silver-Gold alloy) for low contact resistance & long life
• Pins: 10-pin through-hole configuration
• Operate / Release Time: 4ms / 3ms
• Coil Consumption: 150mW (low power draw)
• Temperature Range: -40°C to +85°C
• Compact Size: approx. 2 × 1 × 1 cm (0.79 × 0.39 × 0.39 inch)
• Material: Plastic housing + Metal contacts
• Color: White

Full Specifications

What's in the Box?

• 1 × HFD2-005-S-L2-D 12V Bistable Latching Relay

Common Applications

• Arduino / Raspberry Pi & microcontroller switching circuits
• DIY home automation and smart switch builds
• Battery-powered IoT devices requiring low standby power
• Telecommunications & signal routing equipment
• PCB prototyping and electronic project boards

For general safety guidelines when working with electrical components, refer to the U.S. Consumer Product Safety Commission – Electrical Safety.

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Important Notes

1. Product images are for illustration only — please refer to the written specifications for exact dimensions.
2. Minor measurement variations (±1–2mm) may occur due to manual measurement.
3. Color displayed may vary slightly depending on your monitor's calibration.

Frequently Asked Questions

Q: What does "bistable latching relay" mean, and why does it matter?

A: A bistable latching relay has two stable positions — it switches ON with a pulse and stays ON without needing continuous coil power. It only needs another pulse to switch OFF. This is perfect for battery-powered or energy-sensitive projects because the coil draws zero power between switching events, significantly reducing overall power consumption.

Q: What is DPDT and how many circuits can this relay switch?

A: DPDT stands for Double Pole Double Throw. This relay can simultaneously control two independent circuits, each with a common, normally-open (NO), and normally-closed (NC) connection — giving you flexible switching options in a single compact component.

Q: Is this relay compatible with Arduino or Raspberry Pi projects?

A: Yes. With a 12V coil and just 150mW coil consumption, this relay works well in microcontroller-driven circuits when paired with a suitable transistor or relay driver module to handle the coil switching from a 3.3V or 5V GPIO pin.

Q: What are the contact ratings, and can it switch mains voltage?

A: The contact is rated at 1A @ 125VAC and 2A @ 30VDC. While 125VAC is within the low-voltage range, always follow local electrical codes and safety standards when working with any AC circuit. This relay is best suited for low-current signal and control applications rather than high-load mains switching.