HFD4-I-5-SR 5V SMD Monostable High Load DPDT Relay 3A Sealed Gold Contacts

The HFD4-I-5-SR is a subminiature sealed surface-mount (SMD) monostable high-load relay designed for compact electronic systems that require reliable switching performance, low power consumption, and strong load-handling capability in a space-efficient package. Featuring a Form 2C (DPDT / 2c/o) contact configuration, it enables independent control of two circuits, making it suitable for a wide range of control, automation, and signal routing applications.

This relay operates with a 5VDC coil voltage and a 178 coil resistance, optimized for low-voltage control systems where efficiency and stable operation are important. As a monostable (non-latching) relay, it remains energized only while the coil is powered and returns to its default state when power is removed, making it ideal for fail-safe operation, momentary switching, and automatic reset systems.

Despite its compact SMD footprint, the HFD4-I-5-SR 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, providing flexibility for AC and DC applications.

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

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

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

Key Features

• Form 2C (DPDT / 2c/o) contact configuration
• Monostable (non-latching) operation
• 5VDC low-voltage coil design
• SMD sealed surface-mount construction
• High-load switching up to 3A
• Surge capability up to ~3.5A
• Low power consumption
• Gold flash contacts for reliability
• Compact PCB-friendly design
• IEC 60335-1 compliance suitability

Typical Applications

• Industrial automation systems
• Embedded electronic modules
• Smart metering and utility devices
• Battery-powered control circuits
• Signal routing and interface switching
• Compact PCB control designs

The HFD4-I-5-SR delivers a strong balance of monostable reliability, sealed SMD durability, and high-load switching performance, making it ideal for engineers designing compact, efficient, and reliable electronic control systems.

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