The HFD3/5-4(257) is a miniature signal relay manufactured by HongFa. This relay is designed for low-level signal switching applications where small size and low power consumption are critical. It is commonly used in telecommunications, instrumentation, and other sensitive electronic circuits.

Applications:

• Telecommunications equipment
• Instrumentation and measurement devices
• Data acquisition systems
• Security systems
• Medical equipment

Features:

• Miniature size for high-density mounting
• Contact form: 4PDT (Four Pole Double Throw)
• Contact rating: 0.5A at 125VAC / 2A at 30VDC
• Coil voltage: 5VDC
• Low coil power consumption
• Sealed construction available
• RoHS compliant

Benefits:

• Compact size allows for high-density mounting on printed circuit boards.
• Low coil power consumption minimizes energy consumption in battery-powered devices.
• 4PDT contact configuration provides versatile switching options.
• Reliable switching performance ensures accurate signal transmission.
• RoHS compliance ensures environmental responsibility.

Additional Details:

The HFD3 series relays are designed for signal-level switching. The '/5' indicates a 5VDC coil voltage. The '-4' specifies a 4PDT contact configuration. The '(257)' may denote a production batch or internal tracking code. These relays often feature gold-plated contacts to ensure low contact resistance and reliable switching of low-level signals. Signal relays are designed to switch low voltage and current signals with minimal distortion.

Technical Specifications:

Contact Resistance: 50 mOhm (max)
Operate Time: 5ms (max)
Release Time: 3ms (max)
Insulation Resistance: 1000 MOhm (min) at 500VDC
Dielectric Strength: 500VAC between contacts; 1000VAC between coil and contacts
Operating Temperature: -40°C to +85°C
Weight: Approximately 2.5g