HC3-DC24V-D-F Equivalent & Substitute Parts

Part Overview

The HC3-DC24V-D-F is a general purpose relay manufactured by Panasonic Electric Works, featuring a 3PDT (3 Form C) contact configuration with a 24VDC coil. This socketable relay is designed for applications requiring reliable switching of AC and DC loads. The product is currently obsolete, making equivalent substitute parts necessary for system maintenance, repair, and new design implementations where the original component is no longer available.

Substiute Parts

HC3-DC24V-D-F

Panasonic Electric WorksIn Stock: 1163HC3-DC24V-D-F Datasheet

Current PartRFQ

LY3-D-DC24

Omron Automation and SafetyIn Stock: 644LY3-D-DC24 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the HC3-DC24V-D-F are identified based on the following critical parameters that determine functional compatibility:

• Coil Voltage: Must be 24VDC to match control circuit requirements
• Contact Form: Must be 3PDT (3 Form C) to maintain switching topology
• Mounting Type: Must be socketable to ensure mechanical compatibility with existing relay bases
• Termination Style: Must be plug-in to match socket pin configuration
• Coil Type: Must be non-latching for identical operational behavior
• Features: Must include diode for coil protection
• Must Operate/Release Voltage: Must match 19.2 VDC / 2.4 VDC thresholds for control circuit compatibility

The LY3-D-DC24 from Omron Automation and Safety meets all these critical substitution criteria, making it a valid equivalent for the obsolete HC3-DC24V-D-F.

Parameter Comparison

Engineering Selection Recommendations

The LY3-D-DC24 is a direct functional equivalent for the obsolete HC3-DC24V-D-F. Both relays share identical coil voltage, contact configuration, mounting type, and control voltage thresholds, ensuring seamless substitution in existing applications.

The LY3-D-DC24 offers the following advantages:

• Active Product Status: Currently manufactured and readily available, eliminating supply chain risk
• RoHS Compliance: Meets environmental regulatory requirements for new designs and replacements
• Higher Current Rating: 10 A contact rating provides additional margin over the original 7 A specification
• Extended Switching Voltage Range: Supports both 250VAC and 125VDC switching, offering greater application flexibility

Minor differences exist in coil current (58.6 mA vs. 37 mA), switching speed (25 ms vs. 20 ms), and operating temperature range (-25°C ~ 55°C vs. -50°C ~ 70°C). These differences are acceptable for most general purpose relay applications where the original HC3-DC24V-D-F was deployed.

Frequently Asked Questions (FAQ)

Q: Can the LY3-D-DC24 be used as a direct replacement for the HC3-DC24V-D-F?

A: Yes. Both relays have identical coil voltage (24VDC), contact form (3PDT), mounting type (socketable), and control voltage thresholds (19.2 VDC operate / 2.4 VDC release). The LY3-D-DC24 will function identically in the same socket and control circuit.

Q: What are the key differences between these two relays?

A: The LY3-D-DC24 has a higher current rating (10 A vs. 7 A), slightly longer switching times (25 ms vs. 20 ms), higher coil current draw (58.6 mA vs. 37 mA), and a narrower operating temperature range (-25°C ~ 55°C vs. -50°C ~ 70°C). The LY3-D-DC24 is RoHS compliant, while the HC3-DC24V-D-F is not specified.

Q: Will the higher coil current of the LY3-D-DC24 affect my control circuit?

A: The coil current difference (58.6 mA vs. 37 mA) must be evaluated against your control circuit's current capacity. If your circuit was designed for the original 37 mA specification, verify that the control source can supply the additional 21.6 mA without exceeding voltage regulation limits.

Q: Are there any temperature limitations I should consider?

A: The LY3-D-DC24 operates from -25°C to 55°C, which is narrower than the HC3-DC24V-D-F range of -50°C to 70°C. If your application requires operation below -25°C or above 55°C, the LY3-D-DC24 may not be suitable.

Q: Does the socketable mounting ensure mechanical compatibility?

A: Yes. Both relays are socketable with plug-in termination, meaning they use the same relay base interface. Physical and electrical compatibility with existing relay sockets is assured.

Q: What is the significance of the higher 10 A current rating on the LY3-D-DC24?

A: The 10 A rating provides additional safety margin for applications originally designed for 7 A switching. This allows the relay to handle transient current spikes and provides headroom for future load increases without exceeding contact ratings.