HC4-HP-AC24V Equivalent & Substitute Parts

Part Overview

The HC4-HP-AC24V is a general purpose relay manufactured by Panasonic Electric Works, featuring a 4PDT (4 Form C) contact configuration with a 24VAC coil. This through-hole mounted relay is rated for 5A at 250VAC maximum switching voltage and operates with 50mA coil current. The product is currently obsolete, making equivalent substitute parts necessary for ongoing maintenance, repair, and new design implementations where this relay specification remains applicable.

Substiute Parts

HC4-HP-AC24V

Panasonic Electric WorksIn Stock: 960HC4-HP-AC24V Datasheet

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LY4-0 AC24

Omron Automation and SafetyIn Stock: 1096LY4-0 AC24 Datasheet

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MY4-02-AC24

Omron Automation and SafetyIn Stock: 724MY4-02-AC24 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the HC4-HP-AC24V are qualified based on the following critical parameters that must match or exceed the original specification:

Mandatory Matching Parameters:

• Contact Form: 4PDT (4 Form C)
• Coil Voltage: 24VAC
• Mounting Type: Through Hole
• Termination Style: PC Pin
• Coil Type: Non Latching
• Must Operate Voltage: 19.2 VAC minimum
• Must Release Voltage: 7.2 VAC maximum

Allowable Substitution Criteria:

• Contact Rating (Current): Must be equal to or greater than 5A
• Switching Voltage: Must support 250VAC or higher
• Operating Temperature Range: Must encompass or exceed -50°C ~ 70°C
• Operate/Release Time: May vary within acceptable control circuit tolerances

The two qualified substitutes (LY4-0 AC24 and MY4-02-AC24) meet all mandatory parameters. The LY4-0 AC24 provides higher current capacity (10A), while the MY4-02-AC24 maintains the original 5A rating with extended temperature range capability.

Parameter Comparison

Engineering Selection Recommendations

LY4-0 AC24 (Omron Automation and Safety)

The LY4-0 AC24 is an active product with RoHS compliance certification. It exceeds the HC4-HP-AC24V current rating at 10A versus 5A, providing design margin for higher load applications. The substitute supports both 250VAC and 125VDC switching voltages. Operating temperature range is -25°C ~ 40°C, which is narrower than the original specification. Coil current requirement is 80mA compared to the original 50mA. This substitute is suitable for applications where the narrower temperature range is acceptable and higher current capacity is beneficial or neutral.

MY4-02-AC24 (Omron Automation and Safety)

The MY4-02-AC24 is an active product with ROHS3 compliance and REACH unaffected status. Contact rating is 3A, which is lower than the original 5A specification. Operating temperature range is -55°C ~ 70°C, exceeding the original range. Coil current is 46mA, closely matching the original 50mA. Operate and release times match the original at 20ms each. This substitute is suitable for applications where the 3A current rating is sufficient and extended low-temperature operation is required.

Frequently Asked Questions (FAQ)

Q: Can the LY4-0 AC24 directly replace the HC4-HP-AC24V in all applications?

A: The LY4-0 AC24 meets all mandatory electrical parameters for substitution. However, the operating temperature range is limited to -25°C ~ 40°C versus the original -50°C ~ 70°C. Applications requiring operation below -25°C or above 40°C require evaluation. The higher coil current (80mA vs 50mA) must be verified against the control circuit power supply capacity.

Q: Why does the MY4-02-AC24 have a lower current rating (3A) than the original (5A)?

A: The MY4-02-AC24 is a different relay series within the Omron product line. While it meets all mandatory substitution criteria including contact form, coil voltage, and control voltage thresholds, the contact rating is 3A. This substitute is appropriate only for applications where the load current does not exceed 3A.

Q: Are there any compliance differences between the substitutes?

A: The LY4-0 AC24 carries RoHS Compliant certification. The MY4-02-AC24 carries ROHS3 Compliant certification and REACH Unaffected status. Both are active products from Omron Automation and Safety, whereas the original HC4-HP-AC24V is obsolete.

Q: What is the impact of different coil currents on circuit design?

A: The HC4-HP-AC24V requires 50mA coil current. The LY4-0 AC24 requires 80mA, and the MY4-02-AC24 requires 46mA. The control circuit power supply and driver circuitry must be capable of supplying the coil current of the selected substitute. Higher coil current increases power dissipation and may require larger power supply capacity.

Q: Can these relays be used interchangeably on the same PCB?

A: All three relays use through-hole PC pin termination and 4PDT contact configuration. Physical footprint compatibility must be verified against the original PCB design. Pin spacing and overall relay dimensions should be confirmed with manufacturer datasheets before PCB reuse.

Q: What are the operating voltage thresholds for these relays?

A: All three relays share identical must-operate and must-release voltage specifications: 19.2VAC minimum to operate and 7.2VAC maximum to release. This ensures consistent control circuit behavior across substitutes.