HC4D-HTM-AC24V Equivalent & Substitute Parts

Part Overview

The HC4D-HTM-AC24V is a general purpose relay manufactured by Panasonic Electric Works, featuring a 4PDT (4 Form C) contact configuration with a 24VAC coil and 3A contact rating. This relay is designed for chassis mount applications with plug-in, 14-pin termination. 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

HC4D-HTM-AC24V

Panasonic Electric WorksIn Stock: 1069HC4D-HTM-AC24V Datasheet

Current PartRFQ

MY4F AC24

Omron Automation and SafetyIn Stock: 1184MY4F AC24 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the HC4D-HTM-AC24V are identified based on the following critical parameters that determine functional equivalence:

• Coil voltage: 24VAC
• Contact configuration: 4PDT (4 Form C)
• Contact current rating: 3 A minimum
• Coil type: Non Latching
• Must operate and release voltage thresholds: 19.2 VAC and 7.2 VAC respectively
• Switching voltage capability: 250VAC minimum
• Operating temperature range compatibility

The MY4F AC24 from Omron Automation and Safety meets all these core substitution criteria, providing functional equivalence for applications requiring the HC4D-HTM-AC24V specification.

Parameter Comparison

Engineering Selection Recommendations

The MY4F AC24 is the active substitute for the obsolete HC4D-HTM-AC24V. Both relays share identical electrical specifications for coil voltage, contact configuration, current rating, and switching characteristics. The MY4F AC24 offers the advantage of active product status with RoHS compliance and REACH unaffected certification, ensuring long-term availability and regulatory alignment.

The primary consideration for substitution is the termination style difference: the HC4D-HTM-AC24V uses plug-in, 14-pin termination, while the MY4F AC24 uses solder lug termination. This requires mechanical adaptation in the application circuit or PCB design. The MY4F AC24 also provides extended operating temperature range (-55°C versus -50°C minimum) and dual voltage switching capability (250VAC and 125VDC), offering enhanced flexibility for various application environments.

Frequently Asked Questions (FAQ)

Q: Can the MY4F AC24 directly replace the HC4D-HTM-AC24V without modification?

A: Electrical substitution is valid. However, termination style differs: the HC4D-HTM-AC24V uses plug-in, 14-pin connectors while the MY4F AC24 uses solder lugs. Mechanical adaptation of the mounting interface is required.

Q: Are the coil resistance values different between these relays?

A: Yes. The HC4D-HTM-AC24V has 480 Ohms coil resistance while the MY4F AC24 has 180 Ohms. Both achieve the same 24VAC coil voltage specification with coil currents of 50 mA and 46 mA respectively, maintaining functional equivalence in 24VAC circuits.

Q: What is the impact of the extended operating temperature range in the MY4F AC24?

A: The MY4F AC24 operates from -55°C to 70°C compared to the HC4D-HTM-AC24V range of -50°C to 70°C. This provides additional margin for low-temperature applications, though both relays cover standard industrial temperature ranges.

Q: Does the MY4F AC24 support both AC and DC switching?

A: The MY4F AC24 switching voltage rating is 250VAC and 125VDC maximum, providing dual-voltage capability. The HC4D-HTM-AC24V is rated for 250VAC maximum. Both are suitable for AC applications; the MY4F AC24 offers additional DC switching capability.

Q: Is RoHS compliance a factor in selecting the MY4F AC24?

A: The MY4F AC24 is RoHS compliant with REACH unaffected status. The HC4D-HTM-AC24V compliance status is not specified. For applications requiring regulatory compliance documentation, the MY4F AC24 provides certified compliance.