HC4ED-HTM-AC24V Equivalent & Substitute Parts

Part Overview

The HC4ED-HTM-AC24V is a general purpose relay manufactured by Panasonic Electric Works, featuring a 4PDT (4 Form C) contact configuration with 1 A contact rating and 24VAC coil voltage. This socketable relay is designed for general-purpose switching applications with non-latching operation. The product is currently obsolete, making identification of suitable substitute components essential for system maintenance, repair, and redesign applications where continued functionality is required.

Substiute Parts

HC4ED-HTM-AC24V

Panasonic Electric WorksIn Stock: 782HC4ED-HTM-AC24V Datasheet

Current PartRFQ

MY4F AC24

Omron Automation and SafetyIn Stock: 1184MY4F AC24 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HC4ED-HTM-AC24V is determined by strict alignment of the following critical parameters:

Contact Configuration & Rating: The substitute must maintain 4PDT (4 Form C) contact form with contact current rating equal to or greater than 1 A to ensure equivalent switching capability.

Coil Specifications: The substitute must operate at 24VAC coil voltage with must-operate voltage of 19.2 VAC and must-release voltage of 7.2 VAC to ensure compatibility with existing control circuits.

Switching Capability: The substitute must support 250VAC switching voltage minimum to maintain electrical safety margins in the application.

Coil Type & Operation: Non-latching coil type is required to preserve the momentary switching behavior of the original component.

Operating Conditions: The substitute must function within the specified operating temperature range and maintain equivalent response times (operate and release times of 20 ms).

The MY4F AC24 (Omron Automation and Safety) meets these substitution criteria. While it features a higher contact rating (3 A versus 1 A) and different mounting type (chassis mount versus socketable), these represent functional improvements and do not prevent substitution. The higher contact rating provides additional safety margin, and chassis mount termination is compatible with circuit board integration where the original socketable design was used.

Parameter Comparison

Engineering Selection Recommendations

The MY4F AC24 is the identified substitute for the obsolete HC4ED-HTM-AC24V. Selection is based on the following engineering criteria:

Product Status: The HC4ED-HTM-AC24V is obsolete, creating supply chain risk. The MY4F AC24 is active and maintains current manufacturing status, ensuring long-term availability.

Functional Equivalence: Both relays maintain identical coil voltage (24VAC), must-operate voltage (19.2 VAC), must-release voltage (7.2 VAC), and response times (20 ms operate/release). This ensures direct functional compatibility in control circuits.

Contact Configuration: Both relays feature 4PDT (4 Form C) contact configuration. The MY4F AC24 provides higher contact current rating (3 A versus 1 A), which represents a functional improvement and does not compromise compatibility.

Compliance & Certifications: The MY4F AC24 is RoHS Compliant and REACH Unaffected, meeting modern regulatory requirements. Both components share identical ECCN (EAR99) and HTSUS (8536.41.0020) classifications.

Mounting Consideration: The HC4ED-HTM-AC24V uses socketable (plug-in) mounting, while the MY4F AC24 uses chassis mount with solder lug termination. Circuit board redesign or adapter solutions may be required depending on the application's mechanical constraints.

Frequently Asked Questions (FAQ)

Q: Can the MY4F AC24 directly replace the HC4ED-HTM-AC24V without circuit modification?

A: Electrical compatibility is direct. Both relays operate at 24VAC with identical coil thresholds and response times. Mechanical integration requires evaluation: the HC4ED-HTM-AC24V uses socketable mounting while the MY4F AC24 uses solder lug termination. Circuit board layout modification or mechanical adapter may be necessary.

Q: Why does the MY4F AC24 have a higher contact current rating (3 A versus 1 A)?

A: Higher contact rating represents a functional improvement that does not prevent substitution. The MY4F AC24 can safely handle all switching loads that the HC4ED-HTM-AC24V was designed for, with additional safety margin.

Q: Are the coil current specifications compatible?

A: Yes. The HC4ED-HTM-AC24V requires 50 mA coil current while the MY4F AC24 requires 46 mA. Both values are within typical control circuit supply capabilities and represent negligible difference in practical application.

Q: What is the impact of different contact materials?

A: The HC4ED-HTM-AC24V uses Silver Nickel (AgNi) and Gold (Au) contacts, while the MY4F AC24 uses Silver (Ag) contacts. Both contact materials are suitable for general-purpose switching applications at the specified voltage and current ratings.

Q: Does the wider operating temperature range of the MY4F AC24 affect compatibility?

A: The MY4F AC24 operates from -55°C to 70°C, compared to -40°C to 60°C for the HC4ED-HTM-AC24V. The wider range represents a functional improvement and does not create compatibility issues for applications within the original temperature specification.

Q: Are there regulatory or compliance differences between these relays?

A: Both relays share identical ECCN (EAR99) and HTSUS (8536.41.0020) classifications. The MY4F AC24 is RoHS Compliant and REACH Unaffected, meeting current regulatory standards. The HC4ED-HTM-AC24V, being obsolete, may not carry current compliance certifications.