HC4-H-AC24V Equivalent & Substitute Parts

Part Overview

The HC4-H-AC24V is a general purpose relay manufactured by Panasonic Electric Works, featuring a 4PDT (4 Form C) contact configuration with 24VAC coil voltage and 5A contact rating. This socketable relay is designed for general switching applications requiring multiple independent circuits. The product is currently obsolete, making equivalent and substitute parts necessary for system maintenance, repair, and redesign applications. Substitute relays must maintain compatibility with the socketable mounting interface and preserve the core electrical switching characteristics.

Substiute Parts

HC4-H-AC24V

Panasonic Electric WorksIn Stock: 1006HC4-H-AC24V Datasheet

Current PartRFQ

MY4 AC24 (S)

Omron Automation and SafetyIn Stock: 913MY4 AC24 (S) Datasheet

DirectRFQ

7760056083

WeidmüllerIn Stock: 11107760056083 Datasheet

SimilarRFQ

KHAU-17A12-24

TE Connectivity Potter & Brumfield RelaysIn Stock: 1185KHAU-17A12-24 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the HC4-H-AC24V is determined by the following mandatory parameters:

• Coil voltage: 24VAC (exact match required)
• Contact form: 4PDT (4 Form C) (exact match required)
• Mounting type: Socketable (exact match required)
• Termination style: Plug In (exact match required)
• Coil type: Non Latching (exact match required)
• Must operate voltage: 19.2 VAC minimum (exact match or better required)
• Must release voltage: 7.2 VAC maximum (exact match or better required)
• Operate and release time: 20 ms (compatibility within switching application tolerance)

Contact rating (current) may vary within application limits. Switching voltage and operating temperature range may differ provided they meet or exceed the original specification. All substitute parts must maintain socketable compatibility and plug-in termination for direct replacement capability.

Parameter Comparison

Engineering Selection Recommendations

All three substitute parts meet the mandatory substitution criteria for coil voltage, contact form, mounting type, and termination style. Selection among these alternatives depends on application-specific requirements:

MY4 AC24 (S) by Omron is suitable for applications where contact current does not exceed 3A. This part is RoHS Compliant and Active in production, ensuring long-term availability. Operating temperature range extends to -55°C, providing enhanced low-temperature performance.

7760056083 by Weidmüller is appropriate for applications requiring higher contact current capacity (10A). This part is RoHS Compliant and Active in production. Note that the operating temperature range is limited to -40°C ~ 55°C, which is narrower than the original specification.

KHAU-17A12-24 by TE Connectivity Potter & Brumfield Relays matches the original 5A contact rating and is ROHS3 Compliant. This part is Active in production. Operating time is faster (13 ms) and release time is faster (6 ms) compared to the original 20 ms specification. The must operate voltage is slightly higher at 20.4 VAC.

Frequently Asked Questions (FAQ)

Q: Can MY4 AC24 (S) replace HC4-H-AC24V in all applications?

A: MY4 AC24 (S) is suitable only for applications where the maximum contact current does not exceed 3A. The original HC4-H-AC24V is rated for 5A. If your application requires 5A switching capacity, use KHAU-17A12-24 or 7760056083 instead.

Q: What is the difference between the three substitute parts?

A: The primary differences are contact current rating (MY4 AC24 (S): 3A, KHAU-17A12-24: 5A, 7760056083: 10A), operating temperature range, and switching time characteristics. All three maintain the required 24VAC coil voltage, 4PDT contact form, and socketable mounting.

Q: Are all substitute parts socketable and plug-in compatible?

A: Yes. All three substitute parts feature socketable mounting and plug-in termination, enabling direct replacement in existing relay sockets without modification.

Q: Which substitute part has the best long-term availability?

A: All three substitute parts are currently Active in production status, ensuring availability. Omron MY4 AC24 (S), Weidmüller 7760056083, and TE Connectivity KHAU-17A12-24 are all established industrial relay products with active manufacturer support.

Q: Does operating temperature range affect substitution eligibility?

A: Operating temperature range does not prevent substitution if the substitute part's range meets or exceeds your application requirements. If your system operates below -40°C, 7760056083 by Weidmüller is not suitable. For applications below -50°C, only MY4 AC24 (S) and KHAU-17A12-24 are appropriate.

Q: What is the impact of different switching times?

A: KHAU-17A12-24 has faster switching times (13 ms operate, 6 ms release) compared to the original 20 ms. This faster response may be beneficial in time-critical applications but does not prevent substitution in standard switching applications.

Q: Are there RoHS compliance considerations?

A: All three substitute parts are RoHS Compliant or ROHS3 Compliant, meeting current environmental regulations. The original HC4-H-AC24V RoHS status is not specified.