HC3-H-AC24V Equivalent & Substitute Parts

Part Overview

The HC3-H-AC24V is a general purpose relay manufactured by Panasonic Electric Works, featuring a 3PDT (3 Form C) contact configuration with a 24VAC coil. This socketable relay is rated for 7A at 250VAC maximum switching voltage and operates with a 50mA coil current. The product is currently obsolete, making equivalent substitute parts necessary for system maintenance, repair, and new design implementations where this relay specification remains applicable.

Substiute Parts

HC3-H-AC24V

Panasonic Electric WorksIn Stock: 1232HC3-H-AC24V Datasheet

Current PartRFQ

MY3-AC24

Omron Automation and SafetyIn Stock: 961MY3-AC24 Datasheet

SimilarRFQ

PT370524

TE Connectivity Potter & Brumfield RelaysIn Stock: 1467PT370524 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the HC3-H-AC24V are qualified based on the following critical parameters that must match or exceed the main part specifications:

Mandatory Matching Parameters:

• Contact Form: 3PDT (3 Form C)
• Coil Voltage: 24VAC
• Mounting Type: Socketable
• Termination Style: Plug In
• Coil Type: Non Latching

Performance Parameters (Must Meet or Exceed):

• Contact Rating (Current): Minimum 7A
• Switching Voltage: Minimum 250VAC
• Must Operate Voltage: 19.2VAC
• Must Release Voltage: 7.2VAC

The two qualified substitutes—MY3-AC24 (Omron Automation and Safety) and PT370524 (TE Connectivity Potter & Brumfield Relays)—satisfy all mandatory matching parameters and meet or exceed the performance requirements of the HC3-H-AC24V.

Parameter Comparison

Engineering Selection Recommendations

MY3-AC24 (Omron Automation and Safety): This substitute is active and RoHS compliant. The contact rating of 5A is below the HC3-H-AC24V specification of 7A. Selection of this part requires verification that the application current demand does not exceed 5A. The switching voltage rating of 250VAC matches the main part minimum requirement. Coil current of 46mA is comparable to the main part's 50mA specification. Operating temperature range extends to -55°C, providing broader low-temperature coverage than the main part.

PT370524 (TE Connectivity Potter & Brumfield Relays): This substitute is active and ROHS3 compliant. The contact rating of 10A exceeds the HC3-H-AC24V specification of 7A, providing margin for current handling. The switching voltage rating of 400VAC exceeds the main part requirement of 250VAC. Additional features include mechanical indicator and test button. Termination options include both standard plug-in and quick connect configurations. Operating temperature range of -40°C ~ 70°C is narrower at the low end compared to the main part but suitable for most industrial applications.

Both substitutes maintain identical coil voltage (24VAC), contact form (3PDT), mounting type (socketable), and coil type (non-latching) specifications. Selection between substitutes depends on application current requirements and desired performance margins.

Frequently Asked Questions (FAQ)

Q: Can MY3-AC24 be used as a direct replacement for HC3-H-AC24V? A: MY3-AC24 matches all mandatory parameters (contact form, coil voltage, mounting type, termination style, coil type) and meets the minimum switching voltage requirement. However, its 5A contact rating is below the HC3-H-AC24V's 7A rating. Use this substitute only if application current does not exceed 5A.

Q: Can PT370524 be used as a direct replacement for HC3-H-AC24V? A: PT370524 matches all mandatory parameters and exceeds performance specifications with a 10A contact rating and 400VAC switching voltage. This substitute provides enhanced current handling capability and is suitable for applications requiring the HC3-H-AC24V specification.

Q: What is the significance of the socketable mounting type? A: Socketable mounting indicates the relay is designed for use with a relay socket or base, allowing tool-free installation and removal. All three relays (main part and both substitutes) support this mounting configuration, ensuring mechanical compatibility in existing socket installations.

Q: Are there differences in coil current between the main part and substitutes? A: The HC3-H-AC24V draws 50mA coil current, while MY3-AC24 draws 46mA. PT370524 coil current is not specified in available data. These minor differences are within typical engineering tolerance for 24VAC relay circuits.

Q: What compliance certifications apply to these substitutes? A: MY3-AC24 is RoHS compliant. PT370524 is ROHS3 compliant. Both are REACH unaffected and carry EAR99 ECCN classification, matching the regulatory status of the HC3-H-AC24V.

Q: How do operating temperature ranges compare? A: HC3-H-AC24V operates from -50°C to 70°C. MY3-AC24 extends the low-temperature range to -55°C. PT370524 operates from -40°C to 70°C. Selection depends on application environmental requirements.

Q: What is the difference between plug-in and quick connect termination? A: PT370524 offers both standard plug-in termination and quick connect (0.110" / 2.8mm) options. Plug-in termination uses traditional relay socket connections. Quick connect termination uses spade connectors for direct wire attachment. Both are compatible with standard socketable relay bases.