HC3-H-AC115V Equivalent & Substitute Parts

Part Overview

The HC3-H-AC115V is a general purpose relay manufactured by Panasonic Electric Works, featuring a 3PDT (3 Form C) contact configuration with a 115VAC coil. This socketable relay is rated for 7A at 250VAC maximum switching voltage and operates with non-latching coil type. The product is currently obsolete, making equivalent substitute parts necessary for system maintenance, repair, and new design implementations where this relay specification is required.

Substiute Parts

HC3-H-AC115V

Panasonic Electric WorksIn Stock: 926HC3-H-AC115V Datasheet

Current PartRFQ

MY3-AC110/120

Omron Automation and SafetyIn Stock: 871MY3-AC110/120 Datasheet

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PT370615

TE Connectivity Potter & Brumfield RelaysIn Stock: 899PT370615 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the HC3-H-AC115V are qualified based on the following critical parameters:

Primary Compatibility Criteria:

• Contact form must be 3PDT (3 Form C)
• Coil voltage must be compatible with 115VAC nominal operation (acceptable range: 110-120VAC)
• Mounting type must be socketable with plug-in termination
• Coil type must be non-latching
• Contact rating must meet or exceed 7A minimum requirement
• Switching voltage capability must support 250VAC or higher

Identified Substitutes:

1. MY3-AC110/120 (Omron Automation and Safety) – Active product status, 120VAC coil, 5A contact rating, socketable, plug-in termination, 3PDT configuration
2. PT370615 (TE Connectivity Potter & Brumfield Relays) – Active product status, 115VAC coil, 10A contact rating, socketable, plug-in termination, 3PDT configuration with mechanical indicator and test button

Parameter Comparison

Engineering Selection Recommendations

PT370615 (TE Connectivity Potter & Brumfield Relays) is the primary substitute for HC3-H-AC115V applications. This part maintains exact coil voltage specification (115VAC), exceeds the contact current rating (10A vs. 7A), and provides superior switching voltage capability (400VAC vs. 250VAC). PT370615 is an active product with ROHS3 compliance and includes mechanical indicator and test button features. The operating temperature range (-40°C ~ 70°C) is suitable for most industrial applications, though it does not extend to the lower -50°C limit of the original part.

MY3-AC110/120 (Omron Automation and Safety) serves as an alternative substitute where coil voltage tolerance of ±5% is acceptable. This part operates at 120VAC nominal, within the acceptable range for 115VAC-specified circuits. The contact rating of 5A is lower than the original 7A specification and should be evaluated against actual circuit load requirements. MY3-AC110/120 offers extended lower temperature operation (-55°C) and RoHS compliance. This substitute is suitable for applications where contact current demand does not exceed 5A.

Both substitutes maintain socketable mounting with plug-in termination, ensuring mechanical compatibility with existing relay bases. Selection between PT370615 and MY3-AC110/120 depends on specific circuit current requirements and temperature operating envelope.

Frequently Asked Questions (FAQ)

Q: Can MY3-AC110/120 be used in place of HC3-H-AC115V if the circuit operates at 115VAC?

A: MY3-AC110/120 is rated for 120VAC coil voltage. In circuits operating at 115VAC nominal, the relay will receive approximately 96% of rated coil voltage, which exceeds the specified must-operate voltage of 96VAC. However, the contact rating of 5A is lower than HC3-H-AC115V's 7A rating. Use MY3-AC110/120 only if circuit current does not exceed 5A.

Q: Is PT370615 a direct replacement for HC3-H-AC115V?

A: PT370615 is functionally equivalent for most applications. Both relays operate at 115VAC coil voltage, feature 3PDT contact configuration, and use socketable plug-in termination. PT370615 provides higher contact current rating (10A vs. 7A) and superior switching voltage capability (400VAC vs. 250VAC). The operating temperature range differs: PT370615 operates from -40°C to 70°C, while HC3-H-AC115V extends to -50°C. Verify temperature requirements for your specific application.

Q: What is the significance of the socketable mounting type?

A: Socketable mounting indicates the relay is designed for use with a relay base or socket. Both substitute parts maintain this mounting type with plug-in termination, ensuring compatibility with existing HC3-H-AC115V relay bases without modification.

Q: How do contact ratings affect substitution?

A: Contact rating specifies the maximum current the relay contacts can safely switch. HC3-H-AC115V is rated for 7A. PT370615 (10A) exceeds this requirement and is suitable for all applications. MY3-AC110/120 (5A) is suitable only for applications where circuit current does not exceed 5A. Exceeding contact rating causes contact degradation and relay failure.

Q: Are there compliance differences between the original part and substitutes?

A: HC3-H-AC115V is an obsolete product with REACH Unaffected status. PT370615 is ROHS3 compliant and REACH Unaffected. MY3-AC110/120 is RoHS compliant. Both substitutes meet current regulatory requirements for new designs and replacements in regulated applications.

Q: What is the difference between 115VAC and 120VAC coil specifications?

A: Standard industrial AC supply voltage tolerates ±10% variation. 115VAC and 120VAC nominal ratings both operate within typical utility voltage ranges. MY3-AC110/120 at 120VAC nominal will operate correctly in 115VAC circuits, though at slightly reduced coil current. PT370615 at 115VAC nominal matches the original specification exactly.