HG4-AC12V Equivalent & Substitute Parts

Part Overview

The HG4-AC12V is a general purpose relay manufactured by Panasonic Electric Works, featuring a 4PDT (4 Form C) contact configuration with a 12VAC coil and 20A contact rating. This socketable relay is designed for industrial control applications requiring multiple independent switching circuits. The product is currently obsolete, making equivalent substitute parts necessary for system maintenance, repair, and legacy equipment support.

Substiute Parts

HG4-AC12V

Panasonic Electric WorksIn Stock: 1104HG4-AC12V Datasheet

Current PartRFQ

PT570512

TE Connectivity Potter & Brumfield RelaysIn Stock: 1220PT570512 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the HG4-AC12V is evaluated based on the following critical parameters that must align for functional compatibility:

Essential Matching Parameters:

• Contact form: 4PDT (4 Form C) configuration
• Coil voltage: 12VAC
• Mounting type: Socketable
• Coil type: Non Latching
• Must operate voltage: 9.6 VAC minimum
• Must release voltage: 3.6 VAC maximum

Allowable Variation Parameters:

• Contact rating (current): May be equal to or greater than 20A
• Switching voltage: May be equal to or greater than 250VAC
• Operating temperature range: May be wider than -50°C ~ 40°C
• Termination connector size: Socketable plug-in types with compatible pin configurations
• Contact material composition: Silver-based alloys acceptable

The PT570512 qualifies as a substitute based on matching essential parameters. However, the contact rating of 6A is lower than the original 20A specification, which restricts its application to circuits with reduced current requirements.

Parameter Comparison

Engineering Selection Recommendations

The PT570512 is an active product manufactured by TE Connectivity Potter & Brumfield Relays and meets ROHS3 compliance requirements, providing a path forward from the obsolete HG4-AC12V. Both relays share identical coil voltage (12VAC), contact configuration (4PDT), and voltage threshold specifications (9.6VAC operate, 3.6VAC release).

Selection of the PT570512 as a substitute requires evaluation of application-specific current requirements. The 6A contact rating of the PT570512 is suitable for applications where circuit current does not exceed 6A. Applications requiring the full 20A capability of the original HG4-AC12V cannot use the PT570512 without circuit redesign or parallel relay configurations.

The connector size difference (0.250" versus 0.110") necessitates socket adapter verification or panel modification for direct mechanical replacement. The wider operating temperature range of the PT570512 (-40°C ~ 70°C) provides enhanced environmental flexibility compared to the original specification.

Frequently Asked Questions (FAQ)

Q: Can the PT570512 directly replace the HG4-AC12V in all applications?

A: Direct replacement is possible only in applications where the circuit current does not exceed 6A. The PT570512 contact rating is lower than the original 20A specification. Additionally, the connector size differs (0.110" versus 0.250"), requiring socket compatibility verification.

Q: What is the significance of the different termination connector sizes?

A: The HG4-AC12V uses 0.250" (6.3mm) quick-connect terminals, while the PT570512 uses 0.110" (2.8mm) terminals. These are not directly compatible. Mechanical replacement requires either socket adapters or panel rewiring to accommodate the different terminal configuration.

Q: Are the coil voltage thresholds identical between these relays?

A: Yes. Both relays operate at 12VAC with identical must-operate voltage (9.6VAC) and must-release voltage (3.6VAC) specifications, ensuring equivalent coil performance in 12VAC control circuits.

Q: What compliance advantages does the PT570512 offer?

A: The PT570512 is ROHS3 compliant and actively manufactured, whereas the HG4-AC12V is obsolete. This ensures long-term availability and compliance with current environmental regulations for new equipment designs or system upgrades.

Q: How do the contact materials compare?

A: The HG4-AC12V uses Silver Alloy contacts, while the PT570512 uses Silver Nickel (AgNi) contacts. Both are silver-based materials suitable for general-purpose switching applications with comparable electrical performance characteristics.

Q: Is the PT570512 suitable for the full temperature range of the original application?

A: The PT570512 operating range (-40°C ~ 70°C) is wider than the HG4-AC12V specification (-50°C ~ 40°C). If the original application operated below -40°C, the PT570512 may not be suitable without thermal analysis of the specific operating environment.