MY4H-US AC12 Equivalent & Substitute Parts

Part Overview

The MY4H-US AC12 is a general purpose relay manufactured by Omron Automation and Safety, featuring a 4PDT (4 Form C) contact configuration with a 12VAC coil and 3A contact rating. This socketable relay is designed for general industrial switching applications with hermetically sealed construction.

The MY4H-US AC12 is classified as obsolete. Identifying suitable substitute parts is necessary to maintain system functionality and ensure continued availability for replacement and new designs. The substitute identified maintains functional equivalence while offering active product status and extended operational parameters.

Substiute Parts

MY4H-US AC12

Omron Automation and SafetyIn Stock: 1158MY4H-US AC12 Datasheet

Current PartRFQ

MY4 AC12 (S)

Omron Automation and SafetyIn Stock: 1247MY4 AC12 (S) Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MY4H-US AC12 is based on strict equivalence of the following critical parameters:

• Contact form: 4PDT (4 Form C) configuration
• Coil voltage: 12VAC
• Contact rating: 3A minimum
• Mounting type: Socketable with plug-in termination
• Coil type: Non-latching operation
• Voltage thresholds: Must operate at 9.6 VAC minimum, must release at 3.6 VAC maximum
• Switching timing: 20 ms operate and release times
• Contact material: Silver-based composition
• Compliance: RoHS compliant

The MY4 AC12 (S) meets all these criteria and qualifies as a direct functional substitute.

Parameter Comparison

Engineering Selection Recommendations

The MY4 AC12 (S) is the qualified substitute for the obsolete MY4H-US AC12. Both parts are manufactured by Omron Automation and Safety and maintain identical functional specifications for contact configuration, coil voltage, current rating, and switching timing.

The MY4 AC12 (S) offers the following advantages:

• Active product status ensures ongoing availability and supply chain continuity
• Extended operating temperature range (-55°C to 70°C versus -25°C to 60°C) provides broader environmental compatibility
• Increased maximum switching voltage rating (250VAC versus 125VAC) expands application flexibility
• RoHS compliance maintained across both parts
• Identical socketable mounting and plug-in termination for direct mechanical compatibility

Selection of the MY4 AC12 (S) is appropriate for all applications currently using the MY4H-US AC12, with the extended temperature range and higher switching voltage providing additional operational margin.

Frequently Asked Questions (FAQ)

Q: Can the MY4 AC12 (S) directly replace the MY4H-US AC12 in existing applications?

A: Yes. Both relays share identical contact form (4PDT), coil voltage (12VAC), current rating (3A), mounting type (socketable), and switching timing (20 ms). The socketable design and plug-in termination ensure mechanical and electrical compatibility.

Q: What is the difference in switching voltage ratings between these parts?

A: The MY4H-US AC12 is rated for 125VAC and 125VDC maximum switching voltage. The MY4 AC12 (S) is rated for 250VAC and 125VDC maximum switching voltage. The higher rating of the substitute provides additional operational margin for high-voltage switching applications.

Q: Are there temperature range differences between the parts?

A: Yes. The MY4H-US AC12 operates from -25°C to 60°C. The MY4 AC12 (S) operates from -55°C to 70°C. The extended range of the substitute accommodates broader environmental conditions.

Q: What packaging differences exist between these parts?

A: The MY4H-US AC12 is supplied with standard packaging. The MY4 AC12 (S) is supplied in bulk packaging. Both are suitable for component selection; packaging choice depends on procurement and inventory requirements.

Q: Are both parts RoHS compliant?

A: Yes. Both the MY4H-US AC12 and MY4 AC12 (S) are RoHS compliant and meet environmental regulatory requirements.

Q: Why is the MY4H-US AC12 classified as obsolete?

A: Obsolete status indicates the part is no longer in active production. The MY4 AC12 (S) is the active equivalent and is recommended for new designs and replacement applications.