Omron MY4-AC24 General Purpose Relay - Equivalent & Substitute Parts

Part Overview

The Omron MY4-AC24 is a general purpose 4PDT (4 Form C) relay with 24VAC coil voltage and 3A contact rating, designed for socketable mounting applications. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new designs. The MY4-AC24 operates with 46mA coil current, 20ms operate/release times, and supports switching voltages up to 250VAC and 125VDC maximum.

Substiute Parts

MY4-AC24

Omron Automation and SafetyIn Stock: 943MY4-AC24 Datasheet

Current PartRFQ

MY4 AC24 (S)

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

DirectRFQ

MY4Z AC24 (S)

Omron Automation and SafetyIn Stock: 753MY4Z AC24 (S) Datasheet

Parametric EquivalentRFQ

KHAU-17A11-24

TE Connectivity Potter & Brumfield RelaysIn Stock: 1134KHAU-17A11-24 Datasheet

SimilarRFQ

KHAU-17A12-24

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

SimilarRFQ

PT570524

TE Connectivity Potter & Brumfield RelaysIn Stock: 1178PT570524 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MY4-AC24 are classified based on the following critical parameters that determine functional compatibility:

Direct Equivalent (Identical Electrical and Mechanical Specifications):

• Coil voltage: 24VAC
• Contact form: 4PDT (4 Form C)
• Contact rating: 3A minimum
• Mounting type: Socketable
• Termination style: Plug In
• Operating temperature range: -55°C to 70°C minimum
• Must operate voltage: 19.2 VAC
• Must release voltage: 7.2 VAC

Parametric Equivalent (Same electrical function, minor specification variations allowed):

• Coil voltage: 24VAC
• Contact form: 4PDT (4 Form C)
• Mounting type: Socketable
• Termination style: Plug In
• Contact rating: 3A or higher
• Operating temperature range: -45°C to 70°C minimum

Similar Parts (Same contact form and coil voltage, higher current ratings or different contact materials):

• Coil voltage: 24VAC
• Contact form: 4PDT (4 Form C)
• Mounting type: Socketable
• Contact rating: 5A or 6A (suitable for applications requiring higher current capacity)

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Obsolete Part Elimination): Select MY4 AC24 (S) or MY4Z AC24 (S) from Omron. Both parts are active products with identical electrical specifications to the MY4-AC24, including 3A contact rating, 24VAC coil voltage, 4PDT contact form, and socketable mounting. Both are RoHS compliant, addressing regulatory requirements for new designs and procurement.

For Higher Current Applications: KHAU-17A12-24 (5A rating) or PT570524 (6A rating) are suitable when the application requires contact ratings exceeding 3A. Both maintain 24VAC coil voltage, 4PDT contact form, and socketable mounting. KHAU-17A12-24 is ROHS3 compliant. PT570524 includes mechanical indicator and test button features with ROHS3 compliance.

For Extended Temperature Range: The MY4-AC24 operates from -55°C to 70°C. Substitute parts from TE Connectivity (KHAU series and PT570524) operate from -40°C to -45°C minimum, which may not be suitable for applications requiring the full -55°C lower temperature limit.

For Regulatory Compliance: MY4 AC24 (S) and MY4Z AC24 (S) are RoHS compliant. KHAU-17A11-24 is RoHS non-compliant and should not be selected for new designs subject to RoHS requirements. KHAU-17A12-24 and PT570524 are ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q: Can MY4 AC24 (S) directly replace MY4-AC24? A: Yes. MY4 AC24 (S) is a direct equivalent with identical electrical and mechanical specifications, including 3A contact rating, 24VAC coil voltage, 4PDT contact form, socketable mounting, and plug-in termination. The primary difference is product status: MY4-AC24 is obsolete while MY4 AC24 (S) is active.

Q: What is the difference between MY4Z AC24 (S) and MY4 AC24 (S)? A: Both parts are parametric equivalents with identical electrical specifications. The difference lies in the base product number designation (MY4Z versus MY4), but all critical parameters including coil voltage, contact form, current rating, and operating characteristics are identical.

Q: Can KHAU-17A11-24 replace MY4-AC24 in all applications? A: KHAU-17A11-24 maintains the same 3A contact rating, 24VAC coil voltage, and 4PDT contact form. However, it has a higher must-operate voltage (20.4 VAC versus 19.2 VAC), faster switching times (13ms operate, 6ms release versus 20ms each), and operates only to -45°C (versus -55°C). It is also RoHS non-compliant. Verify application requirements before substitution.

Q: When should KHAU-17A12-24 or PT570524 be selected? A: These parts are suitable when the application requires higher contact current ratings (5A or 6A respectively) while maintaining 24VAC coil voltage and 4PDT contact form. Both are active products with RoHS compliance. PT570524 includes mechanical indicator and test button features.

Q: What packaging options are available? A: MY4-AC24, MY4 AC24 (S), MY4Z AC24 (S), and PT570524 are supplied in bulk packaging. KHAU-17A11-24 and KHAU-17A12-24 are supplied in tray packaging. Verify packaging requirements for procurement and assembly processes.

Q: Are there temperature range limitations when substituting? A: Yes. The MY4-AC24 operates from -55°C to 70°C. TE Connectivity substitutes (KHAU series) operate from -45°C minimum, and PT570524 operates from -40°C minimum. Applications requiring full -55°C operation must use Omron MY4 AC24 (S) or MY4Z AC24 (S).

Q: What is the coil resistance difference between substitutes? A: MY4-AC24, MY4 AC24 (S), and MY4Z AC24 (S) have 180 Ohm coil resistance. KHAU-17A11-24 and KHAU-17A12-24 have 160 Ohm coil resistance. PT570524 has 192 Ohm coil resistance. Verify circuit design compatibility when coil resistance differs.