Omron MY3-AC220/240 General Purpose Relay - Equivalent & Substitute Parts

Part Overview

The Omron MY3-AC220/240 is an active general purpose relay featuring a 3PDT (3 Form C) contact configuration with a 240VAC coil. This socketable relay is designed for applications requiring reliable switching of up to 5A at 250VAC or 125VDC. The part is RoHS compliant and maintains unlimited moisture sensitivity rating (MSL 1), making it suitable for standard industrial control applications. Substitute parts may be required due to inventory constraints, application-specific feature requirements, or regional availability considerations.

Substiute Parts

MY3-AC220/240

Omron Automation and SafetyIn Stock: 1057MY3-AC220/240 Datasheet

Current PartRFQ

PT370730

TE Connectivity Potter & Brumfield RelaysIn Stock: 1164PT370730 Datasheet

DirectRFQ

KHAU-17A12-240

TE Connectivity Potter & Brumfield RelaysIn Stock: 1362KHAU-17A12-240 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MY3-AC220/240 are classified into two categories based on electrical and mechanical compatibility:

Direct Substitute (PT370730): This part maintains functional equivalence through matching coil voltage (230VAC nominal, within acceptable operating range), socketable mounting, plug-in termination, and non-latching coil type. The 3PDT contact form is identical. The higher current rating (10A vs 5A) and increased switching voltage (400VAC) provide enhanced capability without compromising compatibility. Coil resistance (19.47 kOhms) and operating voltage thresholds (Must Operate: 184 VAC, Must Release: 69 VAC) remain within acceptable tolerance bands.

Similar Substitute (KHAU-17A12-240): This part shares the 240VAC coil voltage, socketable mounting, plug-in termination, and non-latching coil type. However, the contact form differs (4PDT vs 3PDT), providing additional switching capability. The identical coil voltage and comparable operating characteristics allow substitution in applications where the additional contact form can be accommodated or where only a subset of contacts is utilized.

Parameter Comparison

Engineering Selection Recommendations

PT370730 Selection: This part is recommended as the primary direct substitute. Both the main part and PT370730 maintain active product status with current RoHS compliance certifications. The 230VAC coil voltage is compatible with 240VAC supply systems within standard industrial tolerance bands. The identical 3PDT contact form ensures pin-for-pin compatibility in socketable mounting applications. The higher current rating (10A) and switching voltage (400VAC) provide operational margin without introducing incompatibility. Both parts are ECCN EAR99 classified.

KHAU-17A12-240 Selection: This part is suitable where the 4PDT contact configuration can be integrated into the application design. The exact 240VAC coil voltage match eliminates voltage compatibility considerations. Both parts maintain active status and current compliance certifications. The lower coil resistance (12 kOhms vs 18.79 kOhms) results in higher coil current (6 mA), which should be verified against circuit design parameters. This part is appropriate for applications requiring additional switching poles or where the extra contacts provide functional benefit.

Frequently Asked Questions (FAQ)

Q: Can PT370730 be used as a direct replacement for MY3-AC220/240? A: Yes. Both parts feature identical 3PDT contact configuration, socketable mounting, and plug-in termination. The 230VAC coil voltage is compatible with 240VAC supply systems. The higher current rating (10A vs 5A) and switching voltage (400VAC vs 250VAC) provide enhanced capability without compromising circuit compatibility.

Q: What is the key difference between PT370730 and KHAU-17A12-240? A: PT370730 maintains the 3PDT contact form identical to the main part, while KHAU-17A12-240 provides 4PDT configuration. PT370730 uses 230VAC coil voltage; KHAU-17A12-240 uses 240VAC. Contact material differs: PT370730 uses Silver Nickel (AgNi), while KHAU-17A12-240 uses Silver Cadmium Oxide (AgCdO).

Q: Are all three parts socketable? A: Yes. The main part (MY3-AC220/240), PT370730, and KHAU-17A12-240 are all socketable relays with plug-in termination, ensuring compatibility with standard relay sockets.

Q: What is the operating temperature range difference? A: MY3-AC220/240 operates from -55°C to 70°C. PT370730 operates from -40°C to 70°C. KHAU-17A12-240 operates from -45°C to 70°C. The main part provides the widest low-temperature range.

Q: Are all parts RoHS compliant? A: Yes. MY3-AC220/240 is RoHS Compliant. PT370730 and KHAU-17A12-240 are both ROHS3 Compliant, meeting current regulatory requirements.

Q: Can KHAU-17A12-240 be used if only 3 poles are needed? A: KHAU-17A12-240 provides 4PDT configuration. In applications requiring only 3 poles, the fourth pole remains unused. Electrical compatibility is maintained, but this represents over-specification for the application.

Q: What is the coil current difference between the parts? A: MY3-AC220/240 has 4.2 mA coil current. PT370730 coil current is not specified in the provided data. KHAU-17A12-240 has 6 mA coil current. Circuit design should verify coil current compatibility with the control circuit.