Omron MY4F-DC24 General Purpose Relay - Equivalent & Substitute Parts

Part Overview

The Omron MY4F-DC24 is a general purpose 4PDT (4 Form C) relay with a 24VDC coil, rated for 3A contact current, and designed for chassis mount applications. This relay features solder lug termination and operates across a temperature range of -55°C to 70°C. The product is currently obsolete, making identification of suitable substitute components essential for system maintenance, repair, and redesign applications where equivalent functionality is required.

Key Parameters

Parameter	Value
Coil Voltage	24VDC
Contact Form	4PDT (4 Form C)
Contact Rating (Current)	3 A
Mounting Type	Chassis Mount
Termination Style	Solder Lug
Coil Current	36.9 mA
Switching Voltage	250VAC, 125VDC - Max
Operating Temperature Range	-55°C ~ 70°C
Contact Material	Silver (Ag)
Coil Resistance	650 Ohms
Must Operate Voltage	19.2 VDC
Must Release Voltage	2.4 VDC
Operate Time	20 ms
Release Time	20 ms
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution of the Omron MY4F-DC24 is determined by the following critical parameters:

Coil Voltage: Must be 24VDC to ensure direct compatibility with existing control circuits
Contact Form: Must be 4PDT (4 Form C) to maintain the same switching configuration
Contact Rating (Current): Minimum 3A; higher ratings provide additional margin and are acceptable
Mounting Type: Socketable relays may substitute for chassis mount applications where mechanical adaptation is feasible
Termination Style: Plug-in termination is acceptable as an alternative to solder lug, provided circuit board or connector design accommodates the change
Coil Current: Must be within acceptable operating parameters of the control circuit (36.9 mA reference)
Switching Voltage: Must support the maximum switching voltage requirements of the application (250VAC, 125VDC minimum)
Operating Temperature Range: Must encompass or exceed the application's temperature requirements
Contact Material: Silver-based materials (Ag or AgCdO) are functionally equivalent for general purpose switching

The TE Connectivity Potter & Brumfield KHAU-17D12-24 meets these substitution criteria with enhanced specifications in several areas.

Parameter Comparison

Parameter	Omron MY4F-DC24	TE Connectivity KHAU-17D12-24	Compatibility Notes
Coil Voltage	24VDC	24VDC	Identical
Contact Form	4PDT (4 Form C)	4PDT (4 Form C)	Identical
Contact Rating (Current)	3 A	5 A	Substitute rated higher; acceptable
Mounting Type	Chassis Mount	Socketable	Different; mechanical adaptation required
Termination Style	Solder Lug	Plug In	Different; circuit interface change required
Coil Current	36.9 mA	37.5 mA	Functionally equivalent
Switching Voltage	250VAC, 125VDC - Max	240VAC - Max	Substitute slightly lower on AC; verify application requirements
Operating Temperature Range	-55°C ~ 70°C	-45°C ~ 70°C	Substitute has narrower low-temperature range
Contact Material	Silver (Ag)	Silver Cadmium Oxide (AgCdO)	Both silver-based; functionally equivalent
Coil Resistance	650 Ohms	690 Ohms	Functionally equivalent
Must Operate Voltage	19.2 VDC	18 VDC	Substitute operates at lower voltage; acceptable
Operate Time	20 ms	13 ms	Substitute faster; acceptable
Release Time	20 ms	6 ms	Substitute faster; acceptable
RoHS Status	RoHS Compliant	ROHS3 Compliant	Both compliant; substitute meets current standard

Engineering Selection Recommendations

The TE Connectivity KHAU-17D12-24 is a functional substitute for the obsolete Omron MY4F-DC24 based on the following factors:

Electrical Compatibility: Both relays share identical coil voltage (24VDC) and contact form (4PDT). The substitute's 5A contact rating exceeds the original 3A specification, providing additional current-carrying capacity. Coil current and resistance values are functionally equivalent.

Operational Performance: The substitute demonstrates faster operate and release times (13 ms and 6 ms respectively versus 20 ms each), which may improve system response characteristics. The lower must-operate voltage (18 VDC versus 19.2 VDC) ensures reliable activation across the specified coil voltage range.

Compliance and Status: The substitute is an active product with ROHS3 compliance, ensuring long-term availability and adherence to current environmental standards. The original part's RoHS compliance is maintained.

Mechanical and Interface Considerations: The substitute uses socketable mounting and plug-in termination, differing from the original chassis mount with solder lug configuration. System redesign or mechanical adaptation is required to accommodate these differences.

Temperature Range Limitation: The substitute operates from -45°C to 70°C, compared to the original -55°C to 70°C. Applications requiring operation below -45°C must verify alternative solutions.

Switching Voltage: The substitute's maximum AC switching voltage is 240VAC versus the original 250VAC. Applications operating near this threshold require verification.

Frequently Asked Questions (FAQ)

Q: Can the TE Connectivity KHAU-17D12-24 directly replace the Omron MY4F-DC24 without modifications?

A: Electrical substitution is feasible; however, mechanical and interface modifications are required. The socketable mounting and plug-in termination differ from the original chassis mount with solder lug configuration. Circuit board or connector design changes are necessary.

Q: What are the key electrical parameters that determine substitution compatibility?

A: The critical parameters are coil voltage (24VDC), contact form (4PDT), and contact rating (minimum 3A). Both relays meet these requirements. Additional considerations include coil current, switching voltage, and operating temperature range for specific applications.

Q: Is the higher 5A contact rating of the substitute a concern?

A: No. A higher contact rating provides additional safety margin and is acceptable for applications originally designed for 3A. The substitute can safely handle the original application's current requirements.

Q: Does the substitute's faster switching time affect system operation?

A: The substitute's faster operate time (13 ms versus 20 ms) and release time (6 ms versus 20 ms) may improve system response. Verify that faster switching does not introduce unintended effects in timing-sensitive applications.

Q: Are there temperature range limitations with the substitute?

A: The substitute operates from -45°C to 70°C, compared to the original -55°C to 70°C. Applications requiring operation below -45°C must identify alternative solutions or verify that the narrower range is acceptable.

Q: What is the significance of the different contact materials (Ag versus AgCdO)?

A: Both silver-based materials are functionally equivalent for general purpose relay applications. Silver Cadmium Oxide (AgCdO) provides enhanced contact durability in certain switching scenarios, making it suitable as a substitute.

Q: How does the lower maximum AC switching voltage (240VAC versus 250VAC) affect compatibility?

A: Applications operating at or near 250VAC should verify that 240VAC is acceptable for their specific switching requirements. Most general purpose applications operate well below these maximum ratings.

Q: What compliance certifications should be verified for the substitute?

A: The substitute is ROHS3 compliant and REACH affected. Verify that these compliance statuses align with your application's regulatory requirements. Both parts are classified under HTSUS 8536.41.0020 and ECCN EAR99.

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