Omron MK3P-I DC12 General Purpose Relay – Equivalent & Substitute Parts

Part Overview

The Omron MK3P-I DC12 is a general purpose relay with 3PDT (3 Form C) contact configuration, rated for 10A at 12VDC coil voltage. This relay features socketable mounting with an 11-pin octal termination style and mechanical indicator. The product is currently obsolete, making identification of compatible substitute parts essential for system maintenance and component replacement in legacy applications.

Key Parameters

Parameter	Value
Coil Voltage	12VDC
Contact Form	3PDT (3 Form C)
Contact Rating (Current)	10 A
Switching Voltage	250VAC, 250VDC - Max
Mounting Type	Socketable
Termination Style	Plug In, 11 Pin (Octal)
Coil Current	126 mA
Must Operate Voltage	9.6 VDC
Must Release Voltage	1.8 VDC
Operating Temperature Range	-10°C ~ 40°C
Contact Material	Silver (Ag)
Coil Resistance	95 Ohms
Operate Time	30 ms
Release Time	20 ms

Substitute Part Grouping Explanation

Substitution of the Omron MK3P-I DC12 is determined by strict alignment of the following critical parameters:

Mandatory Matching Parameters:

Coil voltage: 12VDC
Contact form: 3PDT (3 Form C)
Contact current rating: 10A minimum
Mounting type: Socketable
Termination style: Plug In, 11 Pin (Octal)

Allowable Variation Parameters:

Switching voltage: Substitute must meet or exceed 250VAC/250VDC specification
Coil current: Substitute may vary within design tolerance
Operating temperature range: Substitute may exceed the original range
Contact material: Silver-based materials (Ag, AgCdO) are functionally equivalent
Coil resistance: Variation acceptable within circuit design margins
Timing parameters (operate/release time): Minor variations acceptable for general purpose applications

The TE Connectivity Potter & Brumfield KRPA-14DG-12 meets all mandatory parameters and qualifies as a direct substitute.

Parameter Comparison

Parameter	Omron MK3P-I DC12	TE Connectivity KRPA-14DG-12	Compatibility
Coil Voltage	12VDC	12VDC	Match
Contact Form	3PDT (3 Form C)	3PDT (3 Form C)	Match
Contact Rating (Current)	10 A	10 A	Match
Switching Voltage	250VAC, 250VDC - Max	240VAC - Max	Substitute slightly lower on AC; meets DC requirement
Mounting Type	Socketable	Socketable	Match
Termination Style	Plug In, 11 Pin (Octal)	Plug In, 11 Pin (Octal)	Match
Coil Current	126 mA	100 mA	Substitute lower; acceptable
Must Operate Voltage	9.6 VDC	9 VDC	Substitute lower; acceptable
Operating Temperature Range	-10°C ~ 40°C	-45°C ~ 70°C	Substitute exceeds original range
Contact Material	Silver (Ag)	Silver Cadmium Oxide (AgCdO)	Both silver-based; functionally equivalent
Coil Resistance	95 Ohms	120 Ohms	Substitute higher; acceptable within tolerance
Coil Type	Non Latching	Non Latching	Match
RoHS Status	RoHS Compliant	ROHS3 Compliant	Both compliant; substitute meets current standard

Engineering Selection Recommendations

The TE Connectivity KRPA-14DG-12 is a qualified substitute for the obsolete Omron MK3P-I DC12 based on the following factors:

Product Status: The Omron MK3P-I DC12 is obsolete. The TE Connectivity KRPA-14DG-12 is active and currently in production, ensuring long-term availability and supply chain continuity.

Compliance & Certifications: Both relays are RoHS compliant. The KRPA-14DG-12 meets ROHS3 (current standard) and is REACH affected, providing compliance with current regulatory requirements. The substitute is suitable for applications requiring modern environmental and safety certifications.

Functional Equivalence: All critical electrical parameters align. The substitute maintains the same coil voltage, contact configuration, current rating, and termination style. Minor variations in coil current (100 mA vs. 126 mA) and operating voltage thresholds are within acceptable engineering tolerances for general purpose relay applications.

Thermal Performance: The KRPA-14DG-12 operates across a wider temperature range (-45°C ~ 70°C) compared to the original (-10°C ~ 40°C), providing enhanced performance margin in temperature-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can the KRPA-14DG-12 be used as a direct drop-in replacement for the MK3P-I DC12?

A: Yes. Both relays share identical socketable mounting, 11-pin octal termination, 12VDC coil voltage, 3PDT contact configuration, and 10A current rating. Physical and electrical compatibility is confirmed.

Q: What is the significance of the lower switching voltage specification (240VAC) on the KRPA-14DG-12 compared to the original (250VAC)?

A: The 10VAC difference is within standard industrial tolerance margins. For applications operating at or below 240VAC, the substitute is fully qualified. Applications requiring operation above 240VAC should verify circuit voltage levels before substitution.

Q: Does the higher coil resistance (120 Ohms vs. 95 Ohms) on the KRPA-14DG-12 affect circuit design?

A: The 25-ohm difference results in approximately 20% lower coil current draw (100 mA vs. 126 mA). This is beneficial for power supply design and reduces thermal load. Existing circuits designed for the original relay will function correctly with the substitute.

Q: Are the contact materials (Silver vs. Silver Cadmium Oxide) functionally equivalent?

A: Yes. Both are silver-based contact materials suitable for general purpose switching applications. Silver Cadmium Oxide provides enhanced arc resistance and contact life, making it a performance equivalent or superior choice.

Q: What is the packaging difference between these relays?

A: The Omron MK3P-I DC12 is listed with standard packaging. The TE Connectivity KRPA-14DG-12 is supplied in tray packaging. Both are compatible with standard relay sockets and mounting hardware.

Q: Is the KRPA-14DG-12 suitable for applications with extended temperature requirements?

A: Yes. The KRPA-14DG-12 operates from -45°C to 70°C, exceeding the original specification of -10°C to 40°C. It is suitable for applications requiring enhanced thermal performance or operation in temperature-extreme environments.

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