Equivalent & Substitute Parts for MK3P-I AC24

Part Overview

The MK3P-I AC24 is a general purpose relay manufactured by Omron Automation and Safety, featuring a 3PDT (3 Form C) contact configuration with a 24VAC coil and 10A contact rating. This relay is designed for socketable, 11-pin octal mounting applications and includes a mechanical indicator. The product is currently obsolete, making identification of equivalent substitute parts essential for system maintenance, repair, and component sourcing in legacy applications.

Key Parameters

Parameter	Value
Coil Voltage	24VAC
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 Type	Non Latching
Operating Temperature Range	-10°C ~ 40°C
Contact Material	Silver (Ag)

Substitute Part Grouping Explanation

Substitute parts for the MK3P-I AC24 are qualified based on the following critical parameters that determine functional equivalence:

Coil Voltage: 24VAC (exact match required)
Contact Form: 3PDT (3 Form C) (exact match required)
Contact Rating: 10 A minimum (exact match required)
Mounting Type: Socketable with 11-pin octal termination (exact match required)
Coil Type: Non Latching (exact match required)

The substitute parts KRPA-14AG-24 and KRPA-14AN-24, both manufactured by TE Connectivity Potter & Brumfield Relays, meet all critical substitution criteria. Both parts are active products with identical contact configurations, coil specifications, and mounting interfaces, making them direct functional equivalents for the obsolete MK3P-I AC24.

Parameter Comparison

Parameter	MK3P-I AC24	KRPA-14AG-24	KRPA-14AN-24
Manufacturer	Omron Automation and Safety	TE Connectivity Potter & Brumfield Relays	TE Connectivity Potter & Brumfield Relays
Product Status	Obsolete	Active	Active
Coil Voltage	24VAC	24VAC	24VAC
Contact Form	3PDT (3 Form C)	3PDT (3 Form C)	3PDT (3 Form C)
Contact Rating (Current)	10 A	10 A	10 A
Switching Voltage - Max	250VAC, 250VDC	240VAC	240VAC
Coil Current	88 mA	84 mA	84 mA
Coil Type	Non Latching	Non Latching	Non Latching
Mounting Type	Socketable	Socketable	Socketable
Termination Style	Plug In, 11 Pin (Octal)	Plug In, 11 Pin (Octal)	Plug In, 11 Pin (Octal)
Must Operate Voltage	19.2 VAC	20.4 VAC	20.4 VAC
Operating Temperature Range	-10°C ~ 40°C	-45°C ~ 55°C	-45°C ~ 55°C
Contact Material	Silver (Ag)	Silver Cadmium Oxide (AgCdO)	Silver Cadmium Oxide (AgCdO)
Coil Resistance	68 Ohms	85 Ohms	85 Ohms
Features	Mechanical Indicator	None	Lighted Indicator
RoHS Status	RoHS Compliant	RoHS non-compliant	ROHS3 Compliant
Packaging	Standard	Tray	Bulk

Engineering Selection Recommendations

Both KRPA-14AG-24 and KRPA-14AN-24 are functionally equivalent substitutes for the obsolete MK3P-I AC24 based on matching coil voltage, contact configuration, current rating, and mounting interface.

KRPA-14AN-24 is the preferred substitute when RoHS3 compliance is required for new designs or systems subject to current regulatory standards. This part is actively manufactured and available in bulk packaging.

KRPA-14AG-24 is suitable for applications where RoHS compliance is not a constraint. This part is actively manufactured and available in tray packaging.

Both substitute parts operate across a wider temperature range (-45°C ~ 55°C) compared to the original MK3P-I AC24 (-10°C ~ 40°C), providing enhanced performance in extreme temperature environments. The contact material difference (Silver Cadmium Oxide versus Silver) and slightly higher coil resistance (85 Ohms versus 68 Ohms) do not affect functional equivalence for standard general purpose relay applications.

Frequently Asked Questions (FAQ)

Q: Can KRPA-14AG-24 and KRPA-14AN-24 be used interchangeably as substitutes for MK3P-I AC24?

A: Both parts meet the critical substitution criteria: 24VAC coil voltage, 3PDT contact configuration, 10A contact rating, and 11-pin octal socketable mounting. They are functionally equivalent. Selection between them depends on RoHS compliance requirements and packaging preferences.

Q: What is the difference between KRPA-14AG-24 and KRPA-14AN-24?

A: The primary differences are RoHS compliance status (KRPA-14AG-24 is RoHS non-compliant; KRPA-14AN-24 is ROHS3 compliant) and features (KRPA-14AG-24 has no indicator; KRPA-14AN-24 includes a lighted indicator). Both have identical electrical specifications and mounting interfaces.

Q: Are there any voltage compatibility concerns when substituting these parts?

A: The substitute parts have a slightly higher must-operate voltage (20.4 VAC versus 19.2 VAC for the original). In standard 24VAC applications, this difference is not significant. However, in systems operating near minimum voltage thresholds, this parameter should be verified against actual supply voltage specifications.

Q: What is the impact of the different contact materials?

A: The original MK3P-I AC24 uses Silver (Ag) contacts, while the substitutes use Silver Cadmium Oxide (AgCdO). Both materials are suitable for general purpose relay applications with 10A switching at 240VAC. Contact material selection does not affect functional equivalence for standard applications.

Q: Can these relays be used in applications requiring the full 250VAC/250VDC switching voltage of the original?

A: The substitute parts are rated for 240VAC maximum switching voltage, which is lower than the original 250VAC/250VDC rating. Applications requiring the full 250VDC switching capability should verify that 240VAC maximum rating is acceptable for their specific use case.

Q: What packaging options are available for these substitute parts?

A: KRPA-14AG-24 is available in tray packaging, while KRPA-14AN-24 is available in bulk packaging. Select based on your procurement and inventory management requirements.

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