MK3P-I AC12 Equivalent & Substitute Parts

Part Overview

The MK3P-I AC12 is a general purpose relay manufactured by Omron Automation and Safety, featuring a 3PDT (3 Form C) contact configuration with a 12VAC coil and 10A contact rating. This socketable relay is designed for industrial control applications requiring reliable switching of AC and DC loads up to 250V.

The MK3P-I AC12 is classified as obsolete. Identifying equivalent substitute parts is necessary to maintain system functionality, ensure continued availability for maintenance and replacement, and support legacy equipment still in operation.

Substiute Parts

MK3P-I AC12

Omron Automation and SafetyIn Stock: 1192MK3P-I AC12 Datasheet

Current PartRFQ

KRPA-14AN-12

TE Connectivity Potter & Brumfield RelaysIn Stock: 1088KRPA-14AN-12 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MK3P-I AC12 is determined by strict alignment of the following critical parameters:

• Coil voltage: 12VAC (exact match required)
• Contact configuration: 3PDT (3 Form C) (exact match required)
• Contact current rating: 10A (exact match required)
• Mounting type: Socketable (exact match required)
• Termination style: Plug In, 11 Pin (Octal) (exact match required)
• Coil type: Non Latching (exact match required)

The KRPA-14AN-12 manufactured by TE Connectivity Potter & Brumfield Relays meets all critical substitution criteria. Both relays share identical coil voltage, contact form, current rating, socketable mounting, octal pin termination, and non-latching coil type. These parameters ensure functional and mechanical compatibility in applications originally designed for the MK3P-I AC12.

Parameter Comparison

Engineering Selection Recommendations

Both the MK3P-I AC12 and KRPA-14AN-12 are classified as obsolete products. The KRPA-14AN-12 is suitable as a direct substitute based on matching critical electrical and mechanical parameters: identical coil voltage, contact configuration, current rating, socketable mounting, and octal pin termination.

The KRPA-14AN-12 offers an extended operating temperature range (-45°C ~ 55°C versus -10°C ~ 40°C), which provides greater thermal flexibility for applications operating outside the original MK3P-I AC12 specification. The KRPA-14AN-12 achieves ROHS3 compliance, meeting current regulatory requirements for new equipment designs and legacy system replacements.

The maximum switching voltage of the KRPA-14AN-12 is 240VAC, compared to 250VAC for the MK3P-I AC12. For applications requiring switching at 250VAC, the MK3P-I AC12 specification should be retained if available. For applications operating at or below 240VAC, the KRPA-14AN-12 provides full compatibility.

Frequently Asked Questions (FAQ)

Q: Can the KRPA-14AN-12 be used as a direct replacement for the MK3P-I AC12 in existing equipment?

A: Yes, the KRPA-14AN-12 is mechanically and electrically compatible. Both relays feature identical 12VAC coil voltage, 3PDT contact configuration, 10A current rating, socketable mounting, and 11-pin octal termination. The relay can be inserted into existing sockets without modification.

Q: What is the difference in coil current between these two relays?

A: The MK3P-I AC12 draws 180 mA, while the KRPA-14AN-12 draws 168 mA. The lower coil current of the KRPA-14AN-12 may reduce power consumption in control circuits. Existing driver circuits designed for the MK3P-I AC12 will operate the KRPA-14AN-12 without modification.

Q: Are there any voltage limitations when substituting the KRPA-14AN-12?

A: The KRPA-14AN-12 has a maximum switching voltage of 240VAC, compared to 250VAC for the MK3P-I AC12. For applications switching loads at 250VAC, the original MK3P-I AC12 specification should be maintained. For applications at 240VAC or lower, the KRPA-14AN-12 is fully suitable.

Q: What is the difference in contact material between these relays?

A: The MK3P-I AC12 uses silver (Ag) contacts, while the KRPA-14AN-12 uses silver cadmium oxide (AgCdO) contacts. Both materials are suitable for general purpose switching applications. The AgCdO contacts in the KRPA-14AN-12 provide enhanced arc suppression characteristics.

Q: Does the KRPA-14AN-12 meet current compliance standards?

A: Yes, the KRPA-14AN-12 is ROHS3 compliant, meeting current regulatory requirements. The MK3P-I AC12 is RoHS compliant. Both relays carry EAR99 ECCN classification and share the same HTSUS code (8536.41.0050).

Q: What is the operating temperature range difference?

A: The MK3P-I AC12 operates from -10°C to 40°C, while the KRPA-14AN-12 operates from -45°C to 55°C. The KRPA-14AN-12 provides a wider thermal operating window, suitable for applications in more extreme environmental conditions.