Omron MK3PD-5-I-DC12 General Purpose Relay – Equivalent & Substitute Parts

Part Overview

The Omron MK3PD-5-I-DC12 is a general purpose 3PDT (3 Form C) relay with a 12VDC coil, rated for 10A switching current. This socketable relay features an 11-pin octal termination and includes a mechanical indicator and integrated diode. The product is currently obsolete, making identification of functionally equivalent alternatives essential for system maintenance, repair, and redesign applications where continued availability is required.

Substiute Parts

MK3PD-5-I-DC12

Omron Automation and SafetyIn Stock: 764MK3PD-5-I-DC12 Datasheet

Current PartRFQ

KRPA-14DG-12

TE Connectivity Potter & Brumfield RelaysIn Stock: 959KRPA-14DG-12 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the Omron MK3PD-5-I-DC12 is determined by the following critical parameters:

• Coil Voltage: Must be 12VDC to ensure direct compatibility with existing control circuits
• Contact Form: Must be 3PDT (3 Form C) to maintain identical switching functionality
• Contact Rating: Must support minimum 10A switching current
• Mounting Type: Must be socketable to fit existing relay bases
• Termination Style: Must be 11-pin octal plug-in configuration for mechanical and electrical compatibility
• Coil Type: Must be non-latching to preserve operational behavior

The TE Connectivity Potter & Brumfield KRPA-14DG-12 meets all mandatory substitution criteria. Both relays share identical coil voltage, contact form, current rating, mounting type, and termination configuration. The KRPA-14DG-12 is an active product with current manufacturing support, addressing the obsolescence of the original Omron part.

Parameter Comparison

Engineering Selection Recommendations

The TE Connectivity KRPA-14DG-12 is the direct functional equivalent for the obsolete Omron MK3PD-5-I-DC12. Selection is based on the following engineering factors:

Product Status: The KRPA-14DG-12 is an active product with current manufacturing support, ensuring long-term availability and supply chain continuity. The Omron MK3PD-5-I-DC12 is obsolete and subject to inventory depletion.

Compliance and Certifications: Both parts are RoHS compliant. The KRPA-14DG-12 meets ROHS3 (current standard) and is REACH affected, indicating compliance with modern regulatory requirements. The Omron part meets RoHS but is no longer subject to active compliance updates due to obsolescence.

Electrical Compatibility: Both relays operate at 12VDC with identical 3PDT contact configuration and 10A current rating. The KRPA-14DG-12 has a lower maximum AC switching voltage (240VAC vs. 250VAC) but is fully compatible for DC switching applications and standard AC industrial control circuits.

Thermal Performance: The KRPA-14DG-12 supports an extended operating temperature range (-45°C to 70°C) compared to the Omron part (-10°C to 40°C), providing greater flexibility for diverse environmental applications.

Mechanical Compatibility: Both relays use identical 11-pin octal socketable termination, ensuring direct mechanical fit in existing relay bases without modification.

Frequently Asked Questions (FAQ)

Q: Can the KRPA-14DG-12 directly replace the Omron MK3PD-5-I-DC12 in existing applications?

A: Yes. Both relays share identical coil voltage (12VDC), contact form (3PDT), current rating (10A), mounting type (socketable), and termination configuration (11-pin octal). The KRPA-14DG-12 will function as a direct mechanical and electrical substitute in any circuit designed for the Omron part.

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

A: The Omron MK3PD-5-I-DC12 uses silver (Ag) contacts, while the KRPA-14DG-12 uses silver cadmium oxide (AgCdO) contacts. Both materials are suitable for general purpose relay switching. AgCdO contacts offer enhanced arc suppression and contact life in certain switching scenarios, making the KRPA-14DG-12 potentially more robust for demanding applications.

Q: Why does the KRPA-14DG-12 have a lower maximum AC switching voltage?

A: The KRPA-14DG-12 is rated for 240VAC maximum, compared to the Omron part's 250VAC. This difference is within standard industrial tolerance and does not affect compatibility for typical 120VAC or 240VAC control circuits. For DC switching applications, both relays are rated identically at 250VDC.

Q: Is the lower coil current of the KRPA-14DG-12 an advantage?

A: The KRPA-14DG-12 draws 100 mA compared to the Omron part's 126 mA. Lower coil current reduces power consumption and heat generation in the control circuit, which can be beneficial in power-constrained or thermally sensitive applications. This does not affect switching performance.

Q: Are there any compliance differences between these parts?

A: Both parts are RoHS compliant. The KRPA-14DG-12 meets the current ROHS3 standard and is REACH affected, indicating active compliance with modern environmental and chemical regulations. The Omron part meets RoHS but is no longer subject to active compliance updates due to obsolescence status.

Q: Can I use the KRPA-14DG-12 in applications with extended temperature requirements?

A: Yes. The KRPA-14DG-12 operates across -45°C to 70°C, compared to the Omron part's -10°C to 40°C range. If your application requires operation outside the original Omron temperature range, the KRPA-14DG-12 provides expanded thermal capability.

Q: What is the packaging difference?

A: The KRPA-14DG-12 is supplied in tray packaging, suitable for automated assembly and bulk handling. Packaging does not affect electrical or mechanical compatibility.