Omron MJN3CF-AC24 General Purpose Relay - Equivalent & Substitute Parts

Part Overview

The Omron MJN3CF-AC24 is a general purpose relay with 3PDT (3 Form C) contact configuration, rated for 10A at 24VAC coil voltage. This relay is designed for chassis mount applications requiring reliable switching of AC and DC loads up to 600VAC or 28VDC. The part is currently active in production with 1020 units in stock. Substitute parts are identified when equivalent electrical and mechanical parameters are required due to component availability, supply chain considerations, or specific application constraints.

Key Parameters

Parameter	Value
Manufacturer Part Number	MJN3CF-AC24
Manufacturer	Omron Automation and Safety
Series	MJN
Contact Form	3PDT (3 Form C)
Contact Rating (Current)	10 A
Coil Voltage	24VAC
Switching Voltage (Max)	600VAC, 28VDC
Mounting Type	Chassis Mount
Termination Style	Quick Connect - 0.187" (4.7mm)
Coil Type	Non Latching
Operating Temperature Range	-45°C ~ 45°C
Product Status	Active
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitution of the Omron MJN3CF-AC24 is based on the following critical parameters that must remain equivalent:

Contact Configuration: 3PDT (3 Form C) - determines switching capability and circuit topology compatibility
Contact Rating: 10A minimum - ensures load handling capacity
Coil Voltage: 24VAC - maintains control circuit compatibility
Mounting Type: Chassis Mount - ensures mechanical fit in existing designs
Termination Style: Quick Connect - 0.187" (4.7mm) - guarantees electrical connection compatibility
Coil Type: Non Latching - preserves operational behavior
Operating Temperature Range: -45°C ~ 45°C - maintains environmental performance

The TE Connectivity Potter & Brumfield KUP-14A55-24 meets all critical substitution criteria within these parameters.

Parameter Comparison

Parameter	Omron MJN3CF-AC24	TE Connectivity KUP-14A55-24	Compatibility
Contact Form	3PDT (3 Form C)	3PDT (3 Form C)	Equivalent
Contact Rating (Current)	10 A	10 A	Equivalent
Coil Voltage	24VAC	24VAC	Equivalent
Switching Voltage (Max)	600VAC, 28VDC	240VAC	KUP rated for 240VAC maximum
Coil Current	83.3 mA	115 mA	KUP requires higher coil current
Mounting Type	Chassis Mount	Chassis Mount	Equivalent
Termination Style	Quick Connect - 0.187" (4.7mm)	Quick Connect - 0.187" (4.7mm)	Equivalent
Coil Type	Non Latching	Non Latching	Equivalent
Operating Temperature Range	-45°C ~ 45°C	-45°C ~ 45°C	Equivalent
Operate Time	20 ms	15 ms	KUP operates faster
Release Time	10 ms	10 ms	Equivalent
Contact Material	Silver Alloy	Silver Cadmium Oxide (AgCdO)	Different contact materials
Coil Resistance	72 Ohms	72 Ohms	Equivalent
RoHS Status	RoHS Compliant	RoHS non-compliant	Compliance difference

Engineering Selection Recommendations

Omron MJN3CF-AC24 is the primary selection when:

RoHS compliance is required for the end application
Switching voltage up to 600VAC is required
Lower coil current draw (83.3 mA) is preferred for power-constrained control circuits
Silver alloy contact material is specified

TE Connectivity KUP-14A55-24 is an acceptable substitute when:

Application switching voltage does not exceed 240VAC
Higher coil current (115 mA) is acceptable in the control circuit design
RoHS non-compliance is permissible for the application
Faster operate time (15 ms vs 20 ms) provides operational advantage
Silver cadmium oxide contact material is compatible with the load type

Both relays maintain equivalent contact configuration, current rating, coil voltage, mounting, and termination specifications necessary for direct substitution in chassis mount applications.

Frequently Asked Questions (FAQ)

Q: Can the KUP-14A55-24 directly replace the MJN3CF-AC24 in all applications?

A: Direct replacement is possible for applications where switching voltage does not exceed 240VAC and RoHS non-compliance is acceptable. The MJN3CF-AC24 supports higher switching voltage (600VAC) and maintains RoHS compliance. Verify application voltage requirements before substitution.

Q: What is the impact of different coil currents (83.3 mA vs 115 mA)?

A: The KUP-14A55-24 requires 38% higher coil current. Control circuit power supplies and switching components must be rated for the higher current draw. Verify that existing control circuit design accommodates 115 mA coil current.

Q: Are the contact materials interchangeable?

A: Silver alloy (MJN3CF-AC24) and silver cadmium oxide (KUP-14A55-24) have different electrical and thermal characteristics. Contact material selection depends on the specific load type and switching frequency. Consult load specifications to confirm compatibility.

Q: Does the faster operate time of the KUP-14A55-24 affect system performance?

A: The KUP-14A55-24 operates 5 ms faster (15 ms vs 20 ms). This may improve response time in time-sensitive applications but does not affect compatibility with standard relay control circuits. Verify that faster switching does not introduce unintended transient effects in the application.

Q: What are the packaging and inventory considerations?

A: Both relays are supplied in bulk packaging. Omron MJN3CF-AC24 has 1020 units in stock; TE Connectivity KUP-14A55-24 has 1219 units in stock. Confirm availability for production requirements.

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