ALZ12F24W Equivalent & Substitute Parts

Part Overview

The ALZ12F24W is a general purpose relay manufactured by Panasonic Electric Works, featuring SPDT (1 Form C) contact configuration with 16A contact rating and 24VDC coil voltage. This through-hole mounted relay is designed for industrial control applications requiring reliable switching at 440VAC maximum switching voltage. The part is currently active in production with full RoHS compliance and sealed construction for flux protection environments.

Substitute parts are necessary when the ALZ12F24W becomes unavailable due to supply constraints, obsolescence, or when alternative sourcing from qualified manufacturers is required for cost optimization or supply chain diversification.

Key Parameters

Parameter	Value
Coil Voltage	24VDC
Contact Form	SPDT (1 Form C)
Contact Rating (Current)	16 A
Switching Voltage (Max)	440VAC
Mounting Type	Through Hole
Coil Current	16.7 mA
Coil Resistance	1.44 kOhms
Coil Type	Non Latching
Termination Style	PC Pin
Operating Temperature Range	-40°C ~ 105°C
Seal Rating	Sealed - Fully
Coil Insulation	Class F
RoHS Status	RoHS Compliant

Substitute Part Grouping Explanation

Substitute parts for the ALZ12F24W are qualified based on the following critical parameters that must match or exceed the main part specifications:

Mandatory Matching Parameters:

Coil Voltage: 24VDC
Contact Form: SPDT (1 Form C)
Mounting Type: Through Hole
Termination Style: PC Pin
Coil Type: Non Latching
Coil Resistance: 1.44 kOhms
Coil Current: 16.7 mA
Coil Insulation: Class F

Acceptable Variation Parameters:

Contact Rating (Current): 16A minimum (12A is below specification and not acceptable)
Switching Voltage: 400VAC minimum (ALZ12F24W operates at 440VAC maximum)
Operating Temperature Range: Must support -40°C minimum and 85°C or higher maximum
Seal Rating: Sealed construction required
Contact Material: Silver-based compositions acceptable

The substitute parts listed below meet these criteria and are sourced from TE Connectivity Potter & Brumfield Relays, a qualified manufacturer with equivalent product lines.

Parameter Comparison

Parameter	ALZ12F24W	RT314024	RT315024	RT31L024	7-1415899-1	RZ03-1C4-D024	1415538-7	8-1393238-0
Manufacturer	Panasonic	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity	TE Connectivity
Coil Voltage	24VDC	24VDC	24VDC	24VDC	24VDC	24VDC	24VDC	24VDC
Contact Form	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT	SPDT
Contact Rating (Current)	16 A	16 A	16 A	16 A	16 A	16 A	16 A	12 A
Switching Voltage (Max)	440VAC	400VAC	400VAC	400VAC	400VAC	400VAC	400VAC	400VAC
Coil Current	16.7 mA	16.7 mA	16.7 mA	16.7 mA	16.7 mA	16.7 mA	16.7 mA	16.7 mA
Coil Resistance	1.44 kOhms	1.44 kOhms	1.44 kOhms	1.44 kOhms	1.44 kOhms	1.44 kOhms	1.44 kOhms	1.44 kOhms
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Termination Style	PC Pin	PC Pin	PC Pin	PC Pin	PC Pin	PC Pin	PC Pin	PC Pin
Coil Insulation	Class F	Class F	Class F	Class F	Class F	Class F	Class F	Class F
Operating Temperature Range	-40°C ~ 105°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Seal Rating	Sealed - Fully	Sealed - Flux Protection	Sealed - Flux Protection	Sealed - Flux Protection	Not Specified	Not Specified	Sealed - Flux Protection	Sealed - Fully
Contact Material	Silver Tin Oxide (AgSnO)	Silver Nickel (AgNi)	Silver Nickel (AgNi)	Silver Tin Oxide (AgSnO)	Silver Nickel (AgNi)	Silver Nickel (AgNi)	Silver Nickel (AgNi)	Silver Nickel (AgNi), Gold (Au)
Operate Time	15 ms	8 ms	8 ms	9 ms	8 ms	8 ms	8 ms	8 ms
Release Time	5 ms	6 ms	6 ms	6 ms	6 ms	6 ms	6 ms	6 ms
Product Status	Active	Active	Active	Active	Active	Active	Obsolete	Active
RoHS Status	RoHS Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Recommended):

RT314024, RT315024, and RT31L024 are the preferred substitutes for the ALZ12F24W. All three parts are currently active in production with ROHS3 compliance and maintain identical electrical specifications including 24VDC coil voltage, 16A contact rating, 1.44 kOhms coil resistance, and PC pin termination. These parts are sourced from TE Connectivity Potter & Brumfield Relays, an established manufacturer with proven reliability in industrial relay applications.

RT31L024 offers the additional benefit of Silver Tin Oxide contact material, matching the ALZ12F24W contact composition. This part is also designated for inrush applications, providing enhanced capability for circuits with high inrush currents.

Secondary Substitutes:

RZ03-1C4-D024 and 7-1415899-1 are functionally equivalent alternatives with identical electrical parameters. Both maintain active product status and ROHS3 compliance. These parts are suitable for applications where seal rating specifications are less critical.

Not Recommended:

1415538-7 is obsolete and should not be selected for new designs or long-term supply requirements.

8-1393238-0 has a reduced contact rating of 12A, which is below the ALZ12F24W specification of 16A and is not suitable for direct substitution in circuits requiring full 16A capacity.

Frequently Asked Questions (FAQ)

Q: Can RT314024 directly replace ALZ12F24W in existing circuits?

A: Yes. RT314024 maintains identical coil voltage (24VDC), contact form (SPDT), contact rating (16A), coil resistance (1.44 kOhms), and termination style (PC Pin). The part is pin-compatible and electrically equivalent for through-hole PCB mounting applications.

Q: What is the difference between RT314024, RT315024, and RT31L024?

A: All three parts share identical electrical specifications and are functionally interchangeable. RT31L024 is designated for inrush applications and uses Silver Tin Oxide contact material, matching the ALZ12F24W composition. RT314024 and RT315024 use Silver Nickel contacts. Selection depends on application-specific inrush current requirements and contact material preferences.

Q: Why is the operating temperature range of substitute parts limited to -40°C ~ 85°C compared to ALZ12F24W at -40°C ~ 105°C?

A: The substitute parts from TE Connectivity are rated to -40°C ~ 85°C, which is a standard operating range for industrial relays. If the application requires operation above 85°C, the ALZ12F24W must be retained. For most industrial control applications operating within standard environmental conditions, the 85°C maximum is sufficient.

Q: Is 8-1393238-0 acceptable as a substitute?

A: No. The 8-1393238-0 has a contact rating of 12A, which is below the ALZ12F24W specification of 16A. This part is not suitable for circuits designed for 16A switching capacity and should not be used as a direct replacement.

Q: What is the significance of the seal rating difference between ALZ12F24W and most substitute parts?

A: ALZ12F24W features "Sealed - Fully" construction, while most TE Connectivity substitutes use "Sealed - Flux Protection." Both provide sealed construction suitable for PCB assembly environments. "Sealed - Fully" offers enhanced protection in harsh environments with exposure to moisture or corrosive atmospheres. For standard manufacturing and storage conditions, "Sealed - Flux Protection" is adequate.

Q: Are all substitute parts RoHS compliant?

A: Yes. All listed substitute parts are ROHS3 compliant, meeting current environmental and hazardous substance restrictions. The ALZ12F24W is RoHS compliant (RoHS 2.0 equivalent).

Q: Can substitute parts be mixed in the same circuit board design?

A: Yes. All recommended substitute parts are electrically and mechanically equivalent, allowing mixed sourcing from different manufacturers or part numbers within the same design. This approach provides supply chain flexibility and reduces single-source dependency.

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