ALE12B24 Equivalent & Substitute Parts

Part Overview

The ALE12B24 is a general purpose relay manufactured by Panasonic Electric Works, featuring a SPST-NO (1 Form A) contact configuration with a 24VDC coil. This through-hole mounted relay is rated for 16A at 277VAC maximum switching voltage and is designed for non-latching applications. The part is currently obsolete, making identification of functionally equivalent alternatives essential for system maintenance, repair, and redesign applications where continued availability is required.

Key Parameters

Parameter	Value
Coil Voltage	24VDC
Contact Form	SPST-NO (1 Form A)
Contact Rating (Current)	16 A
Switching Voltage (Max)	277VAC
Mounting Type	Through Hole
Termination Style	PC Pin, Quick Connect - 0.187" (4.7mm)
Coil Type	Non Latching
Operating Temperature Range	-40°C ~ 85°C
Contact Material	Silver Tin Oxide (AgSnO)

Substitute Part Grouping Explanation

Substitution eligibility for the ALE12B24 is determined by strict equivalence across the following critical parameters:

Coil Voltage: Must be 24VDC
Contact Configuration: Must be SPST-NO (1 Form A)
Current Rating: Must be 16A minimum
Maximum Switching Voltage: Must be 277VAC or higher
Mounting Type: Must be Through Hole
Termination Style: Must be PC Pin, Quick Connect - 0.187" (4.7mm)
Coil Type: Must be Non Latching

The PCK-124D2M,000 from TE Connectivity Potter & Brumfield Relays meets all mandatory substitution criteria. Both relays share identical coil voltage, contact form, current rating, switching voltage capability, mounting configuration, and termination style. Variations in coil current (16.7 mA vs. 20.8 mA), coil resistance (1.44 kOhms vs. 1.15 kOhms), and operating temperature range (-40°C ~ 85°C vs. -30°C ~ 85°C) do not preclude functional substitution when the application requirements fall within the overlapping specifications.

Parameter Comparison

Parameter	ALE12B24 (Panasonic)	PCK-124D2M,000 (TE Connectivity)	Match Status
Coil Voltage	24VDC	24VDC	Equivalent
Contact Form	SPST-NO (1 Form A)	SPST-NO (1 Form A)	Equivalent
Contact Rating (Current)	16 A	16 A	Equivalent
Switching Voltage (Max)	277VAC	277VAC	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Termination Style	PC Pin, Quick Connect - 0.187" (4.7mm)	PC Pin, Quick Connect - 0.187" (4.7mm)	Equivalent
Coil Type	Non Latching	Non Latching	Equivalent
Coil Current	16.7 mA	20.8 mA	Variation
Coil Resistance	1.44 kOhms	1.15 kOhms	Variation
Must Operate Voltage	18 VDC	18 VDC	Equivalent
Must Release Voltage	1.2 VDC	1.2 VDC	Equivalent
Operate Time	20 ms	20 ms	Equivalent
Release Time	20 ms	10 ms	Variation
Operating Temperature Range	-40°C ~ 85°C	-30°C ~ 85°C	Partial Overlap
Contact Material	Silver Tin Oxide (AgSnO)	Silver Tin Oxide (AgSnO)	Equivalent
Product Status	Obsolete	Active	Substitute Available
RoHS Status	RoHS Compliant	Not applicable	Variation

Engineering Selection Recommendations

The PCK-124D2M,000 is a direct functional substitute for the obsolete ALE12B24. Both relays are certified to the same international standards (CSA, TUV, UR, VDE) and share identical electrical switching characteristics across all critical parameters. The PCK-124D2M,000 holds active product status, ensuring long-term availability and supply chain continuity.

Selection of the PCK-124D2M,000 is appropriate for applications where the operating temperature range does not require operation below -30°C. For applications requiring operation at temperatures below -30°C, the ALE12B24's extended lower temperature limit (-40°C) must be verified as a mandatory requirement before substitution.

The slightly higher coil current (20.8 mA vs. 16.7 mA) of the PCK-124D2M,000 requires verification that the coil drive circuit can supply the additional current without exceeding design specifications. The faster release time (10 ms vs. 20 ms) of the substitute part may be advantageous in applications requiring rapid de-energization but must be evaluated against any timing-dependent circuit behavior.

Frequently Asked Questions (FAQ)

Q: Can the PCK-124D2M,000 be used as a direct replacement for the ALE12B24 in existing PCB assemblies?

A: Yes, the PCK-124D2M,000 is mechanically and electrically compatible. Both relays use identical through-hole mounting with PC pin, quick connect 0.187" (4.7mm) termination. No PCB modifications are required for physical installation.

Q: What is the impact of the higher coil current (20.8 mA vs. 16.7 mA) on circuit design?

A: The coil drive circuit must be capable of supplying the additional 4.1 mA. Verify that the coil driver (transistor, IC output, or relay module) has sufficient current capacity and that power supply margins remain adequate. This is a design verification requirement, not a compatibility issue.

Q: Does the faster release time of the PCK-124D2M,000 (10 ms vs. 20 ms) affect system performance?

A: The faster release time is a performance improvement in most applications. However, if the system design relies on the 20 ms release time for timing synchronization or circuit sequencing, this parameter must be evaluated. In such cases, functional testing is necessary to confirm compatibility.

Q: Are there temperature range limitations when substituting the PCK-124D2M,000?

A: The PCK-124D2M,000 operates from -30°C to 85°C, compared to the ALE12B24's -40°C to 85°C range. If the application requires operation below -30°C, the substitute part is not suitable. Verify the actual operating environment temperature specifications before selection.

Q: What is the difference in RoHS compliance between these two relays?

A: The ALE12B24 is RoHS Compliant. The PCK-124D2M,000 shows "Not applicable" RoHS status. For applications subject to RoHS regulations or customer requirements, this difference must be evaluated against specific compliance mandates.

Q: Are both relays certified to the same standards?

A: Both relays carry CSA, TUV, UR, and VDE certifications, ensuring equivalent regulatory compliance for industrial and commercial applications.

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