HJ4-L-T-AC24V Equivalent & Substitute Parts

Part Overview

The HJ4-L-T-AC24V is a general purpose relay manufactured by Panasonic Electric Works, featuring a 4PDT (4 Form C) contact configuration with a 24VAC coil. This socketable relay is designed for applications requiring switching of up to 5A at 250VAC or 125VDC. The product is currently obsolete, making identification of suitable substitute components essential for system maintenance, repair, and redesign applications where continued functionality is required.

Substiute Parts

HJ4-L-T-AC24V

Panasonic Electric WorksIn Stock: 1109HJ4-L-T-AC24V Datasheet

Current PartRFQ

7760056101

WeidmüllerIn Stock: 7877760056101 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HJ4-L-T-AC24V is determined by the following critical parameters:

• Contact Configuration: 4PDT (4 Form C) contact form is mandatory for functional equivalence
• Coil Voltage: 24VAC coil voltage must be maintained for direct circuit compatibility
• Mounting Type: Socketable mounting with plug-in termination style ensures mechanical and electrical compatibility with existing socket bases
• Coil Operating Characteristics: Must operate voltage of 19.2VAC and must release voltage of 7.2VAC define the functional envelope
• Switching Capability: Maximum switching voltage of 250VAC and contact current rating determine load capacity

The substitute part 7760056101 (Weidmüller DRM series) meets these core substitution criteria. While it provides enhanced current rating (10A versus 5A), it maintains the same contact form, coil voltage, socketable mounting, and operating voltage thresholds, making it suitable for applications within the original part's electrical specifications.

Parameter Comparison

Engineering Selection Recommendations

The 7760056101 (Weidmüller DRM series) is the identified substitute for the obsolete HJ4-L-T-AC24V. Selection of this substitute is based on the following engineering factors:

Functional Compatibility: Both relays share identical contact configuration (4PDT), coil voltage (24VAC), and operating voltage thresholds (19.2VAC operate, 7.2VAC release), ensuring direct functional replacement in existing circuits.

Mechanical Compatibility: Both components feature socketable mounting with plug-in termination, allowing installation in existing relay socket bases without modification.

Product Status: The substitute part is active and in production, ensuring long-term availability and supply chain continuity compared to the obsolete original part.

Compliance: The substitute part carries RoHS Compliant status and EAR99 export classification, meeting current regulatory requirements.

Performance Enhancement: The substitute provides increased contact current rating (10A versus 5A), offering improved capacity margin for applications within the original 5A specification while maintaining backward compatibility.

Operating Temperature Consideration: The substitute operates over -40°C to 55°C, which covers the lower portion of the original part's -40°C to 70°C range. Applications requiring operation above 55°C should be evaluated against actual system requirements.

Frequently Asked Questions (FAQ)

Q: Can the 7760056101 directly replace the HJ4-L-T-AC24V in existing installations?

A: Yes. Both relays feature identical 4PDT contact configuration, 24VAC coil voltage, socketable mounting, and plug-in termination. The substitute can be installed in existing relay sockets without circuit or mechanical modifications.

Q: What is the significance of the higher current rating (10A versus 5A) on the substitute?

A: The substitute's 10A contact rating provides increased capacity margin. Applications using the original 5A relay will operate within the substitute's specifications. The higher rating does not affect compatibility or require circuit changes.

Q: Are there differences in operating temperature ranges between the two relays?

A: The original part operates from -40°C to 70°C, while the substitute operates from -40°C to 55°C. For applications requiring operation above 55°C, the original temperature range should be confirmed as a system requirement before substitution.

Q: What contact materials are used in each relay?

A: The original HJ4-L-T-AC24V uses silver (Ag) contacts, while the substitute 7760056101 uses silver alloy contacts. Both materials are suitable for general purpose switching applications with equivalent electrical performance.

Q: Does the substitute meet current regulatory requirements?

A: Yes. The 7760056101 is RoHS Compliant and carries EAR99 export classification, meeting current environmental and trade compliance standards. The original part's compliance status is not specified.

Q: Are the coil current specifications different between the two relays?

A: Yes. The original part draws 45.6 mA, while the substitute draws 150 mA. Circuit designs must accommodate the higher coil current of the substitute when sizing control circuit components such as power supplies and switching devices.

Q: What is the packaging difference between these relays?

A: The original part is specified with "-" packaging notation, while the substitute is supplied in bulk packaging. Both are socketable relays with identical mechanical form factors.