JS1-B-24V-F Equivalent & Substitute Parts

Part Overview

The JS1-B-24V-F is a general purpose relay manufactured by Panasonic Electric Works, featuring a Single Pole Double Throw (SPDT) contact configuration with a 24VDC coil and 10A contact rating. This through-hole mounted relay is designed for standard switching applications requiring sealed operation and Class B coil insulation. The product is currently obsolete, making identification of compatible substitute parts essential for system maintenance, repair, and redesign applications.

Substiute Parts

JS1-B-24V-F

Panasonic Electric WorksIn Stock: 1092JS1-B-24V-F Datasheet

Current PartRFQ

ALQ124

Panasonic Electric WorksIn Stock: 7726ALQ124 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution compatibility for the JS1-B-24V-F is determined by the following critical parameters:

Primary Compatibility Criteria:

• Coil voltage: 24VDC (exact match required)
• Contact form: SPDT (1 Form C) configuration
• Mounting type: Through hole
• Termination style: PC pin
• Coil type: Non latching
• Operating temperature range: -40°C ~ 85°C minimum

Secondary Compatibility Considerations:

• Contact rating current capacity
• Maximum switching voltage and power ratings
• Coil resistance and current draw
• Operate and release timing characteristics
• Contact material composition
• Seal rating and environmental protection

The ALQ124 meets the primary compatibility criteria as a through-hole mounted, 24VDC SPDT relay with PC pin termination and non-latching coil operation. However, differences exist in contact rating, switching specifications, and operational timing that must be evaluated for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The ALQ124 is an active product substitute for the obsolete JS1-B-24V-F, sharing identical coil voltage, contact form, mounting type, and termination style. Both relays comply with RoHS requirements and maintain unlimited moisture sensitivity ratings.

Selection of the ALQ124 as a replacement requires evaluation of the following specification differences:

Contact Rating Reduction: The ALQ124 provides 5A contact rating compared to the JS1-B-24V-F's 10A rating. Applications requiring the full 10A switching capacity cannot use this substitute without circuit redesign.

Switching Voltage Limitation: Maximum DC switching voltage is reduced from 100VDC to 30VDC on the ALQ124. Applications switching higher DC voltages require alternative substitutes.

Operational Timing: The ALQ124 exhibits doubled operate and release times (20ms versus 10ms). Applications with timing-critical switching requirements must account for this difference.

Seal Rating: The JS1-B-24V-F specifies fully sealed operation, while the ALQ124 seal rating is not specified. Environmental protection requirements must be verified for the application.

Compliance Certifications: The ALQ124 carries CQC, cURuus, and VDE approvals, providing broader regulatory coverage than the JS1-B-24V-F for certain markets and applications.

Frequently Asked Questions (FAQ)

Q: Can the ALQ124 directly replace the JS1-B-24V-F in all applications?

A: Direct replacement is limited by contact rating and switching voltage specifications. The ALQ124's 5A contact rating and 30VDC maximum switching voltage are lower than the JS1-B-24V-F. Verify that your application operates within these reduced specifications before substitution.

Q: What is the impact of the 20ms operate and release times on the ALQ124 compared to the 10ms times of the JS1-B-24V-F?

A: The doubled switching times may affect applications requiring rapid response or high-frequency switching. Evaluate whether your circuit timing tolerances accommodate the 20ms delay. This difference is particularly relevant in control systems with strict timing requirements.

Q: Are the coil voltage and contact form identical between these relays?

A: Yes. Both relays operate on 24VDC coils and feature SPDT (1 Form C) contact configurations. These core specifications are matched, making them compatible for basic functional requirements.

Q: What are the differences in contact material, and does this affect substitution?

A: The JS1-B-24V-F uses Silver Tin Oxide (AgSnO) contacts, while the ALQ124 uses Silver Nickel (AgNi). Contact material affects switching characteristics, arc resistance, and contact life. Verify that your application's load type and switching frequency are compatible with Silver Nickel contacts.

Q: Is the ALQ124 suitable for sealed or environmentally protected applications?

A: The JS1-B-24V-F specifies fully sealed operation. The ALQ124's seal rating is not specified. If your application requires sealed relay operation for environmental protection, confirm the ALQ124's sealing characteristics with the manufacturer before substitution.

Q: Do both relays meet current RoHS compliance requirements?

A: Yes. The JS1-B-24V-F is RoHS Compliant, and the ALQ124 is ROHS3 Compliant. Both meet current environmental compliance standards. The ALQ124 additionally carries CQC, cURuus, and VDE certifications for expanded regulatory coverage.

Q: What is the packaging difference between these relays?

A: The JS1-B-24V-F packaging is listed as standard, while the ALQ124 is supplied in box packaging. This difference affects inventory management and handling but does not impact electrical or mechanical compatibility.