HJ4-L-T-DC110V Equivalent & Substitute Parts

Part Overview

The HJ4-L-T-DC110V is a general purpose relay manufactured by Panasonic Electric Works, featuring a 4PDT (4 Form C) contact configuration with a 110VDC coil. This socketable relay is designed for applications requiring switching of multiple independent circuits with a single coil energization. The product is currently obsolete, making identification of suitable substitute components essential for system maintenance, repair, and redesign applications where continued availability is required.

Substiute Parts

HJ4-L-T-DC110V

Panasonic Electric WorksIn Stock: 811HJ4-L-T-DC110V Datasheet

Current PartRFQ

PT570110

TE Connectivity Potter & Brumfield RelaysIn Stock: 1208PT570110 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the HJ4-L-T-DC110V is determined by the following critical parameters:

• Coil Voltage: Must be 110VDC to ensure direct compatibility with existing control circuits
• Contact Form: Must be 4PDT (4 Form C) to maintain the same switching capability and circuit topology
• Mounting Type: Must be socketable to fit existing relay sockets without mechanical modification
• Termination Style: Must support plug-in connection for direct socket compatibility
• Coil Type: Must be non-latching to preserve operational behavior
• Operating Temperature Range: Must encompass -40°C ~ 70°C minimum
• Contact Rating (Current): Minimum 5 A required; higher ratings are acceptable for applications within the specified switching voltage limits

The PT570110 manufactured by TE Connectivity Potter & Brumfield Relays meets all critical substitution criteria and is classified as an equivalent substitute.

Parameter Comparison

Engineering Selection Recommendations

The PT570110 is a direct functional substitute for the HJ4-L-T-DC110V. Both relays share identical coil voltage, contact form, mounting type, and termination style. The PT570110 offers the following advantages:

• Active Product Status: The PT570110 is currently in active production, ensuring long-term availability and supply chain continuity
• Higher Contact Rating: The 6 A contact rating exceeds the original 5 A specification, providing additional margin for applications within the specified switching voltage limits
• Improved Switching Performance: Faster operate and release times (15 ms and 10 ms respectively) compared to the original 20 ms specification
• Lower Coil Current: Reduced coil current (6.8 mA vs. 9.1 mA) results in lower power consumption in control circuits
• Regulatory Compliance: ROHS3 compliance and REACH unaffected status meet current environmental and regulatory requirements

The PT570110 is suitable for direct replacement in applications where the HJ4-L-T-DC110V is no longer available.

Frequently Asked Questions (FAQ)

Q: Can the PT570110 be used as a direct drop-in replacement for the HJ4-L-T-DC110V?

A: Yes. Both relays feature identical 110VDC coil voltage, 4PDT contact configuration, socketable mounting, and plug-in termination. The PT570110 will function in existing relay sockets designed for the HJ4-L-T-DC110V without mechanical or electrical modification.

Q: What are the differences in contact rating between these relays?

A: The HJ4-L-T-DC110V is rated for 5 A, while the PT570110 is rated for 6 A. The higher rating of the PT570110 provides additional current-carrying capacity. Both relays operate within the same switching voltage limits for their respective specifications.

Q: How do the switching voltage specifications compare?

A: The HJ4-L-T-DC110V supports 250VAC and 125VDC maximum switching voltage. The PT570110 supports 240VAC maximum switching voltage. For applications operating at or near 250VAC, the original specification should be verified against the PT570110 datasheet to confirm suitability.

Q: Are there differences in operating speed?

A: Yes. The PT570110 operates faster than the HJ4-L-T-DC110V. Operate time is 15 ms (vs. 20 ms) and release time is 10 ms (vs. 20 ms). These differences are typically negligible for general purpose relay applications but should be considered in time-critical switching circuits.

Q: What is the significance of the different contact materials?

A: The HJ4-L-T-DC110V uses silver (Ag) contacts, while the PT570110 uses silver nickel (AgNi) contacts. Silver nickel provides improved wear resistance and is suitable for general purpose switching applications. Both materials are standard for relay contact surfaces.

Q: Does the PT570110 meet current environmental standards?

A: Yes. The PT570110 is ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic components in most jurisdictions.

Q: What is the difference in coil resistance?

A: The HJ4-L-T-DC110V has a coil resistance of 11 kOhms, while the PT570110 has 16.1 kOhms. This difference results in the lower coil current of the PT570110 (6.8 mA vs. 9.1 mA). Both values are within acceptable ranges for 110VDC relay coils.