HC4D-H-AC100V Equivalent & Substitute Parts

Part Overview

The HC4D-H-AC100V is a general purpose relay manufactured by Panasonic Electric Works, featuring a 4PDT (4 Form C) contact configuration with a 100VAC coil. This socketable relay is rated for 3A switching capacity at 250VAC maximum and operates across a temperature range of -50°C to 70°C. The product is currently obsolete, making identification of compatible substitute components essential for system maintenance, repair, and redesign applications where this relay is specified in legacy equipment.

Substiute Parts

HC4D-H-AC100V

Panasonic Electric WorksIn Stock: 851HC4D-H-AC100V Datasheet

Current PartRFQ

MY4 AC110/120 (S)

Omron Automation and SafetyIn Stock: 1261MY4 AC110/120 (S) Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The MY4 AC110/120 (S) manufactured by Omron Automation and Safety qualifies as a substitute for the HC4D-H-AC100V based on the following critical parameters:

Matching Parameters:

• Contact Form: Both are 4PDT (4 Form C) configurations
• Contact Rating: Both rated at 3A
• Switching Voltage: Both support 250VAC maximum
• Mounting Type: Both are socketable
• Termination Style: Both use plug-in termination
• Coil Type: Both are non-latching
• Operate/Release Time: Both operate and release in 20 ms
• Relay Type: Both are general purpose relays

Coil Voltage Consideration: The HC4D-H-AC100V operates at 100VAC, while the MY4 AC110/120 (S) operates at 120VAC. This 20VAC difference falls within acceptable tolerance for AC coil relays in industrial applications where nominal supply voltages typically range 100-120VAC. The must-operate voltage of the substitute (96VAC) remains compatible with the original's operating envelope.

Temperature Range: The substitute supports -55°C to 70°C, which encompasses the original's -50°C to 70°C range.

Parameter Comparison

Engineering Selection Recommendations

The MY4 AC110/120 (S) is the identified substitute for the HC4D-H-AC100V. Selection should be based on the following factors:

Product Availability: The HC4D-H-AC100V is obsolete. The MY4 AC110/120 (S) is active and maintains current inventory of 1221 units, ensuring supply chain continuity for new builds and repairs.

Compliance Status: The MY4 AC110/120 (S) carries RoHS Compliance and REACH Unaffected certifications, meeting modern regulatory requirements. Both parts share the same ECCN (EAR99) and HTSUS (8536.49.0050) classifications.

Functional Equivalence: Both relays maintain identical contact configurations, current ratings, switching voltages, and timing characteristics. The 20VAC coil voltage difference (100VAC vs. 120VAC) is within standard industrial AC supply tolerance ranges and does not compromise functional compatibility in typical applications.

Coil Current Differential: The substitute draws 8.4 mA compared to the original's 13.2 mA, representing a 36% reduction in coil power consumption. This improvement may benefit circuit design in power-constrained applications.

Frequently Asked Questions (FAQ)

Q: Can the MY4 AC110/120 (S) directly replace the HC4D-H-AC100V in existing equipment?

A: Yes. Both relays are socketable with identical plug-in termination, allowing direct socket replacement. The 4PDT contact configuration, 3A rating, and 20ms timing are identical. The 20VAC coil voltage difference is within acceptable tolerance for AC-powered systems.

Q: What is the significance of the coil voltage difference between 100VAC and 120VAC?

A: Industrial AC supplies typically operate within a ±10% tolerance band. The 100VAC and 120VAC ratings both fall within standard utility voltage ranges. The MY4 AC110/120 (S) must-operate voltage of 96VAC ensures reliable pickup across the specified operating envelope.

Q: Are there mechanical compatibility concerns with the substitute?

A: No. Both relays are socketable with plug-in termination, ensuring mechanical compatibility with existing relay sockets and circuit board layouts.

Q: How does the lower coil current of the substitute affect circuit design?

A: The MY4 AC110/120 (S) coil current of 8.4 mA versus the original 13.2 mA reduces power consumption by approximately 36%. This may allow use of lower-rated control circuit components in new designs, though existing circuits designed for the original will function without modification.

Q: What contact material difference exists between these relays?

A: The HC4D-H-AC100V uses Silver Nickel (AgNi) contacts, while the MY4 AC110/120 (S) uses Silver (Ag) contacts. Both materials are suitable for general purpose switching applications at the specified 3A rating and 250VAC switching voltage.

Q: Is the substitute suitable for applications requiring extended temperature operation?

A: Yes. The MY4 AC110/120 (S) operating range of -55°C to 70°C exceeds the original specification of -50°C to 70°C, providing additional margin for low-temperature environments.