HC4D-H-DC12V Equivalent & Substitute Parts

Part Overview

The HC4D-H-DC12V is a general purpose 4PDT relay manufactured by Panasonic Electric Works with a 12VDC coil, rated for 3A switching current. This socketable relay operates at 250VAC maximum switching voltage with a 160 Ohm coil resistance and 75mA coil current. The product is currently obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs requiring compatible relay functionality.

Key Parameters

Parameter	HC4D-H-DC12V
Manufacturer	Panasonic Electric Works
Coil Voltage	12VDC
Contact Form	4PDT (4 Form C)
Contact Rating (Current)	3 A
Switching Voltage (Max)	250VAC
Coil Current	75 mA
Coil Resistance	160 Ohms
Mounting Type	Socketable
Termination Style	Plug In
Operating Temperature Range	-50°C ~ 70°C
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the HC4D-H-DC12V is determined by the following critical parameters:

Coil Voltage: 12VDC (exact match required)
Contact Form: 4PDT (4 Form C) configuration (exact match required)
Contact Rating: 3A minimum (equal or higher acceptable)
Switching Voltage: 250VAC or higher (equal or higher acceptable)
Coil Current: 75mA (exact match required)
Coil Resistance: 160 Ohms (exact match required)
Mounting Type: Socketable (exact match required)
Termination Style: Plug In (exact match required)

All substitute parts listed meet these core electrical and mechanical compatibility criteria. Differences in operating temperature range, contact material composition, and compliance certifications do not affect functional substitution capability within the specified parameter envelope.

Parameter Comparison

Parameter	HC4D-H-DC12V	MY4Z DC12 (S)	KHAU-17D11-12	KHAU-17D18-12	KHU-17D11-12	MY4 DC12 (S)
Manufacturer	Panasonic Electric Works	Omron Automation and Safety	TE Connectivity Potter & Brumfield	TE Connectivity Potter & Brumfield	TE Connectivity Potter & Brumfield	Omron Automation and Safety
Coil Voltage	12VDC	12VDC	12VDC	12VDC	12VDC	12VDC
Contact Form	4PDT (4 Form C)	4PDT (4 Form C)	4PDT (4 Form C)	4PDT (4 Form C)	4PDT (4 Form C)	4PDT (4 Form C)
Contact Rating (Current)	3 A	3 A	3 A	3 A	3 A	3 A
Switching Voltage (Max)	250VAC	250VAC, 125VDC	240VAC	240VAC	240VAC	250VAC, 125VDC
Coil Current	75 mA	75 mA	75 mA	75 mA	75 mA	75 mA
Coil Resistance	160 Ohms	160 Ohms	160 Ohms	160 Ohms	160 Ohms	160 Ohms
Mounting Type	Socketable	Socketable	Socketable	Socketable	Socketable	Socketable
Termination Style	Plug In	Plug In	Plug In	Plug In	Plug In	Plug In
Operating Temperature Range	-50°C ~ 70°C	-55°C ~ 70°C	-45°C ~ 70°C	-45°C ~ 70°C	-45°C ~ 70°C	-55°C ~ 70°C
Product Status	Obsolete	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Direct Substitutes (Highest Compatibility)

MY4Z DC12 (S) and MY4 DC12 (S) from Omron Automation and Safety are active products with RoHS compliance certification. Both maintain identical electrical specifications to the HC4D-H-DC12V and support extended operating temperature ranges (-55°C to 70°C). These relays are recommended for applications requiring current product availability and regulatory compliance documentation.

Alternative Substitutes (Functional Equivalents)

KHAU-17D11-12, KHAU-17D18-12, and KHU-17D11-12 from TE Connectivity Potter & Brumfield Relays are active products meeting all core electrical parameters. KHAU-17D18-12 carries ROHS3 compliance. These relays feature faster switching times (13ms operate, 6ms release versus 20ms for the original) and operate within a narrower temperature range (-45°C to 70°C). Selection of TE Connectivity alternatives is appropriate when faster response characteristics are acceptable and compliance status aligns with system requirements.

Frequently Asked Questions (FAQ)

Q: Can I use MY4Z DC12 (S) as a direct replacement for HC4D-H-DC12V?

A: Yes. The MY4Z DC12 (S) meets all critical electrical and mechanical parameters: 12VDC coil, 4PDT contact form, 3A rating, 160 Ohm coil resistance, 75mA coil current, socketable mounting, and plug-in termination. The relay is an active product with RoHS compliance.

Q: What is the difference between the Omron MY4Z DC12 (S) and MY4 DC12 (S) substitutes?

A: Both Omron relays are functionally equivalent with identical electrical specifications. The primary difference is packaging: MY4Z DC12 (S) is supplied in bulk packaging, while MY4 DC12 (S) is also supplied in bulk. Both support the same switching voltage range (250VAC, 125VDC) and operating temperature (-55°C to 70°C).

Q: Why do TE Connectivity relays show faster switching times than the original?

A: The KHAU and KHU series relays operate with 13ms operate time and 6ms release time compared to 20ms for both the HC4D-H-DC12V and Omron MY series. This faster response is a characteristic difference of the TE Connectivity design. Applications sensitive to switching speed should evaluate this parameter during selection.

Q: Are there compliance differences between substitute options?

A: Yes. MY4Z DC12 (S) and MY4 DC12 (S) carry RoHS compliance certification. KHAU-17D18-12 is ROHS3 compliant. KHAU-17D11-12 and KHU-17D11-12 are RoHS non-compliant. System compliance requirements should guide selection when regulatory documentation is necessary.

Q: Can I use a substitute rated for 240VAC instead of 250VAC?

A: No. The TE Connectivity relays (KHAU and KHU series) are rated for 240VAC maximum switching voltage, which is below the 250VAC specification of the original HC4D-H-DC12V. Applications requiring 250VAC switching capability must use Omron MY4Z DC12 (S) or MY4 DC12 (S), both rated for 250VAC.

Q: What is the operating temperature consideration when selecting a substitute?

A: The HC4D-H-DC12V operates from -50°C to 70°C. Omron MY series relays extend the lower limit to -55°C. TE Connectivity relays operate from -45°C to 70°C. Selection should match the system's thermal environment. Applications requiring operation below -45°C must use Omron products.

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