ET420K12-Z Toggle Switch 4PST 20A 125V Equivalent & Substitute Parts

Part Overview

The ET420K12-Z is a 4PST toggle switch manufactured by Nidec Components Corporation, rated for 20A at 125V AC with panel mount configuration. This component is classified as obsolete, necessitating identification of active equivalent parts to maintain design continuity and ensure supply chain availability. The switch features a standard round actuator with solder lug termination and circular panel cutout of 12.50mm diameter.

Substiute Parts

ET420K12-Z

Nidec Components CorporationIn Stock: 947ET420K12-Z Datasheet

Current PartRFQ

ET425K12-Z

Nidec Components CorporationIn Stock: 897ET425K12-Z Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ET420K12-Z is determined by strict equivalence in the following critical parameters:

• Circuit Configuration: 4PST topology must be maintained for electrical compatibility
• Mounting Type: Panel mount with identical mechanical interface (M12 x 1 bushing thread, 12.50mm circular cutout)
• Actuator Specifications: Standard round actuator with 17.50mm length ensures mechanical fit and operational consistency
• Termination Style: Solder lug termination for PCB integration compatibility
• Voltage Rating: 125V AC minimum requirement
• Current Rating: Must equal or exceed 20A AC rating
• Compliance: ROHS3 compliance and MSL 1 rating maintained across substitutes

The ET425K12-Z qualifies as a direct substitute based on these parameters. The primary distinction is an increased current rating of 25A AC, which provides enhanced capacity while maintaining all other mechanical and electrical specifications.

Parameter Comparison

Engineering Selection Recommendations

The ET425K12-Z is the appropriate substitute for the obsolete ET420K12-Z. Selection is based on the following engineering criteria:

Product Status: The ET425K12-Z maintains active product status with Nidec Components Corporation, ensuring continued availability and supply chain support. The ET420K12-Z is classified as obsolete, making transition to an active equivalent necessary for long-term design sustainability.

Compliance and Certifications: Both parts maintain ROHS3 compliance and MSL 1 rating, ensuring environmental and moisture sensitivity requirements are met without modification to assembly or storage procedures.

Electrical Compatibility: The ET425K12-Z provides a current rating of 25A AC, which exceeds the original 20A requirement while maintaining identical voltage rating and circuit topology. This uprated capacity is compatible with designs specified for 20A operation.

Mechanical Compatibility: Identical panel mount configuration, actuator geometry, and termination style ensure direct mechanical and electrical substitution without design modification or panel rework.

Frequently Asked Questions (FAQ)

Q: Can the ET425K12-Z be used as a direct replacement for ET420K12-Z in existing designs?

A: Yes. The ET425K12-Z is mechanically and electrically compatible with the ET420K12-Z. All mounting dimensions, actuator specifications, and termination styles are identical. The increased current rating of 25A AC is compatible with circuits designed for 20A operation.

Q: What is the primary difference between these two parts?

A: The ET425K12-Z has a current rating of 25A AC compared to the ET420K12-Z at 20A AC. All other specifications, including voltage rating, circuit configuration, mounting type, and mechanical dimensions, are identical.

Q: Are there any compliance or certification differences?

A: No. Both parts maintain ROHS3 compliance and MSL 1 rating. No changes to assembly, storage, or handling procedures are required when transitioning from ET420K12-Z to ET425K12-Z.

Q: Does the panel cutout require modification?

A: No. Both parts use identical panel cutout dimensions (circular 12.50mm diameter) and M12 x 1 bushing thread. No panel rework is necessary.

Q: What is the packaging difference?

A: The ET420K12-Z is supplied in standard packaging, while the ET425K12-Z is supplied in bulk packaging. This does not affect component functionality or compatibility.