Electroswitch B421J2ZQ2 Equivalent & Substitute Parts

Part Overview

The Electroswitch B421J2ZQ2 is a rocker switch with 4PDT (four-pole double-throw) configuration rated for 6A at 125V AC and 28V DC. This panel-mount switch features a paddle actuator with solder lug termination and epoxy sealed terminals. The part maintains active product status with 897 units in current inventory.

Substitute parts become necessary when the primary part reaches end-of-life status, inventory depletion, or when design requirements permit alternative configurations that meet electrical and mechanical specifications.

Substiute Parts

B421J2ZQ2

ElectroswitchIn Stock: 1004B421J2ZQ2 Datasheet

Current PartRFQ

M2043TNW01-EA

NKK SwitchesIn Stock: 745M2043TNW01-EA Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The NKK Switches M2043TNW01-EA qualifies as a substitute based on the following matched parameters:

• Circuit configuration: 4PDT
• Switch function: On-Off-On
• Mounting type: Panel Mount, Flange
• Actuator type: Paddle
• Termination style: Solder Lug
• Operating temperature range: -30°C to 85°C
• Approval agencies: CSA, UL
• AC voltage rating: 125V

Substitution is valid where DC current requirements do not exceed 3A and DC voltage does not exceed 30V, as the M2043TNW01-EA has reduced DC specifications compared to the B421J2ZQ2.

Parameter Comparison

Engineering Selection Recommendations

The B421J2ZQ2 is the preferred selection for new designs due to its active product status and higher electrical life rating of 60,000 cycles. The part maintains full RoHS compliance and CSA/UL certifications.

The M2043TNW01-EA may be considered only where inventory constraints require substitution and where circuit requirements remain within its specified limits: maximum 3A DC current and 30V DC voltage. The obsolete product status of the M2043TNW01-EA makes it unsuitable for long-term production applications.

Panel cutout dimensions differ slightly between parts (B421J2ZQ2: 17.96mm x 10.62mm; M2043TNW01-EA: 17.80mm x 10.10mm). Mechanical fit verification is required before substitution in existing panel designs.

Frequently Asked Questions (FAQ)

Q: Can the M2043TNW01-EA replace the B421J2ZQ2 in all applications?

A: No. The M2043TNW01-EA has reduced DC current rating (3A versus unspecified for B421J2ZQ2) and lower electrical life (25,000 cycles versus 60,000 cycles). Substitution is valid only where DC current does not exceed 3A and where the lower cycle life is acceptable.

Q: What are the panel cutout dimension differences?

A: The B421J2ZQ2 requires a 17.96mm x 10.62mm rectangular cutout, while the M2043TNW01-EA requires 17.80mm x 10.10mm. Existing panel designs may require modification to accommodate the substitute part.

Q: Are both parts RoHS compliant?

A: Yes. The B421J2ZQ2 is RoHS Compliant, and the M2043TNW01-EA is ROHS3 Compliant. Both meet current environmental standards.

Q: Why is the M2043TNW01-EA listed as obsolete?

A: Obsolete status indicates the part is no longer in active production. While 694 units remain in inventory, long-term availability cannot be guaranteed. The B421J2ZQ2 should be specified for new designs requiring sustained production support.

Q: What is the electrical life difference between these parts?

A: The B421J2ZQ2 is rated for 60,000 electrical cycles, while the M2043TNW01-EA is rated for 25,000 cycles. This represents a significant difference in expected operational lifespan under switching conditions.