8A2121-Z Toggle Switch SP3T Equivalent & Substitute Parts

Part Overview

The 8A2121-Z is a panel-mounted toggle switch with SP3T (single pole, three throw) circuit configuration manufactured by Nidec Components Corporation. This switch is rated for 6A AC at 125V and 4A DC at 30V, featuring a momentary-on-momentary (Mom-On-Mom) switch function with a standard round actuator. The product is currently obsolete, making identification of compatible substitute components essential for system maintenance, repair, and new design implementations where equivalent functionality is required.

Substiute Parts

8A2121-Z

Nidec Components CorporationIn Stock: 8578A2121-Z Datasheet

Current PartRFQ

5644TH2RAB

APEM Inc.In Stock: 9355644TH2RAB Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the 8A2121-Z are identified based on strict electrical and mechanical parameter matching. The primary substitution criteria are:

• Circuit Configuration: SP3T topology must be maintained
• Current and Voltage Ratings: AC 6A at 125V and DC 4A at 30V are minimum requirements
• Switch Function: Mom-On-Mom operation must be preserved
• Mechanical Interface: Panel mount configuration with 6.50mm circular cutout and 1/4-40 bushing thread
• Termination: Solder lug connection style
• Compliance: ROHS3 compliance required

The 5644TH2RAB from APEM Inc. meets all these criteria and is classified as a direct substitute.

Parameter Comparison

Engineering Selection Recommendations

The 5644TH2RAB is a direct functional equivalent to the 8A2121-Z. Both components satisfy identical electrical specifications for AC and DC operation, circuit topology, and mechanical interface requirements. The 5644TH2RAB offers extended operating temperature range (-40°C to 85°C versus -20°C to 85°C) and doubled electrical life rating (50,000 cycles versus 25,000 cycles), providing enhanced performance margins in equivalent or demanding applications.

Both components maintain ROHS3 compliance, ensuring regulatory alignment for current manufacturing and procurement standards. The 5644TH2RAB is currently in active production status, providing supply chain continuity and long-term availability compared to the obsolete 8A2121-Z.

Frequently Asked Questions (FAQ)

Q: Can the 5644TH2RAB directly replace the 8A2121-Z in existing designs?

A: Yes. The 5644TH2RAB matches all critical electrical and mechanical parameters: SP3T circuit, 6A AC at 125V, 4A DC at 30V, Mom-On-Mom function, panel mount configuration with 6.50mm cutout, 1/4-40 bushing thread, and solder lug termination. No design modifications are required.

Q: What are the key differences between these components?

A: The 5644TH2RAB provides superior performance specifications: operating temperature range extends to -40°C (versus -20°C minimum), and electrical life is rated at 50,000 cycles (versus 25,000 cycles). Both maintain ROHS3 compliance.

Q: Is the 5644TH2RAB available in the same packaging as the 8A2121-Z?

A: The 8A2121-Z is supplied in standard packaging. The 5644TH2RAB is supplied in bulk packaging. Both are suitable for panel mount installation with identical mechanical interfaces.

Q: Are there any compliance or certification differences?

A: Both components are ROHS3 compliant. The 5644TH2RAB includes REACH Unaffected status. Both carry EAR99 ECCN classification and identical HTSUS codes (8536.50.9065).

Q: What is the actuator material difference?

A: The 8A2121-Z actuator material is not specified in available documentation. The 5644TH2RAB uses brass with nickel plating, providing corrosion resistance and durability.