MML21KA3ADKRSDR Equivalent & Substitute Parts

Part Overview

The MML21KA3ADKRSDR is a pushbutton switch manufactured by Honeywell Sensing and Productivity Solutions. This DPDT (Double Pole Double Throw) switch is designed for panel mount, front installation with illuminated LED indication in red. The device operates at 1A AC current and 125V AC voltage, featuring tactile feedback and a rectangular button actuator with black coloring.

The MML21KA3ADKRSDR is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain system functionality, ensure continued availability, and support ongoing maintenance and replacement requirements for installed equipment.

Substiute Parts

MML21KA3ADKRSDR

Honeywell Sensing and Productivity SolutionsIn Stock: 843MML21KA3ADKRSDR Datasheet

Current PartRFQ

MML21KA3ADK

Honeywell Sensing and Productivity SolutionsIn Stock: 969MML21KA3ADK Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the MML21KA3ADKRSDR are identified based on strict electrical and mechanical parameter matching. The following parameters determine substitution eligibility:

Critical Matching Parameters:

• Circuit configuration (DPDT)
• Switch function (On-On)
• Current rating (1A AC)
• Voltage rating (125V AC)
• Mounting type (Panel Mount, Front)
• Panel cutout dimensions (Rectangular - 15.20mm x 10.24mm)
• Termination style (PC Pin)
• Operating temperature range (-18°C to 65°C)
• Mechanical life (100,000 Cycles)
• Electrical life (25,000 Cycles)

The MML21KA3ADK qualifies as a substitute part because it matches all critical electrical parameters, mechanical specifications, and physical dimensions. The primary difference is the absence of LED illumination in the substitute part, which represents a functional reduction rather than an incompatibility.

Parameter Comparison

Engineering Selection Recommendations

The MML21KA3ADK is the primary substitute for the obsolete MML21KA3ADKRSDR. Selection between these parts should be based on the following engineering considerations:

For Direct Replacement: The MML21KA3ADK provides equivalent electrical and mechanical performance. Both parts are RoHS compliant and manufactured by Honeywell Sensing and Productivity Solutions. The MML21KA3ADK is currently in active production status with 913 units in stock, ensuring availability for immediate deployment.

Functional Difference: The MML21KA3ADK does not include LED illumination. Applications requiring visual status indication through the switch actuator must account for this functional difference. In such cases, external illumination solutions or alternative part selection may be necessary.

Compliance and Certification: Both parts carry identical RoHS compliance status, ECCN classification (EAR99), and HTSUS codes (8536.50.9033), ensuring regulatory equivalence for procurement and export purposes.

Frequently Asked Questions (FAQ)

Q: Can the MML21KA3ADK directly replace the MML21KA3ADKRSDR in existing installations?

A: The MML21KA3ADK provides electrical and mechanical equivalence. Both parts share identical circuit configuration (DPDT), current rating (1A AC), voltage rating (125V AC), panel cutout dimensions (15.20mm x 10.24mm), and termination style (PC Pin). The primary difference is the absence of LED illumination in the substitute part. Direct replacement is possible if illumination is not required for system operation.

Q: What is the significance of the "RSR" designation in the MML21KA3ADKRSDR part number?

A: Based on the provided specifications, the MML21KA3ADKRSDR includes LED illumination (Red) as indicated in the illumination type and color parameters. The MML21KA3ADK variant omits this illumination feature. The part number suffix reflects this functional distinction.

Q: Are there any temperature or environmental limitations that would prevent substitution?

A: Both parts operate within the identical temperature range of -18°C to 65°C. Both are classified as RoHS compliant with MSL (Moisture Sensitivity Level) 1, indicating unlimited shelf life. No environmental limitations prevent substitution based on provided specifications.

Q: How do the mechanical and electrical life ratings compare?

A: Both parts are rated for 100,000 mechanical cycles and 25,000 electrical cycles. These specifications are identical, indicating equivalent durability and operational lifespan.

Q: What is the inventory status for each part?

A: The MML21KA3ADKRSDR (obsolete) has 816 units in stock. The MML21KA3ADK (active) has 913 units in stock. The active status of the substitute part ensures continued availability for future procurement requirements.