SZL-VL-D Equivalent & Substitute Parts Reference

Part Overview

The SZL-VL-D is a snap action SPDT switch manufactured by Honeywell Sensing and Productivity Solutions, designed for chassis mount applications with screw terminal connections. This switch is rated for 5A AC at 250V and 400mA DC at 125V, featuring a round pin plunger actuator and IP64 ingress protection. The product is currently obsolete, necessitating identification of functionally compatible alternatives for ongoing maintenance and repair applications. The SZL-VL-D operates with an on-momentary switch function and supports 10,000,000 mechanical cycles.

Substiute Parts

SZL-VL-D

Honeywell Sensing and Productivity SolutionsIn Stock: 951SZL-VL-D Datasheet

Current PartRFQ

SZL-VL-S-D-N-M

Honeywell Sensing and Productivity SolutionsIn Stock: 893SZL-VL-S-D-N-M Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SZL-VL-D is determined by strict alignment of electrical and mechanical parameters within the SZL-VL product family. The substitute part SZL-VL-S-D-N-M shares the following critical parameters with the main part:

Common Parameters (Substitution Basis):

• Manufacturer: Honeywell Sensing and Productivity Solutions
• Base Series: SZL-VL
• Circuit Configuration: SPDT (DB/DM)
• Switch Function: On-Mom
• Actuator Type: Round (Pin Plunger)
• Mounting Type: Chassis Mount
• Termination Style: Screw Terminal
• RoHS Compliance: Yes
• Mechanical Life: 10,000,000 Cycles

Differing Parameters (Limiting Factors):

• Current Rating: SZL-VL-D rated 5A AC / 400mA DC; SZL-VL-S-D-N-M rated 500mA AC / 50mA DC
• Voltage Rating: SZL-VL-D rated 250V AC / 125V DC; SZL-VL-S-D-N-M rated 380V AC / 220V DC
• Ingress Protection: SZL-VL-D is IP64; SZL-VL-S-D-N-M is IP67
• Operating Temperature: SZL-VL-D operates -20°C to 60°C; SZL-VL-S-D-N-M operates -20°C to 70°C
• Product Status: SZL-VL-D is obsolete; SZL-VL-S-D-N-M is active

The SZL-VL-S-D-N-M is suitable only for applications where the lower current and DC voltage ratings are acceptable and where the higher AC voltage capability and improved ingress protection (IP67) do not create incompatibility with the original circuit design.

Parameter Comparison

Engineering Selection Recommendations

Substitution Feasibility:

The SZL-VL-S-D-N-M can serve as a substitute for the obsolete SZL-VL-D only when circuit requirements align with the reduced electrical ratings. Both parts maintain RoHS compliance and identical mechanical life specifications, supporting long-term reliability in equivalent duty cycles.

Compliance Considerations:

Both parts are RoHS compliant and carry EAR99 ECCN classification. The SZL-VL-S-D-N-M offers active product status, ensuring continued availability and manufacturer support, whereas the SZL-VL-D is obsolete and subject to supply discontinuation.

Application Constraints:

Selection of the SZL-VL-S-D-N-M requires verification that the application circuit operates within 500mA AC and 50mA DC maximum current limits. Applications requiring the full 5A AC or 400mA DC rating of the original SZL-VL-D cannot use this substitute without circuit redesign. The improved IP67 rating of the substitute provides enhanced environmental protection compared to the IP64 specification of the main part.

Temperature Operating Range:

The SZL-VL-S-D-N-M supports an extended upper operating temperature limit of 70°C versus 60°C for the SZL-VL-D, providing additional thermal margin in temperature-sensitive applications.

Frequently Asked Questions (FAQ)

Q: Can the SZL-VL-S-D-N-M directly replace the SZL-VL-D in all applications?

A: No. Direct replacement is limited to applications where circuit current requirements do not exceed 500mA AC or 50mA DC. The SZL-VL-D supports 5A AC and 400mA DC, significantly higher ratings than the substitute. Applications requiring these higher current levels require alternative solutions or circuit modification.

Q: What are the key electrical differences between these parts?

A: The SZL-VL-D is rated 5A AC at 250V and 400mA DC at 125V. The SZL-VL-S-D-N-M is rated 500mA AC at 380V and 50mA DC at 220V. While the substitute supports higher AC voltage, it provides substantially lower current capacity across both AC and DC specifications.

Q: Are both parts mechanically compatible?

A: Yes. Both parts share identical actuator type (round pin plunger), mounting configuration (chassis mount), and termination style (screw terminal). Mechanical installation compatibility is confirmed. However, electrical circuit compatibility must be independently verified based on current and voltage requirements.

Q: What is the significance of the IP67 rating on the substitute versus IP64 on the main part?

A: IP67 provides waterproof protection (temporary immersion), while IP64 provides water resistance (splash protection). The SZL-VL-S-D-N-M offers superior environmental sealing. This enhanced protection does not create incompatibility but may introduce different mechanical response characteristics in moisture-laden environments.

Q: Why is the SZL-VL-D obsolete?

A: Product obsolescence is determined by manufacturer discontinuation. The SZL-VL-D is no longer in active production. The SZL-VL-S-D-N-M represents the active product line continuation within the SZL-VL series.

Q: Can I use the SZL-VL-S-D-N-M in a high-current application originally designed for the SZL-VL-D?

A: No. The 500mA AC maximum rating of the substitute is insufficient for applications requiring 5A AC. Using an undersized component creates fire and safety hazards. Alternative parts with equivalent current ratings must be sourced.

Q: Are there packaging differences between these parts?

A: The SZL-VL-D packaging specification is not provided. The SZL-VL-S-D-N-M is supplied in bulk packaging. Packaging differences do not affect electrical or mechanical performance but may impact procurement and inventory management.

Q: What is the mechanical life expectancy for both parts?

A: Both the SZL-VL-D and SZL-VL-S-D-N-M support 10,000,000 mechanical cycles, providing equivalent durability in switching applications.