NKK Switches S338F/U Toggle Switch DPDT Equivalent & Substitute Parts

Part Overview

The S338F/U is a panel-mount toggle switch manufactured by NKK Switches, featuring DPDT (Double Pole Double Throw) circuitry with momentary-off-momentary (Mom-Off-Mom) switching function. Rated for 15A AC at 125V and 20A DC at 30V, this component is classified as obsolete. Due to its discontinued status, identifying functionally equivalent substitute parts is essential for system maintenance, repair, and new design implementations where this switching topology is required.

Substiute Parts

S338F/U

NKK SwitchesIn Stock: 1033S338F/U Datasheet

Current PartRFQ

S28AWF

NKK SwitchesIn Stock: 1086S28AWF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the S338F/U is determined by strict equivalence across the following critical parameters:

Circuit configuration must remain DPDT to maintain electrical topology compatibility. Switch function must be Mom-Off-Mom to preserve operational behavior. Current and voltage ratings must meet or exceed the original specification: 15A AC at 125V and 20A DC at 30V. Mounting type, panel cutout dimensions, bushing thread, and termination style must be identical to ensure mechanical and electrical interface compatibility. Actuator type, length, and material must match to maintain physical fit and operational feel. Operating temperature range must encompass or exceed the original range. Electrical life rating must be equivalent or superior.

The S28AWF qualifies as a direct substitute based on these criteria. Both parts share identical electrical ratings, circuit configuration, switch function, mounting specifications, actuator characteristics, termination style, and panel interface dimensions. Both employ brass chrome-plated actuators and maintain 25,000-cycle electrical life ratings.

Parameter Comparison

Engineering Selection Recommendations

The S28AWF is a direct functional equivalent to the S338F/U and is the appropriate substitute for new procurement and system replacement applications. The S28AWF maintains active product status, ensuring long-term availability and supply chain continuity. The substitute part carries ROHS3 compliance certification, meeting current environmental and regulatory standards. The S28AWF provides an extended operating temperature range (-30°C to 70°C versus -10°C to 70°C), offering improved performance in lower-temperature environments. The S28AWF includes IP67 ingress protection rating, providing enhanced environmental sealing compared to the original part specification. All electrical, mechanical, and interface parameters remain identical, ensuring direct compatibility in existing panel mount applications without design modification.

Frequently Asked Questions (FAQ)

Q: Can the S28AWF be used as a direct replacement for the S338F/U in existing applications?

A: Yes. The S28AWF is electrically and mechanically equivalent to the S338F/U. Both parts feature identical DPDT circuitry, Mom-Off-Mom switching function, 15A AC at 125V and 20A DC at 30V ratings, panel mount configuration, M12 x 1 bushing thread, 12.50mm circular panel cutout, and 0.250" quick connect termination. No design modification is required.

Q: What are the key differences between the S338F/U and S28AWF?

A: The S28AWF offers three enhancements: extended operating temperature range (-30°C to 70°C versus -10°C to 70°C), IP67 ingress protection rating for dust and water resistance, and ROHS3 compliance certification. The S28AWF is also an active product, whereas the S338F/U is obsolete.

Q: Are there any compatibility concerns with panel cutout dimensions or mounting hardware?

A: No. Both parts share identical panel interface specifications: 12.50mm diameter circular cutout and M12 x 1 bushing thread. Existing panel installations require no modification.

Q: Does the S28AWF maintain the same electrical life rating?

A: Yes. Both parts are rated for 25,000 electrical cycles, ensuring equivalent operational longevity.

Q: What is the significance of the IP67 rating on the S28AWF?

A: IP67 certification indicates the S28AWF is dust tight and waterproof, providing enhanced environmental protection compared to the unspecified ingress protection of the S338F/U. This is beneficial in applications exposed to moisture or particulate contamination.

Q: Is ROHS3 compliance relevant for my application?

A: ROHS3 compliance indicates the S28AWF meets current European environmental directives restricting hazardous substances. This is mandatory for products sold in EU markets and increasingly required by OEMs globally. The S338F/U compliance status is not specified.