NKK Switches S331/C Toggle Switch DPST 25A 125V Equivalent & Substitute Parts

Part Overview

The NKK Switches S331/C is a panel-mounted toggle switch with DPST (Double Pole Single Throw) circuit configuration, rated for 25A at 125V AC and 30V DC. This component is classified as Last Time Buy, indicating discontinued production status. The S331/C features a standard round actuator with solder lug termination and operates across a temperature range of -10°C to 70°C. Due to its Last Time Buy status, identifying equivalent substitute parts is essential for ongoing system maintenance and new design implementations.

Substiute Parts

S331/C

NKK SwitchesIn Stock: 1012S331/C Datasheet

Current PartRFQ

S331/CUL

NKK SwitchesIn Stock: 862S331/CUL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the S331/C is determined by strict equivalence across the following critical parameters:

Mechanical Compatibility: Panel mount configuration, circular 12.50mm diameter cutout, M12 x 1 bushing thread, standard round actuator with 17.50mm length, and solder lug termination must remain unchanged to ensure direct replacement without mechanical redesign.

Electrical Compatibility: DPST circuit configuration and switch function (On-Off) are mandatory. Voltage ratings must meet or exceed the original specification: 125V AC minimum and 30V DC minimum. Current rating must support the application requirements.

Environmental & Compliance: Operating temperature range of -10°C to 70°C and electrical life of 15,000 cycles establish the baseline performance envelope. RoHS3 compliance and REACH unaffected status ensure regulatory alignment.

The S331/CUL qualifies as a direct substitute based on these parameters, with the exception of current rating, which is specified at 20A rather than 25A. This represents a derating condition that may be acceptable depending on application load requirements.

Parameter Comparison

Engineering Selection Recommendations

The S331/CUL is the manufacturer-recommended substitute for the discontinued S331/C. Both components are manufactured by NKK Switches and share identical mechanical interfaces and electrical circuit topology. The S331/CUL maintains Active product status, ensuring continued availability and supply chain stability.

The primary distinction is the current rating specification: S331/CUL is rated at 20A versus the original 25A rating. This derating is acceptable for applications where the maximum load current does not exceed 20A. For applications requiring the full 25A capacity, alternative components from the NKK Switches portfolio or other manufacturers with equivalent DPST panel-mount toggle switches rated for 25A at 125V AC must be evaluated.

Both components comply with RoHS3 requirements and maintain the same operating temperature envelope and electrical life cycle rating, supporting direct substitution in compliant applications.

Frequently Asked Questions (FAQ)

Q: Can the S331/CUL directly replace the S331/C without mechanical modification?

A: Yes. Both components feature identical panel mount configurations with 12.50mm circular cutout, M12 x 1 bushing thread, standard round 17.50mm actuator, and solder lug termination. No mechanical redesign is required.

Q: What is the impact of the 20A current rating on the S331/CUL versus the 25A rating of the S331/C?

A: The S331/CUL is rated for 20A maximum continuous current. Applications operating at currents between 20A and 25A will exceed the substitute component's rating. Load analysis is required to determine compatibility.

Q: Are voltage and temperature specifications identical between the two parts?

A: Yes. Both components are rated for 125V AC and 30V DC, with identical operating temperature ranges of -10°C to 70°C and electrical life of 15,000 cycles.

Q: Why is the S331/C classified as Last Time Buy?

A: Last Time Buy status indicates the manufacturer has discontinued production. The S331/CUL represents the active replacement in the NKK Switches product line.

Q: Are there compliance differences between S331/C and S331/CUL?

A: Both components are ROHS3 compliant. The S331/CUL maintains equivalent regulatory status for applications requiring RoHS certification.

Q: What is the difference between the S300 series designation and the S series designation?

A: The S331/C belongs to the S300 series, while the S331/CUL belongs to the broader S series. This reflects product line evolution; however, both maintain identical electrical and mechanical specifications for the toggle switch function.