SB25/U Equivalent & Substitute Parts

Part Overview

The SB25/U is a pushbutton switch manufactured by NKK Switches, classified as a DPDT (Double Pole Double Throw) standard panel mount switch rated for 15A at 125V AC. This component features a rear-mounted circular button actuator with solder lug termination and is designed for on-on switching applications. The product is currently obsolete, making identification of functionally equivalent alternatives necessary for system maintenance, repair, and legacy equipment support.

Substiute Parts

SB25/U

NKK SwitchesIn Stock: 1158SB25/U Datasheet

Current PartRFQ

JPL26B/U

NKK SwitchesIn Stock: 853JPL26B/U Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SB25/U is determined by the following critical parameters:

• Electrical Compatibility: Voltage rating (125V AC minimum), current capacity (15A minimum), and circuit configuration (DPDT preferred for direct replacement)
• Mechanical Compatibility: Panel mount configuration, solder lug termination, and operating temperature range (-10°C to 70°C)
• Regulatory Compliance: RoHS3 compliance and REACH unaffected status

The JPL26B/U meets the core electrical and mechanical requirements with the following considerations: it maintains 125V AC voltage rating and solder lug termination, exceeds the current rating at 16A AC, and operates within the specified temperature range. However, the JPL26B/U differs in circuit configuration (DPST vs. DPDT) and mounting style (snap-in vs. rear mount), which may require circuit redesign or mechanical adaptation depending on application requirements.

Parameter Comparison

Engineering Selection Recommendations

The JPL26B/U is available as an active product from NKK Switches and maintains compliance with ROHS3 and REACH requirements. Selection of this substitute requires verification that the application can accommodate the following differences:

• Circuit Configuration Change: The shift from DPDT to DPST reduces the number of poles from two to one. Applications requiring simultaneous control of two independent circuits must be redesigned or supplemented with additional switching components.
• Switch Function Change: The JPL26B/U operates as Off-On rather than On-On. This affects the default state behavior and may require circuit logic modification.
• Mounting Mechanism: The snap-in mounting of JPL26B/U differs from the rear-mount design of SB25/U. Panel cutout dimensions differ (rectangular 28.00mm × 21.20mm vs. circular 12.50mm diameter), requiring mechanical panel modification.
• Current and Voltage Ratings: The JPL26B/U exceeds both current (16A vs. 15A) and maintains voltage (125V) specifications, providing adequate electrical headroom.

Frequently Asked Questions (FAQ)

Q: Can JPL26B/U directly replace SB25/U without circuit modification?

A: No. The JPL26B/U differs in circuit configuration (DPST vs. DPDT), switch function (Off-On vs. On-On), and mounting type (snap-in vs. rear). Direct mechanical and electrical substitution is not possible without redesign.

Q: What is the primary difference between DPDT and DPST configurations?

A: DPDT (Double Pole Double Throw) provides two independent switching poles, each capable of connecting to two positions. DPST (Double Pole Single Throw) provides two poles that switch between one position and another. Applications requiring simultaneous control of two separate circuits cannot use DPST as a direct replacement for DPDT.

Q: Are both parts rated for the same voltage and current?

A: Both are rated for 125V AC. The JPL26B/U is rated for 16A AC, which exceeds the SB25/U rating of 15A AC. This provides additional current capacity margin.

Q: What are the panel cutout dimension differences?

A: SB25/U requires a circular cutout of 12.50mm diameter. JPL26B/U requires a rectangular cutout of 28.00mm × 21.20mm. Existing panel holes for SB25/U cannot accommodate JPL26B/U without mechanical modification.

Q: Do both parts meet current compliance standards?

A: Yes. Both SB25/U and JPL26B/U are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component use.

Q: What is the difference between On-On and Off-On switch functions?

A: On-On switches maintain an active connection in both positions, allowing selection between two states. Off-On switches connect in one position and disconnect in the other. This affects circuit behavior and default power states.