RTAC31W12M25NS Equivalent & Substitute Parts

Part Overview

The RTAC31W12M25NS is a 12-position rotary switch manufactured by C&K, featuring a single-pole, 12-throw (SP12T) configuration with non-shorting contact timing. This panel-mount component is rated for 150mA at 60V AC/DC and utilizes a slotted round actuator with continuous index stops. The product is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

RTAC31W12M25NS

C&KIn Stock: 910RTAC31W12M25NS Datasheet

Current PartRFQ

A11242MNZQ

C&KIn Stock: 861A11242MNZQ Datasheet

SimilarRFQ

RTAP31W12M25NS

C&KIn Stock: 1077RTAP31W12M25NS Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RTAC31W12M25NS is determined by the following critical parameters:

Primary Compatibility Criteria:

• Circuit configuration must be SP12T (12-position, single-pole, single-throw per position)
• Contact timing must be non-shorting (BBM)
• Mounting type must be panel mount
• Panel cutout diameter must be compatible (10.20mm or 10.21mm)
• Actuator diameter must be 6mm

Electrical Compatibility Criteria:

• Current rating must equal or exceed 150mA
• Voltage rating must equal or exceed 60V AC and 60V DC
• Contact material and finish must support the electrical requirements

Mechanical Compatibility Criteria:

• Angle of throw must be 30°
• Number of decks must be 1
• Number of poles per deck must be 1

Two substitute parts meet these criteria with varying degrees of parameter alignment and product status differences.

Parameter Comparison

Engineering Selection Recommendations

RTAP31W12M25NS is the primary substitute for RTAC31W12M25NS. Both components share identical electrical ratings (150mA, 60V AC/DC), matching actuator specifications (6mm slotted, 25mm length), and continuous index stop operation. The primary difference is termination style: RTAP31W12M25NS uses PC pins for through-hole mounting versus solder lugs on the original. This component is active in production with ROHS3 compliance and REACH unaffected status, ensuring long-term availability and regulatory alignment.

A11242MNZQ is a secondary substitute suitable only for applications where higher electrical ratings are acceptable. This component provides significantly higher current capacity (2.5A AC, 350mA DC) and voltage rating (125V AC/DC), making it compatible with the original's electrical requirements but exceeding them. The actuator length differs (42mm versus 25mm), and index stops are fixed rather than continuous. This component is active in production with ROHS3 compliance. Selection of A11242MNZQ requires confirmation that the increased actuator length and fixed index stops do not conflict with mechanical constraints or functional requirements.

Frequently Asked Questions (FAQ)

Q: Can RTAP31W12M25NS directly replace RTAC31W12M25NS without circuit modification?

A: RTAP31W12M25NS is electrically and functionally equivalent. The primary difference is termination style: PC pins (through-hole) versus solder lugs (panel-mount). Circuit board layout and mounting method must accommodate the through-hole termination. If the original design uses solder lug connections, adapter hardware or circuit redesign may be required.

Q: What is the significance of "continuous" versus "fixed" index stops?

A: Continuous index stops allow the actuator to rotate smoothly between positions without detent resistance. Fixed index stops provide tactile detent positions. RTAC31W12M25NS and RTAP31W12M25NS both feature continuous stops. A11242MNZQ features fixed stops, which may alter user interaction and mechanical feel in the application.

Q: Is A11242MNZQ suitable for direct substitution?

A: A11242MNZQ meets all electrical compatibility requirements with higher ratings. However, the 42mm actuator length (versus 25mm original) may exceed available panel depth. Verify that the application's mechanical envelope accommodates the increased actuator length and that fixed index stops are functionally acceptable.

Q: What are the compliance implications of selecting an active product over an obsolete part?

A: RTAP31W12M25NS and A11242MNZQ are both active products with ROHS3 compliance and current manufacturing support. Selecting an active substitute ensures ongoing availability, regulatory compliance with current standards, and access to manufacturer technical support. The obsolete status of RTAC31W12M25NS indicates discontinued production and potential supply constraints.

Q: Are there termination compatibility considerations between solder lug and PC pin versions?

A: Yes. Solder lug termination (RTAC31W12M25NS) connects directly to solder pads on a panel or external wiring. PC pin termination (RTAP31W12M25NS) requires through-hole mounting on a printed circuit board. The circuit design must accommodate the appropriate termination method. Mechanical mounting location and electrical connection topology differ between these termination styles.

Q: What is the panel cutout diameter tolerance between 10.20mm and 10.21mm?

A: The 0.01mm difference is negligible for practical panel mounting. Both components are compatible with standard 10.2mm panel cutouts used in rotary switch applications. This tolerance variation reflects normal manufacturing specifications and does not affect mechanical fit or functionality.