Dialight 5541221111 Equivalent & Substitute Parts

Part Overview

The Dialight 5541221111 is a DPDT pushbutton switch rated for 7A at 125V AC with illuminated panel mount snap-in configuration. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing system maintenance and new design implementations. The switch features a plunger actuator with momentary on-off function and solder/quick connect termination suitable for standard control panel applications.

Substiute Parts

5541221111

DialightIn Stock: 11245541221111 Datasheet

Current PartRFQ

UB25KKW015D

NKK SwitchesIn Stock: 27085UB25KKW015D Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the Dialight 5541221111 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Circuit configuration: DPDT (Double Pole Double Throw)
• Switch function: On-Mom (Momentary operation)
• Mounting type: Panel Mount, Snap-In
• Actuator type: Plunger for Cap
• Voltage rating: Minimum 125V AC / 30V DC
• Current rating: Minimum 7A (AC/DC)
• Panel cutout dimensions: Square 16.26mm x 16.26mm (±0.06mm tolerance acceptable)
• Termination compatibility: Solder or Quick Connect 0.110" (2.8mm)

The NKK Switches UB25KKW015D qualifies as a functional substitute based on matching circuit topology, mounting configuration, voltage ratings, and panel cutout dimensions. The substitute part operates within the same electrical envelope and mechanical interface requirements.

Parameter Comparison

Engineering Selection Recommendations

The NKK Switches UB25KKW015D serves as a functional equivalent for applications where the Dialight 5541221111 is no longer available. Selection should be based on the following factors:

Current Rating Consideration: The substitute part is rated for 5A versus the original 7A specification. Applications operating at or below 5A (AC/DC) present no derating concern. Applications requiring the full 7A capacity require evaluation of actual circuit load conditions.

Compliance Status: The substitute part achieves ROHS3 compliance and REACH unaffected status, meeting current regulatory requirements. The original part is RoHS non-compliant, making the substitute preferable for new designs and systems subject to environmental regulations.

Mechanical Interface: Panel cutout dimensions differ by 0.06mm (16.26mm versus 16.20mm), which falls within standard mechanical tolerance for snap-in panel mount applications. Existing panel cutouts designed for the original part accommodate the substitute without modification.

Termination Compatibility: Both parts support solder termination. The substitute provides solder lug termination, compatible with standard PCB assembly processes. Quick connect capability of the original is not replicated in the substitute; applications requiring quick disconnect functionality require alternative evaluation.

Product Availability: The substitute part maintains active manufacturing status with 27,000 units in stock, ensuring supply chain continuity compared to the obsolete original.

Frequently Asked Questions (FAQ)

Q: Can the NKK Switches UB25KKW015D directly replace the Dialight 5541221111 in existing assemblies?

A: Direct mechanical and electrical replacement is possible for applications operating at 5A or below. The panel cutout dimension variance of 0.06mm is within standard tolerance for snap-in mounting. Solder termination compatibility is confirmed. Applications requiring the full 7A rating require load analysis to determine if derating to 5A is acceptable.

Q: What is the impact of the current rating difference (7A versus 5A)?

A: The substitute part is rated for 5A maximum continuous current. If the application circuit draws 5A or less, no derating occurs. If the original design requires 7A capacity, the substitute part must not be used without circuit redesign or load reduction verification.

Q: Are there termination compatibility issues between the two parts?

A: The original part offers both solder and quick connect 0.110" (2.8mm) termination options. The substitute provides solder lug termination only. Applications using quick connect interfaces require alternative component selection or interface adapter evaluation.

Q: Does the panel cutout dimension difference affect installation?

A: The 0.06mm difference (16.26mm original versus 16.20mm substitute) is negligible for standard panel cutout tolerances. Existing panel openings designed for the original part accommodate the substitute without modification.

Q: What compliance advantages does the substitute part provide?

A: The NKK Switches UB25KKW015D achieves ROHS3 compliance and maintains REACH unaffected status. The original Dialight part is RoHS non-compliant. For systems subject to environmental or regulatory compliance requirements, the substitute meets current standards.

Q: Is the mechanical life specification comparable between the two parts?

A: The original part does not specify mechanical life. The substitute part is rated for 1,000,000 cycles mechanical life and 10,000 cycles electrical life, providing documented reliability data for design validation.