551840 Equivalent & Substitute Parts Reference

Part Overview

The Littelfuse/Commercial Vehicle Products 551840 is a toggle switch designed for panel mounting, featuring a Single Pole Single Throw (SPST) circuit configuration rated for 15A at 24V DC. The actuator is a standard round style with a length of 26.92mm. This switch is RoHS3 compliant and classified as obsolete. Finding equivalent or substitute parts is necessary to ensure design continuity, maintain repairability, and address inventory shortages due to the product's obsolete status.

Substiute Parts

551840

Littelfuse/Commercial Vehicle ProductsIn Stock: 797551840 Datasheet

Current PartRFQ

5520

Littelfuse/Commercial Vehicle ProductsIn Stock: 98575520 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts are grouped strictly based on matching the following key parameters: circuit configuration (SPST), switch function (On-Off), current rating (15A DC), voltage rating (24V DC), mounting type (panel mount), actuator type (standard round), actuator length, termination style (screw terminal), panel cutout dimensions (circular - 11.90mm diameter), and bushing thread (15/32-32). Only parts fully matching these criteria are considered equivalent or substitutes.

Parameter Comparison

Engineering Selection Recommendations

The 551840 toggle switch is classified as obsolete, while the direct substitute 5520 is active. Both parts are RoHS3 compliant, classified as MSL 1 (unlimited), and have unaffected REACH status. Selecting the 5520 ensures ongoing product compliance and supply chain consistency with current environmental and material regulations.

Frequently Asked Questions (FAQ)

Q1: What key parameters must match for a substitute to be used for 551840?
A1: Circuit configuration, switch function, current and voltage rating, mounting type, actuator type, actuator length, termination style, panel cutout dimensions, and bushing thread.

Q2: Are there compliance differences between the 551840 and 5520 toggle switches?
A2: Both the 551840 and 5520 are RoHS3 compliant, MSL 1 (unlimited), and REACH unaffected.

Q3: Does the actuator length differ between the 551840 and 5520?
A3: The 551840 has a 26.92mm actuator, while the 5520 has a 17.53mm actuator.

Q4: Is the panel cutout dimension the same for 551840 and 5520?
A4: Both parts require a circular panel cutout with an 11.90mm diameter.

Q5: Is the substitute part 5520 available in the same mounting style?
A5: Both the 551840 and 5520 use panel mounting.

Q6: How does the product status affect part selection?
A6: The 551840 is obsolete. Selecting an active part such as the 5520 ensures ongoing availability.