A028306 Equivalent & Substitute Parts Reference

Part Overview

The A028306 is a 22MM configurable switch body with keylock actuator manufactured by APEM Inc. as part of the A02 series. This non-illuminated, momentary-action component is designed for industrial control applications requiring key-selectable operation. The product is classified as obsolete, necessitating identification of active equivalent components to maintain supply chain continuity and support ongoing system maintenance and new installations.

Substiute Parts

A028306

APEM Inc.In Stock: 1094A028306 Datasheet

Current PartRFQ

LBW6K-33D

IDECIn Stock: 858LBW6K-33D Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the A028306 is determined by the following critical parameters that must remain consistent:

• Panel Cutout Dimensions: 22mm round cutout (tolerance: ±0.3mm acceptable for mechanical fit)
• Actuator Type: Keylock mechanism for key-selectable operation
• Action Type: Momentary switching function
• Illumination: Non-illuminated configuration
• Electrical Function: Requires external contact blocks for electrical switching
• Compliance: ROHS3 compliance and EAR99 classification maintained

The LBW6K-33D from IDEC meets these substitution criteria as an active product with compatible mechanical and electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

The LBW6K-33D serves as a direct functional equivalent for the obsolete A028306. Selection is based on:

• Product Status: The LBW6K-33D maintains active production status, ensuring long-term availability and supply chain reliability.
• Regulatory Compliance: Both components maintain ROHS3 compliance and EAR99 classification, satisfying regulatory requirements for industrial control applications.
• Mechanical Compatibility: Panel cutout dimensions are within standard mechanical tolerance ranges for 22mm round switch installations.
• Electrical Equivalence: Identical momentary keylock operation with external contact block configuration ensures functional interchangeability in control circuits.
• Environmental Rating: Both components share MSL 1 (Unlimited) moisture sensitivity classification, suitable for standard industrial environments.

Frequently Asked Questions (FAQ)

Q: Can the LBW6K-33D directly replace the A028306 in existing installations?

A: Yes. The LBW6K-33D is mechanically and electrically compatible. The 22.3mm panel cutout dimension accommodates standard 22mm round openings within normal manufacturing tolerances. Both components require identical external contact blocks and operate with the same momentary keylock switching function.

Q: Are there differences in contact block compatibility?

A: Both the A028306 and LBW6K-33D require external contact blocks for electrical operation. Contact block selection is independent of the switch body manufacturer and is determined by the specific electrical requirements of the application (voltage, current, contact configuration).

Q: What is the significance of the panel cutout dimension difference (22mm vs. 22.3mm)?

A: The 0.3mm difference falls within standard mechanical tolerance for panel-mounted switch installations. This variation is typical across manufacturers and does not affect functional compatibility or mechanical fit in standard applications.

Q: Do both components meet the same regulatory standards?

A: Yes. Both the A028306 and LBW6K-33D are ROHS3 compliant and classified as EAR99 for export control purposes. Both maintain MSL 1 (Unlimited) moisture sensitivity ratings suitable for industrial control environments.

Q: Why is the A028306 listed as obsolete?

A: Obsolescence indicates that APEM Inc. has discontinued production of this component. The LBW6K-33D from IDEC provides functional continuity for applications currently using the A028306 and supports new designs requiring equivalent keylock switch functionality.