Equivalent & Substitute Parts for 2121A3 Neon Panel Indicator

Part Overview

The 2121A3 is a neon panel indicator manufactured by Visual Communications Company (VCC), designed for AC applications in the 208V to 250V range. This component features an amber neon lamp with wire leads measuring 4.6 inches (116.84mm) and a round panel cutout of 0.31 inches (7.87mm) diameter.

The 2121A3 carries an Obsolete product status. Locating equivalent or substitute components is necessary for maintenance, repair, and legacy system support where original stock is depleted or unavailable from primary sources.

Substiute Parts

2121A3

Visual Communications Company - VCCIn Stock: 8102121A3 Datasheet

Current PartRFQ

2151A3

Visual Communications Company - VCCIn Stock: 12582151A3 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 2121A3 is determined by the following critical parameters:

Electrical Compatibility:

• Voltage rating: 208V ~ 250V AC
• Lamp type: Neon
• Lamp color: Amber

Mechanical Compatibility:

• Panel cutout shape: Round
• Panel cutout dimensions: 0.31" (7.87mm)
• Lens style: Round with Flat Top
• Termination style: Wire Leads - 4.6" (116.84mm)

Regulatory Compliance:

• RoHS3 Compliant status
• Moisture Sensitivity Level 1

The substitute part 2151A3 meets all critical electrical and mechanical parameters. The primary distinction is the lens transparency specification (Clear lens on 2151A3 versus unspecified on 2121A3) and product status classification.

Parameter Comparison

Engineering Selection Recommendations

The 2151A3 serves as a direct electrical and mechanical substitute for the 2121A3 based on matching voltage ratings, neon lamp type, amber color, panel cutout specifications, and wire lead termination.

Both components maintain ROHS3 compliance and identical Moisture Sensitivity Level ratings, ensuring regulatory and environmental compatibility in legacy system applications.

The 2151A3 carries a "Not For New Designs" status, indicating it remains available for replacement and maintenance purposes but is not recommended for new product development. The 2121A3's "Obsolete" classification makes the 2151A3 the appropriate selection for field replacement and system restoration.

Inventory availability differs between the two parts: 2121A3 has 747 pieces in stock, while 2151A3 has 1248 pieces available, providing greater supply security for ongoing maintenance requirements.

Frequently Asked Questions (FAQ)

Q: Can the 2151A3 directly replace the 2121A3 in existing installations?

A: Yes. Both components share identical electrical ratings (208V ~ 250V AC), neon lamp type, amber color, and mechanical specifications including panel cutout dimensions (0.31" round) and wire lead termination (4.6" length). Direct substitution is electrically and mechanically compatible.

Q: What is the difference between the 2121A3 and 2151A3?

A: The primary documented difference is lens transparency: the 2151A3 specifies a Clear lens, while the 2121A3 lens transparency is not specified in available data. Both maintain identical voltage ratings, lamp color, panel cutout shape and dimensions, and termination style. Product status differs: 2121A3 is Obsolete; 2151A3 is Not For New Designs.

Q: Are both parts RoHS compliant?

A: Yes. Both the 2121A3 and 2151A3 are ROHS3 Compliant and carry Moisture Sensitivity Level 1 (Unlimited), meeting current environmental and regulatory requirements.

Q: Which part should be selected for a replacement application?

A: The 2151A3 is the appropriate selection for replacement applications. While the 2121A3 is Obsolete, the 2151A3 maintains equivalent functionality with greater inventory availability (1248 pieces versus 747 pieces) and is designated for maintenance and repair use.

Q: Do the wire lead lengths match between both parts?

A: Yes. Both the 2121A3 and 2151A3 feature identical wire lead termination of 4.6 inches (116.84mm), ensuring compatibility with existing wiring and panel mounting configurations.