Molex 0382110321 Equivalent & Substitute Parts

Part Overview

The Molex 0382110321 is a 21-circuit barrier block connector featuring a 0.563" (14.30mm) pitch with dual-wall barrier construction and captive plate screws. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system maintenance and new design implementations where legacy specifications must be maintained or adapted.

Substiute Parts

0382110321

MolexIn Stock: 10170382110321 Datasheet

Current PartRFQ

TB300-21

Eaton - Bussmann Electrical DivisionIn Stock: 971TB300-21 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

The Eaton Bussmann TB300-21 qualifies as a functional substitute based on the following critical parameters:

Matching Parameters:

• Number of circuits: 21
• Pitch tolerance: 0.562" (14.27mm) versus 0.563" (14.30mm) — within mechanical compatibility range for barrier block connectors
• Number of rows: 2
• Current rating: 30A
• Barrier type: 2 Wall (Dual)
• Terminal block type: Barrier Block
• Flange feature: Present
• Color: Black
• Mounting type: Chassis, Panel
• Flammability rating: UL94 V-0
• ECCN/HTSUS classification: Identical

Differing Parameters:

• Voltage rating: 300V (Molex) versus 600V (Eaton) — substitute exceeds requirement
• Wire gauge: 10-18 AWG (Molex) versus 8-22 AWG (Eaton) — substitute accommodates broader range
• Top termination: Screws with Captive Plate (Molex) versus Screws (Eaton) — functional equivalence with minor mechanical difference
• Operating temperature: 150°C (Molex) versus -40°C to 130°C (Eaton) — substitute has lower maximum rating
• Insulation material: Phenol Formaldehyde (Molex) versus Thermoplastic (Eaton) — different chemistry, equivalent performance class
• Product status: Obsolete (Molex) versus Active (Eaton) — substitute is currently manufactured

Parameter Comparison

Engineering Selection Recommendations

The Eaton Bussmann TB300-21 is an active production substitute for the obsolete Molex 0382110321. Selection of the substitute is appropriate when:

• Circuit count and pitch requirements match the 21-circuit, 0.562" configuration
• Operating voltage does not exceed 300V (the substitute's 600V rating provides margin)
• Wire gauge requirements fall within the 8-22 AWG range
• Operating temperature remains below 130°C maximum
• RoHS compliance is required (both parts meet applicable standards)
• Dual-wall barrier construction and flange mounting are functional requirements

The substitute maintains electrical and mechanical compatibility for standard barrier block applications. The minor pitch difference (0.03mm) is within tolerance for mechanical fit in standard mounting configurations. The substitute's higher voltage rating and broader wire gauge acceptance provide design flexibility without compromising performance in the original application envelope.

Frequently Asked Questions (FAQ)

Q: Can the Eaton TB300-21 directly replace the Molex 0382110321 in existing installations?

A: Mechanical and electrical compatibility is established for applications operating at or below 300V with wire gauges between 10-18 AWG. The 0.01mm pitch difference is negligible for standard mounting. Physical verification of mounting hole alignment is recommended prior to installation.

Q: What is the significance of the pitch difference (0.563" versus 0.562")?

A: The 0.03mm difference represents standard manufacturing tolerance for barrier block connectors. This variance does not affect functional compatibility or mounting in standard chassis and panel configurations.

Q: Does the substitute support the same current rating?

A: Yes. Both parts are rated for 30A continuous current. The substitute's 600V voltage rating exceeds the original 300V specification, providing additional safety margin.

Q: Are there temperature limitations when using the substitute?

A: The Eaton TB300-21 operates from -40°C to 130°C. Applications requiring sustained operation above 130°C are outside the substitute's rated envelope. The original Molex part was rated to 150°C.

Q: What wire gauges are compatible with the substitute?

A: The Eaton TB300-21 accepts 8-22 AWG wire. The original Molex part specification was 10-18 AWG. The substitute accommodates both the original range and additional gauges (8-9 AWG and 19-22 AWG).

Q: How do the insulation materials compare?

A: The Molex uses phenol formaldehyde (phenolic) insulation; the Eaton uses thermoplastic. Both achieve UL94 V-0 flammability rating. Material selection does not affect electrical performance for standard barrier block applications.

Q: Is the captive plate screw difference significant?

A: The Molex features captive plate screws; the Eaton uses standard screws. Both provide equivalent mechanical termination. The captive plate design in the original part prevents screw loss during assembly; the substitute requires standard assembly procedures.

Q: Are both parts RoHS compliant?

A: Yes. The Molex 0382110321 is ROHS3 compliant. The Eaton TB300-21 is RoHS compliant. Both meet applicable environmental standards.