MARR-5-32-38 Equivalent & Substitute Parts

Part Overview

The MARR-5-32-38 is a glass body reed switch manufactured by Littelfuse, configured as a SPST-NO (Single Pole Single Throw - Normally Open) device. This component is rated for 350mA AC / 500mA DC switching at 265V AC and 1000V DC, with a 10W power rating and 32–38AT operate range. The part is currently obsolete, making identification of compatible substitutes essential for ongoing system maintenance and new design implementations.

Substiute Parts

MARR-5-32-38

LittelfuseIn Stock: 1064MARR-5-32-38 Datasheet

Current PartRFQ

MVSR-20-32-38

Littelfuse Inc.In Stock: 2393MVSR-20-32-38 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MARR-5-32-38 is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: SPST-NO (identical switching topology required)
• Operate Range: 32–38AT (magnetic actuation threshold must match)
• Current Rating: 350mA AC / 500mA DC (switching capacity must be equal or greater)
• Voltage Rating: 265V AC / 1000V DC (dielectric strength must be equal or greater)
• Power Rating: 10W (thermal dissipation capacity must be equal or greater)
• Mounting and Termination: Through Hole with Axial termination (physical compatibility)
• Operating Temperature: −75°C to 125°C (thermal operating envelope)
• Package Type: Glass Body Reed (form factor and construction method)

The MVSR-20-32-38 meets all substitution criteria and is classified as a direct equivalent.

Parameter Comparison

Engineering Selection Recommendations

The MVSR-20-32-38 is the direct equivalent substitute for the obsolete MARR-5-32-38. Both components are manufactured by Littelfuse and share identical electrical, mechanical, and thermal specifications. The MVSR-20-32-38 carries Active product status with current manufacturing support and availability (2327 pcs in stock), whereas the MARR-5-32-38 is obsolete.

Both parts maintain ROHS3 compliance and carry identical export classifications (EAR99, HTSUS 8536.50.9065). The MVSR-20-32-38 includes REACH Unaffected status documentation. No electrical or mechanical redesign is required for substitution; the parts are pin-compatible and functionally interchangeable in all applications where the MARR-5-32-38 was originally specified.

Frequently Asked Questions (FAQ)

Q: Can the MVSR-20-32-38 be used as a direct replacement for the MARR-5-32-38?

A: Yes. The MVSR-20-32-38 is a direct equivalent. All electrical parameters (current, voltage, power rating, operate range), mechanical dimensions, mounting configuration, and operating temperature range are identical. No circuit modifications or board redesign is required.

Q: What is the primary reason for substitution?

A: The MARR-5-32-38 is obsolete and no longer manufactured. The MVSR-20-32-38 is an active product with current manufacturing support and inventory availability.

Q: Are the physical dimensions identical?

A: Yes. Both components have identical overall length (2.235" / 56.77mm), body diameter (0.105" / 2.66mm), and body length (0.775" / 19.69mm). Both use Through Hole mounting with Axial termination.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the MARR-5-32-38 and MVSR-20-32-38 are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating. Both carry identical export classifications.

Q: What is the operate range specification, and does it differ between the two parts?

A: The operate range for both parts is 32–38AT (Ampere-Turns). This specification defines the magnetic actuation threshold and is identical across both components.

Q: Are there any packaging differences?

A: The MVSR-20-32-38 is supplied in Box packaging. Verify packaging requirements for your procurement process.