Littelfuse 0473003.MRT1L Board Mount Fuse - Equivalent & Substitute Parts

Part Overview

The Littelfuse 0473003.MRT1L is a 3 A, 125 V AC/DC board mount fuse with axial through-hole mounting. This slow-blow fuse is part of the PICO® II 473 series and is designed for circuit protection in applications requiring reliable overcurrent protection with controlled response characteristics. The part maintains active product status with full compliance to CSA, PSE, and UR approval agencies. Substitute parts are identified based on identical electrical ratings, mechanical dimensions, and performance characteristics to ensure direct interchangeability in circuit designs.

Substiute Parts

0473003.MRT1L

Littelfuse Inc.In Stock: 24630473003.MRT1L Datasheet

Current PartRFQ

0473003.MAT1L

Littelfuse Inc.In Stock: 18940473003.MAT1L Datasheet

Parametric EquivalentRFQ

0473003.YRT1L

LittelfuseIn Stock: 201860473003.YRT1L Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 0473003.MRT1L are identified as parametric equivalents based on the following critical electrical and mechanical parameters:

• Current Rating: 3 A (exact match required)
• Voltage Rating: 125 V AC / 125 V DC (exact match required)
• Response Time: Slow Blow (exact match required)
• Mounting Type: Through Hole (exact match required)
• Package / Case: Axial (exact match required)
• Physical Dimensions: 0.135" Dia x 0.280" L (exact match required)
• Breaking Capacity: 50 A (exact match required)
• Melting I²t: 21 (exact match required)
• DC Cold Resistance: 0.038 Ohms (exact match required)
• Operating Temperature Range: -55°C ~ 125°C (exact match required)
• Approval Agencies: CSA, PSE, UR (exact match required)
• RoHS Compliance: ROHS3 Compliant (exact match required)

All identified substitute parts maintain identical electrical performance, thermal characteristics, and regulatory compliance. Substitution is valid only when all parameters match exactly.

Parameter Comparison

Engineering Selection Recommendations

All three parts—0473003.MRT1L, 0473003.MAT1L, and 0473003.YRT1L—are direct parametric equivalents with identical electrical ratings, mechanical dimensions, and regulatory compliance. Selection between these parts may be based on:

• Product availability and inventory status
• Lead time requirements
• Packaging format (all supplied in Cut Tape)
• Organizational procurement preferences

All parts maintain active product status and full compliance with CSA, PSE, and UR approval agencies. ROHS3 compliance and REACH unaffected status are consistent across all options. No technical differentiation exists between these parts for circuit protection applications.

Frequently Asked Questions (FAQ)

Q: Can 0473003.MAT1L or 0473003.YRT1L be used as direct replacements for 0473003.MRT1L?

A: Yes. Both parts are parametric equivalents with identical current ratings (3 A), voltage ratings (125 V AC/DC), response time (Slow Blow), physical dimensions (0.135" Dia x 0.280" L), and all electrical characteristics. Direct substitution is valid in all applications.

Q: What determines if a fuse can substitute for the 0473003.MRT1L?

A: Substitution requires exact matching of current rating, voltage rating (AC and DC), response time, mounting type, package style, physical dimensions, breaking capacity, melting I²t, DC cold resistance, operating temperature range, and regulatory approvals. Any deviation in these parameters disqualifies a part from substitution.

Q: Are there differences in the packaging between these three parts?

A: All three parts are supplied in Cut Tape (CT) packaging. No packaging differences exist between 0473003.MRT1L, 0473003.MAT1L, and 0473003.YRT1L.

Q: Do all substitute parts have the same regulatory approvals?

A: Yes. All three parts carry identical approvals from CSA, PSE, and UR agencies and maintain ROHS3 compliance with REACH unaffected status.

Q: What is the operating temperature range for these fuses?

A: The operating temperature range for all three parts is -55°C to 125°C, ensuring performance across industrial and commercial temperature environments.

Q: Can these fuses be used in both AC and DC circuits?

A: Yes. All three parts are rated for 125 V AC and 125 V DC operation, enabling use in both alternating and direct current applications.