2JQ 250-R Equivalent & Substitute Parts

Part Overview

The 2JQ 250-R is a 250 mA fast-blow glass cartridge fuse manufactured by Bel Fuse Inc., rated for 350 V AC and 140 V DC operation. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing system support and procurement. The fuse requires a 2AG holder and is housed in a 5mm x 15mm form factor. Due to its obsolete status, sourcing alternatives from active product lines is essential for system maintenance and new designs.

Substiute Parts

2JQ 250-R

Bel Fuse Inc.In Stock: 9202JQ 250-R Datasheet

Current PartRFQ

BK/C520-250-R

Eaton - Electronics DivisionIn Stock: 4308BK/C520-250-R Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2JQ 250-R is determined by the following critical parameters:

• Current Rating: 250 mA (exact match required)
• Fuse Type: Cartridge, Glass (form factor compatibility)
• Package / Case: 2AG, 5mm x 15mm (mechanical fit in existing holders)
• Response Time: Fast Blow (circuit protection characteristic)
• Voltage Rating - AC: Minimum 350 V (or lower if application permits)
• Voltage Rating - DC: Minimum 140 V (or lower if application permits)

The BK/C520-250-R from Eaton - Electronics Division meets the current rating, fuse type, package specification, and response time requirements. However, the AC voltage rating is reduced to 250 V, which represents a design trade-off. This substitute is suitable only for applications where the actual operating voltage does not exceed 250 V AC.

Parameter Comparison

Engineering Selection Recommendations

The BK/C520-250-R is an active product suitable as a substitute for the obsolete 2JQ 250-R in applications where the AC voltage requirement does not exceed 250 V. Both components share identical current ratings, fuse type, response time, and mechanical package specifications, ensuring direct physical and electrical compatibility within the specified voltage envelope.

The substitute part carries CSA and UL certifications, providing regulatory compliance for North American markets. The original part's CE and cURus certifications are not replicated in the substitute; applications requiring these specific approvals must evaluate compliance requirements independently.

The reduced breaking capacity (35A versus 100A AC) and lower melting I²t value (0.012 versus 0.014) of the substitute indicate faster response characteristics. Applications with high fault current environments should confirm that the substitute's breaking capacity is adequate for the circuit protection scheme.

Frequently Asked Questions (FAQ)

Q: Can the BK/C520-250-R be used as a direct replacement for the 2JQ 250-R in all applications?

A: No. The substitute is suitable only for applications operating at 250 V AC or lower. If your circuit operates at voltages between 250 V and 350 V AC, the substitute does not meet the voltage rating requirement.

Q: Are the physical dimensions identical between the two parts?

A: Both parts use the 2AG package format with 5mm x 15mm dimensions. Minor dimensional variations exist (0.201" vs 0.205" diameter; 0.543" vs 0.570" length), but both fit standard 2AG holders without modification.

Q: What certifications does the substitute carry?

A: The BK/C520-250-R carries CSA and UL certifications. The original 2JQ 250-R includes CE and cURus certifications. If your application requires CE or cURus approval, verify that the substitute meets your specific regulatory requirements.

Q: How do the breaking capacities compare?

A: The original part is rated for 100A AC and 150A DC breaking capacity, while the substitute is rated for 35A. In high fault-current circuits, confirm that 35A breaking capacity is sufficient for your protection scheme.

Q: Is the melting I²t value a critical difference?

A: The substitute has a lower melting I²t (0.012 versus 0.014), indicating slightly faster thermal response. This difference is minor but may affect nuisance trip behavior in circuits with high inrush currents. Evaluate based on your specific circuit characteristics.